The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p/p, /, + /− and + /− 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 par- ticle production in pp collisions. The energy dependence of p/p, /, + /− and + /− , reaching values compatible with unity for √s = 7 TeV, complement the earlier p/p measurement of ALICE. These dependencies can be de- scribed by exchanges with the Regge-trajectory intercept of αJ ≈ 0.5, which are suppressed with increasing rapidity interval Dy. Any significant contribution of an exchange not suppressed at large Dy (reached at LHC energies) is disfavoured.

Mid-rapidity anti-baryon to baryon ratios in pp collisions at $\sqrt{s} = 0.9,\ 2.76\mbox{ and }7\mbox{ TeV}$ measured by ALICE

ARNALDI, Roberta;BALA, RENU;BEOLE', Stefania;BERZANO, DARIO CARLO DOMENICO;BIANCHI, LIVIO;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;LEONCINO, MARCO;MARCHISONE, MASSIMILIANO;MASERA, Massimo;MILANO, LEONARDO;OPPEDISANO, Chiara;RAMELLO, Luciano;RUSSO, RICCARDO;SITTA, Mario;VALLERO, Sara;VERCELLIN, Ermanno;
2013-01-01

Abstract

The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p/p, /, + /− and + /− 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 par- ticle production in pp collisions. The energy dependence of p/p, /, + /− and + /− , reaching values compatible with unity for √s = 7 TeV, complement the earlier p/p measurement of ALICE. These dependencies can be de- scribed by exchanges with the Regge-trajectory intercept of αJ ≈ 0.5, which are suppressed with increasing rapidity interval Dy. Any significant contribution of an exchange not suppressed at large Dy (reached at LHC energies) is disfavoured.
2013
73
2496
2496
http://arxiv.org/abs/1305.1562v1
antibaryon to baryon ratio; mid-rapidity; heavy ion collisions
E. Abbas;B. Abelev;J. Adam;D. Adamová;A. M. Adare;M. M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. G. Agocs;A. Agostinelli;Z. Ahammed;N. Ah...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/138817
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