Enke Wang (Institute of Particle Physics, Huazhong Normal University) I. Jet Quenching II. Modification of Hadron Fragmentation Function III.Jet Tomography of Strong Interaction Matter IV. An explanation of heavy quark energy loss puzzle V. Summary and Discussion Jet Quenching and Its effects in Strong Interaction Matter
50
Embed
Enke Wang (Institute of Particle Physics, Huazhong Normal University) I.Jet Quenching II.Modification of Hadron Fragmentation Function III.Jet Tomography.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Enke Wang (Institute of Particle Physics, Huazhong Normal University)
I. Jet Quenching
II. Modification of Hadron Fragmentation Function
III. Jet Tomography of Strong Interaction Matter
IV. An explanation of heavy quark energy loss puzzle
V. Summary and Discussion
Jet Quenching and Its effects in Strong Interaction Matter
I. Jet QuenchingRutherford experiment atom discovery of nucleus
SLAC DIS experiment e proton discovery of quarks
A-A collisions: Naturally provides jet and the QGP
Jet (hard probe) created by parton scattering before QGP is formed
– high transverse momentum
– calculable in pQCD
penetrating beam (jet) absorption or scattering pattern
QGP
Hard Probes of Quark Matter:
27 YEARS AGO
Brief History of Theoretical Research about Jet Quenching
1982: J. D. Bjoken: Fermilab-pub-82/59-THY Energy loss in elastic scattering
1992/1995: X.-N. Wang, M. Gyulassy: PRL68(92) 148, PRD45 (92)844, NPB420(94)583, PRD51(95)3436 Energy loss is dominated by gluon radiation
1995/1997: BDMPS (R. Baier, Yu. L. Dokshitzer, A. Mueller, S. Peigue, D.Schiff) :PLB345(95) 277, NPB478(96)577,NPB483(97)291,NPB484(97)265 Gluon multiple scattering and gluon radiation
2000: GLV(M. Gyulassy, P. Levai, I. Vitev): PRL85(00)5535, NPB594(01)371
Reason: Collective flow changes the poles of the propagator
Energy Loss vs. Flow Velocity
Average Flow Velocity and Effective Average Energy Loss
3D ideal Hydrodynamic simulation for 0-10% central events of Au-Au collisions at RHIC energy:
Average Flow Velocity:
Effective Average Energy Loss:
Numerical Results of Effective Average Energy Loss
3D ideal Hydrodynamic simulation for 0-10% central events of Au-Au collisions at RHIC energy
V. Summary and Discussion
1) Jet can be used as a hard probe to explore the QGP.
2) Jet quenching lead to modification of hadron fragmentation function, which result in the suppression of high transverse momentum spectra observed in experiment.
3) Different tomography picture of the QGP for single jet, dijet and gamma-jet: surface vs. volume emission.
4) New potential for the interaction of a hard jet with the parton target has been derived. Collective flow reduce significantly the dead cone from mass effect for heavy quark jet. Heavy quark energy loss increase obviously in the presence of collective flow. An explanation of heavy quark loss puzzle is given in the framework of jet quenching theory.
Discussion
1) Dihadron azimuthal correlations in head-on collisions in AMPT :
Talk this afternoon by Qingjun Liu
2) Multiple parton scattering and modified fragmentation function in medium : Talk this afternoon by Weitian Deng
3) Gamma-jet tomography of high-energy nuclear collisions in NLO pQCD :