Observation of B⁰_s-Bbar⁰_s oscillations in CDF II

by PAUS, C. (Cambridge University)

Tuesday 13 Jun 2006, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

We report a measurement of the B⁰_s-Bbar⁰_s oscillation frequency using the CDF II Detector operating at the Fermilab Tevatron. This result is derived from 1 \rm fb^-1 of pbarp collisions at √s =1.96 \rm TeV. We use semileptonic and hadronic B_s meson decays and observe a signature consistent with B⁰_s-Bbar⁰_s oscillations. The probability that background could fluctuate to mimic such a signature is 0.5%. Under the hypothesis that this is a signal for B⁰_s-Bbar⁰_s oscillations, we measure Δm_s = 17.33^+0.42_-0.21 (stat.) ± 0.07 (syst.) hbar \rm ps^-1. When combined with the world average value for Δm_d this yields  |V_td| |V_ts| = 0.209^+0.005_-0.008.

Organiser(s): Rolf Landua / DSU

Note: * Tea & coffee will be served at 16:00.

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