ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 1 Kaon Freeze-out Dynamics in √s NN =200 GeV Au+Au Collisions at RHIC * Nuclear Physics Institute Czech Academy of Sciences Michal Šumbera sumbera@ ujf.cas.cz . for the collaboration XLIII International Symposium on Multiparticle Dynamics September 15-20, 2013 Illinois Institute of Technology, Chicag iv:1302.3168 [nucl-ex] accepted in Phys. Rev. C
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ISMD13, 09/19/2013M. Šumbera, STAR: Kaon Femtoscopy 1 Kaon Freeze-out Dynamics in √s NN =200 GeV Au+Au Collisions at RHIC * Kaon Freeze-out Dynamics in.
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ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 1
Kaon Freeze-out Dynamics in √sNN=200 GeV Au+Au Collisions
ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 3
Correlation femtoscopy in a nutshell (2/3) The correlation is determined by the size of region from which particles with roughly the same velocity are emitted
Femtoscopy measures size, shape, and orientation of homogeneity regions
ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 4
Correlation femtoscopy in a nutshell (3/3)
Emitting source
Kernel K(q,r) is independent of freeze-out conditions S(r) is often assumed to be Gaussian HBT radiiOther option: Inversion of linear integral equation to obtain source functionÞ Model-independent analysis of emission shape
(goes beyond Gaussian shape assumption)
Source function(Distribution of pair separations in the
ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 10
PID cut applied1. Source shape analysis
dE/dx: nσ(Kaon)<2.0 and nσ(Pion)>3.0 and nσ(electron)>2.0nσ(X) :deviation of the candidate dE/dx from the normalized distribution of particle type X at a given momentum
ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 11
STAR data well described by a single Gaussian. Contrary to PHENIX no non-gaussian tails observed. May be due to a different kT-range: STAR bin is 4x narrower.
1D analysis result
STAR PRELIMINARY
STAR PRELIMINARY
34M+83M=117M (K+K+ & K-K-) pairs PHENIX, PRL 103:,142301, 2009
ISMD13, 09/19/2013 M. Šumbera, STAR: Kaon Femtoscopy 21
Thank You!NIKHEF and Utrecht University, Amsterdam, The NetherlandsOhio State University, Columbus, Ohio 43210Old Dominion University, Norfolk, VA, 23529Panjab University, Chandigarh 160014, IndiaPennsylvania State University, University Park, Pennsylvania 16802Institute of High Energy Physics, Protvino, RussiaPurdue University, West Lafayette, Indiana 47907Pusan National University, Pusan, Republic of KoreaUniversity of Rajasthan, Jaipur 302004, IndiaRice University, Houston, Texas 77251Universidade de Sao Paulo, Sao Paulo, BrazilUniversity of Science \& Technology of China, Hefei 230026, ChinaShandong University, Jinan, Shandong 250100, ChinaShanghai Institute of Applied Physics, Shanghai 201800, ChinaSUBATECH, Nantes, FranceTexas A\&M University, College Station, Texas 77843University of Texas, Austin, Texas 78712University of Houston, Houston, TX, 77204Tsinghua University, Beijing 100084, ChinaUnited States Naval Academy, Annapolis, MD 21402Valparaiso University, Valparaiso, Indiana 46383Variable Energy Cyclotron Centre, Kolkata 700064, IndiaWarsaw University of Technology, Warsaw, PolandUniversity of Washington, Seattle, Washington 98195Wayne State University, Detroit, Michigan 48201Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaYale University, New Haven, Connecticut 06520University of Zagreb, Zagreb, HR-10002, Croatia
Argonne National Laboratory, Argonne, Illinois 60439Brookhaven National Laboratory, Upton, New York 11973University of California, Berkeley, California 94720University of California, Davis, California 95616University of California, Los Angeles, California 90095Universidade Estadual de Campinas, Sao Paulo, BrazilUniversity of Illinois at Chicago, Chicago, Illinois 60607Creighton University, Omaha, Nebraska 68178Czech Technical University in Prague, FNSPE, Prague, 115 19, Czech RepublicNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicUniversity of Frankfurt, Frankfurt, GermanyInstitute of Physics, Bhubaneswar 751005, IndiaIndian Institute of Technology, Mumbai, IndiaIndiana University, Bloomington, Indiana 47408Alikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaUniversity of Jammu, Jammu 180001, IndiaJoint Institute for Nuclear Research, Dubna, 141 980, RussiaKent State University, Kent, Ohio 44242University of Kentucky, Lexington, Kentucky, 40506-0055Institute of Modern Physics, Lanzhou, ChinaLawrence Berkeley National Laboratory, Berkeley, California 94720Massachusetts Institute of Technology, Cambridge, MA Max-Planck-Institut f\"ur Physik, Munich, GermanyMichigan State University, East Lansing, Michigan 48824Moscow Engineering Physics Institute, Moscow Russia