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Journal articles on the topic 'Next-to-leading order (NLO)'

Author: Grafiati

Published: 26 October 2023

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1

CONTOGOURIS, A. P., and Z. MEREBASHVILI. "APPROXIMATE NEXT-TO-LEADING ORDER AND NEXT-TO-NEXT-TO-LEADING ORDER CORRECTIONS." International Journal of Modern Physics A 18, no. 06 (2003): 957–66. http://dx.doi.org/10.1142/s0217751x03013983.

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For processes involving structure functions and/or fragmentation functions, arguments that over a range of a proper kinematic variable, there is a part that dominates the next-to-leading order (NLO) corrections, are briefly reviewed. The arguments are tested against more recent NLO and in particular complete next-to-next-to-leading order (NNLO) calculations. A critical examination of when these arguments may not be useful is also presented.

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CHIRILLI, GIOVANNI ANTONIO. "SMALL-x EVOLUTION IN THE NEXT-TO-LEADING ORDER." Modern Physics Letters A 24, no. 35n37 (2009): 3052–61. http://dx.doi.org/10.1142/s0217732309001261.

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After a brief introduction to Deep Inelastic Scattering in the Bjorken limit and in the Regge Limit we discuss the operator product expansion in terms of non local string operator and in terms of Wilson lines. We will show how the high-energy behavior of amplitudes in gauge theories can be reformulated in terms of the evolution of Wilson-line operators. In the leading order this evolution is governed by the non-linear Balitsky-Kovchegov (BK) equation. In order to see if this equation is relevant for existing or future deep inelastic scattering (DIS) accelerators (like Electron Ion Collider (EI

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3

BALITSKY, IAN. "PHOTON IMPACT FACTOR AND kT FACTORIZATION IN THE NEXT-TO-LEADING ORDER." International Journal of Modern Physics: Conference Series 20 (January 2012): 187–99. http://dx.doi.org/10.1142/s2010194512009233.

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The photon impact factor for the BFKL pomeron is calculated in the next-to-leading order (NLO) approximation using the operator expansion in Wilson lines. The result is represented as a NLO kT-factorization formula for the structure functions of small-x deep inelastic scattering.

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Triantafyllopoulos, D. N. "Forward particle production in proton-nucleus collisions at next-to-leading order." EPJ Web of Conferences 192 (2018): 00014. http://dx.doi.org/10.1051/epjconf/201819200014.

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We consider the next-to-leading order (NLO) calculation of single inclusive particle production at forward rapidities in proton-nucleus collisions and in the framework of the Color Glass Condensate (CGC). We focus on the quark channel and the corrections associated with the impact factor. In the first step of the evolution the kinematics of the emitted gluon is kept exactly (and not in the eikonal approximation), but such a treatment which includes NLO corrections is not explicitly separated from the high energy evolution. Thus, in this newly established “factorization scheme”, there is no “ra

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Carloni Calame, Carlo M., Mauro Chiesa, Guido Montagna, Oreste Nicrosini, and Fulvio Piccinini. "Muon-electron scattering at next-to-leading order accuracy." EPJ Web of Conferences 212 (2019): 05002. http://dx.doi.org/10.1051/epjconf/201921205002.

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The next-to-leading order electro-weak radiative corrections to the µ±e- → µ±e- process are reviewed and their relevance is discussed for the MUonE experiment, proposed at CERN. The aim of MUonE is the high precision measurement of the QED running coupling constant in the space-like region, from which the full hadronic contribution can be extracted and used to provide a new and independent determination of the leading-order hadronic correction to the muon g − 2. In this context, the required accuracy demands that radiative corrections are accounted for at the highest level of precision and imp

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FIGY, TERRANCE. "NEXT-TO-LEADING ORDER QCD CORRECTIONS TO LIGHT HIGGS PAIR PRODUCTION VIA VECTOR BOSON FUSION." Modern Physics Letters A 23, no. 24 (2008): 1961–73. http://dx.doi.org/10.1142/s0217732308028181.

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We present the NLO QCD corrections for light Higgs pair production via vector boson fusion at the LHC within the CP conserving type II two-Higgs doublet model in the form of a fully flexible parton-level Monte Carlo program. Scale dependences on integrated cross sections and distributions are reduced with QCD K-factors of order unity.

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BUTENSCHOEN, MATHIAS, та BERND A. KNIEHL. "NEXT-TO-LEADING ORDER TESTS OF NON-RELATIVISTIC-QCD FACTORIZATION WITH J/ψ YIELD AND POLARIZATION". Modern Physics Letters A 28, № 09 (2013): 1350027. http://dx.doi.org/10.1142/s0217732313500272.

