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Mach cones induced by gamma-triggered jets in - High Energy

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					Mach cones induced by g-triggered jets in high-
        energy heavy-ion collisions

                          Hanlin Li
   Institute of Particle Physics, Huazhong Normal University

  Collaborator: Fuming Liu, Guo-liang Ma, Xin-Nian Wang, Yan Zhu

                     July,18-21,Hangzhou,China
                       PRL 106, 012301 (2011)
                                                                   1
    Outline


Introduction
  background and motivation

Some results from jet and medium
 interaction
Jets propagate in the uniform medium

Jet showers propagate in the expanding medium


Summary
                                                 2
      Jet quenching

                      leading                                 Leading
                      particle                                particle
    hadrons                              hadrons              suppressed
     q                                     q
                  q
                                                       q
 hadrons
           leading                    hadrons
           particle                              leading
                                                 particle
                                                 suppressed

p-p collision                    A-A collision




                                                                           3
         Motivation




             jet


     p                p             ?
                               Au+Au / p+p
Au                        Au   s = 200 GeV




                                             4
Theoretical ideas



  1,Conical flow
 a, Mach cone




b, Cerenkov gluon radiation




   2, Large angle gluon radiation
                                    5
 Theoretical ideas


3,Deflected jets

Markovian parton scattering (MPS)
model




                                    Charles B Chiu and Rudolph C.Hwa (2006)

4, Triangular flow,
   Hot spots … …


What is the origin of double peak in dihadron correlation?
                                                                        6
     Linear Boltzmann jet transport


                     1
p1  f1 ( p1 )         dp2  dp3  dp4  ( f1 f 2  f3 f 4 ) M1234
                                                                        2

                    2 E1
(2 ) 4  4 ( P  P2  P3  P4 )
                1



  f i ( pi )  1/(e pi u / T  1), (i  2)

  d
      M1234 /16 2 s 2
  dt                                              4                  4
                                        1                  1
               e  li /                              3                  3
   f (li ) 
                                                                2
                                              2                              7
             Spectra of recoiled parton for single scattering
             Jet moves along z-axis T  0.2GeV  2  1.0GeV 2
                                                D
                                                                   4
                                                        1
                                                                       3
       z
                                                               2

            p
   ⌒

   ⌒
    0            y                                                     E1=20GeV
                px2  p y
                        2
x   arctan(               )
                  pZ




           The scattered parton with high energy is much closer to jet
           propagation direction.
                                                                             8
         Collective motion induced by a jet travelling in uniform medium
          z




                  x
y




    r    x2  y 2




     Further scatterings of the recoiled partons inside the medium lead
     to a mach cone propagation of the energy and momentum density.        9
     Spectra of recoiled partons for multiple scattering




                                                 scattered   jet

The double-hump feature in the angular distribution of the recoiled
partons is significantly diminished and eventually disappears due to
diffusion via secondary scatterings.


                                                                         10
    Mach cone in hydro case

     X jet  ( x, y, z )  (4,0,0) fm


        x




  g
 ET  20GeV


The shape of the shock wake is distorted by the transverse
and longitudinal flow that is developed during the expansion
of the hot medium.                                             11
Jet shower & medium excitation deflection
              x                             x




Deflection OF both shower partons & medium excitation
                                                        12
      The distorted Mach cone & jet shower in (3+1)D hydro medium




  1                    1




Deflection BY both radial flow and density gradient.

                                                                    13
   The distorted Mach cone & jet shower in (3+1)D hydro medium




The amplitude of deflection should be stronger with larger cross
section.

                                                               14
     The distorted Mach cone & jet shower in (3+1)D hydro medium




x     2                                                          2
                                1
 1




The amplitude of deflection should be stronger with the jet’s
production place closer to surface of dense matter.

                                                                15
   Gamma-triggered hadron vs dihadron
Hanzhong Zhang, Jeseph F.Owens, EnkeWang & Xin-Nian Wang (2009)




                                                                  16
        Dihadron, gamma-hadron Correlation from AMPT




                                                     PRL 106, 012301 (2011)



The amplitudes of the double peaks in dihadron correlations are much
bigger than gamma-hadron correlations for a given value of parton
cross section.
                                                                    17
Thank you!




             18

				
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posted:3/29/2013
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