1 Jet quenching, Nov. 2003 hep-ph/0310079; CERN-TH-2003-244.

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Presentation transcript:

1 Jet quenching, Nov hep-ph/ ; CERN-TH

2 During last VRVS meeting I suggested to look at

3

4 Higher p T jets are “more focused”

5

6 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Distribution of gluons radiated from initial hard parton  2 =k 2 / (mean p T 2 transferred from the medium to the projectile on the length L Soft gluons dominate and they populate small p T

7 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Observable Vacuum shapes from Fixed cone jet definitions in D0 and R(sep) Abbott, BAbbott, B- D0 Collaboration. FERMILAB-Pub E

8 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Calo granularity i.e. L=32 !?! Jet (not subjet) E resolution 50%/  E+2% for 50 GeV = 9% for 100 GeV = 7%

9 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A I have a “challenged” child and I know what it means

10 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Some optimism Partonic jet multiplicity is a new perspective …

11 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Upper limit of radiated gluons energy A visible broadening!

12 Medium Modification of Jet Shapes and Jet Multiplicities Salgado, C ASalgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Wiedemann, U A Pesimism? Optimism? A challenge …

13 But we will always have some averaging … T A (b).T B (b) driving the probability of a jet creation Pb T A (b)+T B (b) driving the density of the medium (no expansion here)

14 Some references A Dynamical Scaling Law for Jet Tomography /Salgado, C A; Wiedemann, U A hep-ph/ ; CERN-TH Geneva : CERN, 18 Apr p Published in: Phys. Rev. Lett. 89 (2002) /1-4Salgado, C AWiedemann, U A Phys. Rev. Lett. 89 (2002) /1-4 On the Angular Dependence of the Radiative Gluon Spectrum /Baier, R; Dokshitzer, Yu L; Müller, A H; Schiff, D hep-ph/ ; Published in: Phys. Rev., C 64 (2001) Baier, RDokshitzer, Yu LMüller, A HSchiff, DPhys. Rev., C 64 (2001) Energy Loss of Hard Partons in Nuclear Matter /Wiedemann, Urs A hep-ph/ ; 30 Mar Published in: Nucl. Phys., A 698 (2002) Wiedemann, Urs ANucl. Phys., A 698 (2002) Jet Quenching versus Jet Enhancement : a Quantitative Study of the BDMPS-Z Gluon Radiation Spectrum /Wiedemann, Urs A hep-ph/ ; Published in: Nucl. Phys., A 690 (2001) Wiedemann, Urs ANucl. Phys., A 690 (2001) Gluon Radiation off Hard Quarks in a Nuclear Environment : Opacity Expansion /Wiedemann, Urs A hep-ph/ ; Published in: Nucl. Phys., B 588 (2000) ….Wiedemann, Urs ANucl. Phys., B 588 (2000) Hard Probes in Heavy Ion Collisions at the LHC: Jet Physics /Accardi, A et al. hep-ph/ ; 23 Oct pAccardi, A