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Abstract: (arXiv)
We study the flavor-changing-neutral-current process c to u mu+ mu- using 1.3 fb^-1 of p p bar collisions at sqrt(s) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We see clear indications of the Ds+ and D+ to phi pi+ to mu+ mu- pi+ final states with significance greater than four standard deviations above background for the D+ state. We search for the continuum decay of D+ to pi+mu+mu- in the dimuon invariant mass spectrum away from the phi resonance. We see no evidence of signal above background and set a limit of B(D+ to pi+mu+mu-) < 3.9 x 10^-6 at the 90% C.L. This limit places the most stringent constraint on new phenomena in the c to u mu+ mu- transition.Note:
- Submitted to Phys. Rev. Lett
- 11.30.Hv
- 11.30.Fs
- 13.20.Fc
- 12.15.Mm
- anti-p p: colliding beams
- anti-p p: inclusive reaction
- charmed meson: hadroproduction
- charmed meson: semileptonic decay
- mass spectrum: (pi+ muon+ muon-)
- Phi(1020): intermediate state
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