Presentation is loading. Please wait.

Presentation is loading. Please wait.

SQM06, Zhangbu Xu (BNL)1 Overview of charm production at RHIC Zhangbu Xu (BNL) Presentions: Xiaorong Wang, PHENIX (Forward muon) Yifei Zhang, STAR (mid-rapidity,

Published by Modified over 9 years ago

Similar presentations

Presentation on theme: "SQM06, Zhangbu Xu (BNL)1 Overview of charm production at RHIC Zhangbu Xu (BNL) Presentions: Xiaorong Wang, PHENIX (Forward muon) Yifei Zhang, STAR (mid-rapidity,"— Presentation transcript:

1 SQM06, Zhangbu Xu (BNL)1 Overview of charm production at RHIC Zhangbu Xu (BNL) Presentions: Xiaorong Wang, PHENIX (Forward muon) Yifei Zhang, STAR (mid-rapidity, muon, electron) Haibin Zhang, STAR (STAR overview) Adrew Glenn, PHENIX (PHENIX overview) Posters: Chen Zhong, STAR (Low-pt muon) H.D. Liu et al., nucl-ex/0601030 X. Dong, thesis, nucl-ex/0509011 All nice talks on data are Over I am offering my own view Thank the organizers

2 SQM06, Zhangbu Xu (BNL)2 Outline Charm Total Cross Sections Are we alone? What’s right and what’s wrong? Are lepton spectra sensitive to flow? Form Factors What scale? (30%, x3) Does it make senses? Color, flavor (dE/dx)? Is pp/FONLL off by 3—6 serious? Wild Speculations and Outlook M c  1.5 GeV>>T c,  QCD, M uds M/E>>0

3 SQM06, Zhangbu Xu (BNL)3 Are we alone? Can we confirm or rule out Cosmic Ray experiments (Pamir, Muon, Tian Shan) under similar conditions? Data provide reference for Au+Au data and J/psi from charm coalescence STAR >3x PYTHIA,pQCD Energy dependence  R and  F ? Need smaller errors to constrain pQCD and determine the effects in Cosmic Ray Showers Pamir, Nuovo Cim 24c (2001) 557; NPB 122(2003) 353c X. Dong USTC

4 SQM06, Zhangbu Xu (BNL)4 Pamir EM shower depth With charm Without charm XREC upgrade Pamir, Nuovo Cim 24c (2001) 557

5 SQM06, Zhangbu Xu (BNL)5 Muons on the Side Two techniques, Two Spectra Fluorescence vs Muon/scintillator What is the problem? Incorrect Model of Detector? Incorrect Model of Showers? Heavy Primaries? New Physics? A. Olinto, PANIC05

6 SQM06, Zhangbu Xu (BNL)6 Can we get rid of data points we don’t like? if the data points shouldn’t be there in the first place? R. Vogt

7 SQM06, Zhangbu Xu (BNL)7 What’s right and what’s wrong X. Dong (USTC) PH.D. Thesis

8 SQM06, Zhangbu Xu (BNL)8 CDF/ISR c  e Spectra CDF directy D measurement -- high pT hep-ex/0307080 X. Dong, Thesis, nucl-ex/0509011

9 SQM06, Zhangbu Xu (BNL)9 Discrepancy at RHIC? PHENIX, PRL 94, 082301(2005) dN e /dy[0.8<pT<4.0]/N coll Y.F. Zhang, H.B.Zhang, C. Zhong, SQM06

10 SQM06, Zhangbu Xu (BNL)10 Which part of the lepton spectrum is sensitive to  cc ? 90% 15% σ cc = 1.1  0.1  0.3 mb Change (n, ), Left: 0.16<pT (  ) <0.26, ±10% Right: pT(e)>1.0 GeV/c, x8

11 SQM06, Zhangbu Xu (BNL)11 Measure  cc vs sqrt(s) Propose to measure total cross sections with low-pt muons: CDF, ALICE, Energy Scans at STAR H.D. Liu et al.,nucl-ex/0601030 1)Constrains pQCD 2)Baseline for charm Coalescence Model 3)Test PBM thermal model x4 below STAR measurements

12 SQM06, Zhangbu Xu (BNL)12 Are they talking about the same thing? H.B. Zhang, Y.F. Zhang, C. Zhong SQM06 PHENIX, PRL 94, 082301(2005) consistent with N bin scaling! Produced at initial impact! Large values: pQCD J/psi coalescence No sensitive to FSI Dynamics FSI Dynamics

13 SQM06, Zhangbu Xu (BNL)13 Are lepton spectra sensitive to flow?  Electron spectra cannot disentangle different charm hadron shapes at low p T S. Batsouli, et al, Phys.Lett.B 557 (2003) 26 Electrons: Smearing in p T axis X. Dong QM05

14 SQM06, Zhangbu Xu (BNL)14 Preserve the Orientation for v2? B. Zhang nu-th/0502056 H. Va Hees hep-ph/0601166 v2 and other calculations shows sensitivity? Is it by accident?

