Upsilon Production in Heavy Ions with STAR and CMS

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Presentation transcript:

Upsilon Production in Heavy Ions with STAR and CMS HIT Seminar Berkeley Lab September 18, 2012. Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez Outline Bottomonium in heavy ion collisions Upsilon measurements in: STAR CMS Upsilon cross sections in p+p Upsilon nuclear modification factors Conclusions 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez Quarkonium in the QGP Heavy quarkonia: Heavy quark bound state are probes of the hot QCD medium Debye screening Matsui & Satz, PLB 178 416 (1986) Sequential Suppression Digal et al., PRD 64 2001 094015 Landau damping: Im V. (e.g. Laine et al., JHEP 03 2007 054) TC<T 0<T<TC T=0 ϒ 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

High T: the interaction between the heavy quarks is modified. Charmonium suppression: longstanding QGP signature Original idea: High T leads to screening Screening prevents heavy quark bound states from forming. J/ysuppression: Matsui and Satz, Phys. Lett. B 178 (1986) 416 lattice calculations, indications of screening Nucl.Phys.Proc.Suppl.129:560-562,2004 Note: Calculations of internal energy or internal energy O. Kaczmarek, et al., Nucl.Phys.Proc.Suppl.129:560-562,2004 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

The heavy quark potential in QCD Recent news: Heavy quark potential from (quenched) Lattice QCD A.Rothkopf, et al. PRL 108 (2012) 162001 Broadening due to collisions with medium (Im V) possibly more important than screening (Re V). 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Measuring the Temperature Quarkonia’s suppression pattern  QGP thermometer Lattice QCD Calculations: Dissociation temperatures of quarkonia states hep-ph/0110406 For  production at RHIC and LHC A cleaner probe compared to J/y co-mover absorption → negligible recombination → negligible d-Au: Cold Nuclear Matter Effects Shadowing / Anti-shadowing at y~0 Challenge: low rate, rare probe Large acceptance detector Efficient trigger Why do we measure Y at STAR A .Mocsy, 417th WE-Heraeus-Seminar,2008 Expectation: (1S) no melting (2S) likely to melt (3S) melts 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

J/y Puzzles from SPS and RHIC Similar J/y suppression at the SPS and RHIC! despite 10× higher √sNN Suppression does not increase with local energy density RAA(forward)<RAA(mid) Possible ingredients cold nuclear matter effects sequential melting regeneration What happens for bottomonium? 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Charmonium vs Bottomonium J/y suppression Hot nuclear matter effects: Suppression? Regeneration? Co-mover absorption? Energy loss? Flow? Bottomonium Expectations Cleaner probe of screening, deconfinement. Regeneration? Not a big role for bottomonium Open bottom: sbb ~ 1.34 – 1.84 mb. Open charm: scc ~ 551 – 1400 mb. Co-mover absorption? Expected to be small for bottomonium Charmonium sabs ~ 3 – 4 mb. Bottmonium sabs ~ 1 mb. Lin & Ko, PLB 503 104 (2001) 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez Upsilons in STAR Upsilons via Triggering, Calorimetry, Tracking, and matching of tracks to calorimeter towers. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez The CMS Detector ϒ event in CMS. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  in p+p 200 GeV in STAR 2006 2009 Phys. Rev. D 82 (2010) 12004 ∫L dt = 7.9 ± 0.6 pb-1 N(total)= 67±22(stat.) ∫L dt = 19.7 pb-1 N(total)= 145±26(stat.) STAR Preliminary 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

