title: Forward-backward multiplicity correlations in pp collisions at  $\sqrt{s}$=0.9, 2.76 and 7 TeV
metadata.name: dc.contributor.author
metadata.value: ALICE Collaboration
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2016-03-09T13:32:58Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2016-03-09T13:32:58Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2015-02-01
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1007/JHEP05(2015)097
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/1844
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The strength of forward-backward (FB) multiplicity correlations is measured
  by the ALICE detector in proton-proton (pp) collisions at $\sqrt{s}=0.9$, 2.76
  and 7 TeV. The measurement is performed in the central pseudorapidity region
  ($|\eta| < 0.8$) for the transverse momentum $p_{\rm T}>0.3$ 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 ($b_{\rm cor}$) is studied as a function of the pseudorapidity gap
  ($\eta_{\rm gap}$) between the two windows as well as the width of these
  windows. The correlation strength is found to decrease with increasing
  $\eta_{\rm gap}$ 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 $b_{\rm cor}$ 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 $b_{\rm cor}$ are found
  to increase with $p_{\rm T}$ in this case. Results are compared to PYTHIA and
  PHOJET event generators and to a string-based phenomenological model. The
  observed dependencies of $b_{\rm cor}$ add new constraints on phenomenological
  models.
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Nuclear Experiment
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Nuclear Experiment
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Forward-backward multiplicity correlations in pp collisions at  $\sqrt{s}$=0.9, 2.76 and 7 TeV
metadata.lang: en_GB
resources.filename: FB_in_pp_ALICE.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/1844/1/FB_in_pp_ALICE.pdf
resources.format: Adobe PDF
resources.size: 1,22 MB