Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 81, 5742 (1998). Copyright © 1998 American Physical Society. Permission to use.


We have searched for the decays Bs0→ e±μ± and Bd0 → e±μ± using a 102 pb-1 data sample of pp̅ collisions at √s =1.8 TeV collected with the Collider Detector at Fermilab. We set upper limits on the branching fractions of Ɓ(Bs0 → e±μ±) < 6.1(8.2) X 10-6 and Ɓ(Bd0 → e±μ±) < 3.5(4.5) X 10-6 at 90(95)% confidence level. Using these limits, we set lower bounds on the corresponding Pati-Salam leptoquark masses and find that MLQ(Bs0) > 20.7(19.3) TeV/c2 and MLQ(Bd0 > 21.7(20.4) TeV/c2 at 90(95)% confidence level.

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