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We report on recent progress in testing the factorization formalism of non-relativistic quantum chromodynamics (NRQCD) at next-to-leading order (NLO) for J/ψ yield and polarization. We demonstrate that it is possible to unambiguously determine the leading color-octet (CO) long-distance matrix elements (LDMEs) in compliance with the velocity scaling rules through a global fit to experimental data of unpolarized J/ψ production in pp, [Formula: see text], ep, γγ, and e+e-collisions. Three data sets not included in the fit, from hadro-production and from photo-production in the fixed-target and co

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8

Brandenburg, A., S. Dittmaier, P. Uwer, and S. Weinzierl. "Top quark pair + jet production at next-to-leading order: NLO QCD corrections to." Nuclear Physics B - Proceedings Supplements 135 (October 2004): 71–75. http://dx.doi.org/10.1016/j.nuclphysbps.2004.09.038.

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9

Ogul, Hasan, Kamuran Dilsiz, Emrah Tiras, Ping Tan, Yasar Onel, and Jane Nachtman. "High Order QCD Predictions for Inclusive Production ofWBosons inppCollisions ats=13 TeV." Advances in High Energy Physics 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/7865689.

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Predictions of fiducial cross sections, differential cross sections, and lepton charge asymmetry are presented for the production ofW±bosons with leptonic decay up to next-to-next-to-leading order (NNLO) in perturbative QCD. Differential cross sections ofW±bosons andWboson lepton charge asymmetry are computed as a function of lepton pseudorapidity for a defined fiducial region inppcollisions ats=13 TeV. Numerical results of fiducialW±cross section predictions are presented with the latest modern PDF models at next-to-leading order (NLO) and NNLO. It is found that the CT14 and NNPDF 3.0 predict

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Gnech, Alex, Jordy de Vries, Sachin Shain, and Michele Viviani. "Electric dipole moment of light nuclei in chiral effective field theory." EPJ Web of Conferences 258 (2022): 06007. http://dx.doi.org/10.1051/epjconf/202225806007.

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CP-violating interactions at quark level generate CP-violating nuclear interactions and currents, which could be revealed by looking at the presence of a permanent nuclear electric dipole moment. Within the framework of chiral effective field theory, we discuss the derivation of the CP-violating nuclear potential up to next-to-next-to leading order (N2LO) and the preliminary results for the charge operator up to next-to leading order (NLO). Moreover, we introduce some renormalization argument which indicates that we need to promote the short-distance operator to the leading order (LO) in order

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11

Saveetha, H., D. Indumathi, and Subhadip Mitra. "Vector meson fragmentation using a model with broken SU(3) at the next-to-leading order." International Journal of Modern Physics A 29, no. 07 (2014): 1450049. http://dx.doi.org/10.1142/s0217751x14500493.

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A detailed study of fragmentation of vector mesons at the next-to-leading order (NLO) in QCD is given for e+e- scattering. A model with broken SU(3) symmetry using three input fragmentation functions α(x, Q2), β(x, Q2) and γ(x, Q2) and a strangeness suppression parameter λ describes all the light quark fragmentation functions for the entire vector meson octet. At a starting low energy scale of [Formula: see text] for three light quarks (u, d, s) along with initial parametrization, the fragmentation functions are evolved through DGLAP evolution equations at NLO and the cross-section is calculat

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BALITSKY, IAN. "HIGH-ENERGY AMPLITUDES IN ${\cal N}\, = \,4$ SYM IN THE NEXT-TO-LEADING ORDER." International Journal of Modern Physics A 25, no. 02n03 (2010): 401–10. http://dx.doi.org/10.1142/s0217751x10048706.

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The high-energy behavior of the of [Formula: see text] SYM amplitudes in the Regge limit can be calculated order by order in perturbation theory using the high-energy operator expansion in Wilson lines. At large Nc, a typical four-point amplitude is determined by a single BFKL pomeron. The conformal structure of the four-point amplitude is fixed in terms of two functions: pomeron intercept and the coefficient function in front of the pomeron (the product of two residues). The pomeron intercept is universal while the coefficient function depends on the correlator in question. The intercept is k

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13

Balitsky, I. "NLO Hierarchy of Wilson Lines Evolution." International Journal of Modern Physics: Conference Series 37 (January 2015): 1560056. http://dx.doi.org/10.1142/s2010194515600563.

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The high-energy behavior of QCD amplitudes can be described in terms of the rapidity evolution of Wilson lines. I present the hierarchy of evolution equations for Wilson lines in the next-to-leading order.

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14

Eskola, K. J., V. J. Kolhinen, P. V. Ruuskanen, and R. L. Thews. "Effects of Shadowing on Drell–Yan Dilepton Production in High Energy Nuclear Collisions." International Journal of Modern Physics E 12, no. 02 (2003): 197–209. http://dx.doi.org/10.1142/s0218301303001260.

