Abstract
We make a systematic analysis of the effects of new physics in the B decay amplitudes on the CP asymmetries in neutral B decays. Although these are expected to be smaller than new physics effects on the mixing amplitude, they are easier to probe in some cases. The effects of new contributions to the mixing amplitude are felt universally across all decay modes, whereas the effects of new decay amplitudes could vary from mode to mode. In particular the prediction that the CP asymmetries in the Bd decay modes with b → cc̄s, b → cc̄d, b → cūd and b → ss̄s should all measure the same quantity (sin2β in the Standard Model) could be violated. Since the above Standard Model prediction is very precise, new decay amplitudes which are a few percent of the Standard Model amplitudes can be probed. Three examples of models where measurable effects are allowed are given: effective supersymmetry, models with enhanced chromomagnetic dipole operators, and supersymmetry without R parity.
| Original language | English |
|---|---|
| Pages (from-to) | 241-249 |
| Number of pages | 9 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 395 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - 13 Mar 1997 |
| Externally published | Yes |
Bibliographical note
Funding Information:CP violation has so far only been observed in the decays of neutral K mesons. It is one of the goals of the proposed B factories to find and study CP violation in the decays of B mesons, and thus elucidate the mechanisms by which CP violation manifests itself in the low energy world. There is a commonly accepted Standard Model of CP violation, namely that it is a result of the one physical phase in the 3 x 3 Cab-bibo Kobayashi Maskawa (CKM) matrix [ 11. This scenario has specific predictions for the magnitude as well as patterns of CP violation that will be observed in the B meson decays [ 21. However, since there cur- * Research supported by the Department of Energy under contract DE-AC03-76SPO0515.
Funding
CP violation has so far only been observed in the decays of neutral K mesons. It is one of the goals of the proposed B factories to find and study CP violation in the decays of B mesons, and thus elucidate the mechanisms by which CP violation manifests itself in the low energy world. There is a commonly accepted Standard Model of CP violation, namely that it is a result of the one physical phase in the 3 x 3 Cab-bibo Kobayashi Maskawa (CKM) matrix [ 11. This scenario has specific predictions for the magnitude as well as patterns of CP violation that will be observed in the B meson decays [ 21. However, since there cur- * Research supported by the Department of Energy under contract DE-AC03-76SPO0515.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DE-AC03-76SPO0515 |