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, Massimo
Membro 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.
Articolo in rivista - Articolo scientifico
BABAR detector
English
Carpinelli Massimo (The BABAR Collaboration)
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].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389265
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