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We compute cross sections for the Drell–Yan process in nuclear collisions at next-to-leading order (NLO) in αs. The effects of shadowing on the normalization and on the mass and rapidity dependence of these cross sections are presented. An estimate of higher order corrections is obtained from next-to-next-to-leading order (NNLO) calculation of the rapidity-integrated mass distribution. Variations in these predictions resulting from choices of parton distributions sets are discussed. Numerical results for mass distributions at NLO are presented for RHIC and LHC energies, using appropriate rapid

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15

Liu, Wen, Wen-Gan Ma, Lei Guo, Liang-Wen Chen, Chang Chen та Ren-You Zhang. "T-odd quark pair production and decay at γγ collider in the littlest Higgs model with T-parity in next-to-leading order QCD". Modern Physics Letters A 30, № 25 (2015): 1550125. http://dx.doi.org/10.1142/s0217732315501254.

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We calculate the complete next-to-leading order (NLO) QCD corrections to the [Formula: see text]-odd mirror quark pair [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] production in the littlest Higgs model with [Formula: see text]-parity (LHT) at a high energy [Formula: see text] collider. We present the dependence of the leading order (LO) and NLO QCD corrected cross sections on the colliding energy [Formula: see text]. Our calculation includes the subsequent full weak decays of the final [Formula: see text]-odd mirror quarks by adopting the narrow width app

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Ogul, Hasan, and Kamuran Dilsiz. "Cross Section Prediction for Inclusive Production of Z Boson in pp Collisions at s=14 TeV: A Study of Systematic Uncertainty due to Scale Dependence." Advances in High Energy Physics 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8262018.

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Prediction of Z→l+l- production cross section (where l±=e±,μ±) in proton-proton collisions at s=14 TeV is estimated up to next-to-next-to-leading order (NNLO) in perturbative QCD including next-to-leading order (NLO) electroweak (EW) corrections. The total inclusive Z boson production cross section times leptonic branching ratio, within the invariant mass window 66<mll<116 GeV, is predicted using NNLO HERAPDF2.0 at NNLO QCD and NLO EW as σZTot=2111.69-26.92+26.31 (PDF) ±11 (αs) ±17 (scale) -30.98+57.41 (parameterization and model). Theoretical prediction of the fiducial cross section is

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Hermansson-Truedsson, Nils. "Chiral Perturbation Theory at NNNLO." Symmetry 12, no. 8 (2020): 1262. http://dx.doi.org/10.3390/sym12081262.

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Chiral perturbation theory is a much successful effective field theory of quantum chromodynamics at low energies. The effective Lagrangian is constructed systematically order by order in powers of the momentum p2, and until now the leading order (LO), next-to leading order (NLO), next-to-next-to leading order (NNLO) and next-to-next-to-next-to leading order (NNNLO) have been studied. In the following review we consider the construction of the Lagrangian and in particular focus on the NNNLO case. We in addition review and discuss the pion mass and decay constant at the same order, which are fun

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Chirilli, Giovanni Antonio. "Rapidity evolution of Wilson lines at the next-to-leading order: Balitsky–JIMWLK equation at NLO." Nuclear Physics A 931 (November 2014): 1130–35. http://dx.doi.org/10.1016/j.nuclphysa.2014.09.073.

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19

Nomura, Daisuke. "Hadronic Leading Order Contribution to the Muon g-2." EPJ Web of Conferences 179 (2018): 01016. http://dx.doi.org/10.1051/epjconf/201817901016.

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We calculate the Standard Model (SM) prediction for the muon anomalous magnetic moment. By using the latest experimental data for e+e- → hadrons as input to dispersive integrals, we obtain the values of the leading order (LO) and the next-to-leading-order (NLO) hadronic vacuum polarisation contributions as ahad, LO VPμ = (693:27 ± 2:46) × 10-10 and ahad, NLO VP μ = (_9.82 ± 0:04) × 1010-10, respectively. When combined with other contributions to the SM prediction, we obtain aμ(SM) = (11659182:05 ± 3.56) × 10-10; which is deviated from the experimental value by Δaμ(exp) _ aμ(SM) = (27.05 ± 7.26

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20

WANG, JIAN, GUOMING CHEN, and WEIMIN WU. "THE IMPACT OF LO, NLO AND NNLO FOR THE HIGGS SEARCHING AT $\sqrt{s} = 7$ TeV OF LHC." Modern Physics Letters A 25, no. 36 (2010): 3027–31. http://dx.doi.org/10.1142/s0217732310034146.

