Search for leptonic decays of D0 mesons
M. Petri\v{c}, M. Stari\v{c} (for the Belle Collaboration)
TL;DR
This study searches for rare leptonic and lepton-flavor violating decays of D0 mesons, setting new upper limits on their branching fractions with no evidence of such decays found.
Contribution
It provides the most stringent upper limits to date on the branching fractions of these rare D0 meson decays.
Findings
No evidence for the decays was observed.
Significantly improved upper limits on branching fractions were established.
Results constrain new physics models predicting such decays.
Abstract
We search for the flavor-changing neutral current decays D0\to mu+mu- and D0\to e+e-, and for the lepton-flavor violating decays D0\to e\pm mu\mp using 660 fb^-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find no evidence for any of these decays. We obtain significantly improved upper limits on the branching fractions: B(D0\to mu+mu-)<1.4x10-7, B(D0\to e+e-)<7.9x10-8, and B(D0\to e+mu-)+B(D0\to mu+e-)<2.6x10-7 at 90% confidence level.
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