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重离子碰撞中直接光子的产生

重离子碰撞中直接光子的产生. 华中师范大学粒子物理研究所 刘复明： liufm@iopp.ccnu.edu.cn 合作者：朱燕、 T.Hirano 、 K.Werner. Motivations. PRL94,232301(2005)PRL96,202301(2006). R AA 高 Pt 区的行为 ? 对中心度的依赖？ 受哪些因素影响？. Sources of direct photons. pQCD leading order (LO) Thermal photons Fragmentation+Bremsstrahlung

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重离子碰撞中直接光子的产生

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  1. 重离子碰撞中直接光子的产生 华中师范大学粒子物理研究所 刘复明：liufm@iopp.ccnu.edu.cn 合作者：朱燕、T.Hirano、 K.Werner

  2. Motivations PRL94,232301(2005)PRL96,202301(2006) RAA 高Pt区的行为? 对中心度的依赖？ 受哪些因素影响？ 南京

  3. Sources of direct photons • pQCD leading order (LO) • Thermal photons • Fragmentation+Bremsstrahlung • Jet photon conversion Jet’s E-loss in plasma 南京

  4. Conpetition between sources 热光子主要贡献于小pt区，高pt区主要由 LO贡献。 Fragmentaion和JPC对LO有修正。 物理年会.南京

  5. Pt spectra for centralities PHENIX data: PRL94,232301(2005) J.Phys.G34:S1015,2007 理论结果在实验误 差范围内! 南京

  6. pp光子 南京

  7. RAA : data vs theory PHENIX data: PRL94,232301(2005) J.Phys.G34:S1015,2007 南京

  8. Centrality-dependence of Rcpand RAA 南京

  9. Isospin mixture + Nuclear shadowingRAA decreases at high pt 南京

  10. Effects from jet path: straight curly Longer path, more E-Loss, Fragm. and JPC suppressed. 南京

  11. T-dependent strong coupling • pQCD leading order (LO) • Fragmentation+Bremsstrahlung • Thermal photons • Jet photon conversion 南京

  12. Effect from stronger coupling 2*coupling, Thermal and JPC enhanced. More E-Loss, Frag. suppressed Totally a stronger suppression to RAA 南京

  13. 总结 • 热光子主要贡献于小pt区，高pt区主要由 LO贡献。Fragmentaion和JPC对LO有修正。 • 由于Isospin的混合和核shadowing， 直接光子的核修改因子在很高pt段比1小 • 喷注在QGP中的路径弯曲、QGP中的耦合常数 都会影响直接光子的产生 南京

  14. Thank you! 南京

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