Search for disoriented chiral condensates in 158 AGeV Pb+Pb collisions

University of Panjab, Chandigarh 160014, India; University of Rajasthan, Jaipur 302004, Rajasthan, India; Variable Energy Cyclotron Centre, Calcutta 700 064, India; University of Geneva, CH-1211 Geneva 4, Switzerland; RRC (Kurchatov), RU-123182 Moscow, Russia; Joint Institute for Nuclear Research, RU-141980 Dubna, Russia; Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, USA; University of Jammu, Jammu 180001, India; University of Münster, D-48149 Münster, Germany; SUBATECH, Ecole des Mines, Nantes, France; Gesellschaft für Schwerionenforschung (GSI), D-64220 Darmstadt, Germany; Universiteit Utrecht/NIKHEF, NL-3508 TA Utrecht, The Netherlands; University of Lund, SE-221 00 Lund, Sweden; University of Tsukuba, Ibaraki 305, Japan; Nuclear Physics Institute, CZ-250 68 Rez, Czech Republic; KVI, University of Groningen, NL-9747 AA Groningen, The Netherlands; Institute for Nuclear Studies, 00-681 Warsaw, Poland; MIT Cambridge, MA 02139, USA; Institute of Physics, 751-005 Bhubaneswar, India; University of Tennessee, Knoxville, TN 37966, USA
Physics Letters B (Impact Factor: 4.57). 02/1998; 420(1-2):169-179. DOI: 10.1016/S0370-2693(97)01528-1

ABSTRACT The restoration of chiral symmetry and its subsequent breaking through a phase transition has been predicted to create regions of Disoriented Chiral Condensates (DCC). This phenomenon has been predicted to cause anomalous fluctuations in the relative production of charged and neutral pions in high-energy hadronic and nuclear collisions. The WA98 experiment has been used to measure charged and photon multiplicities in the central region of 158 AGeV Pb+Pb collisions at the CERN SPS. In a sample of 212646 events, no clear DCC signal can be distinguished. Using a simple DCC model, we have set a 90% C.L. upper limit on the maximum DCC production allowed by the data.


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Jun 1, 2014