Jet-photon conversion with energy loss in Heavy Ion Collisions

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Presentation transcript:

Jet-photon conversion with energy loss in Heavy Ion Collisions Li-juan Zhou Institute of Particle Physics Central China Normal Univeristy Thanks to my collaborators: Enke Wang , Ben-Wei Zhang and Hanzhong Zhang 2019/7/25 Lijuan-Zhou CCNU

Outline Motivation Introduction to photon measurement Jet-photon conversion with energy loss Conclusion 2019/7/25 Lijuan-Zhou CCNU

Motivation for photon measurement Don’t interact strongly, long mean free path. The photon production rate and the photon momentum distribution depend on the momentum distributions of the quarks, antiquarks, and gluons in the plasma. 2019/7/25 Lijuan-Zhou CCNU

Photon sources in PP collisions Direct photons: Fragmentations Decay photons: , etc. Annihilation q + q   + g Compton q + g   + q 2019/7/25 Lijuan-Zhou CCNU

Photon sources in AA collisions 2019/7/25 Lijuan-Zhou CCNU

Direct photon RAA Nuclear modification factor RAA of very high-pT direct photons is below one. A hint of jet-quenching effect for fragmentation photons F. Arleo, JHEP 0609 (2006) 015 2019/7/25 Lijuan-Zhou CCNU

Direct photon RAA T.Isobe for the PHENIX Collaboration in nucl-ex/0701040 points out that Jet-photon conversion is not taken into account in the calculation of F. Arleo, JHEP 0609 (2006) 015 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion Jet-photon conversion is an important source for AA collisions: R.J.Fries, B.Muller and D.K.Srivastava PRL 90, 132301 (2003) Hard scattered parton interacts with gluon in bulk matter 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion The phase-space distribution for quark jet (Z.Lin and M.Gyulassy, Phys. Rew. C 51,2177(1995)): Satisfied: 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion The results for Annihilation and Compton scattering: The final expression for the jet-photon conversion: 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion PRL 90, 132301 (2003) Calculation indicate that the Jet-photon conversion is an important process in ! 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion Our work 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion The energy loss per unit length : (Enke Wang and Xin-Nian Wang, PRL87(2001)142301) 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion 2019/7/25 Lijuan-Zhou CCNU

Jet-photon conversion The results consistent with the calculation of PRC 72, (2005) 014906 2019/7/25 Lijuan-Zhou CCNU

Conclusion Jet-photon conversion is an important source for AA collisions: High-pT (> 6 GeV/c) photons are dominantly produced in hard scattering (jet-photon conversion) The jet quenching effect will decrease the rate of jet -photon conversion in high momentum The jet-photon conversion would provide information about energy loss 2019/7/25 Lijuan-Zhou CCNU

Thanks! 2019/7/25 Lijuan-Zhou CCNU