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Jet-photon conversion with energy loss in Heavy Ion Collisions

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Presentation on theme: "Jet-photon conversion with energy loss in Heavy Ion Collisions"— Presentation transcript:

1 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

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

3 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

4 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

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

6 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

7 Direct photon RAA T.Isobe for the PHENIX Collaboration in
nucl-ex/ 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

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

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

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

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

12 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

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

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

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

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

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

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

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

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

21 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

22 Thanks! 2019/7/25 Lijuan-Zhou CCNU

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