Multiple parton scattering and modified fragmentation functions in medium
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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

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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


Introduction medium modified dglap

Introduction:Medium-Modified DGLAP


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)


Multiple parton scattering and modified fragmentation functions in medium

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)


Initial conditions

HKN parameterization

Initial Conditions


In uniform finite medium the brick problem

in Uniform Finite Medium (the “Brick” Problem)


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


Medium induced energy loss of a valence quark

Medium Induced Energy Loss of a Valence Quark

LPM


Multiple parton scattering and modified fragmentation functions in medium

Gluon distribution in the shower of a Quark jet

Sea quark distribution in the shower of a Quark jet


Multiple parton scattering and modified fragmentation functions in medium

Quark (antiquark) distribution in the shower of a Gluon jet


Multiple parton scattering and modified fragmentation functions in medium

Gluon distribution in the shower of a Gluon jet

Valence Quark distribution in the shower of a Quark jet


Multiple parton scattering and modified fragmentation functions in medium

From Ideal “Brick” to

Realistic Nuclear Medium


Averaged mff in dis

Averaged mFF in DIS


Summary and outlook

Summary and Outlook

  • Multiple parton scattering mDGLAP

  • The shower parton distribution function in uniform finite medium.

  • Modification factor in DIS.


Multiple parton scattering and modified fragmentation functions in medium

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

Cooperate with Ning-Bo Chang


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