Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Tatsuya Chujo Univ. of Tsukuba Soft particle production at RHIC CNS-RIKEN workshop “Physics of QGP at RHIC” (Feb. 16, 2006)

Published byAnn Lane Modified over 8 years ago

Similar presentations

Presentation on theme: "1 Tatsuya Chujo Univ. of Tsukuba Soft particle production at RHIC CNS-RIKEN workshop “Physics of QGP at RHIC” (Feb. 16, 2006)"— Presentation transcript:

1 1 Tatsuya Chujo Univ. of Tsukuba Soft particle production at RHIC CNS-RIKEN workshop “Physics of QGP at RHIC” (Feb. 16, 2006)

2 2 Outline Single particle spectra –Hadron freeze-out Kinetic and chemical properties. Resonance production and time scale. –Hadron production at intermediate p T Baryon-meson effect. High statistics  meson data. Cu+Cu 200 GeV results and N part scaling. –d+Au experiment HBT two particle correlation –Systematics of HBT measurements and Hydro. –1D source imaging.

3 3 Space-Time Evolution of System 1. Hard scattering 2. Thermalization and QGP 3. Chemical freeze out (particle abundances fixed) 4.Kinetic freeze out (elastic Interactions cease) ♦Hadrons: interact strongly - can probe the evolution of the system and its medium effect. 4 1 3 2

4 4 p T spectra at RHIC

5 5   Strange baryon spectra 200 GeV Au+Au 62.4 GeV Au+Au

6 6 RHIC data set (2000 - 2005) –p+p @  s = 200 GeV (2001, 2003, 2005). –d+Au @  s NN = 200 GeV (2003). –A+Au @  s NN = 62.4 GeV(2004), 130 GeV (2000), 200 GeV (2001, 2004). –Cu+Cu @  s NN = 22.5, 62.4, 200 GeV (2005).

7 7 Hadron freeze-out properties 1.Kinetic freeze-out 2.Chemical freeze-out 3.Timescale between chemical and kinetic freeze-out

8 8 Semi-Inclusive soft particle spectra D.d'Enterria &D. Peressounko nucl-th/0503054 Au+Au 200 GeV central (b < 2.6 fm) Hydro QCD :  < K < p consistent with radial flow picture. 25% (  ) to 40% (p) increase from peripheral to central PHENIX:PRC 69, 034909 (2004)

9 9 Kinetic freeze-out particle spectra  kinetic freeze-out properties, total collective radial flow.  ,K,p: T kin decreases,  increases with centrality.  ,  (low hadronic x- sections): higher T kin ≈ T ch (for 200 GeV Au+Au), still significant radial flow. Blast wave fit T ch

10 10 Chemical freeze-out hadron-chemistry: particle ratios  chemical freeze-out properties short lived resonances T ch ss T ch ≈ T C ≈ 165 ± 10 MeV Chemical freeze-out ≈ hadronization. s ~ u, d Strangeness is chemically equilibrated at RHIC energies. STAR white paper Nucl. Phys A757 (05) 102

11 11 In p+p particle ratios are well described with T=160 MeV. Resonance ratios in Au+Au are not are well described with T ch = 160  10 MeV,  B = 24  5 MeV (O. Barannikova). Resonance Suppression STAR Preliminary p+p 200 GeVAu+Au 200 GeV c.f.) F. Becattini, Nucl. Phys. A 702, 336 (2002) But thermal model is not perfect…

12 12 Thermal model [1]: T = 177 MeV  B = 29 MeV [1] P. Braun-Munzinger et.al., PLB 518(2001) 41 D.Magestro, private communication [2] Marcus Bleicher and Jörg Aichelin Phys. Lett. B530 (2002) 81. M. Bleicher and Horst Stöcker.Phys.G30 (2004) 111. Rescattering and regeneration is needed ! UrQMD [2] Life time [fm/c] :  (1020) = 40  (1520) = 13 K(892) = 4  ++ = 1.7  p+p ratios are consistent with thermal model prediction T=160 MeV Resonance Production in p+p and Au+Au

13 13  1520) p K  p K Re-scattering Between chemical and kinetic freeze-out: (shot lived resonances) Rescattering > Regeneration -> Resonance signal loss Time chemical freeze-out end of inelastic interactions T~170 MeV particle abundance kinetic freeze-out end of elastic interactions T~110MeV particle spectra, HBT Detector Regeneration Resonance Yields: Re-scattering / Regeneration Scenario

