运用微扰QCD讨论了重离子碰撞中大横动量轻子对的分布,计算了Au-Au碰撞中两个部分子产生的轻子对的贡献.引入了轻子对产生的直接单光子过程和分解单光子过程.大横动量情况下的所有过程都包括在内,而且考虑了核遮蔽效应和同位旋效应,作为QGP背景的双轻子信号有了一个好的修正.
The large transverse momentum distribution of lepton pairs produced in heavy-ion collisions has been studied, making use of the perturbative QCD. The contribution of the two-parton production process into lepton pairs in Au-Au collisions is calculated. Lepton pair production with the direct single photon process and the resolved single photon process are introduced. We believe that the photon processes are significant. The complete processes at large transverse momentum are included, and moreover, the effect of shadowing and isospin of nucleus are also considered in heavy-ion collisions. Dilepton signals to regard the background of QGP have a good correction.
参考文献
| [1] | Alam J,Srivastava D K,Sinha B,et al.Phys Rev,1993,D48:1117. |
| [2] | Kapusta J,Lichard P,Seibert D.Nucl Phys,1992,A544:485. |
| [3] | Hung C M,Shuryak E.Phys Rev,1998,C57:1891. |
| [4] | Kapusta J,Lichard P,Seibert D.Phys Rev,1991,D44:2774. |
| [5] | Srivastava D K,Sinha B.Phys Rev Lett,1994,73:2421. |
| [6] | Chatterjee R,Frodermann E S,Heinz U W,et al.Phys Rev Lett,2006,96:202302. |
| [7] | Jeon S,Marian J J,Sarcevic I.Nucl Phys,2003,A715:795. |
| [8] | Kolb P F,Sollfrank J,Heinz U W.Phys Rev,2000,C62:054909. |
| [9] | Adler S S,Afanasiev S,Aidala C,et al (PHENIX Collaboration).Phys Rev Lett,2003,91:072301. |
| [10] | Fu Yongping,Li Yunde.Chin Phys Lett,2009,26(11):111201. |
| [11] | Kang Zhongbo,Qiu Jianwei,Vogelsang Werner.arXiv:hepph/0907.4498v2,2009. |
| [12] | Adare A,Afanasiev S,Aidala C,et al(PHENIX Collaboration).arXiv:nucl-ex/0804.4168,2009. |
| [13] | Adare A,Afanasiev S,Aidala C,et al(PHENIX Collaboration).Phys Rev,2010,C81:034911. |
| [14] | Adcox K,Adler S S,Afanasiev S,et al(PHENIX Collaboration).Nucl Phys,2005,A757:184. |
| [15] | Kang Zhongbo,Qiu Jianwei,Vogelsang Werner.Phys Rev,2009,D79:054007. |
| [16] | Aurenche P,Baier R,Fontannaz M.Phys Lett,1988,B209:375. |
| [17] | Berger E L,Gordon L E,Klasen M.Phys Rev,1998,D58:074012. |
| [18] | Qiu J W,Zhang X F.Phys Rev,2001,D64:074007. |
| [19] | Berger E L,Qiu J W,Zhang X F.Phys Rev,2002,D65:034006. |
| [20] | Gluck M,Reya E,Vogt A.Z Phys,1992,C53:127. |
| [21] | Gluck M,Reya E,Schienbein I.arXiv:hep-ph/9903337v2,1999. |
| [22] | Field R D.Applications of Perturbative QCD.Canada:Addison-Wesley Publishing Company,1989,170-224. |
| [23] | Qiu J.Nucl Phys,1987,B291:746. |
| [24] | Fu Yongping,Li Yunde.Nuclear Physics Review,2010,27 (1):16.(傅永平,李云德.原子核物理评论,2010,27(1):16.) |
| [25] | Owens J F.Rev Mod Phys,1987,59:465. |
| [26] | Staig Pilar,Shuryak Edward.arXiv:nucl-th/1005.3531v1,2010. |
| [27] | Dahms T.arXiv:nucl-ex/0810.3040,2008. |
| [28] | Adare A,Afanasiev S,Aidala C,et al(PHENIX Collaboration).arXiv:nucl-ex/0912.0244,2009. |
| [29] | Antreasyan D,Becker U,Bellettini G,et al.Phys Rev Lett,1982,48:302. |
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