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Most of current Monte Carlo studies on the Higgs searching are based on LO, or NLO calculation. However, in recent years, the next-to-next-to-leading order (NNLO) corrections have been computed for some physics process, and found that the cross section increases the kinematics changes. As the results, the analysis results could be impacted by these high order QCD corrections. We use standard Monte Carlo generator for LO, as well as MC@NLO for NLO and ResBos for NNLO at 7 TeV of LHC to evaluate this impact for physics channel of the Higgs, mass at 165 GeV, to WW, then W decay to lepton and neut

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21

DAWSON, S., C. B. JACKSON, L. REINA, and D. WACKEROTH. "Higgs Boson Production with Bottom Quarks at Hadron Colliders." International Journal of Modern Physics A 20, no. 15 (2005): 3353–55. http://dx.doi.org/10.1142/s0217751x05026558.

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22

ZHANG, HANZHONG, and ENKE WANG. "A NLO ANALYSIS ON AZIMUTHAL ANISOTROPY OF HIGH pT HADRON IN HEAVY-ION COLLISIONS." International Journal of Modern Physics E 16, no. 10 (2007): 3185–92. http://dx.doi.org/10.1142/s021830130700918x.

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The azimuthal anisotropy of high pT hadron in high energy A + A collisions is studied within the next-to-leading order (NLO) perturbative QCD parton model. The effect of jet quenching is incorporated via a model for modified jet fragmentation functions due to radiative parton energy loss in dense medium. Because NLO contributions behave with stronger quenching effect than LO contributions, the NLO elliptic flow parameter is found to be larger than the LO in the medium pT region.

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23

Chen, Chong, Lei Guo, Wen-Gan Ma, Ren-You Zhang, Xiao-Zhou Li, and Yu Zhang. "Possible effects of the large extra dimensions on ZZW production at the LHC." Modern Physics Letters A 29, no. 31 (2014): 1450153. http://dx.doi.org/10.1142/s0217732314501533.

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We investigate the possible large extra dimensions (LED) effects induced by the Kaluza–Klein (KK) gravitons up to the QCD next-to-leading order (NLO) on ZZW production at the large hadron collider (LHC). The integrated cross-sections and some kinematic distributions are presented in both the Standard Model (SM) and the LED model. The numerical results demonstrate that the NLO QCD corrections are sizeable and remarkably reduce the leading order (LO) LED effect depending strongly on the phase space. The NLO LED relative discrepancies of the total cross-section could become sizable for the ZZW pr

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Mangano, Michelangelo, and Andrea Petrell. "NLO Quarkonium Production in Hadronic Collisions." International Journal of Modern Physics A 12, no. 22 (1997): 3887–97. http://dx.doi.org/10.1142/s0217751x97002048.

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We present some preliminary results on the next-to-leading order calculation in QCD of quarkonium production cross sections in hadronic collisions. We will show that the NLO total cross sections for P-wave states produced at high energy are not reliable, due to the appearance of very large and negative contributions. We also discuss some issues related to the structure of final states in colour-octet production and to high-pt fragmentation.

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KHANPOUR, H., ALI N. KHORRAMIAN, and S. ATASHBAR TEHRANI. "DETERMINATION OF THE STRONG COUPLING CONSTANT FROM NLO QCD ANALYSIS OF PROTON STRUCTURE FUNCTION." International Journal of Modern Physics A 26, no. 03n04 (2011): 658–59. http://dx.doi.org/10.1142/s0217751x11052396.

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In this article we present a determination of the strong coupling constant and parton distribution functions (PDFs) based on a next-to-leading order (NLO) perturbative QCD analysis of proton structure function. More precisely, we extract [Formula: see text] and PDFs by fitting perturbative QCD predictions to the data from the measurements of the proton structure function [Formula: see text] in deep inelastic scattering, which are based on perturbative QCD calculations up to NLO. We obtain at NLO [Formula: see text] in the variable-flavor number scheme.

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Baral, R. C., S. K. Tripathy, M. Younus, Z. Naik, and P. K. Sahu. "Production of D-mesons in p + p and p + Pb collisions at LHC energies." International Journal of Modern Physics E 25, no. 11 (2016): 1650092. http://dx.doi.org/10.1142/s0218301316500920.

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We present theoretical model comparison with published ALICE results for [Formula: see text]-mesons ([Formula: see text], [Formula: see text] and [Formula: see text]) in [Formula: see text] collisions at [Formula: see text] = 7 TeV and [Formula: see text] collisions at [Formula: see text][Formula: see text]TeV. Event generator Heavy-Ion Jet Interaction Generator (HIJING), transport calculation of AMPT and calculations from Next-to-Leading Order (NLO)(MNR) and Fixed-Order Next-to-Leading-Logarithmic (FONLL) have been used for this study. We found that HIJING and AMPT model predictions are match

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CHIRILLI, GIOVANNI ANTONIO. "NLO EVOLUTION OF STRUCTURE FUNCTIONS AT SMALL x." International Journal of Modern Physics: Conference Series 04 (January 2011): 46–55. http://dx.doi.org/10.1142/s2010194511001553.

