Mike Leitch - LANL 1 Charmonium Production in p-A Collisions Mike Leitch - Los Alamos National Laboratory International Workshop on the.

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Presentation transcript:

Mike Leitch - LANL 1 Charmonium Production in p-A Collisions Mike Leitch - Los Alamos National Laboratory International Workshop on the Physics of the Quark-Gluon Plasma Ecole Polytechnique, Palaiseau, France September 4-7, 2001  Introduction to Physics of Charmonium suppression in nuclei  E866/NuSea results for J/  and  ’  NA50 comparison & future at NA60 & HERA-B  Prospects at PHENIX  Summary E

Mike Leitch - LANL 2 Modification of parton momentum distributions of nucleons embedded in nuclei e.g. shadowing – depletion of low-momentum partons. Process dependent? Nuclear effects on parton “dynamics” energy loss of partons as they propagate through nuclei and (associated) multiple scattering effects Production of heavy vector mesons, e.g. J/Ψ, Ψ ',  production: color singlet or octet ( ) and color neutralization timescale hadronization time: Coherence length for cc fluctuations: absorption on nucleons or co-movers feed-down from higher mass resonances, e.g. χ c Nuclear modification of parton level structure & dynamics Drell-Yan E866 R(W/Be) E772 R(W/D) Ratio(W/Be) NMC DIS Drell-Yan Process

Mike Leitch - LANL 3 J/Ψ suppression – an effective signature of Quark-gluon plasma (QGP) formation? Color screening in a QGP would destroy pairs before they can hadronize into charmonium But ordinary nuclear effects also absorb or modify J/Ψ’s We need a comprehensive understanding of charmonium production in nuclei Competing effects may be identified in p-A collisions by their strong kinematic dependencies, together with complementary studies of Drell-Yan scattering and open-charm production DY  J/ 

Mike Leitch - LANL 4 FNAL E866/NuSea Collaboration Abilene Christian University Donald Isenhower, Mike Sadler, Rusty Towell, Josh Willis Argonne National Laboratory Don Geesaman, Sheldon Kaufman, Bryon Mueller Fermi National Accelerator Laboratory Chuck Brown, Bill Cooper Georgia State University Gus Petitt, Xiao-chun He, Bill Lee Illinois Institute of Technology Dan Kaplan Los Alamos National Laboratory Tom Carey, Gerry Garvey, Mike Leitch, Pat McGaughey, Joel Moss, Jen-Chieh Peng, Paul Reimer, Walt Sondheim New Mexico State University Mike Beddo, Ting Chang, Vassili Papavassiliou, Jason Webb Oak Ridge National Laboratory Paul Stankus, Glenn Young Texas A & M University Carl Gagliardi, Bob Tribble, Eric Hawker, Maxim Vasiliev Valparaiso University Don Koetke

Mike Leitch - LANL 5 Forward x F, high-mass spectrometer Solid Be, Fe, W and empty targets Thick absorber wall to filter out all but μ’s Two acceptance defining magnets Four tracking stations and one momentum analyzing magnet Scale 60m long, 3m x 3m at back FNAL E866/NuSea

Mike Leitch - LANL 6 DY Open Charm Randoms

Mike Leitch - LANL 7 Effect of experimental p T -acceptance on the measured J/Ψ suppression Three E866/NuSea data sets At lowest x F, p T -acceptance is considerably narrowed Shown in terms of α, where σ A = σ N * A  ( α = 1 corresponds to NO suppression)

Mike Leitch - LANL 8 Correction to Nuclear Dependence for p T Acceptance Incomplete coverage in p T can distort J/Ψ suppression versus x F E866/NuSea p T coverage is much better than previous experiment (e.g. E772) because of improved trigger Most significant effects are at lowest x F where p T is cut off near 1 GeV/c Use MC acceptance & dσ/dp T consistent with our data to correct for incomplete coverage

Mike Leitch - LANL 9 Three magnet settings in E866 match up well Systematic errors shown at bottom of top panel J/Ψ and Ψ’ similar at large x F where they both correspond to a cc traversing the nucleus but Ψ’ absorbed more strongly than J/Ψ near mid-rapidity (x F ~ 0) where the resonances are beginning to be hadronized in nucleus. E866/NuSea 800 GeV p-A (Fermilab) PRL 84, 3256 (2000)

