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Diagnosing energy loss: PHENIX results on high-p T hadron spectra Baldo Sahlmüller, University of Münster for the PHENIX collaboration.

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Presentation on theme: "Diagnosing energy loss: PHENIX results on high-p T hadron spectra Baldo Sahlmüller, University of Münster for the PHENIX collaboration."— Presentation transcript:

1 Diagnosing energy loss: PHENIX results on high-p T hadron spectra Baldo Sahlmüller, University of Münster for the PHENIX collaboration

2 Baldo SahlmüllerQuark Matter 20062 Physics Motivation: Why high-p T ? At high energy: hard scattering cross section large Measuring high p T particle yields: –Initial yields and p T distributions can be predicted from p+p measurements + pQCD + cold nuclear effects –Deviations can be attributed to the medium formed in A+A collisions High p T particles (leading particles of jets) as ,  0 can be measured in large BGs (dN ch /d  ~ 700) Quantification with nuclear modification factor: A+A p+p

3 Baldo SahlmüllerQuark Matter 20063 What we already know System size dependence at 200 GeV –Suppression up to high p T –Consistent with dN g /dy = 1200 (Au+Au) and dN g /dy = 370 (Cu+Cu) Questions: What happens at lower energies? Connection towards SPS energies? Similar suppression for similar N part - Consistent with pure density and path length dependence - also: taking into account shape of nuclei

4 Baldo SahlmüllerQuark Matter 20064 The PHENIX Experiment Measurement of ,  0 via  decay Decay  ’s are measured in EMCal –2 sectors PbGl, 6 sectors PbSc in 2 arms –Covers |  |<0.35,  =180° –Granularity fine enough to measure  0 ’s up to p T ~ 25 GeV/c ,  0

5 Baldo SahlmüllerQuark Matter 20065 Diagnosing Heavy Ion Collisions So far: status of investigating energy loss with high p T particle production; dependence on: CentralityOK p T OK System size (OK) => Next step: energy dependence

6 Baldo SahlmüllerQuark Matter 20066 200 GeV

7 Baldo SahlmüllerQuark Matter 20067 T The p+p Reference Measurement at 200 GeV nucl-ex/0610036 00  => See poster by A. Bazilevsky!

8 Baldo SahlmüllerQuark Matter 20068 nucl-ex/0610036 Initial State Effects? New PHENIX paper on centrality dependence of  0 +  in d+Au at 200 GeV d+Au as collision system to look for initial state effects => no strong initial state effects nucl-ex/0610036

9 Baldo SahlmüllerQuark Matter 20069 Au+Au at 200 GeV  data from RHIC run 2004 => See poster by M.L. Purschke!

10 Baldo SahlmüllerQuark Matter 200610 R AA at 200 GeV  in Au+Au => Suppression by a factor of 5 in central events

11 Baldo SahlmüllerQuark Matter 200611 R AA at 200 GeV Direct ,  0 and  in Au+Au –Direct  R AA with measured p+p reference! => R AA of  and  0 consistent, both show suppression => R AA of  is smaller than 1 at very high p T 0-10% central events

12 Baldo SahlmüllerQuark Matter 200612 62.4 GeV

13 Baldo SahlmüllerQuark Matter 200613 The p+p Reference p+p parameterization at 62.4 GeV: Fit to existing (ISR) data at similar energies (D.d'Enterria. J.Phys.G31, S491 (2005))

14 Baldo SahlmüllerQuark Matter 200614 The p+p Reference Problem: data sets inconsistent => large error  new important RHIC measurement in 2006  Analysis still ongoing

15 Baldo SahlmüllerQuark Matter 200615 Au+Au at 62.4 GeV Au+Au  0 : –Suppression in central events –Important: influence of error in p+p reference! –Theoretical curve: Vitev nucl-th/0404052 dN g /dy = 650-800

16 Baldo SahlmüllerQuark Matter 200616 Spectra in Cu+Cu at 62.4 GeV 00  => See poster by T. Sakaguchi!

17 Baldo SahlmüllerQuark Matter 200617 R AA in Cu+Cu at 62.4 GeV Cu+Cu  0 : centrality dependent Important: Influence of error in p+p reference! Centrality dependent behavior Enhancement in peripheral events R AA smaller in central events

18 Baldo SahlmüllerQuark Matter 200618 R AA vs. N part at 62.4 GeV R AA integrated at high p T Again: Large normalization uncertainty from p+p reference R AA smaller towards higher N part Same theoretical model as for 200 GeV data consistent within errors

19 Baldo SahlmüllerQuark Matter 200619 22.4 GeV

20 Baldo SahlmüllerQuark Matter 200620 The p+p Reference p+p parameterization at 22.4 GeV: Fit to existing data at similar energies (D.d'Enterria. J.Phys.G31, S491 (2005))

