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

E Abbas Nelson Carlin Filho; Gabriel Oliveira Valeriano de Barros; Airton Deppman; Marcel Araujo Silva Figueredo; Cristiane Jahnke; Denise Aparecida Moreira de Godoy; Marcelo Gameiro Munhoz; Antonio Carlos Oliveira da Silva; Elienos Pereira de Oliveira Filho; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo

São Paulo 2013

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Título:
Mid-rapidity anti-baryon to baryon ratios in pp collisions at √ s = 0.9, 2.76 and 7 TeV measured by ALICE
Autor: E Abbas
Nelson Carlin Filho; Gabriel Oliveira Valeriano de Barros; Airton Deppman; Marcel Araujo Silva Figueredo; Cristiane Jahnke; Denise Aparecida Moreira de Godoy; Marcelo Gameiro Munhoz; Antonio Carlos Oliveira da Silva; Elienos Pereira de Oliveira Filho; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo
Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
Notas: arXiv.1305.1562
Descrição: The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p/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 p/p, Λ/Λ, Ξ + /Ξ − and Ω + /Ω−, reaching values compatible with unity for √ s = 7 TeV, complement the earlier p/p 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 ∆y. Any signiﬁcant contribution of an exchange not suppressed at large ∆y (reached at LHC energies) is disfavoured.
Editor: São Paulo
Data de criação/publicação: 2013
Formato: 33 p.
Idioma: Inglês

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

São Paulo 2013

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