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Using the high-energy Operator Product Expansion of the T-product of two electromagnetic currents, we calculate the Photon Impact Factor for Deep Inelastic Scattering at small value of the Bjorken variable x B at the next-to-leading order (NLO) accuracy in αs. We provide for the first time an analytic expression in coordinate space and in Mellin space of the NLO impact factor for the forward unpolarized structure functions.

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28

Ocalan, Kadir. "EW radiative corrections to theory predictions of charge asymmetry for W-boson hadroproduction." Physica Scripta 97, no. 7 (2022): 075305. http://dx.doi.org/10.1088/1402-4896/ac789a.

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Abstract The higher-order predictions of the lepton charge asymmetry A η l (the W-boson charge asymmetry A y W ) for the leptonic final state of the W-boson hadroproduction in proton–proton (pp) collisions are presented. The predictions from the state-of-the-art computations are reported for achieving adequate description of the A η l by including next-to-leading order (NLO) electroweak (EW) radiative corrections in combination with next-to-NLO (NNLO) quantum chromodynamics (QCD) radiative corrections. The combined predictions NNLO QCD+NLO EW and NNLO QCD × NLO EW, based on standard additive a

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29

CHIRILLI, GIOVANNI, BO-WEN XIAO, and FENG YUAN. "THE NLO INCLUSIVE FORWARD HADRON PRODUCTION IN pA COLLISIONS." International Journal of Modern Physics: Conference Series 20 (January 2012): 208–13. http://dx.doi.org/10.1142/s2010194512009257.

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Recently, by performing the complete next-to-leading order calculation, we have demonstrated the one-loop factorization for inclusive hadron productions in pA collisions in the saturation formalism. The differential cross section is written into a factorization form in the coordinate space at the next-to-leading order, while the naive form of the convolution in the transverse momentum space does not hold. The rapidity divergence with small-x dipole gluon distribution of the nucleus is factorized into the energy evolution of the dipole gluon distribution function, which is known as the Balitsky

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Escobedo, Miguel Ángel, and Tuomas Lappi. "The dipole picture and the non-relativistic expansion." EPJ Web of Conferences 258 (2022): 04006. http://dx.doi.org/10.1051/epjconf/202225804006.

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We study exclusive quarkonium production in the dipole picture at next-to-leading order (NLO) accuracy, using the non-relativistic expansion for the quarkonium wavefunction. The quarkonium light cone wave functions needed in the dipole picture have typically been available only at tree level, either in phenomenological models or in the nonrelativistic limit. Here, we discuss the compatibility of the dipole approach and the non-relativistic expansion and compute NLO relativistic corrections to the quarkonium light-cone wave function in light-cone gauge.

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Xing, Hongxi, and Shinsuke Yoshida. "Introduction to the Transverse-Momentum-Weighted Technique in the Twist-3 Collinear Factorization Approach." Advances in High Energy Physics 2019 (June 2, 2019): 1–15. http://dx.doi.org/10.1155/2019/4825790.

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The twist-3 collinear factorization framework has drawn much attention in recent decades as a successful approach in describing the data for single spin asymmetries (SSAs). Many SSAs data have been experimentally accumulated in a variety of energies since the first measurement was done in the late 1970s and it is expected that the future experiments like Electron-Ion-Collider will provide us with more data. In order to perform a consistent and precise description of the data taken in different kinematic regimes, the scale evolution of the collinear twist-3 functions and the perturbative higher

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Mulyawan, R. G., A. Salam та I. Fachruddin. "Bootstrapping Energy-Energy Correlation in Planar 𝓝 = 4 Supersymmetric Yang-Mills". Journal of Physics: Conference Series 2377, № 1 (2022): 012049. http://dx.doi.org/10.1088/1742-6596/2377/1/012049.

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The two-point energy flow correlation, alternatively dubbed the energy-energy correlation (EEC), is a class of conformal field theory observable in the maximally supersymmetric Yang-Mills theory (𝓝 = 4) related to the event shapes in scattering experiments. It has been calculated up to the next-to-leading order (NLO) recently, showcasing the simplicity of the correlation function. This paper calculates the EEC using an approach based on its polylogarithmic functions. Using the amplitude bootstrap method, two ansatzes are made for the energy flow operators, namely the polylogarithm ansatz craft

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ZIELIŃSKI, MAREK. "STUDY OF DIRECT-PHOTON AND PION PRODUCTION." International Journal of Modern Physics A 16, supp01a (2001): 232–34. http://dx.doi.org/10.1142/s0217751x01006577.

