Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-09-16
J.Phys.Conf.Ser.270:012022,2011
Physics
High Energy Physics
High Energy Physics - Experiment
Hot Quarks 2010 conference proceedings, to appear in Journal of Physics: Conference Series (JPCS)
Scientific paper
10.1088/1742-6596/270/1/012022
Two particle correlations are used to extract information about the characteristic size of the system for proton-proton collisions at 900 GeV measured by the ALICE (A Large Ion Collider experiment) detector at CERN. The correlation functions obtained show the expected Bose-Einstein effect for identical particles, but there are also long range correlations present that shift the baseline from the expected flat behavior. A possible source of these correlations is the conservation of energy and momentum, especially for small systems, where the energy available for particle production is limited. A new technique, first introduced by the STAR collaboration, of quantifying these long range correlations using energy-momentum conservation considerations is presented here. It is shown that the baseline of the two particle correlation function can be described using this technique.
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