15 SQM06, Zhangbu Xu (BNL)15 Charm Decay Form Factors PDG Form factor is different between PYTHIA and PDG Electron spectrum depends strongly on charm spectrum shape at pT~1—2 GeV/c H.D. Liu, nucl-ex/0601030 e c s u,d,ud

16 SQM06, Zhangbu Xu (BNL)16 Charm flows, but not quite as large S. Esumi: (Next session) Overview of non-photonic electron v2 BlastWave model-dependent fit shows sensitivity of electron spectrum to charm spectrum shape Likely, Freeze-out early with less flow H.B. Zhang, Y.F. Zhang AuAu Central , K, p AuAu Central charm hadron

17 SQM06, Zhangbu Xu (BNL)17 R AA of non-photonic electrons  Evidence of large heavy quark energy loss! STAR Highlight talk PHENIX, PRL96

18 SQM06, Zhangbu Xu (BNL)18 Flavor or Color factor? Radiative dE/dx and Radiation+Elasitic The bigger difference is gluon vs quarks charm vs u/d is quite small The biggest difference between  and charm R AA is due to gluon The ten thousand things rise and fall without cease– 道德经 http://www.actus.org/laotzu.html S. Wicks, nucl-th/0512076 dE/dx(g) ~=9/4 dE/dx(uds) pbar, p vs  dE/dx(c/b)<dE/dx(uds)

19 SQM06, Zhangbu Xu (BNL)19 Gluon vs light quarks dE/dx(g) ~=9/4 dE/dx(uds) pbar, p vs  dE/dx(c/b)<dE/dx(uds) STAR nucl-ex/0601033  from quarks, pbar (p) from gluons at pT~=10 GeV/c

20 SQM06, Zhangbu Xu (BNL)20 Pbar(p),  same suppression STAR Preliminary L.J. Ruan, WWND06 Same suppression

21 SQM06, Zhangbu Xu (BNL)21 First thing first! p+p (PHENIX,STAR)/FONLL=(3,5.7) Are we worried? What if charm is off, but bottom is correct Cacciari, PRL95 STAR |y|<1 PHENIX, X.R. Wang, SQM06

22 SQM06, Zhangbu Xu (BNL)22 Speculations Gluon and light quark have similar dE/dx –color-factor 9/4 doesn’t work for large dE/dx? But, I. Vitev hep-ph/0601010: dE/E(g)=50%, (q)=25% NLO underpredicts charm but predicts bottom correctly –Mc~ 1.5 GeV/c too small –Other processes? These will explain: pbar(p), pion,electron RAA

23 SQM06, Zhangbu Xu (BNL)23 Outlook Measure  cc by low-pt muons LHC, Tevetron and energy scan at RHIC Measure D,  c, and B separately and cleanly Explain why gluons and light quarks have same dE/dx Does pQCD dE/dx work all the way to pT(e)~=1 GeV/c?

24 SQM06, Zhangbu Xu (BNL)24 A same ending of charm production at RHIC?? Thanks to PBM Whatever the truth, Triumph over mistrust!

25 SQM06, Zhangbu Xu (BNL)25 Effects related to Open Charm Radiation Energy Loss Collision Energy Loss Dead Cone Effect Ter-Mikayelian Effect Transition Radiation Flow (radial & elliptic) (quark) Coalescence Death of “dead cone” Charm Resonance CGC All these happen at intermediate p T Emphasize on experimental measurements Down Up Down Up Down Up?

26 SQM06, Zhangbu Xu (BNL)26 Challenges to theory Current energy loss mechanisms can only account for part of strong suppression of R AA for electrons. N. Armesto et. al. private comm.M. Djordjevic, et. al. nucl-th/0507019 any beauty? X. Dong QM05

27 SQM06, Zhangbu Xu (BNL)27

Download ppt "SQM06, Zhangbu Xu (BNL)1 Overview of charm production at RHIC Zhangbu Xu (BNL) Presentions: Xiaorong Wang, PHENIX (Forward muon) Yifei Zhang, STAR (mid-rapidity,"

Similar presentations

Aug. 10-15, 2005, XXXV ISMD, Czech X.Dong, USTC 1 Open charm production at RHIC Xin Dong University of Science and Technology of China - USTC  Introduction.

Aug , 2005, XXXV ISMD, Czech X.Dong, USTC 1 Open charm production at RHIC Xin Dong University of Science and Technology of China - USTC  Introduction.
First Alice Physics Week, Erice, Dec 4  9, 2005 1 Heavy  Flavor (c,b) Collectivity at RHIC and LHC Kai Schweda, University of Heidelberg A. Dainese,

First Alice Physics Week, Erice, Dec 4  9, Heavy  Flavor (c,b) Collectivity at RHIC and LHC Kai Schweda, University of Heidelberg A. Dainese,
STAR Heavy Flavor Measurements in Heavy- ion Collisions 1 Outline :  Quarkonia Measurements in  p+p, d+Au and Au+Au collisions  Open Charm Measurement.