Mike Leitch - LANL 10

Mike Leitch - LANL 11 Scaling of J/  Suppression? Comparison of 800 GeV (E866) and 200 GeV (NA3) Appears to scale only with x F

Mike Leitch - LANL 12 Arleo,Gossiaux,Gousset,Aichelin Model (PRC 61, (2000) & hep-ph/ ) Absorption of color-octet or –singlet with color neutralizaton times J/ ,  ’ &  c with feed-down Fit to E866/NuSea data with no shadowing & no dE/dx. E866 data J/  ’’ xFxF R(Au/p) y CM ’’ J/  200 GeV p+Au (RHIC) +dE/dx w/o dE/dx p-Au at RHIC: Predictions J/  &  ’ differences at negative rapidity Effect of dE/dx, also at negative rapidity PHENIX Muon Arms pre-resonance fully-formed resonances

Mike Leitch - LANL 13 Parton Energy Loss in Nuclei – Kopeliovich Model Johnson, Kopeliovich et al., hep-ph/ Shadowing dE/dx & Shadowing Drell-Yan data from E772 (PRL 64, 2479 (1990)) Shadowing when coherence length, is larger than nucleon separation Three dE/dx mechanisms: String breaking: dE/dz ~ K s ~ 1 GeV/fm Multiple bremstrahlung: dE/dz ~ 3  /  ~.8 GeV/fm Radiative gluon (BDMS):  E ~ 3  /8  ~.075 GeV/fm (since ~ 0.1 GeV 2 from E772) Total  E ~ 2 GeV/fm expected from above From E866 DY data with separation of shadowing & dE/dx via Mass dependence, gives dE/dz ~ 3 ±.6 GeV/fm

Mike Leitch - LANL 14 Kopeliovich, Tarasov, Hufner hep-ph/ E866 data Full calculation Model: absorption Dynamic calculation of shadowing and of energy loss Also gluon anti-shadowing from Eskola

Mike Leitch - LANL 15 Feeding of J/Ψ’ s from Decay of Higher Mass Resonances 300 GeV/c, PRL 70, 383 (1993) Large fraction of J/Ψ’ s are not produced directly Nuclear dependence of parent resonance, e.g. χ C is probably different than that of the J/Ψ e.g. in proton production ~30% of J/Ψ’ s will have effectively stronger absorption because they were actually more strongly absorbed (larger size) χ C ’s while in the nucleus ProtonPion χ,1,2  J/Ψ 30%37% Ψ΄  J/Ψ 5.5%7.6% MesonM(GeV)R(Fm) BE (MeV) J/Ψ3.1.45~640 Ψ΄3.7.88~52 χCχC

Mike Leitch - LANL 16 Open Charm Nuclear Dependence : x F Dependence? E GeV  ± PRL 70,722 (1993) WA GeV  - PRB 284,453 (1992) Vogt et al., NP 383,643 (1992) E GeV  - WA GeV  - (Beam dump)

Mike Leitch - LANL 17 Muon spectrometer: air-gap toroidal magnet with B ~ 2.1 Tm Covers 3 = 1.3 GeV/c 2, |cost CS | < 0.5 (-0.1 < x F < 0.1) Good p T coverage with constant acceptance up to 4 GeV/c Typically ~2e8 protons/(2.36s spill) Targets for 450 GeV/c runs: Be, Al, Cu, Ag, W NA50 (450 GeV/c); NA38 (200 GeV/c) NA50 Spectrometer

Mike Leitch - LANL 18 Comparison to NA50 J/Ψ Nuclear Dependence Expt.E(GeV)Y CM  J/Ψ  J/Ψ  -  Ψ E to ± ±.006* NA to ± ±.014 NA to ± y CM : * mid-rapidity part of E866 data  y~0 dependence? gluon shadowing? change in production, e.g. octet vrs singlet balance? (Both experiments have good p T coverage, so strong p T - dependence of α not the cause) Charmonia cross sections from NA50/51 for p-A collisions at 450 GeV/c NA50/ GeV E GeV p-p & p-d ’’ J/ 

Mike Leitch - LANL 19 Ψ’ to J/Ψ ratio (in  +  - channel) E789 – 800 GeV p-Au PRD52, 1307 (1995) NA50 – 200 & 450 GeV p-A PLB 444, 516 (1998) Independent of and rapidity?