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We present comparisons of high-pT photon and pion production in hadronic interactions with expectations from next-to-leading order pertubative QCD (NLO pQCD). We also comment on phenomenological models of kT smearing (which approximate effects of additional soft-gluon emission) and on the status of resummation calculations.

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Heinrich, Gudrun, and Jannis Lang. "SMEFT truncation effects in Higgs boson pair production at NLO QCD." Journal of Physics: Conference Series 2438, no. 1 (2023): 012153. http://dx.doi.org/10.1088/1742-6596/2438/1/012153.

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Abstract We present results for Higgs boson pair production in gluon fusion at next-to-leading order in QCD, including effects of anomalous couplings within Standard Model Effective Field Theory (SMEFT). In particular, we investigate truncation effects of the SMEFT series, comparing different ways to treat powers of dimension-six operators and double operator insertions.

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VIJAYA KUMAR, K. B., YONG-LIANG MA, and YUE-LIANG WU. "SPIN POLARIZABILITY OF THE NUCLEON IN THE EFFECTIVE FIELD THEORY OF HEAVY BARYON." International Journal of Modern Physics A 21, no. 19n20 (2006): 3947–66. http://dx.doi.org/10.1142/s0217751x06031521.

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We have constructed a heavy baryon effective field theory with photon as an external field in accordance with the symmetry requirements similar to the heavy quark effective field theory. By treating the heavy baryon and antibaryon equally on the same footing in the effective field theory, we have calculated the spin polarizabilities γi, i = 1,…,4 of the nucleon at third order and at fourth-order of the spin-dependent Compton scattering. At leading order (LO), our results agree with the corresponding results of the heavy baryon chiral perturbation theory, at the next-to-leading order (NLO) the

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Haidenbauer, Johann, and Ulf-G. Meißner. "Status of the hyperon-nucleon interaction in chiral effective field theory." EPJ Web of Conferences 271 (2022): 05001. http://dx.doi.org/10.1051/epjconf/202227105001.

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The Jülich-Bonn group aims at an extensive study of the baryonbaryon (BB) interaction involving strange baryons (Λ, Σ, Ξ) within SU(3) chiral effective field theory. An overview of achievements and new developments over the past few years is provided. The topics covered are: 1) Derivation of the leading charge-symmetry breaking (CSB) interaction for the ΛN system and its application in a study of CSB effects in A=4 Λ-hypernuclei. 2) Updated results for the ΞN interaction at NLO and predictions for Ξ−p correlation functions. 3) Extension of the ΛN-ΣN interaction to next-to-next-to-leading order

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Shen, Dandan, Huimin Ren, Fan Wu та Ruilin Zhu. "Bc → J/ψ tensor form factors at large momentum recoil". International Journal of Modern Physics A 36, № 19 (2021): 2150135. http://dx.doi.org/10.1142/s0217751x21501359.

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We present a next-to-leading order (NLO) relativistic correction to [Formula: see text] tensor form factors within nonrelativistic QCD (NRQCD). We also consider complete Dirac bilinears [Formula: see text] with [Formula: see text] matrices [Formula: see text] in the [Formula: see text] transition. The relation among different current form factors is given and it shows that symmetries emerge in the heavy bottom quark limit. For a phenomenological extension, we propose to extract the long-distance matrix elements (LDMEs) for [Formula: see text] meson from the recent HPQCD lattice data and the NL

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38

Xing, Hongxi, Zhong-Bo Kang, Enke Wang, and Xin-Nian Wang. "QCD Evolution of Nuclear Quark-Gluon Correlation Function." International Journal of Modern Physics: Conference Series 37 (January 2015): 1560061. http://dx.doi.org/10.1142/s2010194515600617.

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We summarize the results on the next-to-leading order (NLO) calculations of transverse momentum broadening in semi-inclusive deeply inelastic e + A scattering (SIDIS) and Drell-Yan dilepton production (DY) in p + A collisions. The corresponding transverse momentum weighted differential cross sections are shown to factorize at NLO. Our calculations identify the QCD evolution equation for the quark-gluon correlation function, and also confirm the universality of the associated quark-gluon correlation function in SIDIS and DY. The evolution equation can be further applied to determine the QCD fac

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39

Meng, Rui-Qing, Sheng-Quan Wang, Ting Sun, Chao-Qin Luo, Jian-Ming Shen, and Xing-Gang Wu. "QCD improved top-quark decay at next-to-next-to-leading order." European Physical Journal C 83, no. 1 (2023). http://dx.doi.org/10.1140/epjc/s10052-023-11224-4.

