Sven Bergmann and Yosef Nir JHEP09(1999)031 doi:10.1088/1126-6708/1999/09/031
New physics effects in doubly Cabibbo suppressed D decays
Sven Bergmann1 and Yosef Nir1
Show affiliationsThe most sensitive experimental searches for D0−
0 mixing use D0→K+π− decays. It is often assumed that effects of New Physics and, in particular, CP violation, can appear through the mixing, while the c→du
decay amplitude cannot have significant contributions from New Physics and is, therefore, CP conserving to a good approximation. We examine this assumption in two ways. First, we calculate the contributions to the decay in various relevant models of New Physics: Supersymmetry without R-parity, multi-scalar models, left-right symmetric models, and models with extra quarks. We find that phenomenological constraints imply that the New Physics contributions are indeed small compared to the standard model doubly Cabibbo suppressed amplitude. Second, we show that many of our constraints hold model-independently. We find, however, one case where the model-independent bound is rather weak and a CP violating contribution of order 30% is not excluded.
- Keywords
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E-print Number: hep-ph/9909391
Cited: by |
Refers: to
- PACS
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13.25.Jx Decays of other mesons
11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries
12.10.Dm Unified theories and models of strong and electroweak interactions
- Subjects
- Dates
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Issue 09 ( 1 September 1999)
Received 27 September 1999, accepted for publication 29 September 1999
Published 6 October 1999
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New physics effects in doubly Cabibbo suppressed D decays
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