Artigos de revistas: "Zγ production"

1

Dawson, S., Xiao-Gang He e G. Valencia. "violation in Wγ and Zγ production". Physics Letters B 390, n.º 1-4 (janeiro de 1997): 431–36. http://dx.doi.org/10.1016/s0370-2693(96)01364-0.

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2

BU, XUEBING. "Wγ AND Zγ PRODUCTION AND LIMITS ON ANOMALOUS WWγ, ZZγ AND Zγγ COUPLINGS WITH D0 DETECTOR". International Journal of Modern Physics A 27, n.º 14 (27 de maio de 2012): 1230014. http://dx.doi.org/10.1142/s0217751x12300141.

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The recent D0 results on Wγ and Zγ production are presented. First, the cross-section and the difference in rapidities between photons and charged leptons for inclusive W(→lν)+γ production in eγ and μγ final states are discussed, then are the cross-section and differential cross-section as a function of photon transverse momentum for Zγ→l+l-(l = e, μ) process. Finally, I present the limits on anomalous WWγ, ZZγ and Zγγ couplings.

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3

Belyaev, Nikita, Alexandr Petukhov e Evgeny Soldatov. "New methods of distinguishing the associated Zγ production". EPJ Web of Conferences 222 (2019): 02015. http://dx.doi.org/10.1051/epjconf/201922202015.

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Indirect searches of beyond the Standard Model effects are discussed. The Z(νν−)γ process is considered in this respect. The limiting factors of the separation of this process from the background one are studied phenomenologically. New potential selection methods are proposed to increase the signal to background ratio.

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4

Grazzini, Massimiliano, Stefan Kallweit, Dirk Rathlev e Alessandro Torre. "Zγ production at hadron colliders in NNLO QCD". Physics Letters B 731 (abril de 2014): 204–7. http://dx.doi.org/10.1016/j.physletb.2014.02.037.

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5

Soldatov, E. Yu. "Standard Model physics at ATLAS". EPJ Web of Conferences 222 (2019): 01002. http://dx.doi.org/10.1051/epjconf/201922201002.

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The latest advances in Standard Model measurements performed by the ATLAS experiment at the LHC are discussed. Vector-boson scattering processes have been observed in several final states (ZZ, WZ, same-sign WW), and evidence has been reached in the Zγ final state. The experimental precision of QCD measurements has reached the same order as the theoretical uncertainties on the NNLO calculations. Evidence for the triboson WVV final state has been achieved. The latest results on V+jets, Zγ, W+W− and direct photons production are presented. New results on jet substructure and forward proton tagging program are also discussed.

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6

Wang, Jian. "Diboson production at LHC and Tevatron". International Journal of Modern Physics A 29, n.º 24 (29 de setembro de 2014): 1430056. http://dx.doi.org/10.1142/s0217751x14300567.

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The experimental results on physics of diboson production are reviewed. The measurements use pp collision at the LHC with center-of-mass energy [Formula: see text] and 8 TeV, and [Formula: see text] collision at the Tevatron with [Formula: see text]. These include measurements of Wγ, Zγ, WW, WZ and ZZ production. The results are compared with Standard Model predictions, and are interpreted in terms of constraints on charged and neutral anomalous triple gauge couplings.

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7

Ohnemus, J., e W. J. Stirling. "Bremsstrahlung contributions to hadronic W±γ and Zγ production". Physics Letters B 298, n.º 1-2 (janeiro de 1993): 230–35. http://dx.doi.org/10.1016/0370-2693(93)91735-6.

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8

Wang, Jian. "Diboson production at LHC and Tevatron". International Journal of Modern Physics: Conference Series 31 (janeiro de 2014): 1460279. http://dx.doi.org/10.1142/s2010194514602798.

