Reevaluating uncertainties in B ¯ $$ \overline{B} $$ → X s γ decay
Abstract The rare decay B ¯ $$ \overline{B} $$ → X s γ is an important probe of physics beyond the standard model. The largest uncertainty on the total rate and the CP asymmetry arises from resolved photon contributions. These appear first at order 1/m b and are related to operators other than Q 7γ...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-11-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP11(2019)141 |
| Summary: | Abstract The rare decay B ¯ $$ \overline{B} $$ → X s γ is an important probe of physics beyond the standard model. The largest uncertainty on the total rate and the CP asymmetry arises from resolved photon contributions. These appear first at order 1/m b and are related to operators other than Q 7γ in the effective weak Hamiltonian. One of the three leading contributions, Q 1 q − Q 7 γ $$ {Q}_1^q-{Q}_{7\gamma } $$ , is described by a non-local function whose moments are related to HQET parameters. We use recent progress in our knowledge of these parameters to reevaluate the resolved photon contribution to B ¯ $$ \overline{B} $$ → X s γ total rate and CP asymmetry. |
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| ISSN: | 1029-8479 |