TY - JOUR
T1 - Mid-rapidity anti-baryon to baryon ratios in pp collisions at root s=0.9, 2.76 and 7 TeV measured by ALICE
AU - Abbas, E.
AU - Abelev, B.
AU - Adam, J.
AU - Adamova, D.
AU - Adare, A.M.
AU - Bearden, Ian
AU - Bøggild, Hans
AU - Christensen, Christian Holm
AU - Dalsgaard, Hans Hjersing
AU - Gulbrandsen, Kristjan Herlache
AU - Bilandzic, Ante
AU - Gaardhøje, Jens Jørgen
AU - Hansen, Alexander Colliander
AU - Nielsen, Børge Svane
AU - Nygaard, Casper
AU - Søgaard, Carsten
PY - 2013/7/1
Y1 - 2013/7/1
N2 - The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p̄/p, Λ/Λ, Ξ+/Ξ- and Ω+/Ω- in pp collisions at √s = 0.9, 2.76 and 7 TeV, 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 p̄/p, Λ/Λ, Ξ+/Ξ- and Ω+/Ω-, reaching values compatible with unity for √s = 7 TeV measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of αj ≈ 0.5, which are suppressed with increasing rapidity interval Δy. Any significant contribution of an exchange not suppressed at large Δy (reached at LHC energies) is disfavoured.
AB - The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p̄/p, Λ/Λ, Ξ+/Ξ- and Ω+/Ω- in pp collisions at √s = 0.9, 2.76 and 7 TeV, 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 p̄/p, Λ/Λ, Ξ+/Ξ- and Ω+/Ω-, reaching values compatible with unity for √s = 7 TeV measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of αj ≈ 0.5, which are suppressed with increasing rapidity interval Δy. Any significant contribution of an exchange not suppressed at large Δy (reached at LHC energies) is disfavoured.
U2 - 10.1140/epjc/s10052-013-2496-5
DO - 10.1140/epjc/s10052-013-2496-5
M3 - Journal article
SN - 1434-6044
VL - 73
JO - The European Physical Journal C: Particles and Fields
JF - The European Physical Journal C: Particles and Fields
IS - 7
M1 - 2496
ER -