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This is a report at the conference Physics In Collision 2013. The experimental results on physics of diboson production are reviewed. The measurements use pp collision at the LHC with center-of-mass energy [Formula: see text] and 8 TeV, and [Formula: see text] collision at the Tevatron with [Formula: see text]. These include measurements of Wγ, Zγ, WW, WZ and ZZ production. The results are compared with Standard Model predictions, and are interpreted in terms of constraints on charged and neutral anomalous triple gauge couplings.

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9

Bozzi, G., F. Campanario, M. Rauch, H. Rzehak e D. Zeppenfeld. "NLO QCD corrections to W±Zγ production with leptonic decays". Physics Letters B 696, n.º 4 (fevereiro de 2011): 380–85. http://dx.doi.org/10.1016/j.physletb.2010.12.051.

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10

Accomando, E., A. Denner e C. Meier. "Electroweak corrections to Wγ and Zγ production at the LHC". European Physical Journal C 47, n.º 1 (19 de abril de 2006): 125–46. http://dx.doi.org/10.1140/epjc/s2006-02521-y.

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11

Abdallah, J., P. Abreu, W. Adam, P. Adzic, T. Albrecht, R. Alemany-Fernandez, T. Allmendinger et al. "Zγ* production in e+e- interactions at $\sqrt{s} = 183-209\,\text{GeV}$". European Physical Journal C 51, n.º 3 (5 de julho de 2007): 503–23. http://dx.doi.org/10.1140/epjc/s10052-007-0339-y.

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12

Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic et al. "Measurement of Wγ and Zγ production in pp collisions at s=7 TeV". Physics Letters B 701, n.º 5 (julho de 2011): 535–55. http://dx.doi.org/10.1016/j.physletb.2011.06.034.

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13

Schott, Matthias, e Junjie Zhu. "Diboson production in proton–proton collisions at $\sqrt{s} = 7~{\rm TeV}$". International Journal of Modern Physics A 29, n.º 26 (16 de outubro de 2014): 1430053. http://dx.doi.org/10.1142/s0217751x14300531.

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This review summarizes results on the production cross-section measurements of electroweak boson pairs (WW, WZ, ZZ, Wγ and Zγ) at the Large Hadron Collider (LHC) in pp collisions at a center-of-mass energy of [Formula: see text]. The two general-purpose detectors at the LHC, ATLAS and CMS recorded an integrated luminosity of ≈5 fb -1 in 2011, which offered the possibility to study the properties of diboson production to high precision. These measurements test predictions of the Standard Model (SM) in a new energy regime and are crucial for the understanding and the measurement of the SM Higgs boson and other new particles. In this review, special emphasis is drawn on the combination of results from both experiments and a common interpretation with respect to state-of-the-art SM predictions.

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14

Belyaev, N. L., A. M. Petukhov e E. Yu Soldatov. "The automation of choosing of the optimal kinematic variables for discrimination of the electroweak Zγ production". Journal of Physics: Conference Series 1390 (novembro de 2019): 012040. http://dx.doi.org/10.1088/1742-6596/1390/1/012040.

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15

Abazov, V. M., B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, E. Aguilo et al. "Zγ production and limits on anomalous ZZγ and Zγγ couplings in pp¯ collisions at s=1.96 TeV". Physics Letters B 653, n.º 5-6 (setembro de 2007): 378–86. http://dx.doi.org/10.1016/j.physletb.2007.08.035.

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16

Petukhov, A. M., e E. Yu Soldatov. "Usage of machine learning for the separation of electroweak and strong Zγ production at the LHC experiments". Journal of Physics: Conference Series 934 (dezembro de 2017): 012028. http://dx.doi.org/10.1088/1742-6596/934/1/012028.

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17

Brodsky, Stanley J. "Physics Opportunities at a Photon–Photon Collider". International Journal of Modern Physics A 18, n.º 16 (30 de junho de 2003): 2871–92. http://dx.doi.org/10.1142/s0217751x03016343.

