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Measurement of the Λb0 lifetime and mass in the ATLAS experiment

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physical Review. D. 2013, vol. 87, no. 03, 032002
Abstract A measurement of the Λ0b lifetime and mass in the decay channel Λ0b→J/ψ(μ+μ−)Λ0(pπ−) is presented. The analysis uses a signal sample of about 2200 Λ0b and Λ0b 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 Λ0b lifetime and mass. They are measured to be τΛb=1.449±0.036(stat)±0.017(syst)  ps and mΛb=5619.7±0.7(stat)±1.1(syst)  MeV.
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ATLAS COLLABORATION. Measurement of the Λb0 lifetime and mass in the ATLAS experiment. In: Physical Review. D, 2013, vol. 87, n° 03, p. 032002. doi: 10.1103/PhysRevD.87.032002 https://archive-ouverte.unige.ch/unige:40653

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Deposited on : 2014-10-03

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