Measurement of the Λ0 b lifetime and mass in the ATLAS experiment

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdelalim, A. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acerbi, E. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, P. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Ahsan, M. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Measurement of the Λ0 b lifetime and mass in the ATLAS experiment. PHYSICAL REVIEW D, 87 (3). ISSN 2470-0010

Preview

Text 1207.2284v3.pdf Available under License Creative Commons Attribution. Download (882kB) | Preview

Abstract

A measurement of the Λ0 b lifetime and mass in the decay channel Λ0 b → J/ψ(μ+μ−)Λ0(pπ−) is presented. The analysis uses a signal sample of about 2200 Λ0 b and ¯Λ0 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 Λ0 b 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.

Actions (login required)

Edit Item