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The advent of back-scattered laser beams for e±e-colliders will allow detailed studies of a large array of high energy γγ and γe collision processes with polarized beams. These include tests of electroweak theory in photon-photon annihilation such as γγ → W+W-, γγ → Higgs bosons, and higher-order loop processes, such as γγ → γγ, Zγ, H0Z0and ZZ. Methods for measuring the anomalous magnetic and quadrupole moments of the W and Z gauge bosons to high precision in polarized electron-photon and photon-photon collisions are discussed. Since each photon can be resolved into a W+W-pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying WW collisions and annihilation. I also review high energy γγ and eγ tests of quantum chromodynamics, including the production of two gluon jets in photon-photon collisions, deeply virtual Compton scattering on a photon target, and leading-twist single-spin asymmetries for a photon polarized normal to a production plane. Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes which are also important for the analysis of exclusive semi-leptonic and two-body hadronic B-decays.

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18

Baldenegro, Cristian. "Probing Anomalous Quartic Interactions at the LHC with proton tagging". EPJ Web of Conferences 172 (2018): 06002. http://dx.doi.org/10.1051/epjconf/201817206002.

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One of the main goals of the Large Hadron Collider is to find signatures of physics Beyond the Standard Model of particle physics. One way to do this is by studying with high precision the interactions of the Standard Model. In this talk, we address the discovery potential of New Physics in the exclusive channel pp → p X p which relies on the general purpose detectors at the Large Hadron Collider and their respective forward proton detector stations, located at about ~ 210 m w.r.t. the interaction point. These reactions are highly sensitive to quartic electroweak gauge interactions. As a proof of concept, we discuss the exclusive diphoton production at high diphoton invariant mass. We quote sensitivities on the anomalous γγγγ coupling for an integrated luminosity of 300 fb1 at the center-of-mass energy of 14 TeV.We also discuss the discovery potential of 3γZ anomalous quartic gauge coupling by measuring the pp → p(γγ → Zγ)p reaction.

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19

Dixon, L., Z. Kunszt e A. Signer. "Helicity amplitudes for O(αs) production of W+W−, W±Z, ZZ, W±γ, or Zγ pairs at hadron colliders". Nuclear Physics B 531, n.º 1-3 (outubro de 1998): 3–23. http://dx.doi.org/10.1016/s0550-3213(98)00421-0.

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20

Aad, G., B. Abbott, D. C. Abbott, A. Abed Abud, K. Abeling, D. K. Abhayasinghe, S. H. Abidi et al. "Evidence for electroweak production of two jets in association with a Zγ pair in pp collisions at s=13 TeV with the ATLAS detector". Physics Letters B 803 (abril de 2020): 135341. http://dx.doi.org/10.1016/j.physletb.2020.135341.

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21

Semushin, A. E., e E. Yu Soldatov. "Technique for Setting Limits on the Coupling Constants of the Effective Theory from Electroweak Zγ Production at the Conditions of Run-2 of the ATLAS Experiment". Physics of Atomic Nuclei 84, n.º 12 (dezembro de 2021): 1976–81. http://dx.doi.org/10.1134/s106377882111003x.

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22

Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, B. Abi et al. "Measurement of Wγ and Zγ production cross sections in pp collisions at s=7 TeV and limits on anomalous triple gauge couplings with the ATLAS detector". Physics Letters B 717, n.º 1-3 (outubro de 2012): 49–69. http://dx.doi.org/10.1016/j.physletb.2012.09.017.

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23

Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter et al. "Measurement of the Zγ→νν‾γ production cross section in pp collisions at s=8 TeV and limits on anomalous ZZγ and Zγγ trilinear gauge boson couplings". Physics Letters B 760 (setembro de 2016): 448–68. http://dx.doi.org/10.1016/j.physletb.2016.06.080.

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24

Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter et al. "Measurement of the cross section for electroweak production of Zγ in association with two jets and constraints on anomalous quartic gauge couplings in proton–proton collisions at s=8 TeV". Physics Letters B 770 (julho de 2017): 380–402. http://dx.doi.org/10.1016/j.physletb.2017.04.071.