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AbstractWe analyse the top-quark decay at the next-to-next-to-leading order (NNLO) in QCD by using the Principle of Maximum Conformality (PMC) which provides a systematic way to eliminate renormalization scheme and scale ambiguities in perturbative QCD predictions. The PMC renormalization scales of the coupling constant $$\alpha _s$$ α s are determined by absorbing the non-conformal $$\beta $$ β terms that govern the behavior of the running coupling by using the Renormalization Group Equation (RGE). We obtain the PMC scale $$Q_\star =15.5$$ Q ⋆ = 15.5 GeV for the top-quark decay, which is an o

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40

Di Luzio, Luca, та Gioacchino Piazza. "a → πππ decay at next-to-leading order in chiral perturbation theory". Journal of High Energy Physics 2022, № 12 (2022). http://dx.doi.org/10.1007/jhep12(2022)041.

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Abstract We discuss the construction of the two-flavour axion-pion effective Lagrangian at the next-to-leading order (NLO) in chiral perturbation theory and present, as a phenomenological application, the calculation of the decay rate of a GeV-scale axion-like particle via the channel a → πππ. Through the NLO calculation, we assess the range of validity of the effective field theory and show that the chiral expansion breaks down just above the kinematic threshold. Alternative non-perturbative approaches are called for in order to extend the chiral description of axion-pion interactions.

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41

Brambilla, Nora, Miguel Ángel Escobedo, Ajaharul Islam, et al. "Heavy quarkonium dynamics at next-to-leading order in the binding energy over temperature." Journal of High Energy Physics 2022, no. 8 (2022). http://dx.doi.org/10.1007/jhep08(2022)303.

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Abstract Using the potential non-relativistic quantum chromodynamics (pNRQCD) effective field theory, we derive a Lindblad equation for the evolution of the heavy-quarkonium reduced density matrix that is accurate to next-to-leading order (NLO) in the ratio of the binding energy of the state to the temperature of the medium. The resulting NLO Lindblad equation can be used to more reliably describe heavy-quarkonium evolution in the quark-gluon plasma at low temperatures compared to the leading-order truncation. For phenomenological application, we numerically solve the resulting NLO Lindblad eq

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Rein, Felix, Simone Rodini, Andreas Schäfer, and Alexey Vladimirov. "Sivers, Boer-Mulders and worm-gear distributions at next-to-leading order." Journal of High Energy Physics 2023, no. 1 (2023). http://dx.doi.org/10.1007/jhep01(2023)116.

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Abstract We compute the Sivers, Boer-Mulders, worm-gear (T and L) transverse momentum dependent distributions in terms of twist-two and twist-three collinear distributions in the small-b limit up to next-to-leading order (NLO) in perturbation theory.

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43

Feng, Feng, Yu Jia, and Wen-Long Sang. "Next-to-leading-order QCD corrections to heavy quark fragmentation into $${}^1S^{(1,8)}_0$$ quarkonia." European Physical Journal C 81, no. 7 (2021). http://dx.doi.org/10.1140/epjc/s10052-021-09390-4.

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AbstractWithin NRQCD factorization framework, in this work we compute, at the lowest order in velocity expansion, the next-to-leading-order (NLO) perturbative corrections to the short-distance coefficients associated with heavy quark fragmentation into the $${}^1S_0^{(1,8)}$$ 1 S 0 ( 1 , 8 ) components of a heavy quarkonium. Starting from the Collins and Soper’s operator definition of the quark fragmentation function, we apply the sector decomposition method to facilitate the numerical manipulation. It is found that the NLO QCD corrections have a significant impact.

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44

Contreras, Carlos, Eugene Levin, and Rodrigo Meneses. "BFKL equation in the next-to-leading order: solution at large impact parameters." European Physical Journal C 79, no. 10 (2019). http://dx.doi.org/10.1140/epjc/s10052-019-7363-6.

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Abstract In this paper, we show (1) that the NLO corrections do not change the power-like decrease of the scattering amplitude at large impact parameter ($$b^2 \,>\,r^2 \exp ( 2{\bar{\alpha }}_S\eta (1 + 4 {\bar{\alpha }}_S) )$$b2>r2exp(2α¯Sη(1+4α¯S)), where r denotes the size of scattering dipole and $$\eta = \ln (1/x_{Bj} )$$η=ln(1/xBj) for DIS), and, therefore, they do not resolve the inconsistency with unitarity; and (2) they lead to an oscillating behaviour of the scattering amplitude at large b, in direct contradiction with the unitarity constraints. However, from the more practica

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Bergabo, Filip, and Jamal Jalilian-Marian. "Single inclusive hadron production in DIS at small x: next to leading order corrections." Journal of High Energy Physics 2023, no. 1 (2023). http://dx.doi.org/10.1007/jhep01(2023)095.

