Search for Flavor-Changing-Neutral-Current D Meson Decays

Authors

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

Date of this Version

March 2008

Comments

Published by American Physical Society. Phys. Rev. Lett. 100, 101801 (2008). http://prl.aps.org. Copyright © 2008 American Physical Society. Permission to use.

Abstract

We study the flavor-changing-neutral-current process c → uμ⁺μ^- using 1.3 fb^-1 of pp collisions at √s = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We see clear indications of the charged-current mediated D⁺_s and D⁺ → φπ⁺ → μ⁺μ^-π⁺ final states with significance greater than 4 standard deviations above background for the D⁺ state. We search for the continuum neutral-current decay of D⁺ → μ⁺μ^-π⁺ in the dimuon invariant mass spectrum away from the φ resonance. We see no evidence of signal above background and set a limit of B(D⁺ → π⁺μ⁺μ^-) < 3.9 x 10^-6 at the 90% C.L. This limit places the most stringent constraint on new phenomena in the c → uμ⁺μ^- transition.