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Title: Measurement of V 0   production ratios in pp  collisions at s  √   = 0.9 and 7 TeV
Author: Calvo Gómez, Míriam
Camboni, Alessandro
Enterria i Adan, David G. d'
Garrido Beltrán, Lluís
Grabalosa Gándara, Marc
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
López Asamar, Elias
Musy, Marco
Pérez-Calero Yzquierdo, Antonio
Pie Valls, B. (Blai)
Potterat, Cédric
Puig Navarro, Albert
Ruiz, Hugo (Ruiz Pérez)
Vázquez Gómez, Ricard
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Hadrons
Teoria quàntica de camps
Teoria quàntica
Relativitat (Física)
Quantum field theory
Quantum theory
Relativity (Physics)
Issue Date: 2011
Publisher: Springer Verlag
Abstract: The Λ¯/Λ and Λ¯/K0S production ratios are measured by the LHCb detector from 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. Both ratios are presented as a function of transverse momentum, p T, and rapidity, y, in the ranges 0.15 < p T < 2.50 GeV/c and 2.0 < y < 4.5. Results at the two energies are in good agreement as a function of rapidity loss, ∆y = y beam − y, and are consistent with previous measurements. The ratio Λ¯/Λ , measuring the transport of baryon number from the collision into the detector, is smaller in data than predicted in simulation, particularly at high rapidity. The ratio Λ¯/K0S , measuring the baryon-to-meson suppression in strange quark hadronisation, is significantly larger than expected.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2011, vol. 8, num. 34, p. 1-22
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ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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