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Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV

By R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, J. Lefrançois, F. Machefert, A. Martin Sanchez, M. Nicol, P. Robbe, M.-H. Schune, B. Viaud, I. Videau, E. Ben-Haim, M. Benayoun, P. David, L. Del Buono, A. Martens, Ziad Ajaltouni, E. Cogneras, O. Deschamps, I. El Rifai, Pierre Henrard, M. Hoballah, Marwa Jahjah-Hussein, R. Lefèvre, L. Li Gioi, S. Monteil, V. Niess, Pascal Perret, Diego Alejandro Roa Romero, Krzysztof Grzegorz Sobczak, C. Adrover, E. Aslanides, J. Cogan, R. Legac, O. Leroy, G. Mancinelli, E. Maurice, M. Perrin-Terrin, M. Sapunov, J. Serrano, A. Tsaregorodtsev, I. De Bonis, D. Decamp, P. Ghez, P. Hopchev, J.P. Lees, I. Machikhiliyan, M.N. Minard, B. Pietrzyk, S. T'Jampens, V. Tisserand and E. Tournefier

Abstract

30 pages, 10 figures - See paper for full list of authorsThe charged-particle production ratios $\bar{p}/p$, $K^-/K^+$, $\pi^-/\pi^+$, $(p + \bar{p})/(\pi^+ + \pi^-)$, $(K^+ + K^-)/(\pi^+ + \pi^-)$ and $(p + \bar{p})/(K^+ + K^-)$ are measured with the LHCb detector using $0.3\,{\rm nb^{-1}}$ of $pp$ collisions delivered by the LHC at $\sqrt{s} = 0.9$ TeV and $1.8\,{\rm nb^{-1}}$ at $\sqrt{s} = 7$ TeV. The measurements are performed as a function of transverse momentum $p_{\rm T}$ and pseudorapidity $\eta$. 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 $\bar{p}/p$ is also considered as a function of rapidity loss, $\Delta y \equiv y_{\rm beam} - y$, and is used to constrain models of baryon transport

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'Springer Science and Business Media LLC'
Year: 2012
DOI identifier: 10.1140/epjc/s10052-012-2168-x
OAI identifier: oai:HAL:in2p3-00711512v1
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