Forward-backward multiplicity correlations in pp collisions at √s = 0.9, 2.76 and 7 TeV
ALICE Collaboration. (2015). Forward-backward multiplicity correlations in pp collisions at √s = 0.9, 2.76 and 7 TeV. Journal of High Energy Physics, 2015(5), Article 97. https://doi.org/10.1007/JHEP05(2015)097
Julkaistu sarjassa
Journal of High Energy PhysicsTekijät
Päivämäärä
2015Tekijänoikeudet
© CERN, for the benefit of the ALICE Collaboration. Published by Springer. JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0.
The strength of forward-backward (FB) multiplicity correlations is measured
by the ALICE detector in proton-proton (pp) collisions at √
s = 0.9, 2.76 and 7 TeV.
The measurement is performed in the central pseudorapidity region (|η| < 0.8) for the
transverse momentum pT > 0.3 GeV/c. Two separate pseudorapidity windows of width
(δη) ranging from 0.2 to 0.8 are chosen symmetrically around η = 0. The multiplicity
correlation strength (bcorr) is studied as a function of the pseudorapidity gap (ηgap) between
the two windows as well as the width of these windows. The correlation strength is found
to decrease with increasing ηgap and shows a non-linear increase with δη. 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 η-windows. Two different contributions, the
short-range (SR) and the long-range (LR), are observed. The energy dependence of bcorr 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
bcorr are found to increase with pT in this case. Results are compared to PYTHIA and
PHOJET event generators and to a string-based phenomenological model. The observed
dependencies of bcorr add new constraints on phenomenological models.
...
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Springer Berlin HeidelbergISSN Hae Julkaisufoorumista
1126-6708Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/24746025
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