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6 results on '"spin [p]"'

1. Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

Author

Karl Jansen, Giannis Koutsou, Kyriakos Hadjiyiannakou, Simone Bacchio, Constantia Alexandrou, Haralambos Panagopoulos, Jacob Finkenrath, Martha Constantinou, and Gregoris Spanoudes

Subjects
Quark, sea [quark], Particle physics, Nuclear Theory, nonperturbative [renormalization], High Energy Physics::Lattice, FOS: Physical sciences, mass [pi], 7. Clean energy, 01 natural sciences, pi: mass, Charm quark, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Renormalization, p: spin, sum rule: momentum, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Pion, High Energy Physics - Lattice, 0103 physical sciences, ddc:530, valence, Nuclear Experiment (nucl-ex), renormalization: nonperturbative, 010306 general physics, Nuclear Experiment, Physics, quark: sea, momentum [sum rule], flavor, Valence (chemistry), 010308 nuclear & particles physics, High Energy Physics - Lattice (hep-lat), High Energy Physics::Phenomenology, lattice field theory, gluon, Lattice QCD, spin [p], Gluon, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Sum rule in quantum mechanics, charm
Abstract

Physical review / D D D101(9), 094513 (2020). doi:10.1103/PhysRevD.101.094513, We evaluate the gluon and quark contributions to the spin of the proton using an ensemble of gauge configurations generated at physical pion mass. We compute all valence and sea quark contributions to high accuracy. We perform a nonperturbative renormalization for both quark and gluon matrix elements. We find that the contribution of the up, down, strange, and charm quarks to the proton intrinsic spin is 12∑q=u,d,s,cΔΣq+=0.191(15) and to the total spin ∑q=u,d,s,cJq+=0.285(45)(10). The gluon contribution to the spin is Jg=0.187(46)(10) yielding J=Jq+Jg=0.473(71)(14) confirming the spin sum. The momentum fraction carried by quarks in the proton is found to be 0.618(60) and by gluons 0.427(92), the sum of which gives 1.045(118) confirming the momentum sum rule. All scale and scheme dependent quantities are given in the MS¯ scheme at 2 GeV., Published by Inst.302363, Melville, NY

Published
2020

2. Final COMPASS results on the deuteron spin-dependent structure function gd1 and the Bjorken sum rule

Author

Adolph, C., Aghasyan, M., Augustyniak, W., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krämer, M., Kremser, P., Krinner, F., Austregesilo, A., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y.-S., Azevedo, C. D. R., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, Gerhard K., Marianski, B., Martin, A., Marzec, J., Badelek, B., Matoušek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Balestra, F., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W.-D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ball, M., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J.-C., Pereira, F., Pešek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Barth, J., Pochodzalla, J., Polyakov, V. A., Pretz, Jörg, Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Beck, R., Rossiyskaya, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Bedfer, Y., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Bernhard, J., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Akhunzyanov, R., Bicker, K., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Thiel, A., Tosello, F., Tskhay, V., Bielert, E. R., Uhl, S., Vauth, A., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, Malte Christian, Windmolders, R., Wolbeek, J. ter, Birsa, R., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Zink, A., COMPASS Collaboration, Bodlak, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Büchele, M., Chang, W.-C., Alexeev, M. G., Chatterjee, C., Chiosso, M., Choi, I., Chung, S.-U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Alexeev, G. D., Denisov, Oleg Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Duic, V., Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Amoroso, A., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Andrieux, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse-Perdekamp, M., Anfimov, N. V., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Anosov, V., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Augsten, K., Jörg, P., Kabuß, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., and Koivuniemi, J. H.

Subjects
perturbation theory [quantum chromodynamics], deep inelastic scattering [muon deuteron], cross section: ratio, sum rule: Bjorken, polarized target, muon deuteron: deep inelastic scattering, structure function: spin, momentum transfer dependence, COMPASS, energy [beam], beam: energy, scaling: Bjorken, hadronic [final state], renormalization, x-dependence, p: spin, polarization: asymmetry, axial [charge], helicity [quark], strong coupling, quark: helicity, ddc:530, quantum chromodynamics: perturbation theory, charge: axial, Bjorken [sum rule], structure function [deuteron], deuteron: structure function, coupling constant, CERN SPS, spin [p], Bjorken [scaling], kinematics, final state: hadronic, asymmetry [polarization], nucleon: spin, spin [nucleon], muon: polarized beam, ratio [cross section], spin [structure function], polarized beam [muon], statistical, experimental results
Abstract