21 Baldo SahlmüllerQuark Matter 200621  0 at 22.4 GeV Towards SPS energies: Cu+Cu at 22.4 GeV Little centrality dependence

22 Baldo SahlmüllerQuark Matter 200622 SPS and RHIC Same behavior for similar N part (63 at WA98, 67.8 at PHENIX) Blattnig parameterization used for WA98 data (S. Blattnig et. al., Phys.Rev. D62 (2000) 094030 / D. D’Enterria, Phys. Lett. B 596 (2004) 32))

23 Baldo SahlmüllerQuark Matter 200623 R AA at Different Energies Comparison of  0 in Cu+Cu at 200, 62.4, and 22.4 GeV –Measured the same collision species over a broad energy range Suppression gets larger with higher energies

24 Baldo SahlmüllerQuark Matter 200624 Particle Ratio

25 Baldo SahlmüllerQuark Matter 200625 Ratio in Au+Au Ratio  /  0 for different centralities in comparison with PYTHIA prediction PYTHIA works very well in describing the ratio in heavy-ion collisions Possible conclusion (for high p T ): Suppression at partonic level, fragmentation outside medium

26 Baldo SahlmüllerQuark Matter 200626 Ratio in p+p and Cu+Cu Ratio  0 Approximately 0.5 at high p T First PHENIX  measurement at 62.4 GeV p+p Cu+Cu nucl-ex/0611006

27 Baldo SahlmüllerQuark Matter 200627 “World” data  All PHENIX data consistent with world data  Ratio shows no obvious energy dependence

28 Baldo SahlmüllerQuark Matter 200628 Data vs. Theory?

29 Baldo SahlmüllerQuark Matter 200629 Comparing to Theories How probable is a certain parameter in theory? Theory: Loizides, hep-ph/0608133v2 Taking into account errors of measurement (for a certain theory parameter): 1. vary points within 4 RMS of correlated errors, find most probable point 2. calculate probability for large number of randomly picked sets of correlated and uncorrelated errors 3. see how many of these are worse than point from step 1

30 Baldo SahlmüllerQuark Matter 200630 Comparing to Theories another compilation… Theory: I. Vitev, Phys.Lett.B639:38-45,2006

31 Baldo SahlmüllerQuark Matter 200631 Comparing to Theories and another compilation… Theory: William Horowitz

32 Baldo SahlmüllerQuark Matter 200632 Summary Au+Au at 200 GeV –New  measurement up to p T = 15 GeV/c –Similar suppression patterns of  and  0 Cu+Cu at 62.4 GeV –Strong  0 enhancement in peripheral events –R AA gets smaller in central events Cu+Cu at 22 GeV –No significant centrality dependence in  0 production –Consistent with SPS results at 17.3 GeV Ratio  0 –Ratio  0 similar for different collision systems and energies Results in Cu+Cu and Au+Au consistent with partonic energy loss in the medium, fragmentation in the vacuum

33 Baldo SahlmüllerQuark Matter 200633 Finally: Back to the List So far:status of investigating energy loss with high p T particle production; dependence on: –CentralityOK –p T OK –System size (OK)

34 Baldo SahlmüllerQuark Matter 200634 Finally: Back to the List Now:status of investigating energy loss with high p T particle production; dependence on: –CentralityOK –p T OK –System size OK –EnergyOK

35 13 Countries; 62 Institutions; 550 Participants* *as of March 2005

36 Baldo SahlmüllerQuark Matter 200636 Related Talks and Posters Talks –2.2.5 V. S. Pantuev PHENIX measurements of reaction plane dependence of high-p T photons and pions in Au+Au collisions –3.1.2 Yu. Riabov Measurement of leptonic and hadronic decays of  and  mesons at RHIC by PHENIX –3.2.2 M. Konno High-p T Identified Hadron Production in Au+Au and Cu+Cu Collisions at RHIC- PHENIX –3.3.1 T. Isobe Systematic Study of High-p T Direct Photon Production with the PHENIX Experiment at RHIC Posters –1.14 M. L. Purschke Measurement of  p T distributions in S NN =200 GeV Au-Au collisions at RHIC-PHENIX –1.18 V. Ryabov Measurements of the multi-hadron decays of  and  mesons in heavy ion collisions at S NN = 200 GeV in the PHENIX experiment at RHIC –2.38 M. Shimomura Measurement of Azimuthal Anisotropy for High-p T Charged Hadron at RHIC- PHENIX –2.50 T. Sakaguchi System size and energy dependence of high-p T hadron production measured with the PHENIX experiment at RHIC –2.51 D. Winter High-pT π 0 production with respect to the reaction plane in S NN = 200 GeV Au+Au collisions at PHENIX

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