Two-proton Correlation Function and Final State Interaction

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Presentation transcript:

Two-proton Correlation Function and Final State Interaction Workshop on STAR TOF Two-proton Correlation Function and Final State Interaction Jingbo Zhang Harbin Institute of Technology Apr 28, 2009 Hangzhou

OUTLINE Motivation Two-proton Correlation Function AMPT Simulations @ RHIC low energy Pt-dependence of 2p HBT radii Summary

RHIC Beam Energy Scan Taken from P. Senger

Two-particle HBT Correlation xa xb pa pb

Excited Function of HBT Radii The source size at different energy has contracted experimentally from few GeV to 200GeV HIC

Two-proton Correlation Function The baryon source size is important to understand the energy density of the fireball. q (MeV/c) C(q) p-p correlation function

Final State Interaction (FSI) Two-particle Correlation Function with FSI For the two protons stand 1/4 at singlet state and 3/4 at triplet states, the modified correlation function can be written by

Final State Interaction (FSI) Considering FSI (Coulumn and Strong) FSI effects include by phase shifts Spherical Harmonic Function

HBT Correlation Function HBT Function, AMPT Au+Au events @5GeV

HBT Correlation Function (with FSI) 2πHBT, AMPT Au+Au events @5GeV

HBT Correlation Function (with FSI) 2pHBT, AMPT Au+Au events @5GeV

Pt-dependence of HBT Radii

Pt-dependence of HBT Radii

Pt-dependence of HBT Radii

Excited Function of 2p HBT Radii @ RHIC low energy

Summary The size dimension of proton source can be contracted by HBT Deal with the final state Interaction is the key to the two-proton HBT Difference with pt-dependence for proton and pion source. WHY? Critical point@RHIC energy scan? by 2pHBT? THANK YOU!