publication . Article . Other literature type . Preprint . 2015

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

S. Dalla Torre; G. Sbrizzai; F. Bradamante; E. M. Kabuß; W. Eyrich; D.V. Peshekhonov; M. Quaresma; J.-C. Peng; V.N. Kolosov; C.D.R. Azevedo; ...
Open Access English
  • Published: 11 Sep 2015
  • Publisher: HAL CCSD
Abstract
We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g ...
Subjects
arXiv: Nuclear ExperimentHigh Energy Physics::ExperimentNuclear Theory
free text keywords: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], COMPASS; Deep inelastic scattering; Double spin asymmetry; High pT; δG; Nuclear and High Energy Physics, Nuclear and High Energy Physics, Particle Physics - Experiment, COMPASS, Double spin asymmetry, High pT, ΔG, High Energy Physics - Experiment, High Energy Physics - Phenomenology, QC1-999, Nuclear physics, Particle physics, Spin-½, Muon, Gluon, Photon, Nucleon, Hadron, Proton, Deep inelastic scattering, Physics
Funded by
EC| HADRONPHYSICS3
Project
HADRONPHYSICS3
Study of Strongly Interacting Matter
  • Funder: European Commission (EC)
  • Project Code: 283286
  • Funding stream: FP7 | SP4 | INFRA
30 references, page 1 of 2

[1] C.A. Aidala, S.D. Bass, D. Hasch, G.K. Mallot, Rev. Mod. Phys. 85 (2013) 655.

[2] COMPASS Collaboration, C. Adolph, et al., Phys. Lett. B 753 (2016) 18-28, http:// dx.doi.org/10.1016/j.physletb.2015.11.064, arXiv:1503.08935.

[3] SMC Collaboration, B. Adeva, et al., Phys. Rev. D 70 (2004) 012002.

[4] COMPASS Collaboration, E.S. Ageev, et al., Phys. Lett. B 633 (2006) 25.

[5] HERMES Collaboration, A. Airapetian, et al., J. High Energy Phys. 08 (2010) 130.

[6] COMPASS Collaboration, C. Adolph, et al., Phys. Lett. B 718 (2013) 922.

[7] COMPASS Collaboration, C. Adolph, et al., Phys. Rev. D 87 (2013) 052018.

[8] STAR Collaboration, L. Adamczyk, et al., Phys. Rev. D 89 (2014) 012001.

[9] PHENIX Collaboration, A. Adare, et al., Phys. Rev. D 90 (2014) 012007.

[10] PHENIX Collaboration, A. Adare, et al., Phys. Rev. D 84 (2011) 012006.

[11] STAR Collaboration, L. Adamczyk, et al., Phys. Rev. Lett. 115 (2015) 092002.

[12] COMPASS Collaboration, M. Stolarski, A new LO extraction of gluon polarisation from COMPASS DIS data, in: Proceedings, 22nd International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2014), PoS DIS2014 (2014), http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=203. [OpenAIRE]

[13] D. de Florian, R. Sassot, M. Stratmann, W. Vogelsang, Phys. Rev. Lett. 113 (2014) 012001.

[14] B. Jäger, M. Stratmann, W. Vogelsang, Eur. Phys. J. C 44 (2005) 533.

[15] C. Hendlmeier, M. Stratmann, A. Schäfer, Eur. Phys. J. C 55 (2008) 597.

30 references, page 1 of 2
Any information missing or wrong?Report an Issue