Biennial Report 2005-2007 - Saha Institute of Nuclear Physics

90 Biennial Report 2005-073.1.1.6 Major milestones which have been achieved during 2005 & 2006 in MAPMILESTONE COMPLETION TIMECompletion of MANAS Production October, 2006Completion of MANAS Delivery January, 2007Detector production at SINP June, 2006Detector Shipment to CERN October, 2006HitReconstruction Algorithm October, 2005Implementation on the HLT Cluster December, 20063.1.2 Quark-Gluon Plasma Phenomenology3.1.2.1 Kion to pion ratio in heavy ion collisionsThe momentum integrated Boltzmann equation has been used to study the evolution of strangenessof the strongly interacting system formed after the heavy ion collisions at relativistic energies. Weargue that the experimentally observed non-monotonic, horn-like structure in the variation of theK + /π + with colliding energy appears due to the release of large number of colour degrees offreedom.JK Nayak†, J Alam†, P Roy, AK Dutt-Mazumder, B Mohanty†HEP3.1.2.2 Energy loss and dynamical evolution of quark p T spectraAverage energy loss of light quarks has been calculated in a two stage equilibrium scenario wherethe quarks are executing Brownian motion in a gluonic heat bath. The evolution of the quark p Tspectra is studied by solving Fokker-Planck equation in an expanding plasma.P Roy, J Alam†, AK Dutt-Mazumder†HEP3.1.2.3 Phi production at RHIC: characterization of co-existence phaseWe extract the effective degrees of freedom that characterize the co-existing phase of quark gluonplasma and hadrons. Experimental data on phi at mid-rapidity is used to set a lower boundto the critical temperature of quark hadron phase transition. The production and evolution ofstrangeness have been studied by using Boltzmann equation. The results have been contrastedwith the experimental data obtained by STAR collaboration at RHIC for Au + Au collisions at√sNN = 200 GeV. Our study reveals that the phi mesons freeze out at a temperature 160 MeV,a value close to the transition temperature for quark-hadron phase transition. Results are finallycompared with experimentally measured pion p T spectrum at RHIC.JK Nayak†, J Alam†, P Roy, AK Dutt-Mazumder, B Mohanty†HEP