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Artigos de revistas sobre o tema "Moment angulaire orbital des quarks"

Autor: Grafiati

Publicado: 5 de outubro de 2024

Última modificação: 31 de julho de 2025

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1

Weng, Zi-Hua. "Spin angular momentum of proton spin puzzle in complex octonion spaces." International Journal of Geometric Methods in Modern Physics 14, no. 07 (2017): 1750102. http://dx.doi.org/10.1142/s021988781750102x.

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The paper focuses on considering some special precessional motions as the spin motions, separating the octonion angular momentum of a proton into six components, elucidating the proton angular momentum in the proton spin puzzle, especially the proton spin, decomposition, quarks and gluons, and polarization and so forth. Maxwell was the first to use the quaternions to study the electromagnetic fields. Subsequently the complex octonions are utilized to depict the electromagnetic field, gravitational field, and quantum mechanics and so forth. In the complex octonion space, the precessional equili

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2

MIRJALILI, ABOLFAZL, KIANOOSH KESHAVARZIAN, and MOHAMMAD MEHDI YAZDANPANAH. "FLAVOR AND SPIN DEPENDENT STRUCTURE OF THE NUCLEON AND MESON." International Journal of Modern Physics A 27, no. 01 (2012): 1250003. http://dx.doi.org/10.1142/s0217751x12500030.

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We employ the polarized chiral constituent quarks to extract the polarized structure function of the nucleon. The polarized valon model is used to calculate the spin dependence of parton distribution functions of meson. The connection between the polarized structure of the proton and the Goldstone bosons, using the chiral quark model (χQM) is analyzed and the spin dependence of the parton distribution functions for pion and kaon, is obtained thoroughly. These functions are evolved to high Q2 values, using the singlet, nonsinglet and quark–gluon moments (ΔMS, ΔMNS, ΔMgq) which are convoluted wi

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3

SONG, XIAOTONG. "QUARK ORBITAL ANGULAR MOMENTUM IN THE BARYON." International Journal of Modern Physics A 16, no. 22 (2001): 3673–97. http://dx.doi.org/10.1142/s0217751x01005018.

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Analytical and numerical results, for the orbital and spin content carried by different quark flavors in the baryons, are given in the chiral quark model with symmetry breaking. The reduction of the quark spin, due to the spin dilution in the chiral splitting processes, is transferred into the orbital motion of quarks and antiquarks. The orbital angular momentum for each quark flavor in the proton as a function of the partition factor κ and the chiral splitting probability a is shown. The cancellation between the spin and orbital contributions in the spin sum rule and in the baryon magnetic mo

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4

Kostenko, Boris. "Quark-Parton Model and Relativistic Quantum Mechanics." EPJ Web of Conferences 173 (2018): 02012. http://dx.doi.org/10.1051/epjconf/201817302012.

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An attempt to treat the asymptotic freedom and the quark confinement as a self-consistent problem in the framework of relativistic quantum mechanics is realized. It is shown that the confinement of quarks induces a change of their helicities together with a simultaneous alteration of orbital momenta, so that the total angular momentum of each quark is conserved. This observation may cast light on the so-called proton spin puzzle after some additional numerical estimations.

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5

Lorcé, Cédric. "Quark Spin-Orbit Correlations." International Journal of Modern Physics: Conference Series 37 (January 2015): 1560036. http://dx.doi.org/10.1142/s2010194515600368.

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The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark

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6

Wakamatsu, Masashi. "Is gauge-invariant complete decomposition of the nucleon spin possible?" International Journal of Modern Physics A 29, no. 09 (2014): 1430012. http://dx.doi.org/10.1142/s0217751x14300129.

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Is gauge-invariant complete decomposition of the nucleon spin possible? Although it is a difficult theoretical question which has not reached a complete consensus yet, a general agreement now is that there are at least two physically inequivalent gauge-invariant decompositions (I) and (II) of the nucleon. In these two decompositions, the intrinsic spin parts of quarks and gluons are just common. What discriminate these two decompositions are the orbital angular momentum parts. The orbital angular momenta of quarks and gluons appearing in the decomposition (I) are the so-called "mechanical" orb

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7

Pruvost, Laurence, and Thierry Ruchon. "Vortex optiques en interaction avec des atomes." Reflets de la physique, no. 75 (April 2023): 10–16. http://dx.doi.org/10.1051/refdp/202375010.

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Un vortex optique est un faisceau laser dont le front d’onde est hélicoïdal. Il est donc chiral, d’hélicité gauche ou droite selon le sens de l’hélice. En plus du moment angulaire de spin qui correspond à la polarisation, les photons possèdent aussi un moment angulaire orbital (OAM) qui est quantifié et caractérise l'hélicité du vortex. L’interaction non linéaire de vortex optiques avec des atomes conduit à l’échange d’OAM avec l‘ensemble atomique et la génération de nouveaux vortex. Les propriétés quantiques de ces vortex sont une ressource exploitable dans le cadre des technologies quantique

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8

Liu, Keh-Fei. "Quark and Glue Components of the Proton Spin from Lattice Calculation." International Journal of Modern Physics: Conference Series 40 (January 2016): 1660005. http://dx.doi.org/10.1142/s2010194516600053.

