Influence of Impact Parameter Fluctuations on Transverse Momentum Fluctuations

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dc.creatorGrebieszkow, Katarzyna
dc.date2007-10-18
dc.date2008-07-25
dc.date.accessioned2026-07-07T11:12:23Z
dc.date.available2026-07-07T11:12:23Z
dc.descriptionThe preliminary NA49 results on the energy dependence of transverse momentum fluctuations over the whole SPS energy range exhibit an unexpected effect. The $Φ_{p_{T}}$ fluctuation measure - used by the NA49 experiment - manifests a different behavior for different charge combinations. Whereas the $Φ_{p_{T}}$ is consistent with zero and independent of energy for negatively charged particles, it significantly increases for both all charged and positively charged particles at lower SPS energies. The string-hadronic model UrQMD is applied here to explain this effect. The UrQMD simulations show that the number of protons is strongly correlated with impact parameter and that the event-by-event impact parameter fluctuations are responsible for the event-by-event transverse momentum fluctuations of positively charged and all charged particles where protons are included. The observations presented in this article are important for all experiments measuring event-by-event fluctuations, especially for those using all charged particles in the analysis. The results can be also crucial for detectors with acceptances extending to the beam/target spectator domains.
dc.descriptionErrata: Section 4, the end of the first paragraph - sentence in brackets modified
dc.identifierhttps://arxiv.org/abs/0710.3594
dc.identifierhttp://arxiv.org/abs/0710.3594
dc.identifierPhys.Rev.C76:064908,2007
dc.identifierdoi:10.1103/PhysRevC.76.064908
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191367
dc.subjectNuclear Experiment
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleInfluence of Impact Parameter Fluctuations on Transverse Momentum Fluctuations
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