Recent Open Heavy Flavor Results from PHENIX

J. Matthew Durhamfor the PHENIX CollaborationStony Brook University

durham@skipper.physics.sunysb.edu

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Heavy Quarks (charm and bottom) Produced by gluon fusion in early stages of collisions

Experience full medium evolution

Expected to lose less energy in medium “Dead cone effect” suppresses gluon radiation at

small angles θ <mQ/EQY. Dokshitzer, D. Kharzeev, PLB 519, 199 (2001), hep-ph/0106202

parton

hot and dense mediumExpectation from dead cone:

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Open Heavy Flavor at RHICMost measurements rely on semileptonic decays of D, B mesons

p+p

PRL97, 252002 (2006)

PRD 83 (2011) 52006

d+Au Cu+Cu Au+Au

PRL 98, 172301 (2007)

PRL 98 (2007) 192301 Preliminary Preliminary

Preliminary

Ncoll = 1 Ncoll ~ 1000

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Charm/bottom Separation

PRL 103, 082002 (2009) PRL 105, 202301 (2010)

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The PHENIX Experiment Electrons are tracked by drift

chamber and pad chamber

The Ring Imaging Cherenkov Counter is primary electron ID device

Electromagnetic calorimeters measure electron energy – allow E/p comparisons

Background electron contribution determined through two methods

Converter Increase photonic background

by well defined amount Cocktail

Calculate background through Monte Carlo decay generator

e+e

Run-8 Configuration

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At pT> 5 GeV/c:At pT< 5 GeV/c:

Mostly bottomMostly charm

Phys. Rev. Lett. 98, 172301 (2007)

PRL 105, 202301 (2010)

PRL 103, 082002 (2009)

Opposite of expectation

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Improved p+p Baseline

Combined Run5 and Run6 p+p statistics

Smaller uncertainties Allows more precise

RAA comparisons

Increased pT range

Consistent with previous results in overlap region

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Run -8 d+Au – CNM Baseline

Combination of background subtraction methods

Cocktail subtraction Photonic components

scaled to match converter method

Difference in cocktail and converter photonic background ~5-10% for each centrality

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Peripheral RdA

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Semi-Peripheral RdA

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Semi-Central RdA

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Central RdA

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Peripheral RdA consistent with p+p

Evidence of CNM effects on open HF yields at 1<pT<4 GeV/c for more central collisions

With large systematic uncertainties from cocktail

Cu+Cu examines Ncoll region between d+A and central Au+Au (up to ~200)

A few comments on RdA

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Cu+Cu and Au+Au

<Ncoll> CuCu = 150

<Ncoll> AuAu = 91

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Trend with <Ncoll>

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Trend with <Ncoll>

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Light Quarks Heavy Quarks

Phys. Rev. Lett. 101, 232301 (2008) arXiv:1005.1627

Phys. Rev. Lett. 98, 172302 (2007)

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At pT> 5 GeV/c:At pT< 5 GeV/c:

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Summary

Preliminary PHENIX results fill in Ncoll region between p+p and Au+Au

Good match between central d+Au, peripheral Cu+Cu Good match between central Cu+Cu, peripheral Au+Au

Evidence for CNM effects at moderate pT

Possibly resolves difference between pion and HF RAA

Need guidance from theory for quantitative comparison

Definitive measurements with VTX forthcoming

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13 Countries; 70 Institutions

Abilene Christian University, Abilene, TX 79699, U.S.Baruch College, CUNY, New York City, NY 10010-5518, U.S.Collider-Accelerator Department, Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.Physics Department, Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.University of California - Riverside, Riverside, CA 92521, U.S.University of Colorado, Boulder, CO 80309, U.S.Columbia University, New York, NY 10027 and Nevis Laboratories, Irvington, NY 10533, U.S.Florida Institute of Technology, Melbourne, FL 32901, U.S.Florida State University, Tallahassee, FL 32306, U.S.Georgia State University, Atlanta, GA 30303, U.S.University of Illinois at Urbana-Champaign, Urbana, IL 61801, U.S.Iowa State University, Ames, IA 50011, U.S.Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.University of Maryland, College Park, MD 20742, U.S.Department of Physics, University of Massachusetts, Amherst, MA 01003-9337, U.S. Morgan State University, Baltimore, MD 21251, U.S.Muhlenberg College, Allentown, PA 18104-5586, U.S.University of New Mexico, Albuquerque, NM 87131, U.S. New Mexico State University, Las Cruces, NM 88003, U.S.Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.Department of Physics and Astronomy, Ohio University, Athens, OH 45701, U.S.RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.Chemistry Department, Stony Brook University,SUNY, Stony Brook, NY 11794-3400, U.S.Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, NY 11794, U.S.University of Tennessee, Knoxville, TN 37996, U.S.Vanderbilt University, Nashville, TN 37235, U.S.

Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, BrazilInstitute of Physics, Academia Sinica, Taipei 11529, TaiwanChina Institute of Atomic Energy (CIAE), Beijing, People's Republic of ChinaPeking University, Beijing, People's Republic of ChinaCharles University, Ovocnytrh 5, Praha 1, 116 36, Prague, Czech RepublicCzech Technical University, Zikova 4, 166 36 Prague 6, Czech RepublicInstitute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech RepublicHelsinki Institute of Physics and University of Jyväskylä, P.O.Box 35, FI-40014 Jyväskylä, FinlandDapnia, CEA Saclay, F-91191, Gif-sur-Yvette, FranceLaboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, FranceLaboratoire de Physique Corpusculaire (LPC), Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, FranceIPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, FranceDebrecen University, H-4010 Debrecen, Egyetem tér 1, HungaryELTE, Eötvös Loránd University, H - 1117 Budapest, Pázmány P. s. 1/A, HungaryKFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, POBox 49, Budapest, HungaryDepartment of Physics, Banaras Hindu University, Varanasi 221005, IndiaBhabha Atomic Research Centre, Bombay 400 085, IndiaWeizmann Institute, Rehovot 76100, IsraelCenter for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanHiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, JapanKEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, JapanKyoto University, Kyoto 606-8502, JapanNagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, JapanRIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, JapanPhysics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, JapanDepartment of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, JapanInstitute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, JapanChonbuk National University, Jeonju, KoreaEwha Womans University, Seoul 120-750, KoreaHanyang University, Seoul 133-792, KoreaKAERI, Cyclotron Application Laboratory, Seoul, South KoreaKorea University, Seoul, 136-701, KoreaMyongji University, Yongin, Kyonggido 449-728, KoreaDepartment of Physocs and Astronomy, Seoul National University, Seoul, South KoreaYonsei University, IPAP, Seoul 120-749, KoreaIHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, RussiaINR_RAS, Institute for Nuclear Research of the Russian Academy of Sciences, prospekt 60-letiya Oktyabrya 7a, Moscow 117312, RussiaJoint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RussiaRussian Research Center "Kurchatov Institute", Moscow, RussiaPNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, RussiaSaint Petersburg State Polytechnic University, St. Petersburg, RussiaSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow 119992, Russia Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden

Feb 2011

THANK YOU

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BACKUPS

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d+Au and Cu+Cu

<Ncoll> dAu = 15

<Ncoll> CuCu = 22.3

Preliminary

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Cocktail Subtraction

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A. Dion, QM09

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Photonic Backgrounds

Excellent agreement between the two methods

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