Tuesday, May 7, 2013

1305.0857 (V. V. Vechernin)

Dependence of the forward-backward multiplicity correlation on
acceptance and distance between windows in rapidity and azimuth
   [PDF]

V. V. Vechernin
The forward-backward (FB) multiplicity correlations in two windows separated in rapidity and azimuth are analyzed in the framework of the model with independent identical emitters (strings). Along with the short-range contribution, originating from the correlation between multiplicities produced by a single emitter, the long-range contribution, originating from the fluctuation in the number of strings, is taken into account. The dependencies of the correlation coefficient on the rapidity and azimuthal acceptance of the windows and on the corresponding gaps between them are studied. It is shown that the analysis of these dependencies enables to separate the contributions of two above mechanisms. We see that the presence of the pair correlations between particles produced by one string turns the strings into non-poissonian emitters. The connection of the FB multiplicity correlation coefficient with the double inclusive cross section, the two-particle correlation function and the so-called untriggered di-hadron correlation is also traced. The suitable observables are proposed.
View original: http://arxiv.org/abs/1305.0857

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