Jet Discovery of Jet Quenching and Beyond Xin-Nian Wang LBNL, June 29, 05.

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Presentation transcript:

Jet Discovery of Jet Quenching and Beyond Xin-Nian Wang LBNL, June 29, 05

Discovery of Jet Quenching and Beyond Introduction: A brief history Jet quenching pattern and implications Beyond the discovery of jet quenching Xin-Nian Wang (LBNL) Shanghai, June 28-29, 2005 The 59 th Eastern Forum on Science and Technology

Jet Tomography Dynamic System: Photon or dilepton emission J/  suppression QCD Response:Quark scattering

A Chronicle of Jet Quenching 1982, Bjorken (unpublished): elastic dE/dx too small 1990,Gyulassy, Pluemer: Evoking inelastic dE/dx 1992, Gyulassy, XNW: Suppression of leading hadrons due to jet quenching 1994, Gyulassy, XNW: First calculation of radiative parton energy loss with LPM 1995, Gyulassy, Pluemer, XNW: Estimate of mono-jet rate in AA at RHIC 1996, Huang, Sarcevic, XNW: Medium modified fragmentation function & gamma tagged jet quenching 1996, Zakharov: Path integral formulation of dE/dx 1997, Baier et al: non-abelian LPM in QCD- interaction with gluonic clouds

A Chronicle- Con’ d 2000, XNW: First estimate of Cronin at RHIC 2000, Gyulassy, Levai, Vitev: Opacity expansion I. 2001, Wiedemann: Opacity expansion II 2001, Guo, XNW: Higher-Twist expansion and calculation of modified frag. function. 2001, XNW, GVW: high p T v 2 due to jet quenching 2002: Suppression of high p T hadron in Au+Au 2003: v 2 at high pt observed 2003: Suppression of back-side jet 2003, June 18: d+Au results announced 2004, azimuthal dependence of away-side jet 2005, angular correlations within jets

Jet Quenching Jet Quenching – Suppression of high p T jet in dense medium Experimentally: –Medium modification of jet fragmentation function (FF) –Suppression of the leading hadrons in FF Theoretically: –Parton energy loss before hadronization –Or absorption of leading hadrons from jets

Single Spectra Suppression Gluon Shadowing and Jet Quenching in A+A Collisions at \sqrt{s}=200 AGeV XNW and M. GyulassyPhys. Rev. Lett. 68, 1480 (1992) ETET

Away-side suppression or Mono-jet

Azimuthal Anisotropy Jet Quenching and Azimuthal Anisotropy of Large p T Spectra in Non-central High-energy Heavy-ion Collisions Phys. Rev. C 63, (2001)XNW

Non-suppression in p+A Systematic study of high p(T) hadron spectra in p p, p A and A A collisions from SPS to RHIC energies Phys. Rev. C 61, (2000) hep-ph/ , XNW

Experimental Evidence

Modified Fragmentation Function Modified splitting functions Guo & XNW’00 e-e-

Energy Loss Two-parton correlation: BDPM Gyulassy Vitev Levai Wang & Wang Wiedemann; Zakharov Quark energy loss = energy carried by radiated gluon

Single spectra in A+A collisions Participant Density Single spectra Dihadron spectra

Nuclear Modification Factor Initial state effect: Shadowing & pt broadening: XNW, PRC61(00) Fai, Papp, and Levai (02) Vitev & Gyulassy (02) Vitev (03) Color dipole model Kopeliovich et al (02) Alberto Accardi (01) Wang&Wang 2001

Single hadron suppression

Suppression of away-side jet

Azimuthal Anisotropy Single hadron Intermediate p T : effects of parton coalescence

Partonic Energy Loss at RHIC E=10 GeV Gyulassy & Vitev; Barnafoldi et al Muller Jeon et al Enke Wang & XNW’2000

Beyond the discovery I: Energy Dependence of quenching D. d’Enterria, Hard Probes GeV

Effect of non-Abelian energy loss Eg=EqEg=Eq  E g =2  E q Qun Wang & XNW ‘04

Beyond the Discovery II dihadron 20-60% STAR preliminary 20-60% Azimuthal Mapping of jet quenching

Beyond the discovery III: Measuring Parton Energy Loss ETET p T trig

STAR preliminary Beyond the discovery V: Mod. FF

Beyond the discovery IV: Abnormal angular distribution

Summary Discovery of Jet Quenching proves that dense matter is formed Jet quenching is caused by partonic energy loss Dense matter at RHIC is 30 times higher than cold nuclei The matter is strongly interactive Jet tomography become useful and power tool for studying properties of dense matter

Theoretical work in China Enke Wang, Benwei Zhang, Hanzhong Zhang, W.C. Xiang etc (IOPP, Wuhan) S.Y. Li, Z.G. Shi (Shandong Univ.) Qun Wang (USTC) Collaboration with experimental groups