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• W1750854767 abstract "We present a calculation of the rare decay mode D^0 -> gamma gamma, in which the long distance contributions are expected to be dominant. Using the Heavy Quark Chiral Perturbation Theory Lagrangian with a strong g coupling as recently determined by CLEO from the D^* -> D pi width, we consider both the anomaly contribution which relates to the annihilation part of the weak Lagrangian and the one-loop pi, K diagrams. The loop contributions which are proportional to g and contain the a_1 Wilson coefficient are found to dominate the decay amplitude, which turns out to be mainly parity violating. The branching ratio is then calculated to be (1.0+-0.5)x10^(-8). Observation of an order of magnitude larger branching ratio could be indicative of new physics." @default.
• W1750854767 created "2016-06-24" @default.
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• W1750854767 date "2001-09-04" @default.
• W1750854767 modified "2023-10-16" @default.
• W1750854767 title "Rare decayD0→γγ" @default.
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• W1750854767 doi "https://doi.org/10.1103/physrevd.64.074008" @default.
• W1750854767 hasPublicationYear "2001" @default.
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