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JET FINDING IN FUTURE HEAVY ION COLLIDER EXPERIMENTS

                              I.P.Lokhtin        
          Nuclear Physics Institute of Moscow State University               
                         119899, Moscow, RUSSIA

No Paper Submitted

                Abstract

The main goal of future heavy ion collider experiments is to achive the deconfinement of hadronic matter and to study the properties of created quark-gluon plasma. High-transverse momentum jets (partons) are produced at the very beginning of the collision process, they propogate through the plasma interacting with the plasma constituents and escape from the plasma (long before the completion of mixed phase) carring information about medium created in the collision. So the search of possible probe of plasma result in necessity to extract such jets from large soft and mini-jet multiplicity background.

We have developed effective jet-finding algorithm for nuclei collisions to decrease the influence of large number of "false" jets and to reconsruct "true" high-transverse momentum jets from hard parton-parton scattering. The "thermal events" were simulated for the case of central S-S collisions at energy of future LHC accelerator (c.m.s. energy 6.3 A TeV) to estimate the "false" jets background; the hard gluon-gluon scattering was superimposed on the "thermal event" to investigate the possibility of such dijet reconstruction. Besides we have test a sensitivity of the dijet acoplanarity (amount of momentum orthogonal to the initial hard scattering plane) distribution to rescattering of hard partons on plasma constituents in LHC conditions. It seems promising to use the acoplanarity distribution shape as a tool for determination of the plasma temperature in future ultrarelativistic ion collider experiments.

Submitter's  Name: Igor P. Lokhtin
Submitter's Institution: Nuclear Physics Institute Moscow State University
Address of Institution: 119899, Moscow, RUSSIA, Leninskie Gory, NPI MSU
Submitter's EMAIL address: igor@alex.npi.msu.su
Submitter's Telephone number and/or FAX number:
            phone (7-095) 939-12-57   fax (7-095) 939-58-88
Authors of the Paper each with Institution (and Experiment Affiliation, if any):
            N.A.Kruglov, I.P.Lokhtin
Topic area: Simulation and algorithms