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25

Campbell, John M., Tobias Neumann e Ciaran Williams. "Zγ production at NNLO including anomalous couplings". Journal of High Energy Physics 2017, n.º 11 (novembro de 2017). http://dx.doi.org/10.1007/jhep11(2017)150.

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26

Lombardi, Daniele, Marius Wiesemann e Giulia Zanderighi. "Advancing MıNNLOPS to diboson processes: Zγ production at NNLO+PS". Journal of High Energy Physics 2021, n.º 6 (junho de 2021). http://dx.doi.org/10.1007/jhep06(2021)095.

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Abstract We consider Zγ production in hadronic collisions and present the first computation of next-to-next-to-leading order accurate predictions consistently matched to parton showers (NNLO+PS). Spin correlations, interferences and off-shell effects are included by calculating the full process pp → ℓ+ℓ−γ. We extend the recently developed MiNNLOPS method to genuine 2 → 2 hard scattering processes at the LHC, which paves the way for NNLO+PS simulations of all diboson processes. This is the first 2 → 2 NNLO+PS calculation that does not require an a-posteriori multi-differential reweighting. We find that both NNLO corrections and matching to parton showers are crucial for an accurate simulation of the Zγ process. Our predictions are in very good agreement with recent ATLAS data.

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27

Goertz, Florian, Eric Madge, Pedro Schwaller e Valentin Titus Tenorth. "Discovering the h→Zγ decay in tt¯ associated production". Physical Review D 102, n.º 5 (11 de setembro de 2020). http://dx.doi.org/10.1103/physrevd.102.053004.

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28

Grazzini, Massimiliano, Stefan Kallweit e Dirk Rathlev. "Wγ and Zγ production at the LHC in NNLO QCD". Journal of High Energy Physics 2015, n.º 7 (julho de 2015). http://dx.doi.org/10.1007/jhep07(2015)085.

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29

Becher, Thomas, e Tobias Neumann. "Fiducial qT resummation of color-singlet processes at N3LL+NNLO". Journal of High Energy Physics 2021, n.º 3 (março de 2021). http://dx.doi.org/10.1007/jhep03(2021)199.

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Abstract We present a framework for qT resummation at N3LL+NNLO accuracy for arbitrary color-singlet processes based on a factorization theorem in SCET. Our implementation CuTe-MCFM is fully differential in the Born kinematics and matches to large-qT fixed-order predictions at relative order $$ {\alpha}_s^2 $$ α s 2 . It provides an efficient way to estimate uncertainties from fixed-order truncation, resummation, and parton distribution functions. In addition to W±, Z and H production, also the diboson processes γγ, Zγ, ZH and W±H are available, including decays. We discuss and exemplify the framework with several direct comparisons to experimental measurements as well as inclusive benchmark results. In particular, we present novel results for γγ and Zγ at N3LL+NNLO and discuss in detail the power corrections induced by photon isolation requirements.

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30

Bonilla, J., I. Brivio, J. Machado-Rodríguez e J. F. de Trocóniz. "Nonresonant searches for axion-like particles in vector boson scattering processes at the LHC". Journal of High Energy Physics 2022, n.º 6 (junho de 2022). http://dx.doi.org/10.1007/jhep06(2022)113.

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Abstract We propose a new search for Axion-Like Particles (ALPs), targeting Vector Boson Scattering (VBS) processes at the LHC. We consider nonresonant ALP-mediated VBS, where the ALP participates as an off-shell mediator. This process occurs whenever the ALP is too light to be produced resonantly, and it takes advantage of the derivative nature of ALP interactions with the electroweak Standard Model bosons. We study the production of ZZ, Zγ, W±γ, W±Z and W±W± pairs with large diboson invariant masses in association with two jets. Working in a gauge-invariant framework, upper limits on ALP couplings to electroweak bosons are obtained from a reinterpretation of Run 2 public CMS VBS analyses. The constraints inferred on ALP couplings to ZZ, Zγ and W±W± pairs are very competitive for ALP masses up to 100 GeV. They have the advantage of being independent of the ALP coupling to gluons and of the ALP decay width. Simple projections for LHC Run 3 and HL-LHC are also calculated, demonstrating the power of future dedicated analyses at ATLAS and CMS.