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Abstract We calculate the one-loop corrections to single inclusive hadron production in Deep Inelastic Scattering (DIS) at small x in the forward rapidity region using the Color Glass Condensate formalism. We show that the divergent parts of the next to leading order (NLO) corrections either cancel among each other or lead to x (rapidity) evolution of the leading order (LO) dipole cross section according to the JIMWLK evolution equation and DGLAP evolution of the parton-hadron fragmentation function. The remaining finite parts constitute the NLO (αs) corrections to the LO single inclusive hadr

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Campbell, John M., Giuseppe De Laurentis, R. Keith Ellis та Satyajit Seth. "The pp → W(→ lν) + γ process at next-to-next-to-leading order". Journal of High Energy Physics 2021, № 7 (2021). http://dx.doi.org/10.1007/jhep07(2021)079.

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Abstract We present details of the calculation of the pp → W(→ lν)γ process at next-to-next-to-leading order in QCD, calculated using the jettiness slicing method. The calculation is based entirely on analytic amplitudes. Because of the radiation zero, the NLO QCD contribution from the gq channel is as important as the contribution from the Born $$ q\overline{q} $$ q q ¯ process, disrupting the normal counting of leading and sub-leading contributions. We also assess the importance of electroweak (EW) corrections, including the EW corrections to both the six-parton channel 0 →$$ \overline{u} d\

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Iancu, Edmond, and Yair Mulian. "Forward dijets in proton-nucleus collisions at next-to-leading order: the real corrections." Journal of High Energy Physics 2021, no. 3 (2021). http://dx.doi.org/10.1007/jhep03(2021)005.

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Abstract Using the CGC effective theory together with the hybrid factorisation, we study forward dijet production in proton-nucleus collisions beyond leading order. In this paper, we compute the “real” next-to-leading order (NLO) corrections, i.e. the radiative corrections associated with a three-parton final state, out of which only two are being measured. To that aim, we start by revisiting our previous results for the three-parton cross-section presented in [1]. After some reshuffling of terms, we deduce new expressions for these results, which not only look considerably simpler, but are al

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Zhang, Yu-Dong, Feng Feng, Wen-Long Sang, and Hong-Fei Zhang. "Next-to-leading-order QCD corrections to a vector bottomonium radiative decay into a charmonium." Journal of High Energy Physics 2021, no. 12 (2021). http://dx.doi.org/10.1007/jhep12(2021)189.

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Abstract Within the framework of nonrelativistic QCD (NRQCD) factorization, we calculate the next-to-leading-order (NLO) perturbative corrections to the radiative decay Υ → ηc(χcJ) + γ. Both the helicity amplitudes and the helicity decay widths are obtained. It is the first computation for the processes involving both bottomonium and charmonium at two-loop accuracy. By employing the Cheng-Wu theorem, we are able to convert most of complex-valued master integrals (MIs) into real-valued MIs, which makes the numerical integration much efficient. Our results indicate the $$ \mathcal{O}\left({\alph

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Lansberg, Jean-Philippe, Maxim Nefedov, and Melih A. Ozcelik. "Matching next-to-leading-order and high-energy-resummed calculations of heavy-quarkonium-hadroproduction cross sections." Journal of High Energy Physics 2022, no. 5 (2022). http://dx.doi.org/10.1007/jhep05(2022)083.

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Abstract The energy dependence of the total hadroproduction cross section of pseudoscalar quarkonia is computed via matching Next-to-Leading Order (NLO) Collinear-Factorisation (CF) results with resummed higher-order corrections, proportional to $$ {\alpha}_s^n{\ln}^{n-1} $$ α s n ln n − 1 (1/z), to the CF hard-scattering coefficient, where z = M2/$$ \hat{s} $$ s ̂ with M and $$ \hat{s} $$ s ̂ being the quarkonium mass and the partonic center-of-mass energy squared. The resummation is performed using High-Energy Factorisation (HEF) in the Doubly-Logarithmic (DL) approximation, which is a subse

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Contreras, Carlos, Eugene Levin, Rodrigo Meneses, and Michael Sanhueza. "Non-linear equation in the re-summed next-to-leading order of perturbative QCD: the leading twist approximation." European Physical Journal C 80, no. 11 (2020). http://dx.doi.org/10.1140/epjc/s10052-020-08580-w.

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AbstractIn this paper, we use the re-summation procedure, suggested in Ducloué et al. (JHEP 1904:081, 2019), Salam (JHEP 9807:019 1998), Ciafaloni et al. (Phys Rev D 60:1140361999) and Ciafaloni et al. (Phys Rev D 68:114003, 2003), to fix the BFKL kernel in the NLO. However, we suggest a different way to introduce the non-linear corrections in the saturation region, which is based on the leading twist non-linear equation. In the kinematic region: $$\tau \,\equiv \,r^2 Q^2_s(Y)\,\le \,1$$ τ ≡ r 2 Q s 2 ( Y ) ≤ 1 , where r denotes the size of the dipole, Y its rapidity and $$Q_s$$ Q s the satura

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