14 14 Model includes: Temperature at chemical freeze-out Lifetime between chemical and thermal freeze- out No regeneration included. results between : T= 160 MeV =>  > 4 fm/c (lower limit !!!)  = 0 fm/c => T= 110-130 MeV  (1520)/  = 0.034  0.011  0.013 K*/K - = 0.20  0.03 at 0-10% most central Au+Au G. Torrieri and J. Rafelski, Phys. Lett. B509 (2001) 239 Life time: K(892) = 4 fm/c  (1520) = 13 fm/c Temperature, Lifetime and from  (1520) /  and K(892)/K

15 15 More Resonances from PHENIX From combinations of  ±, K ±, p,  p, and  n in PHENIX. Invariant mass [GeV/c 2 ] 00 K0sK0s p T =1-2 GeV/c Invariant mass [GeV/c 2 ] p T =1-2 GeV/c  Invariant mass [GeV/c 2 ] K *0 p T =1-2 GeV/c Invariant mass [GeV/c 2 ] Not enough statistics..    p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Invariant mass [GeV/c 2 ]  p T =1-2 GeV/c Demonstration from –Run3 s NN =200 GeV p+p –~24M events of Min Bias trigger From SQM04 M. Kaneta

16 16 Physics at intermediate p T

17 17 Baryon Anomaly at RHIC More (anti) baryons than pions at moderate p T (2-5 GeV/c). Does not look like vacuum jet fragmentation. Factorization assumption of jet fragmentation completely breaks down. Peripheral Central PHENIX: PRL 91, 172301 (2003), PRC 69, 034909 (2004) (anti-) Proton /  Ratio

18 18 No suppression for protons p, pbar : No suppression at intermediate p T (1.5 GeV - 4.5 GeV) Why. Is it due to strong radial flow or other mechanism? R CP ~ R AA Shaded boxes : N part, N coll determination errors. PHENIX: PRL 91, 172301 (2003), PRC 69, 034909 (2004) Recombination model Fries, et al, nucl-th/0301087 Greco, Ko, Levai, nucl-th/0301093

19 19 Other hadrons? baryon meson The mesons and baryons form two distinct groups, independent of particle mass. Diverge at p T ~ 2 GeV/c and come together at 5 GeV/c. Observed for first time at RHIC.

20 20 More on  →K + K - R AA (new Run4 data)  R AA (high statistics Run4 data) looks like the   rather than the proton, even if mass(  ) ~ mass(p)! Suggested that it’s not the mass effect (flow). Nuclear Modification Factor

21 21  meson “R cp “ from STAR Run-4 :Au+Au 200 GeV Note: it’s not R AA ! Confirmed that high statistics  data behaves like meson. Favor: recombination model at intermediate p T. R cp

22 22 System size dependence: Cu+Cu @ 200 GeV Baryon/meson ratio at 2 GeV in Cu+Cu scales as N part.  Rather is smooth transition from Cu+Cu to Au+Au. p/  ratio in Cu+Cu/Au+Au Central Au+Au Central Cu+Cu

23 23 d+Au experiment

24 24 The Baseline: p+p and d+Au p+p and d+Au data from RHIC Run-3 at √s NN =200 GeV PRELIMINARY nucl-ex/0601033 (STAR) Combination of TOF and TPC info. High p T p and  PID: Multi-Gaussian fit of dE/dx distribution (relativistic rise, TPC). Charged kaon contaminations can be estimated by K 0 s yields

25 25 R dAu and Cronin effect Phys. Lett. B 586, 244 (2004) No suppression at intermediate and high p T at midrapidity. Protons have a significant enhancement, traditionally called “the Cronin effect” (~40%). Initial Glauber-Eikonal multiple scattering model by Accardi and Gyulassy describes the data well. CGC: Kharzeev, Levin, McLerran Phys. Lett. B 561, 93 (2003) PRELIMINARY

26 26 R dA from STAR R dAu (pT = 2 - 5 GeV/c): –Proton ~1.5 (min. bias) –Pion ~1.25 (min. bias) nucl-ex/0601033 (STAR)  p

27 27 R AuAu vs. R dAu Pions suppressed by a factor of ~6 with respect to protons Proton Cronin effect larger by ~30% d+Au collisions can not account for the huge gap between protons and pions in central Au+Au collisions. PRELIMINARY

28 28 Need something else too… Recombination?! Recombination of shower partons in A+A and p+A: Thermal and shower components. HWA & YANG Phys.Rev.C70:037901,2004. “Thermal Thermal+Shower Fragmentation (one jet) Different jets. “

29 29 HBT measurements

30 HBT: Femtoscopic radii Scaling of R(d N ch /d  m T,  s NN ) for data and full hydro calculations. New tool: source imaging technique. Nice summary paper: “Femtoscopy in RHIC”, Soltz, Lisa, Pratt, Wiedemann, nucl-ex/0505014.