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31

Campanario, Francisco, Matthias Kerner e Dieter Zeppenfeld. "Zγ production in vector-boson scattering at next-to-leading order QCD". Journal of High Energy Physics 2018, n.º 1 (janeiro de 2018). http://dx.doi.org/10.1007/jhep01(2018)160.

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32

Carrá, Sonia, Vincent Goumarre, Ruchi Gupta, Sarah Heim, Beate Heinemann, Jan Küchler, Federico Meloni, Pablo Quilez e Yee-Chinn Yap. "Constraining off-shell production of axionlike particles with Zγ and WW differential cross-section measurements". Physical Review D 104, n.º 9 (18 de novembro de 2021). http://dx.doi.org/10.1103/physrevd.104.092005.

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33

Delgado, F., L. Duarte, J. Jones-Pérez, C. Manrique-Chavil e S. Peña. "Assessment of the dimension-5 seesaw portal and impact of exotic Higgs decays on non-pointing photon searches". Journal of High Energy Physics 2022, n.º 9 (12 de setembro de 2022). http://dx.doi.org/10.1007/jhep09(2022)079.

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Abstract The Dimension-5 Seesaw Portal is a Type-I Seesaw model extended by d = 5 operators involving the sterile neutrino states, leading to new interactions between all neutrinos and the Standard Model neutral bosons. In this work we focus primarily on the implications of these new operators at the GeV-scale. In particular, we recalculate the heavy neutrino full decay width, up to three-body decays. We also review bounds on the dipole operator, and revisit LEP constraints on its coefficient. Finally, we turn to heavy neutrino pair production from Higgs decays, where the former are long-lived and disintegrate into a photon and a light neutrino. We probe this process by recasting two ATLAS searches for non-pointing photons, showing the expected event distribution in terms of arrival time tγ and pointing variable |∆zγ|.

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34

Aad, G., B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi et al. "Measurement of Wγ and Zγ production in proton-proton collisions at $ \sqrt {s} = 7 $ TeV with the ATLAS detector". Journal of High Energy Physics 2011, n.º 9 (setembro de 2011). http://dx.doi.org/10.1007/jhep09(2011)072.

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35

Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö et al. "Measurement of the Zγ production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings". Journal of High Energy Physics 2015, n.º 4 (abril de 2015). http://dx.doi.org/10.1007/jhep04(2015)164.

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36

Shao, Hua-Sheng, e David d’Enterria. "gamma-UPC: automated generation of exclusive photon-photon processes in ultraperipheral proton and nuclear collisions with varying form factors". Journal of High Energy Physics 2022, n.º 9 (30 de setembro de 2022). http://dx.doi.org/10.1007/jhep09(2022)248.

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Abstract The automated generation of arbitrary exclusive final states produced via photon fusion in ultraperipheral high-energy collisions of protons and/or nuclei, A B $$ \overset{\upgamma \upgamma}{\to } $$ → γγ A X B, is implemented in the MadGraph5_aMC@NLO and HELAC-Onia Monte Carlo codes. Cross sections are calculated in the equivalent photon approximation using γ fluxes derived from electric dipole and charge form factors, and incorporating hadronic survival probabilities. Multiple examples of γγ cross sections computed with this setup, named gamma-UPC, are presented for proton-proton, proton- nucleus, and nucleus-nucleus ultraperipheral collisions (UPCs) at the Large Hadron Collider and Future Circular Collider. Total photon-fusion cross sections for the exclusive production of spin-0, 2 resonances (quarkonia, ditauonium, and Higgs boson; as well as axions and gravitons), and for pairs of particles (J/ψJ/ψ, WW, ZZ, Zγ, $$ t\overline{t} $$ t t ¯ , HH) are presented. Differential cross sections for exclusive dileptons and light-by-light scattering are compared to LHC data. This development paves the way for the upcoming automatic event generation of any UPC final state with electroweak corrections at next-to-leading-order accuracy and beyond.

