A measurement of the $𝛬^0_b$ lifetime and mass in the decay channel $𝛬^0_𝑏→𝐽/𝜓(𝜇^+𝜇^−)𝛬^0(𝑝𝜋^−)$ is presented. The analysis uses a signal sample of about 2200 $𝛬^0_𝑏$ and $\overline{𝛬}^0_𝑏$ 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 $𝛬^0_𝑏$ lifetime and mass. They are measured to be $𝜏_{𝛬𝑏}=1.449±0.036(stat)±0.017(syst) ps$ and $𝑚_{𝛬𝑏}=5619.7±0.7(stat)±1.1(syst) MeV$.
Author
Aad, G. : Albert-Ludwigs-Universität
Abajyan, T. : University of Bonn
Abbott, B. : University of Oklahoma
Abdallah, J. : Universitat Autònoma de Barcelona
Abdel Khalek, S. : Université Paris-Sud
Abdelalim, A. A. : Université de Genève
Abdinov, O. : Azerbaijan Academy of Sciences
Aben, R. : University of Amsterdam
Abi, B. : Oklahoma State University
Abolins, M. : Michigan State University
AbouZeid, O. S. : University of Toronto
Abramowicz, H. : Tel Aviv University
Abreu, H. : Université Paris-Sud
Acerbi, E. : INFN Sezione di Milano
Acharya, B. S. : Università di Udine
Adamczyk, L. : AGH University of Science and Technology
Adams, D. L. : Brookhaven National Laboratory
Addy, T. N. : Hampton University
Adelman, J. : Yale University
Anderson, K. J. : University of Chicago
Boveia, A. : University of Chicago
Canelli, F. : University of Chicago
Choudalakis, G. : University of Chicago
Costin, T. : University of Chicago
Fiascaris, M. : University of Chicago
Gardner, R. W. : University of Chicago
Gupta, A. : University of Chicago
Jen-La Plante, I. : University of Chicago
Kapliy, A. : University of Chicago
Melachrinos, C. : University of Chicago
Merritt, F. S. : University of Chicago
Meyer, C. : University of Chicago
Miller, D. W. : University of Chicago
Okumura, Y. : University of Chicago
Onyisi, P. U. E. : University of Chicago
Oreglia, M. J. : University of Chicago
Penning, B. : University of Chicago
Pilcher, J. E. : University of Chicago
Shochet, M. J. : University of Chicago
Tompkins, L. : University of Chicago
Tuggle, J. M. : University of Chicago
Vukotic, I. : University of Chicago
