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Multiple Parton Scattering and Modified Fragmentation Functions in medium. Wei-Tian Deng Shandong University Xin-Nian Wang LBNL & Shandong University. Outline. Introduction Shower parton distributions and energy loss in “Brick” Modified fragmentation function in DIS Summary and outlook.

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multiple parton scattering and modified fragmentation functions in medium

Multiple Parton Scattering and Modified Fragmentation Functions in medium

Wei-Tian Deng

Shandong University

Xin-Nian Wang

LBNL & Shandong University

outline
Outline
  • Introduction
  • Shower parton distributions and energy loss in “Brick”
  • Modified fragmentation function in DIS
  • Summary and outlook
medium induced gluon radiation
Medium Induced Gluon Radiation

Hard parton travel through QCD medium

Suffer multiple parton scattering

The accepted explanation for Jet Quenching observed in RHIC

Induced gluon radiation

Reduce the energy and virtuality

modified ff due to double parton scattering

Modification to splitting function for quark:

Quark-gluon correlation distribution:

The generalized transport parameter

Modified FF due to Double Parton Scattering

Modification to FF:

X. F. Guo and X. N. Wang

Phys. Rev. Lett. 85, 3591(2000)

B. W. Zhang and X. N. Wang

Nucl. Phys. A 720, 429 (2003)

slide6

Modification to splitting function for gluon:

Medium-modified splitting function:

Resum Multiple scattering and induced gluon radiations.

numerically

medium-modified DGLAP (mDGLAP)

B. W. Zhang and X. N. Wang

Nucl. Phys. A 720, 429 (2003)

test of this method momentum sum rule
Test of This Method: Momentum Sum Rule

The violation of the sum rule:

The sum-rule is satisfied well

slide11

Gluon distribution in the shower of a Quark jet

Sea quark distribution in the shower of a Quark jet

slide13

Gluon distribution in the shower of a Gluon jet

Valence Quark distribution in the shower of a Quark jet

slide14

From Ideal “Brick” to

Realistic Nuclear Medium

summary and outlook
Summary and Outlook
  • Multiple parton scattering mDGLAP
  • The shower parton distribution function in uniform finite medium.
  • Modification factor in DIS.
slide20

For Heavy Ion Collisions in RHIC energy, we get the preliminary value of .

Cooperate with Ning-Bo Chang

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