| Thème(s) : |
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Physique/Physique des Hautes Energies - Expérience
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| Titre : |
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Measurement of the Lambda_b lifetime and mass in the ATLAS experiment |
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| Auteur : |
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G. Aad, S. Aoun1, C. P. Bee1, C. Bertella1, N. Bousson1, J. C. Clémens1, Y. Coadou1, F. Djama1, F. Etienne1, L. Feligioni1, D. Hoffmann1, F. Hubaut1, E. B. F. G. Knoops1, E. Le Guirriec1, B. Li1, J. Maurer1, E. Monnier1, J. Odier1, P. Pralavorio1, A. Rozanov1, M. Talby1, N. Tannoury1, S. Tisserant1, J. Toth1, F. Touchard1, L. Vacavant1, S. Abdel Khalek2, H. Abreu2, N. Andari2, C. Arnault2, E. Augé2, P. Barrillon2, M. Benoit2, S. Binet2, C. Bourdarios2, C. de La Taille2, J.B. De Vivie De Regie2, L. Duflot2, M. Escalier2, L. Fayard2, D. Fournier2, J.-F. Grivaz2, S. Henrot-Versillé2, J. Hrivnac2, L. Iconomidou-Fayard2, J. Idarraga2, M. Kado2, N. Lorenzo Martinez2, A. Lounis2, N. Makovec2, P. Matricon2, F. Niedercorn2, L. Poggioli2, P. Puzo2, A. Renaud2, D. Rousseau2, G. Rybkin2, J.B. Sauvan2, J. Schaarschmidt2, A.C. Schaffer2, L. Serin2, S. Simion2, R. Tanaka2, M. Teinturier2, J.J. Veillet2, I. Vukotic2, F. Wicek2, D. Zerwas2, Z. Zhang2, C. Biscarat3, E. Cogneras3, G. Rahal3, S. Albrand4, Q. Buat4, B. Clement4, J. Collot4, S. Crépé-Renaudin4, B. Dechenaux4, T. Delemontex4, P.A. Delsart4, M.H. Genest4, J.Y. Hostachy4, E. Laisne4, F. Ledroit-Guillon4, A. Lleres4, A. Lucotte4, F. Malek4, J. Stark4, X. Sun4, B. Trocmé4, J. Wang4, C. Weydert4, L. Aperio Bella5, B. Aubert5, N. Berger5, J. Colas5, M. Delmastro5, L. Di Ciaccio5, T.K.O. Doan5, S. Elles5, C. Goy5, T. Hryn'Ova5, S. Jézéquel5, M. Kataoka5, J. Labbe5, R. Lafaye5, J. Leveque5, V.P. Lombardo5, N. Massol5, P. Perrodo5, E. Petit5, H. Przysiezniak5, E. Richter-Was5, G. Sauvage5, E. Sauvan5, M. Schwoerer5, T. Todorov5, D. Tsionou5, I. Wingerter-Seez5, R. Zitoun5, D. Boumediene6, E. Busato6, D. Calvet6, S. Calvet6, R. Camacho Toro6, D. Cinca6, J. Donini6, R. Febbraro6, N. Ghodbane6, C. Guicheney6, H. Liao6, D. Pallin6, D. Paredes Hernandez6, F. Podlyski6, C. Santoni6, F. Vazeille6, F. Vannucci7, 8 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - Neutrinos |
| Résumé : |
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A measurement of the Lambda_b lifetime and mass in the decay channel Lambda_b -> J/psi(mu^+ mu^-) Lambda^0(p pi^-) is presented. The analysis uses a signal sample of about 2200 Lambda_b and anti-Lambda_b decays that are reconstructed in 4.9 fb^-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda_b lifetime and mass. They are measured to be tau(Lambda_b) = 1.449 ± 0.036(stat) ± 0.017(syst) ps andm(Lambda_b) = 5619.7 ± 0.7(stat) ± 1.1(syst) MeV. |
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| Collaboration/Projet : |
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ATLAS |
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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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2013 |
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| Nom du périodique : |
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| Physical Review D (Phys. Rev. D) |
| Publisher |
American Physical Society |
| ISSN |
1550-7998 (eISSN : 1550-2368) |
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| Volume : |
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87 |
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| Page/Article : |
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032002 |
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| Identifiant local : |
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CERN-PH-EP-2012-163 ; LPSC12191 |
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| Commentaire : |
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7 pages plus author list (20 pages total), 3 figures, 2 tables, submitted to Physical Review D - See paper for full list of authors |
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