Mike Leitch - LANL 20 J/Ψ Polarization E866/NuSea CDF NRQCD based predictions [Braaten & Fleming, PRL 74, 3327 (1995)] necessary to explain CDF charm cross sections E866 measurement not in agreement with NRQCD based predictions [ Beneke & Rothstein, PRD 54, 2005 (1996) ] which give 0.31 < λ < 0.63 or with color-singlet models [PRD 51, 3332 (1995)] Complicated by feedown (~40%) from higher mass states. No clear information on production mechanism!

Mike Leitch - LANL 21 New Measurements of J/Ψ, Ψ ' and χ C planned at HERA-B 2002 run will measure charmonium nuclear dependence with 920 GeV protons on C, Ti, W targets covering –0.3 < x F < 0.2, a region interestng in terms of formation time effects. Also would be first measurement (along with NA60) of χ C Expect ~1.5M J/ , 26k  ’ & 100k χ C Also will measure via B -> J/  + X Dimuon Mass (GeV) Counts J/  ’s &  ’’s from HERA-B 2000 test run (Comparison to E866 data)

Mike Leitch - LANL 22 NA60 – (slide from Carlos Lourenço)

Mike Leitch - LANL 23 NA60 – (slide from Carlos Lourenço)

Mike Leitch - LANL 24 NA60 NA60 – (slide from Carlos Lourenço)

Mike Leitch - LANL 25 Charmonium at PHENIX - Coming soon! e+e-e+e- +-+- PHENIX: South Muon & Electrons taking first data now North Muon in 2003 (after shutdown) Au-Au collisions now; but d-A collisions hopefully coming soon. * Min-bias/RHIC-year for  =.92 (Nagle & Brooks) ** E866 nuclear dependence data only *** Upsilons form E772

Mike Leitch - LANL 26 Gluon Shadowing for J/Ψ’s Kopeliovich, Tarasov, & Hufner hep-ph/ Eskola, Kolhinen, Vogt hep-ph/ J.C.Peng, LANL E866/NuSea PHENIX μ + μ - e+e-e+e- PHENIX μ + μ - (Au) In PHENIX μ acceptance for Au-Au collisions? Eskola… : ~ 0.8 Kopeliovich… : ~ 0.4 Strikman… [hep-ph/ ] : ~ 0.4 PHENIX μ PHENIX e E866 (mid-rapidity) NA50

Mike Leitch - LANL 27 Gluon shadowing Gerland, Frankfurt, Strikman, Stocker & Greiner (hep-ph/ ) Q = 2 GeV 5 GeV 10 GeV “Model”Rα No shadowing difference from fixed-target expt Eskola… w/o anti-shadowing Kopeliovich….4.74 Change due to shadowing for PHENIX μ relative to NA50 for different models to the W/H ratio (R) and the resulting effective α. ( Ratios due to gluon shadowing alone )

Mike Leitch - LANL 28 Summary: Charmonium suppression involves a non- trivial interplay between different effects and involves several timescales including that for hadronizaton and for the coherence of a pair. It has large variations with x F and p T that help reveal the underlying mechanisms p-A (or d-A) measurements serve as a basis for understanding what is seen in nucleus-nucleus collisions and are a must at RHIC. Shadowing is certainly very important at RHIC and must be measured in d-A collisions as soon as possible Eskola, Kolhinen, Vogt hep-ph/ PRL 84, 3256 (2000)

Mike Leitch - LANL 29 Measurements of  c are also important both intrinsically and because they contribute through feed-down to the J/  as also are measurements of open charm which can reveal gluon structure function modifications and initial-state effects E789 D 0 Measurement PRL 72, 2542 (1994) NA60 (from Carlos Lourenço) Summary - continued: