Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-24
Phys.Rev. D64 (2001) 074008
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 5 figures, additional reference and several remarks added, results unchanged
Scientific paper
10.1103/PhysRevD.64.074008
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.
Fajfer Svjetlana
Singer Paul
Zupan Jure
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