Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-01-01
Phys.Rev.C51:2135-2143,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages Postscript uuencoded tar-comprssed file, 9 Postscript figures uuencoded tar-compressed file
Scientific paper
10.1103/PhysRevC.51.2135
The boundary of a boson system plays an important role in determining the momentum distribution of the bosons. For a boson system with a cylindrical boundary, the momentum distribution is enhanced at high transverse momenta but suppressed at low transverse momenta, relative to a Bose-Einstein distribution. The boundary effects on systems of massless gluons and massive pions are studied. For gluons in a quark-gluon plasma, the presence of the boundary may modify the signals for the quark-gluon plasma. For pions in a pion system in heavy-ion collisions, Coulomb final-state interactions with the nuclear participants in the vicinity of the central rapidity region further modify the momentum distribution at low transverse momenta. By including both the boundary effect and the Coulomb final-state interactions we are able to account for the behavior of the $\pi^{-}$ transverse momentum spectrum observed in many heavy-ion experiments, notably at low transverse momenta.
Mostafa M. G. -H.
Wong Cheuk-Yin
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