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Shadowing & quenching two stories in nuclear colliding

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Presentation on theme: "Shadowing & quenching two stories in nuclear colliding"— Presentation transcript:

1 Shadowing & quenching two stories in nuclear colliding
Weitian Deng High Energy Physics Group, Shandong University

2 Prelusion Energy dependence of the total cross section
Particle production in high energy hadron collisions two-component model

3 Prelusion P+P

4 Prelusion A+A NPDF (Nuclear Parton Distribution Function)

5 The shadowing legend nucl-th/

6 The shadowing legend

7 The shadowing legend Free proton PDFs: CTEQ, MRST, GRV,… Nuclear PDFs:
1. HKN, HKM (Hirai, Kumano, Nagai, Miyama) [hep-ph/ ,hep-ph/ ] 2. nDS (de Florian, Sassot) [hep-ph/ ] 3. EKS98 (Eskola, Kolhinen, Ruuskanen, Salgado) [hep-ph/ ,hep-ph/ ] - 1st global analysis for nPDFs - very good fits to nuclear DIS & DY data obtained 1. HKN, HKM (Hirai, Kumano, Nagai, Miyama) - automated chi2 minimization - uncertainty estimates 2. nDS (de Florian, Sassot) - first NLO global analysis for nPDFs 3. EKS98 (Eskola, Kolhinen, Ruuskanen, Salgado) - 1st global analysis for nPDFs - very good fits to nuclear DIS & DY data obtained with sum rules imposed – it works!

8 The data used DIS: l+A SLAC-E-139 NMC 95, 95re, 96 E665 Drell-Yan in p+A E772 E866 #datapoints = 514

9 HEP-PH / Dependence on x and A

10 HEP-PH / Dependence on x and Q^2

11 The shadowing legend Shadowing dependence on Impact-parameter b
Transverse momentum cut-off dependence on b

12 The shadowing legend Nucl-ex/0201005
This is the last slide of shadowing!!

13 The quenching melodrama
Pedestal&flow subtracted Initial state? Final state?

14 The quenching melodrama
<Nbinary>/sinelp+p nucleon-nucleon cross section Nuclear Modification Factor: If R = 1 here, nothing new going on

15 The quenching melodrama
(A+A)/(d+A)

16 The quenching melodrama
Different energies and centrality dependence 200 GeV |h| < 0.5 62 GeV |h| < 0.5 62 GeV 0.5 < |h| < 0.9

17 The quenching melodrama
RCP : Centrality dependence 62 GeV |h| < 0.5 62 GeV 0.5 < |h| < 0.9 200 GeV |h| < 0.5

18 The quenching melodrama
Final state interactions responsible for “jet quenching” instead of initial states. hadronization Final state? shower Splitting function

19 The quenching melodrama
Corrected Splitting Function

20 The quenching melodrama

21 The quenching melodrama

22

23 The quenching melodrama
The quenching function seems reasonable. However, has no power enough to suppress the ratio.

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