1 / 21

To Those Who Perished in the 5.12 Earth Quake in China

To Those Who Perished in the 5.12 Earth Quake in China. Quark Propagation in a Nuclear Medium. Xin-Nian Wang LBNL. 4 Th Electron-Ion Collider Workshop Hampton, May 19-23, 2008. Medium Response Function. QCD Response:. Quark-medium scattering. Dynamic System: Photon or dilepton emission.

kaitlin-dennis
Download Presentation

To Those Who Perished in the 5.12 Earth Quake in China

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. To Those Who Perished in the 5.12 Earth Quake in China

  2. Quark Propagation in a Nuclear Medium Xin-Nian Wang LBNL 4Th Electron-Ion Collider Workshop Hampton, May 19-23, 2008

  3. Medium Response Function QCD Response: Quark-medium scattering Dynamic System: Photon or dilepton emission J/Y suppression

  4. Quark Propagation: Jet Quenching & Broadening parton hadrons E ph Suppression of leading particles Dh/a(z)=dN/dz (z=ph/E) Fragmentation Function dE/dx  modified frag. functions dN/d2kT Angular distribution <Dk2T>  jet broadening

  5. DIS off a large nucleus e- Loosely bound nucleus (p+, q- >> binding energy)

  6. Collinear Expansion Collinear expansion: Ward identities

  7. Collinear Expansion (cont’d) xp q xp x1p ‘Twist-3’ unintegrated quark distribution q ‘Twist-2’ unintegrated quark distribution =

  8. TMD (unintegrated) quark distribution Longitudinal gauge link Transverse gauge link Belitsky, Ji & Yuan’97

  9. Transport Operator Transport operator All in terms of collinear quark-gluon matrix elements Liang, XNW & Zhou’08 Taylor expansion

  10. Maximal Two-gluon Correlation

  11. Nuclear Broadening & Gluon Saturation Quark jet transport parameter Coherence effect  correlation between different nucleons Kochegov & Mueller’98 McLerran & Venugapolan’95 Gluon saturation Liang, XNW & Zhou’08

  12. SIDIS off Nuclei e- Frag. Func.

  13. DGLAP Evolution q q k1 k2 p p Splitting function

  14. Induced gluon emission in twist expansion q q xp xp x1p+kT Ap Ap Collinear expansion: Double scattering

  15. LPM Interference Formation time

  16. Modified Fragmentation Modified splitting functions Two-parton correlation: Guo & XNW’00

  17. Quadratic Nuclear Size Dependence

  18. HERMES data E. Wang & XNW PRL 2000 in Au nuclei

  19. Energy Dependence

  20. Jet quenching in heavy-ion collision single hadron dihadron in cold nuclei Central Au+Au in hot matter

  21. Summary • Quark transverse momentum distribution can be expressed in term collinear quark-gluon matrix elements • quark propagation in nuclei leads to kT broadening gluon correlation function • Jet transport parameter qhat  saturation scale Qsat2 • Modified fragmentation function  qhat~0.01 GeV^2/fm in HERMES at HERA versus qhat~ 1-2 GeV^2/fm in QGP at RHIC • qhat at small x and large Q^2 can reveal gluon dynamics (correlation, saturation) in nuclei

More Related