Research Papers in Physics and Astronomy


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Published in PHYSICAL REVIEW LETTERS 101, 241801 (2008). Copyright © 2008 The American Physical Society. Used by permission.


From an analysis of the flavor-tagged decay Bs0J/ ψφ we obtain the width difference between the Bs0 light and heavy mass eigenstates, ΔΓs = 0.19 ± 0.07 (stat)-0.01+0.02 (syst) ps-1, and the CP-violating phase, φs = -0.57-0.30+0.24(stat)-0.02+0.08(syst). The allowed 90% CL intervals of ΔΓs and φs are 0.06 < ΔΓs < 0.30 ps-1 and -1.20< φs < 0.06, respectively. The data sample corresponds to an integrated luminosity of 2.8 fb-1 accumulated with the D0 detector at the Fermilab Tevatron collider.

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