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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. 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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  1. Multiple Parton Scattering and Modified Fragmentation Functions in medium Wei-Tian Deng Shandong University Xin-Nian Wang LBNL & Shandong University

  2. Outline • Introduction • Shower parton distributions and energy loss in “Brick” • Modified fragmentation function in DIS • Summary and outlook

  3. Introduction:Medium-Modified DGLAP

  4. 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

  5. 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)

  6. 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)

  7. HKN parameterization Initial Conditions

  8. in Uniform Finite Medium (the “Brick” Problem)

  9. Test of This Method: Momentum Sum Rule The violation of the sum rule: The sum-rule is satisfied well

  10. Medium Induced Energy Loss of a Valence Quark LPM

  11. Gluon distribution in the shower of a Quark jet Sea quark distribution in the shower of a Quark jet

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

  13. Gluon distribution in the shower of a Gluon jet Valence Quark distribution in the shower of a Quark jet

  14. From Ideal “Brick” to Realistic Nuclear Medium

  15. Averaged mFF in DIS

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

  17. For Heavy Ion Collisions in RHIC energy, we get the preliminary value of . Cooperate with Ning-Bo Chang

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