Physics letters / B 769, 34-41 (2017). doi:10.1016/j.physletb.2017.03.018, Published by North-Holland Publ., Amsterdam

Published
2017

3. Recent results for the proton spin decomposition from lattice QCD

Author

Fernanda Steffens, Giannis Koutsou, Christian Wiese, Constantia Alexandrou, Alejandro Vaquero, Martha Constantinou, Christos Kallidonis, Karl Jansen, Kyriakos Hadjiyiannakou, and Haralambos Panagopoulos

Subjects
High Energy Physics::Lattice, Nuclear Theory, FOS: Physical sciences, lattice [quantum chromodynamics], nonperturbative, mass [pi], pi: mass, quark, p: spin, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), angular momentum [gluon], quark: flavor: 2, Proton spin crisis, quark: form factor, ddc:530, flavor: 2 [quark], quark: mass dependence, numerical calculations, Nuclear Experiment, Physics, form factor, Condensed matter physics, mass: twist [quark], High Energy Physics - Lattice (hep-lat), lattice field theory, Lattice QCD, Decomposition, form factor [quark], spin [p], mass dependence [quark], quark: mass: twist, High Energy Physics - Phenomenology, gluon: angular momentum, gauge field theory, quantum chromodynamics: lattice
Abstract

XXIV International Workshop on Deep-Inelastic Scattering and Related, Hamburg, Germany, 11 Apr 2016 - 15 Apr 2016 ; Proceedings of Science (DIS2016), 240(2016)., The exact decomposition of the proton spin has been a much debated topic, on the experimental as well as the theoretical side. In this talk we would like to report on recent non-perturbative results and ongoing efforts to explore the proton spin from lattice QCD. We present results for the relevant generalized form factors from gauge field ensembles that feature a physical value of the pion mass. These generalized form factors can be used to determine the total spin and angular momentum carried by the quarks. In addition we present first results for our ongoing effort to compute the angular momentum of the gluons in the proton., Published by SISSA, Trieste

Published
2016

4. GPDs from present and future measurements

Author

Kumericki, Kresimir and Mueller, Dieter

Subjects
sea [quark], generalized parton distribution, Physics, High Energy Physics::Phenomenology, FOS: Physical sciences, scattering [electron nucleus], spin [p], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), deeply virtual Compton scattering, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), distribution function [parton], Nuclear Experiment
Abstract

We report on the access of generalized parton distributions (GPDs) from deeply virtual Compton scattering (DVCS) measurements. We also point out that such measurements at a proposed high-luminosity electron-ion collider (EIC) provide insight in both the transverse distribution of sea quarks and gluons as well as the proton spin decomposition., Proc. of DIS 2012, 385 - 388; DESY-PROC-2012-02; ISSN 1435-8077

Published
2013
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5. Recent results of double helicity asymmetries from PHENIX

Author

Wolin, Scott

Subjects
Physics, 500 GeV-cms [200], Physics::Accelerator Physics, High Energy Physics::Experiment, interaction [p p], asymmetry [helicity], polarization [gluon], PHENIX, Nuclear Experiment, longitudinal [polarized beam], spin [p], Brookhaven RHIC Coll, experimental results
Abstract

The search for the gluon contribution to the proton spin, $\Delta G$, is critical to understanding the proton spin puzzle. The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) is able to directly probe gluon polarization using collisions between two polarized proton beams. $\Delta G$ is determined from the double longitudinal asymmetry, $A_{LL}$, for a final state to be observed between same and opposite sign helicity proton interactions. In this talk we will summarize the recent $A_{LL}$ measurements. At mid-rapidity, $|\eta| < 0.35$, we can probe $\Delta G$ in the Bjorken-x range $0.05 < x < 0.2$. At forward rapidity we can probe $\Delta G$ down to $x\sim (1-3) \times 10^{-3}$., Proc. of DIS 2012, 917 - 920; DESY-PROC-2012-02; ISSN 1435-8077

Published
2012

6. Determination of disconnected diagrams for flavor singlet matrix elements in full QCD

Author

Viehoff, Jochen

Subjects
singlet [flavor], Monte Carlo [numerical methods], fluctuation [vacuum state], SU(3) [gauge field theory], topological [charge], thesis, bibliography, Monte Carlo [numerical calculations], index theorem, spin [p], lattice [regularization], interpretation of experiments, sigma term [pi nucleon], correlation function, axial [coupling], lattice field theory [fermion]
Published
1999

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