We investigate the possibility to acquire information of nuclear generalized parton distribution (GPD) H by studying the deeply virtual Compton scattering (DVCS) off several nuclear targets at the HERMES group (Hadron-Electron Ring Accelerator Measurement of Spin). Two different models are used and developed to demonstrate the leading asymmetry amplitude ALUsinΦ for coherent-enriched and incoherent-enriched parts with both statistical and systematic uncertainties estimated. It is found that a clear enhancement of ratio of nuclear asymmetry ALUA,sinΦ to free proton asymmetry ALUH,sinΦ in the coherent-enriched region is expected by both models, and a decrease of the ratio in incoherent-enriched region; both give the information about nuclear modifications. It is also possible to distinguish between those two models even under the limited statistics.
We investigate the possibility to acquire information of nuclear generalized parton distribution (GPD) H by studying the deeply virtual Compton scattering (DVCS) off several nuclear targets at the HERMES group (Hadron-Electron Ring Accelerator Measurement of Spin). Two different models are used and developed to demonstrate the leading asymmetry amplitude ALUsinΦ for coherent-enriched and incoherent-enriched parts with both statistical and systematic uncertainties estimated. It is found that a clear enhancement of ratio of nuclear asymmetry ALUA,sinΦ to free proton asymmetry ALUH,sinΦ in the coherent-enriched region is expected by both models, and a decrease of the ratio in incoherent-enriched region; both give the information about nuclear modifications. It is also possible to distinguish between those two models even under the limited statistics.
(Spin dependence of cross sections; polarized beam experiments)
引用本文:
YE Hong-Xue;MAO Ya-Jun;WANG Si-Guang;SUN Bo. Calculation of Nuclear Deeply Virtual Compton Scattering in HERMES Experiment[J]. 中国物理快报, 2009, 26(1): 11301-011301.
YE Hong-Xue, MAO Ya-Jun, WANG Si-Guang, SUN Bo. Calculation of Nuclear Deeply Virtual Compton Scattering in HERMES Experiment. Chin. Phys. Lett., 2009, 26(1): 11301-011301.
[1] Dittes F M et al 1988 Phys. Lett. B 209 325 [2] D Muller et al 1994 Fortschr. Phys. 42 101 [3] Goeke K et al 2001 Prog. Part. Nucl. Phys. 47401 [4] Belitsky A V and Muller D 2002 Nucl. Phys. A 711 118 [5] Diehl M 2003 Phys. Rep. 388 41 [6] Ji X 1997 Phys. Rev. Lett. 78 610 [7] Leader E and Anselmino M 1988 Z. Phys. C 41239 [8] Adloff C et al [H1 Collaboration] 2001 Phys. Lett. B 517\,47 [9]Chekanov\,S\,et\,al [Zeus\,Collaboration]\,2003\, Phys.Lett.\,B\, 573\,46 [10] Airapetian A et al [HERMES Collaboration] 2001 Phys. Rev. Lett. 87 182001 [11] Airapetian A et al [HERMES Collaboration] 2007 Phys.Rev. D 75 011103(R) [12] Airapetian A et al [HERMES Collaboration] 2008 J.High Energy Phys. 06 066 [13] Mazouz M et al [JLab Hall A Collaboration] 2007 Phys. Rev. Lett. 99 242501 [14] Polyakov M V 2002 hep-ph/0211444 [15] Polyakov M V 1999 Nucl. Phys. B 555 231 [16] Polyakov M V and Shuvaev A G 2002 hep-ph/0207153 [17] Guzey V and Strikman M 2003 Phys. Rev. C 68015204 [18] Guzey V and Teckentrup T 2006 Phys. Rev. D 74054027 [19] Guzey V 2008 arXiv:0801.3235 [hep-ph] [20] Radyushkin A V 2001 At the Frontier of ParticlePhysics Handbook of QCD ed Shifman M (Singapore: World Scientific) vol2 p 1037 hep-ph/0101225 [21] Belitsky A V et al 2001 Phys. Rev. D 64116002 [22] Belitsky A V et al 2002 Nucl. Phys. B 629 323 [23] Lu D H et al 1998 Phys. Lett. B 417 217 [24] Stein S et al [E61 Collaboration] 1975 Phys. Rev. D 12 1884 [25] Carison J et al 2003 Phys. Lett. B 553 191 [26] Korotkov V A et al 2002 Eur. Phys. J. C 23455 [27] De Jager C W et al 1987 Atom. Data Nucl. DataTables 36 495 [28] Bacchetta A et al 2004 Phys. Rev. D 70 117504 [29] Ackerstaff K et al [HERMES Collaboration] 1998 Nucl. Instrum. Methods A 417 230
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