31 31 Femtoscopy = measurement that provides spatio-temporal information on fm scale (via interactions on MeV scale). “Femtoscopic” correlations Statistical Interference Coulomb Interaction Strong Interaction fermi sized source MeV correlation fit to Gaussian model

32 32 A simple (2-particle) source Can we resolve the  contaminations and/or see an exponential tail? Resonance cloud sub MeV correlation irresolvable reduces strength R long 2 ~   (lifetime) R side 2 ~ dx 2 (geometry) R out 2 ~ dx 2 + dt 2 - 2dxdt  decay resolvable?

33 Scaling #1 N part scaling shows clear dependence on initial state geometric overlap R long obeys dN/d  scaling R side shows slight preference R out appears to increase for lower energy systems

34 34 Scaling #2 - Transverse (pair) Mass Simple picture of space-time evolution, w/ no room for hadron re-scattering? R 2  =   ? R 2K + = R 2K - ?

35 35 The “HBT Puzzle” in Hydro 1.flow effect 2.hadronic re- scattering 1.viscosity 2.better EOS All solutions partial - break agreement w/ flow, spectra, other radii. Look again at systemmatics.

36 36 62-200 GeV Hydro vs. Data R long scaling fully reproduced R out slight increase for lower energy, agreement at mid- centrality R side hydro extrapolates back to dAu

37 37 Source imaging at AGS/RHIC 1D image yields excess over angle avg. 3D Gaussian fits  contribution or long duration tail? 3D imaging may answer nucl-th/0507015 (Brown) also nucl-th/0501003 Pratt & Danielewicz PRELIMINARY

38 38 Summary (1) Kinetic freeze-out – ,K,p: T kin decreases,  increases with centrality. –kinetic freeze-out ≈ chemical freeze-out (~ 160 MeV). Chemical freeze-out / Resonances –Provide a time scale between chemical and kinetic freeze-out. –Re-scattering and regeneration model:  > 4 fm (lower limit). Baryon/Meson effect –High statistics  R AA : meson like behavior, favorable recombination model. –Cu+Cu data: N part scaling worked. d+Au experiment –Particle type depended of R dAu : p < K < p, but not enough to account for baryon/meson effect in Au+Au. –Recombination in d+Au?

39 39 Summary (2) HBT measurements –detailed systematics in N part & dN  d  vs Hydro  R long (dN  d ,m T ) fully reproduced by hydro R out (dN  d ,m T ) decreasing with increasing  s NN R side (dN  d ,m T ) remains a challenge –Source imaging: evidence for a long tail in pion emission source. Run-6 (Mar.- Jun., 2006) will start soon! p+p (62.4 GeV, 200 GeV, 22.5 GeV?) will provide important reference data for lower energy Au+Au/Cu+Cu data set.

Download ppt "1 Tatsuya Chujo Univ. of Tsukuba Soft particle production at RHIC CNS-RIKEN workshop “Physics of QGP at RHIC” (Feb. 16, 2006)"

Similar presentations

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.
Quark Matter 2006 (2006.11.18) Excitation functions of baryon anomaly and freeze-out properties at RHIC-PHENIX Tatsuya Chujo (University of Tsukuba) for.

Quark Matter 2006 ( ) Excitation functions of baryon anomaly and freeze-out properties at RHIC-PHENIX Tatsuya Chujo (University of Tsukuba) for.
K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.

K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.
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.
ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights.

ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights.
DNP03, Tucson, Oct 29, 2003 1 Kai Schweda Lawrence Berkeley National Laboratory for the STAR collaboration Hadron Yields, Hadrochemistry, and Hadronization.

