Mid-rapidity anti-baryon to baryon ratios in pp collisions at sqrt(s) = 0.9, 2.76 and 7 TeV measured by ALICE - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal C: Particles and Fields Year : 2013

Mid-rapidity anti-baryon to baryon ratios in pp collisions at sqrt(s) = 0.9, 2.76 and 7 TeV measured by ALICE

E. Abbas
  • Function : Author
C. Roy
Laurent Aphecetche
Guillaume Batigne
B. Erazmus
  • Function : Author
  • PersonId : 1178907
  • IdRef : 033726485
Magali Estienne
Marie Germain
Gines Martinez Garcia
Philippe Pillot
Alexandre Shabetai
Diego Stocco
B. Cheynis
Maxime Guilbaud

Abstract

The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for anti-p/p, anti-\Lambda/\Lambda, anti-\Xi+/\Xi- and anti-\Omega+/\Omega- in pp collisions at sqrt(s) = 0.9, 2.76 and 7TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of anti-p/p, anti-\Lambda/\Lambda, anti-\Xi+/\Xi- and anti-\Omega+/\Omega-, reaching values compatible with unity for sqrt(s) = 7TeV, complement the earlier anti-p/p measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of \alpha_j ~ 0.5, which are suppressed with increasing rapidity interval \Delta y. Any significant contribution of an exchange not suppressed at large \Delta y (reached at LHC energies) is disfavoured.

Dates and versions

in2p3-00821780 , version 1 (13-05-2013)

Identifiers

Cite

E. Abbas, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. Mid-rapidity anti-baryon to baryon ratios in pp collisions at sqrt(s) = 0.9, 2.76 and 7 TeV measured by ALICE. European Physical Journal C: Particles and Fields, 2013, 73, pp.2496. ⟨10.1140/epjc/s10052-013-2496-5⟩. ⟨in2p3-00821780⟩
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