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37

Tumasyan, A., W. Adam, J. W. Andrejkovic, T. Bergauer, S. Chatterjee, M. Dragicevic, A. Escalante Del Valle et al. "Measurement of the electroweak production of Zγ and two jets in proton-proton collisions at s=13 TeV and constraints on anomalous quartic gauge couplings". Physical Review D 104, n.º 7 (5 de outubro de 2021). http://dx.doi.org/10.1103/physrevd.104.072001.

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38

Tumasyan, A., W. Adam, J. W. Andrejkovic, T. Bergauer, S. Chatterjee, M. Dragicevic, A. Escalante Del Valle et al. "Measurement of the electroweak production of Zγ and two jets in proton-proton collisions at s=13 TeV and constraints on anomalous quartic gauge couplings". Physical Review D 104, n.º 7 (5 de outubro de 2021). http://dx.doi.org/10.1103/physrevd.104.072001.

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39

Aaboud, M., G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, S. H. Abidi et al. "Studies of Zγ production in association with a high-mass dijet system in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector". Journal of High Energy Physics 2017, n.º 7 (julho de 2017). http://dx.doi.org/10.1007/jhep07(2017)107.

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40

King, Simon J. D., Stephen F. King, Stefano Moretti e Samuel J. Rowley. "Discovering the origin of Yukawa couplings at the LHC with a singlet Higgs and vector-like quarks". Journal of High Energy Physics 2021, n.º 5 (maio de 2021). http://dx.doi.org/10.1007/jhep05(2021)144.

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Abstract Although the 125 GeV Higgs boson discovered at the LHC is often heralded as the origin of mass, it may not in fact be the origin of Yukawa couplings. In alternative models, Yukawa couplings may instead arise from a seesaw type mechanism involving the mixing of Standard Model (SM) chiral fermions with new vector-like fermions, controlled by the vacuum expectation value (VEV) of a new complex Higgs singlet field 〈Φ〉. For example, the largest third family (t, b) quark Yukawa couplings may be forbidden by a U(1)′ gauge or global symmetry, broken by 〈Φ〉, and generated effectively via mixing with a vector-like fourth family quark doublet (T, B). Such theories predict a new physical Higgs singlet ϕ, which we refer to as the Yukon, resulting from 〈Φ〉, in the same way that the Higgs boson h0 results from 〈H〉. In a simplified model we discuss the prospects for discovering the Yukon ϕ in gluon-gluon fusion production, with (t, b) and (T, B) quarks in the loops, and decaying in the channels ϕ → γγ, Zγ and ϕ → tT → tth0, ttZ. The potential for discovery of the Yukon ϕ is studied at present or future hadron colliders such as the LHC (Run 3), HL-LHC, HE-LHC and/or FCC. For example, we find that a 300–350 GeV Yukon ϕ could be accessed at LHC Run 3 in the di-photon channel in the global model, providing a smoking gun signature of the origin of Yukawa couplings. The tth0, ttZ channels are more involved and warrant a more sophisticated analysis.

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41

Aaboud, M., G. Aad, B. Abbott, O. Abdinov, B. Abeloos, D. K. Abhayasinghe, S. H. Abidi et al. "Measurement of the Zγ→νν¯γ$$ Z\gamma \to \nu \overline{\nu}\gamma $$ production cross section in pp collisions at s=13$$ \sqrt{s}=13 $$ TeV with the ATLAS detector and limits on anomalous triple gauge-boson couplings". Journal of High Energy Physics 2018, n.º 12 (dezembro de 2018). http://dx.doi.org/10.1007/jhep12(2018)010.

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