General lower bounds for b{yields}d penguin processes
- Theory Division, Department of Physics, CERN, CH-1211 Geneva 23 (Switzerland)
- Physik Department, Technische Universitaet Muenchen, D-85748 Garching (Germany)
For the exploration of flavor physics, b{yields}d penguin processes are an important aspect, with the prominent example of B{sub d}{sup 0}{yields}K{sup 0}K{sup 0}. We recently derived lower bounds for the CP-averaged branching ratio of this channel in the standard model; they were found to be very close to the corresponding experimental upper limits, thereby suggesting that B{sub d}{sup 0}{yields}K{sup 0}K{sup 0} should soon be observed. In fact, the BABAR Collaboration subsequently announced the first signals of this transition. Here we point out that it is also possible to derive lower bounds for B{yields}{rho}{gamma} decays, which are again surprisingly close to the current experimental upper limits. We show that these bounds are realizations of a general bound that holds within the standard model for b{yields}d penguin processes, allowing further applications to decays of the kind B{sup {+-}}{yields}K{sup (}*{sup ){+-}}K{sup (}*{sup )} and B{sup {+-}}{yields}{pi}{sup {+-}}l{sup +}l{sup -}, {rho}{sup {+-}}l{sup +}l{sup -}.
- OSTI ID:
- 20706078
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 5; Other Information: DOI: 10.1103/PhysRevD.71.051501; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
B MINUS MESONS
B NEUTRAL MESONS
B PLUS MESONS
B QUARKS
BRANCHING RATIO
CP INVARIANCE
D QUARKS
HADRONIC PARTICLE DECAY
KAONS NEUTRAL
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
PHOTONS
RHO-770 MESONS
SEMILEPTONIC DECAY
STANDARD MODEL