Forward-backward multiplicity correlations in pp collisions at root s=0.9, 2.76 and 7 TeV
Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and
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and Zimmermann, M. B. and Zinovjev, G. and Zyzak, M. and ALICE
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Abstract
The strength of forward-backward (FB) multiplicity correlations is
measured by the ALICE detector in proton-proton (pp) collisions at =
0.9, 2.76 and 7 TeV. The measurement is performed in the central
pseudorapidity region (|eta| < 0.8) for the transverse momentum p (T) >
0.3 GeV/c. Two separate pseudorapidity windows of width (delta eta)
ranging from 0.2 to 0.8 are chosen symmetrically around eta = 0. The
multiplicity correlation strength (b (corr)) is studied as a function of
the pseudorapiditty gap (eta (gap)) between the two windows as well as
the width of these windows. The correlation strength is found to
decrease with increasing eta (gap) and shows a non-linear increase with
delta eta. A sizable increase of the correlation strength with the
collision energy, which cannot be explained exclusively by the increase
of the mean multiplicity inside the windows, is observed. The
correlation coefficient is also measured for multiplicities in different
configurations of two azimuthal sectors selected within the symmetric FB
eta-windows. Two different contributions, the short-range (SR) and the
long-range (LR), are observed. The energy dependence of b (corr) is
found to be weak for the SR component while it is strong for the LR
component. Moreover, the correlation coefficient is studied for
particles belonging to various transverse momentum intervals chosen to
have the same mean multiplicity. Both SR and LR contributions to b
(corr) are found to increase with p (T) in this case. Results are
compared to PYTHIA and PHOJET event generators and to a string-based
phenomenological model. The observed dependencies of b (corr) add new
constraints on phenomenological models.... Show more Show less