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Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Comerma Montells, Albert; Domingo Bonal, Francesc; Garrido Beltrán, Lluís; Gascón Fora, David; Grabalosa Gándara, Marc; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; López Asamar, Elias; Pérez-Calero Yzquierdo, Antonio; Picatoste Olloqui, Eduardo; Pie Valls, B. (Blai); Potterat, Cédric; Puig Navarro, Albert; Roselló, M; Ruiz, Hugo (Ruiz Pérez); Vázquez Gómez, Ricard; Vilasis-Cardona, Xavier; LHCb Collaboration
The European physical journal. C, Particles and fields, 11/2012, Volume: 72, Issue: 10Journal Article
The charged-particle production ratios p¯/p, K −/K +, π −/π +, (p+p¯)/(π++π−), (K ++K −)/(π ++π −) and (p+p¯)/(K++K−) are measured with the LHCb detector using 0.3 nb−1 of pp collisions delivered by the LHC at s√=0.9 TeV and 1.8 nb−1 at s√=7 TeV. The measurements are performed as a function of transverse momentum p T and pseudorapidity η. The production ratios are compared to the predictions of several Monte Carlo generator settings, none of which are able to describe adequately all observables. The ratio p¯/p is also considered as a function of rapidity loss, Δy≡y beam−y, and is used to constrain models of baryon transport.
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