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Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2006 Dec 15;97(24):241801. doi: 10.1103/PhysRevLett.97.241801. Epub 2006 Dec 12.
We report a measurement of the Bs(0) lifetime in the semileptonic decay channel Bs(0) --> Ds- mu+ nuX (and its charge conjugate), using approximately 0.4 fb(-1) of data collected with the D0 detector during 2002-2004. Using 5176 reconstructed Ds- mu+ signal events, we have measured the Bs(0) lifetime to be tau(Bs(0))=1.398+/-0.044(stat)(-0.025)(+0.028)(syst) ps. This is the most precise measurement of the Bs(0) lifetime to date.