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The status of lattice calculations of the quark spin, the quark orbital angular momentum, the glue angular momentum and glue spin in the nucleon is summarized. The quark spin calculation is recently carried out from the anomalous Ward identity with chiral fermions and is found to be small mainly due to the large negative anomaly term which is believed to be the source of the ‘proton spin crisis’. We also present the first calculation of the glue spin at finite nucleon momenta.

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9

Iwasaki, Sachio, Makoto Oka, Kei Suzuki, and Tetsuya Yoshida. "Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields." International Journal of Modern Physics: Conference Series 49 (January 2019): 1960002. http://dx.doi.org/10.1142/s2010194519600024.

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The Hadronic Paschen-Back effect (HPBE) is a new phenomenon induced by the interplay between finite orbital angular momenta of hadrons and external strong magnetic fields. We review the HPBE in P-wave charmonia and show its mass spectra, deformed wave functions, and mixing ratios, which are evaluated by the constituent quark models in a magnetic field and the cylindrical Gaussian expansion method.

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10

JAFFE, ROBERT L. "OPEN QUESTIONS IN HIGH ENERGY SPIN PHYSICS." International Journal of Modern Physics A 18, no. 08 (2003): 1141–52. http://dx.doi.org/10.1142/s0217751x03014459.

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I describe a few of the most exciting open questions in high energy spin physics. After a brief look at (g - 2)μ and the muon electric dipole moment, I concentrate on QCD spin physics. Pressing questions include the interpretation of new asymmetries seen in semi-inclusive DIS, measuring the polarized gluon and quark transversity distributions in the nucleon, testing the DHGHY Sum Rule, measuring the orbital angular momentum in the nucleon, and many others which go beyond the space and time allotted for this talk.

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11

Brodsky, Stanley J., Alexandre Deur, Guy F. de Téramond, and Hans Günter Dosch. "Light-front holography and superconformal quantum mechanics: A new approach to hadron structure and color confinement." International Journal of Modern Physics: Conference Series 39 (January 2015): 1560081. http://dx.doi.org/10.1142/s2010194515600812.

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A primary question in hadron physics is how the mass scale for hadrons consisting of light quarks, such as the proton, emerges from the QCD Lagrangian even in the limit of zero quark mass. If one requires the effective action which underlies the QCD Lagrangian to remain conformally invariant and extends the formalism of de Alfaro, Fubini and Furlan to light-front Hamiltonian theory, then a unique, color-confining potential with a mass parameter [Formula: see text] emerges. The actual value of the parameter [Formula: see text] is not set by the model – only ratios of hadron masses and other had

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12

Dutt, Suneel, Arvind Kumar, and Harleen Dahiya. "Effective masses and magnetic moments of charmed baryons in asymmetric hot strange hadronic matter." Physical Review D 110, no. 11 (2024). https://doi.org/10.1103/physrevd.110.116003.

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In the present work, we have studied the masses and magnetic moments of spin−12+ and spin−32+ singly and doubly charmed baryons in the strange hadronic medium at finite temperature using the chiral SU(3) quark mean field model. The properties of baryons within the framework of the chiral SU(3) mean field model are defined in terms of constituent quark masses and energies, which are modified through the exchange of scalar fields σ, ζ, and δ and the vector fields ω, ρ, and ϕ. The scalar-isovector field, δ, and the vector-isovector field, ρ, contribute when the medium has finite isospin asymmetry

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13

Bijker, R., and E. Santopinto. "Unquenched quark model for baryons: Magnetic moments, spins, and orbital angular momenta." Physical Review C 80, no. 6 (2009). http://dx.doi.org/10.1103/physrevc.80.065210.

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14

Kovchegov, Yuri V., and Brandon Manley. "Orbital angular momentum at small x revisited." Journal of High Energy Physics 2024, no. 2 (2024). http://dx.doi.org/10.1007/jhep02(2024)060.

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Abstract We revisit the problem of the small Bjorken-x asymptotics of the quark and gluon orbital angular momentum (OAM) distributions in the proton utilizing the revised small-x helicity evolution derived recently in [1]. We relate the quark and gluon OAM distributions at small x to the polarized dipole amplitudes and their (first) impact-parameter moments. To obtain the OAM distributions, we derive novel small-x evolution equations for the impact-parameter moments of the polarized dipole amplitudes in the double-logarithmic approximation (summing powers of αs ln2(1/x) with αs the strong coup

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15

Burkardt, Matthias, and Gunar Schnell. "Anomalous magnetic moments and quark orbital angular momentum." Physical Review D 74, no. 1 (2006). http://dx.doi.org/10.1103/physrevd.74.013002.

