| Thème(s) : |
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Physique/Physique des Hautes Energies - Expérience
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| Titre : |
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Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV |
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| Auteur : |
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R. Aaij, S. Barsuk1, O. Callot1, J. He1, B. Jean-Marie1, J. Lefrançois1, F. Machefert1, A. Martin Sanchez1, M. Nicol1, P. Robbe1, M.-H. Schune1, B. Viaud1, I. Videau1, E. Ben-Haim2, M. Benayoun2, P. David2, L. Del Buono2, A. Martens2, Z. Ajaltouni3, E. Cogneras3, O. Deschamps3, I. El Rifai3, P. Henrard3, M. Hoballah3, M. Jahjah Hussein3, R. Lefèvre3, L. Li Gioi3, S. Monteil3, V. Niess3, P. Perret3, D. Roa Romero3, K. Sobczak3, C. Adrover4, E. Aslanides4, J. Cogan4, R. Legac4, O. Leroy4, G. Mancinelli4, E. Maurice4, M. Perrin-Terrin4, M. Sapunov4, J. Serrano4, A. Tsaregorodtsev4, I. De Bonis5, D. Decamp5, P. Ghez5, P. Hopchev5, J.P. Lees5, I. Machikhiliyan5, M.N. Minard5, B. Pietrzyk5, S. T'Jampens5, V. Tisserand5, E. Tournefier5 |
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| Laboratoire : |
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| Résumé : |
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The 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. |
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| Collaboration/Projet : |
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LHCb |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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| European Physical Journal C: Particles and Fields (Eur. Phys. J. C) |
| Publisher |
EDP Sciences: EPJ |
| ISSN |
1434-6044 (eISSN : 1434-6052) |
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| Volume : |
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72 |
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| Page/Article : |
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2168 |
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| Identifiant local : |
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LHCb-PAPER-2011-037; CERN-PH-EP-2012-171 |
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| Commentaire : |
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30 pages, 10 figures - See paper for full list of authors |
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