 Comparison to NLO pQCD CEM: R. Vogt, Phys. Rep. 462125, 2008 CSM: J.P. Lansberg and S. Brodsky, PRD 81, 051502, 2010 Comparison to NLO STAR √s=200 GeV p+p ++→e+e- cross section consistent with pQCD Color Evaporation Model (CEM) 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  in p+p 7 TeV in CMS Excellent resolution at midrapidity. Separation of 3 states. PRD 83, 112004 (2011) 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  vs √s, World Data STAR Preliminary STAR √s=200 GeV and CMS √s=7 TeV p+p ++→e+e- cross section consistent with pQCD and world data trend 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  in d+Au 200 GeV STAR Preliminary Signal has ~8σ significance pT reaches ~ 5 GeV/c ∫L dt = 32.6 nb-1 N+DY+bb(total)= 172 ± 20(stat.) Final results on RdAu coming soon. LHC pPb run in January/February. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  in Au+Au 200 GeV Raw yield of e+e- with |y|<0.5 = 197 ± 36 ∫L dt ≈ 1400 µb-1 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

 in Au+Au 200 GeV, Centrality STAR Preliminary STAR Preliminary STAR Preliminary Peripheral Central 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Bottomonia at 2.76 TeV: 2010 data pp PbPb PRL 107 (2011) 052302 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Bottomonia: 2011 data pp PbPb Ratios not corrected for acceptance and efficiency 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez  in Au+Au 200 GeV, RAA Models from M. Strickland and D. Bazow, arXiv:1112.2761v4 Indications of Suppression of Upsilon(1S+2S+3S) getting stronger with centrality. Reduced pp statistical uncertainties, increased statistics from 2009 data vs 2006 data. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ(2S)/ϒ(1S) Double Ratio, CMS Separated ϒ(2S) and ϒ(3S) Measured ϒ(2S) double ratio vs. centrality no strong centrality dependence 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ(1S) Nuclear Modification Factor: RAA CMS PbPb at 2.76 TeV In 2010: 7.28 µb−1 ϒ(1S) RAA, 3 centrality bins JHEP 1205 (2012) 063 In 2011: 150 µb−1 ϒ(1S) RAA, 7 centrality bins First results on ϒ(2S) RAA Clear suppression of ϒ(2S) ϒ(1S) suppression Consistent with excited state suppression only ~50% feed down CMS Preliminary, arXiv:1208.2826 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Comparison: RHIC and LHC STAR measured RAA of ϒ(1S+2S+3S) combined arXiv:1109.3891 min. bias value: CMS: separate RAA for ϒ(1S) and ϒ(2S) can calculate min. bias RAA of ϒ(1S+2S+3S): CMS Preliminary, arXiv:1208.2826 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ RAA Comparison to models I Incorporating lattice-based potentials, including real and imaginary parts A: Free energy Disfavored, not shown. B: Internal energy Consistent with data vs. Npart Includes sequential melting and feed-down contributions ~50% feed-down from cb. Dynamical expansion, variations in initial conditions (T0, η/S) Data indicate: 428 < T0 < 442 MeV at RHIC 552 < T0 < 580 MeV at LHC for 3 > 4pη/S > 1 M. Strickland, PRL 107, 132301 (2011). 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ RAA Comparison to models II Strong Binding Weak Binding Weak vs. Strong Binding Narrower spectral functions for “Strong” case Ratios of correlators compared to Lattice: favor “Strong” binding case Kinetic Theory Model Rate Equation: dissociation + regeneration Fireball model: T evolution. T ~ 300 MeV 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ RAA Comparison to models II Eur. Phys. J. A (2012) 48: 72 Comparison to data for “Strong” binding: Mostly consistent with data Little regeneration: Final result ~ Primordial suppression Large uncertainty in nuclear absorption. Need dAu, pPb. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

ϒ RAA pT and y dependence Indications that suppression is largest at low pT. and mid rapidity. Need more statistics for firmer conclusions. 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez

Manuel Calderón de la Barca Sánchez The bottom line... STAR and CMS: ϒ suppression vs. Npart. RAA consistent with suppression of feed down from excited states only (~50%) CMS: First measurement of ϒ(2S) suppression RAA(ϒ(3S)) < 0.09 (95% C.L.) ϒ(1S) RAA consistent with suppression of feed down from excited states only (~50%) Need more pp statistics to pin down lower-pT double ratio Pinning down the medium properties. Cold nuclear matter: coming soon! 9/18/12 HIT Seminar, Berkeley Lab Manuel Calderón de la Barca Sánchez