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16

Bhattacharya, Shohini, Krzysztof Cichy, Martha Constantinou, et al. "Moments of axial-vector GPD from lattice QCD: quark helicity, orbital angular momentum, and spin-orbit correlation." Journal of High Energy Physics 2025, no. 1 (2025). https://doi.org/10.1007/jhep01(2025)146.

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Abstract In this work, we present a lattice QCD calculation of the Mellin moments of the twist-2 axial-vector generalized parton distribution (GPD), $$ \overset{\sim }{H}\left(x,\xi, t\right) $$ H ~ x ξ t , at zero skewness, ξ, with multiple values of the momentum transfer, t. Our analysis employs the short-distance factorization framework on ratio-scheme renormalized quasi-GPD matrix elements. The calculations are based on an N f = 2 + 1 + 1 twisted mass fermions ensemble with clover improvement, a lattice spacing of a = 0.093 fm, and a pion mass of m π = 260 MeV. We consider both the iso-vec

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17

Liu, Keh-Fei. "Status on lattice calculations of the proton spin decomposition." AAPPS Bulletin 32, no. 1 (2022). http://dx.doi.org/10.1007/s43673-022-00037-4.

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AbstractLattice calculations of the proton spin components is reviewed. The lattice results of the quark spin from the axial-vector current matrix element at ∼ 0.3−0.4 is smaller than those from the constituent quark models. This is largely due to the fact that the vacuum polarization contribution from the disconnected insertion is negative. Its connection with the anomalous Ward identity is clarified and verified numerically. This resolves the contentious issue in the “proton spin crisis.” The glue spin and angular momentum are found to be large and there is notable contribution from the quar

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18

Braguta, Victor V., Maxim N. Chernodub, Ilya E. Kudrov, Artem A. Roenko, and Dmitrii A. Sychev. "Negative Barnett effect, negative moment of inertia of the gluon plasma, and thermal evaporation of the chromomagnetic condensate." Physical Review D 110, no. 1 (2024). http://dx.doi.org/10.1103/physrevd.110.014511.

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We discuss the negativity of the moment of inertia of (quark-)gluon plasma in a window of “supervortical” range of temperatures above the deconfining phase transition, T≃(1…1.5)Tc, found recently in numerical Monte Carlo simulations by two independent methods. In our work, we confirm numerically that the origin of this effect is rooted in the thermal evaporation of the nonperturbative chromomagnetic condensate. We argue that the negative moment of inertia of gluon plasma indicates the presence of a novel effect, the negative spin-vortical coupling for gluons resulting in a negative gluonic Bar

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19

Schäfer, Wolfgang. "Impact parameter dependence of dilepton production: Wigner function approach and the role of photon polarizations." Proceedings of the International Workshop on the Physics of Ultra Peripheral Collisions, March 11, 2025. https://doi.org/10.17161/werm5m52.

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We revisit the Wigner function approach to the impact parameter dependent dilepton pair production developed in [M. Klusek-Gawenda, WS, A. Szczurek Phys. Lett. B 814 (2021) 136114]. We study the distribution of the angle between difference and sum of lepton transverse momenta, and show how it relates to the orbital angular momentum of leptons. The dependence on impact paramter is discussed, and we also present the different components of the Wigner function in the t-channel. A brief comparison to similar angular distributions in diffractive quark pair production will be presented.

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20

Upadhyay, Abhinaba, Arvind Kumar, Harleen Dahiya, and Suneel Dutt. "Magnetic moments of 1−/2 baryon resonances in strange hadronic matter at high densities." Progress of Theoretical and Experimental Physics, April 17, 2025. https://doi.org/10.1093/ptep/ptaf059.

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Abstract This work primarily focusses on determining the magnetic moments of $\frac{1}{2}^-$ baryon resonances in the presence of hot and dense hadronic matter. In the chiral SU(3) quark mean field model approach, we have essentially accounted for the effects on in-medium scalar meson fields to investigate the impact of high densities on the in-medium baryon masses and their constituent quarks. In light of chiral constituent quark model χCQM, we have calculated the magnetic moments of $\frac{1}{2}^-$ baryon resonances and scrutinized the effects due to its internal constituents: the valence qu

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21

Dodd, Adam. "Unacceptable Renewals." M/C Journal 3, no. 6 (2000). http://dx.doi.org/10.5204/mcj.1883.

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The object of mapping is to produce a "correct" relational model of the terrain. Its assumptions are that the objects in the world to be mapped are real and objective, and that they enjoy an existence independent of the cartographer; that their reality can be expressed in mathematical terms; that systematic observation and measurement offer the only route to cartographic truth; and that this truth can be independently verified. -- J. B. Harley, "Deconstructing the Map" Cartography, in its pragmatic operation under these assumptions, avoids almost all of the problems of representation with whic

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