Measurement of prompt hadron production ratios in pp collisions at √s = 0.9 and 7 TeV

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2012-11, Vol.72 (10)
• Main Authors: 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
• Format: Article
• Language: English
• Subjects: Astrofísica; Astronomia; Astronomy; Astrophysics; Energia nuclear; Exact sciences and technology; Física nuclear; Hadrons; Nuclear energy; Nuclear physics; Physics; Quantum field theory; Teoria quàntica de camps; The physics of elementary particles and fields
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-012-2168-x

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.