STAR Heavy Flavor Measurements in Heavy- ion Collisions 1 Outline :  Quarkonia Measurements in  p+p, d+Au and Au+Au collisions  Open Charm Measurement.
Fukutaro Kajihara (CNS, University of Tokyo) for the PHENIX Collaboration Heavy Quark Measurements by Weak-Decayed Electrons at RHIC-PHENIX.

Fukutaro Kajihara (CNS, University of Tokyo) for the PHENIX Collaboration Heavy Quark Measurements by Weak-Decayed Electrons at RHIC-PHENIX.
ISMD’05, Kromeriz, Aug 09  15, 2005 1 Heavy  Flavor (c,b) Collectivity – Light  Flavor (u,d,s) Thermalization at RHIC Kai Schweda, University of Heidelberg.

ISMD’05, Kromeriz, Aug 09  15, Heavy  Flavor (c,b) Collectivity – Light  Flavor (u,d,s) Thermalization at RHIC Kai Schweda, University of Heidelberg.
Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.

Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.
Charm hadron production at RHIC in combination model Motivation Quark combination model Results and discussions Summary 2008-9-20 JiNan China Tao Yao,

Charm hadron production at RHIC in combination model Motivation Quark combination model Results and discussions Summary JiNan China Tao Yao,
Dilepton Forum, GSI, Feb 27, 2007 Kai Schweda 1 Heavy-Flavor Production at RHIC Kai Schweda, University of Heidelberg / GSI Darmstadt.

Dilepton Forum, GSI, Feb 27, 2007 Kai Schweda 1 Heavy-Flavor Production at RHIC Kai Schweda, University of Heidelberg / GSI Darmstadt.
Identified particle transverse momentum distributions in 200 GeV Au+Au collisions at RHIC 刘海东 中国科技大学.

Identified particle transverse momentum distributions in 200 GeV Au+Au collisions at RHIC 刘海东 中国科技大学.
Heavy Quark Probes of QCD Matter at RHIC Huan Zhong Huang University of California at Los Angeles ICHEP-2004 Beijing, 2004.

Heavy Quark Probes of QCD Matter at RHIC Huan Zhong Huang University of California at Los Angeles ICHEP-2004 Beijing, 2004.
Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.

Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.
Physics of High Baryon Density,Trento, May 29  June 2, 2006 1 Charm with STAR Kai Schweda, University of Heidelberg A. Dainese, X. Dong, J. Faivre, Y.

Physics of High Baryon Density,Trento, May 29  June 2, Charm with STAR Kai Schweda, University of Heidelberg A. Dainese, X. Dong, J. Faivre, Y.
Xiaorong Wang, SQM 2006 1 Measurement of Open Heavy Flavor with Single Muons in pp and dAu Collisions at 200 GeV Xiaorong Wang for PHENIX collaboration.

Xiaorong Wang, SQM Measurement of Open Heavy Flavor with Single Muons in pp and dAu Collisions at 200 GeV Xiaorong Wang for PHENIX collaboration.
M. Djordjevic 1 Open questions in heavy flavor physics at RHIC Magdalena Djordjevic The Ohio State University.

M. Djordjevic 1 Open questions in heavy flavor physics at RHIC Magdalena Djordjevic The Ohio State University.
M. Djordjevic 1 Heavy quark energy loss puzzle at RHIC Magdalena Djordjevic The Ohio State University.

M. Djordjevic 1 Heavy quark energy loss puzzle at RHIC Magdalena Djordjevic The Ohio State University.
Winter Workshop on Nuclear Dynamics – San Diego, 16 Mar. 2006John Harris (Yale) Suppression of Non-photonic Electrons at High Pt John W. Harris Yale University.

Winter Workshop on Nuclear Dynamics – San Diego, 16 Mar. 2006John Harris (Yale) Suppression of Non-photonic Electrons at High Pt John W. Harris Yale University.
Rare particle production 1. strangeness 2. open charm 3. quarkonia.

Rare particle production 1. strangeness 2. open charm 3. quarkonia.
03/14/2006WWND2006 at La Jolla1 Identified baryon and meson spectra at intermediate and high p T in 200 GeV Au+Au Collisions Outline: Motivation Intermediate.

03/14/2006WWND2006 at La Jolla1 Identified baryon and meson spectra at intermediate and high p T in 200 GeV Au+Au Collisions Outline: Motivation Intermediate.
1 Zhangbu Xu Brookhaven National Laboratory Quarkonium measurements with STAR Outline: High-p T J/ results J/spectrum and flow J/h correlations The.

1 Zhangbu Xu Brookhaven National Laboratory Quarkonium measurements with STAR Outline: High-p T J/ results J/spectrum and flow J/h correlations The.
Zhangbu Xu, QM08, Jaipur, India 1 Identified hadron spectra at high-p T 1.Basic properties of QCD relevant to us 2.Fragmentation Function in e + e - and.

Zhangbu Xu, QM08, Jaipur, India 1 Identified hadron spectra at high-p T 1.Basic properties of QCD relevant to us 2.Fragmentation Function in e + e - and.

Similar presentations

Ads by Google