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 470.5  fb−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.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., et al. (2012). Search for the decay D-0 -> gamma gamma and measurement of the branching fraction for D-0 -> pi(0)pi(0). PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(9), 1-8 [10.1103/PhysRevD.85.091107].

Search for the decay D-0 -> gamma gamma and measurement of the branching fraction for D-0 -> pi(0)pi(0)

PATRIGNANI, CLAUDIA;
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 470.5  fb−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.
2012
Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., et al. (2012). Search for the decay D-0 -> gamma gamma and measurement of the branching fraction for D-0 -> pi(0)pi(0). PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(9), 1-8 [10.1103/PhysRevD.85.091107].
Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537521
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