1,271 research outputs found
Relative space-time asymmetries in pion and nucleon production in non-central nucleus-nucleus collisions at high energies
We propose to use the ratio of the pion-proton correlation functions
evaluated under different conditions to study the relative space-time
asymmetries in pion and proton emission (pion and nucleon source relative
shifts) in high energy heavy ion collision. We address the question of the
non-central collisions, where the sources can be shifted spatially both in the
longitudinal and in the transverse directions in the reaction plane. We use the
RQMD event generator to illustrate the effect and the technique.Comment: RevTex, 4 pages, 3 figures included as eps file
A systematic study of two particle correlations from NA49 at CERN SPS
A systematic study of two particle correlations measured by the NA49
experiment is summarized. Radii from Bose Einstein interferometry have been
determined separately in different parts of phase space, for different
collision systems and at different incident beam energies. Moreover, first
results of a new method of accessing space-time asymmetries in the emission of
particles by means of non identical particle correlations are presented.Comment: 4 pages 3 figures publ. in proc. of QM99, Torino It Nuclear Physics
Sum rule of the correlation function
We discuss a sum rule satisfied by the correlation function of two particles
with small relative momenta. The sum rule, which results from the completeness
condition of the quantum states of the two particles, is first derived and then
we check how it works in practice. The sum rule is shown to be trivially
satisfied by free particle pair, and then there are considered three different
systems of interacting particles. We discuss a pair of neutron and proton in
the s-wave approximation and the case of the so-called hard spheres with the
phase shifts taken into account up to l=4. Finally, the Coulomb system of two
charged particles is analyzed.Comment: 18 pages, 18 figures, revised, to appear in Phys. Rev.
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