Evidence for the Decay B_s⁰ → D_s^(*)D_s^(*) and a Measurement of ΔΓ_s^CP/Γ_s

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

3-6-2009

Comments

Published in PHYSICAL REVIEW LETTERS 102, 091801 (2009). Copyright © 2009 The American Physical Society. Used by permission.

Abstract

We search for the semi-inclusive process B_s⁰ → D_s^(*)D_s^(*) using 2.8 fb^-1 of pp collisions at √s = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider.We observe 26.6 ± 8.4 signal events with a significance above background of 3.2 standard deviations yielding a branching ratio of B(b_s⁰ → D_s^(*)D_s^(*) = 0.035 ± 0.010(stat.) ± 0.011 (syst.). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the B_s⁰ decays resulting in a width difference of ΔΓ_s^CP/Γ_s = 0.072 ± 0.021 (stat.) ± 0.022(syst.)