We search for the rare decay of the D0 meson to two photons, D0→γγ, and present a measurement of the branching fraction for a D0 meson decaying to two neutral pions, B(D0→π0π0). The data sample analyzed corresponds to an integrated luminosity of 470.5fb -1 collected by the BABAR detector at the PEP-II asymmetric-energy e +e - collider at SLAC. We place an upper limit on the branching fraction, B(D0→γγ)<2.2×10 -6, at 90% confidence level. This limit improves on the existing limit by an order of magnitude. We also find B(D0→π0π0)=(8.4±0.1±0. 4±0.3)×10 -4.
Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., et al. (2012). Search for the decay D0→γγ and measurement of the branching fraction for D0→π0π0. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(9) [10.1103/PhysRevD.85.091107].
Search for the decay D0→γγ and measurement of the branching fraction for D0→π0π0
Martinelli M.;CARPINELLI, MassimoMembro del Collaboration Group
;
2012
Abstract
We search for the rare decay of the D0 meson to two photons, D0→γγ, and present a measurement of the branching fraction for a D0 meson decaying to two neutral pions, B(D0→π0π0). The data sample analyzed corresponds to an integrated luminosity of 470.5fb -1 collected by the BABAR detector at the PEP-II asymmetric-energy e +e - collider at SLAC. We place an upper limit on the branching fraction, B(D0→γγ)<2.2×10 -6, at 90% confidence level. This limit improves on the existing limit by an order of magnitude. We also find B(D0→π0π0)=(8.4±0.1±0. 4±0.3)×10 -4.
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