DNP03, Tucson, Oct 29, Kai Schweda Lawrence Berkeley National Laboratory for the STAR collaboration Hadron Yields, Hadrochemistry, and Hadronization.
STAR Patricia Fachini 1 Brookhaven National Laboratory Motivation Data Analysis Results Conclusions Resonance Production in Au+Au and p+p Collisions at.

STAR Patricia Fachini 1 Brookhaven National Laboratory Motivation Data Analysis Results Conclusions Resonance Production in Au+Au and p+p Collisions at.
1 Baryonic Resonance Why resonances and why  * ? How do we search for them ? What did we learn so far? What else can we do in the.

1 Baryonic Resonance Why resonances and why  * ? How do we search for them ? What did we learn so far? What else can we do in the.
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 Systematic studies of freeze-out source size in relativistic heavy-ion collisions by RHIC-PHENIX Akitomo Enokizono Lawrence Livermore National Laboratory.

1 Systematic studies of freeze-out source size in relativistic heavy-ion collisions by RHIC-PHENIX Akitomo Enokizono Lawrence Livermore National Laboratory.
Jana Bielcikova (Yale University) for the STAR Collaboration 23 rd Winter Workshop on Nuclear Dynamics February 12-18, 2007 Two-particle correlations with.

Jana Bielcikova (Yale University) for the STAR Collaboration 23 rd Winter Workshop on Nuclear Dynamics February 12-18, 2007 Two-particle correlations with.
Recent Results from STAR Rene Bellwied, Wayne State, for the STAR Collaboration  Thermalization & Timescales  High pt physics  Fluctuations  130 to.

Recent Results from STAR Rene Bellwied, Wayne State, for the STAR Collaboration  Thermalization & Timescales  High pt physics  Fluctuations  130 to.
5-12 April 2008 Winter Workshop on Nuclear Dynamics STAR Particle production at RHIC Aneta Iordanova for the STAR collaboration.

5-12 April 2008 Winter Workshop on Nuclear Dynamics STAR Particle production at RHIC Aneta Iordanova for the STAR collaboration.
Resonance Dynamics in Heavy Ion Collisions 22nd Winter Workshop on Nuclear Dynamics 17.03.2006, La Jolla, California Sascha Vogel, Marcus Bleicher UrQMD.

Resonance Dynamics in Heavy Ion Collisions 22nd Winter Workshop on Nuclear Dynamics , La Jolla, California Sascha Vogel, Marcus Bleicher UrQMD.
Collision system dependence of 3-D Gaussian source size measured by RHIC-PHENIX Akitomo Enokizono Lawrence Livermore National Laboratory 23 rd Winter Workshop.

Collision system dependence of 3-D Gaussian source size measured by RHIC-PHENIX Akitomo Enokizono Lawrence Livermore National Laboratory 23 rd Winter Workshop.
Helen Caines Yale University SQM – L.A.– March 2006 Using strange hadron yields as probes of dense matter. Outline Can we use thermal models to describe.

Helen Caines Yale University SQM – L.A.– March 2006 Using strange hadron yields as probes of dense matter. Outline Can we use thermal models to describe.
Identified and Inclusive Charged Hadron Spectra from PHENIX Carla M Vale Iowa State University for the PHENIX Collaboration WWND, March 14 2006.

Identified and Inclusive Charged Hadron Spectra from PHENIX Carla M Vale Iowa State University for the PHENIX Collaboration WWND, March
12-17 February 2007 Winter Workshop on Nuclear Dynamics STAR identified particle measurements at large transverse momenta in Cu+Cu collisions at RHIC Richard.

12-17 February 2007 Winter Workshop on Nuclear Dynamics STAR identified particle measurements at large transverse momenta in Cu+Cu collisions at RHIC Richard.
Hadronic Resonances in Heavy-Ion Collisions at ALICE A.G. Knospe for the ALICE Collaboration The University of Texas at Austin 25 July 2013.

Hadronic Resonances in Heavy-Ion Collisions at ALICE A.G. Knospe for the ALICE Collaboration The University of Texas at Austin 25 July 2013.
Marcus Bleicher, CCAST- Workshop 2004 Strangeness Dynamics and Transverse Pressure in HIC Marcus Bleicher Institut für Theoretische Physik Goethe Universität.

Marcus Bleicher, CCAST- Workshop 2004 Strangeness Dynamics and Transverse Pressure in HIC Marcus Bleicher Institut für Theoretische Physik Goethe Universität.

Similar presentations

Ads by Google