2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

B_s^0 lifetime measurements from the D0 experiment

5 Jul 2014, 16:45
Sala 3+4 ()

Sala 3+4

Oral presentation Flavour Physics Flavour Physics


Prof. et al. D0 Collaboration (Fermi National Accelerator Laboratory)


We present new lifetime measurements of B mesons, using 10.4 fb-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. We report an update of the B_s^0 lifetime in semi-inclusive flavor-specific decays B_s^0 -> mu nu D_s X (and charge conjugate). We account for the missing energy from the neutrino and other possible undetected decay products using simulation. The same analysis also determines the B^0 lifetime in the corresponding decay mode B^0 -> mu nu D- X and from these two measurements, we report the most precise extraction of the lifetime ratio tau(B_s^0)/tau(B^0), which agrees with lattice QCD predictions. In addition, we analyse the fully-reconstructed CP-odd decay B_s^0 -> J/psi f_0(980), and extract the lifetime of this B_s^0 state, which is associated with the heavy mass eigenstate in the absence of CP violation. We perform a multi-dimensional unbinned fit of the mass, lifetime, and lifetime uncertainty, and account for contamination from several peaking backgrounds close to the signal mass range.

Primary author

Prof. et al. D0 Collaboration (Fermi National Accelerator Laboratory)

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