Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 94, 071802 (2005). Copyright © 2005 American Physical Society. Used by permission.


We present the results of a search for the flavor-changing neutral current decay Bs0 → μ+μ- using a data set with integrated luminosity of 240 pb-1 of pp̅ collisions at √s = 1.96 TeV collected with the D0 detector in run II of the Fermilab Tevatron collider.We find the upper limit on the branching fraction to be Ɓ(Bs0 → μ+μ-) ≤ 5.0 x 10-7 at the 95% C.L. assuming no contributions from the decay Bd0 → μ+μ- in the signal region. This limit is the most stringent upper bound on the branching fraction Bs0 → μ+μ- to date.

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