Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

G. Aad S. Aoun 1 C. P. Bee 1 C. Bertella 1 N. Bousson 1 J. C. Clémens 1 Y. Coadou 1 F. Djama 1 F. Etienne 1 L. Feligioni 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 J. Maurer 1 E. Monnier 1 J. Odier 1 P. Pralavorio 1 A. Rozanov 1 M. Talby 1 N. Tannoury 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 L. Vacavant 1 S. Abdel Khalek 2 H. Abreu 2 N. Andari 2 C. Arnault 2 E. Augé 2 P. Barrillon 2 M. Benoit 2 S. Binet 2 C. Bourdarios 2 C. De La Taille 2 J.B. De Vivie De Regie 2 L. Duflot 2 M. Escalier 2 L. Fayard 2 D. Fournier 2 J.-F. Grivaz 2 S. Henrot-Versillé 2 J. Hrivnac 2 L. Iconomidou-Fayard 2 J. Idarraga 2 M. Kado 2 N. Lorenzo Martinez 2 A. Lounis 2 N. Makovec 2 P. Matricon 2 F. Niedercorn 2 L. Poggioli 2 P. Puzo 2 A. Renaud 2 D. Rousseau 2 G. Rybkin 2 J.B. Sauvan 2 J. Schaarschmidt 2 A.C. Schaffer 2 L. Serin 2 S. Simion 2 R. Tanaka 2 M. Teinturier 2 J.J. Veillet 2 I. Vukotic 2 F. Wicek 2 D. Zerwas 2 Z. Zhang 2 C. Biscarat 3 E. Cogneras 3 G. Rahal 3 S. Albrand 4 Q. Buat 4 B. Clement 4 J. Collot 4 S. Crépé-Renaudin 4 B. Dechenaux 4 T. Delemontex 4 P.A. Delsart 4 M.H. Genest 4 J.Y. Hostachy 4 E. Laisne 4 F. Ledroit-Guillon 4 A. Lleres 4 A. Lucotte 4 F. Malek 4 J. Stark 4 X. Sun 4 B. Trocmé 4 J. Wang 4 C. Weydert 4 L. Aperio Bella 5 B. Aubert 5 N. Berger 5 J. Colas 5 M. Delmastro 5 L. Di Ciaccio 5 T.K.O. Doan 5 S. Elles 5 C. Goy 5 T. Hryn'Ova 5 S. Jézéquel 5 M. Kataoka 5 J. Labbe 5 R. Lafaye 5 J. Leveque 5 V.P. Lombardo 5 N. Massol 5 P. Perrodo 5 E. Petit 5 H. Przysiezniak 5 E. Richter-Was 5 G. Sauvage 5 E. Sauvan 5 M. Schwoerer 5 T. Todorov 5 D. Tsionou 5 I. Wingerter-Seez 5 R. Zitoun 5 D. Boumediene 6 E. Busato 6 D. Calvet 6 S. Calvet 6 R. Camacho Toro 6 Diane Cinca 7 J. Donini 6 R. Febbraro 6 N. Ghodbane 6 C. Guicheney 6 H. Liao 6 D. Pallin 6 D. Paredes Hernandez 6 F. Podlyski 6 C. Santoni 6 F. Vazeille 6 F. Vannucci 8
Abstract : 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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Journal articles
Physical Review D, American Physical Society, 2013, 87, pp.032002. <10.1103/PhysRevD.87.032002>


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G. Aad, S. Aoun, C. P. Bee, C. Bertella, N. Bousson, et al.. Measurement of the Lambda_b lifetime and mass in the ATLAS experiment. Physical Review D, American Physical Society, 2013, 87, pp.032002. <10.1103/PhysRevD.87.032002>. <in2p3-00716649>

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