Anti-B --> X(s) gamma in two universal extra dimensions
We calculate the leading order corrections to the anti-B --> X(s) gamma decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a^+-_(kl) depend logarithmically on the...
| Auteurs principaux: | , |
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| Format: | Journal article |
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2008
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| _version_ | 1826302350685372416 |
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| author | Freitas, A Haisch, U |
| author_facet | Freitas, A Haisch, U |
| author_sort | Freitas, A |
| collection | OXFORD |
| description | We calculate the leading order corrections to the anti-B --> X(s) gamma decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a^+-_(kl) depend logarithmically on the ultraviolet cut-off scale Lambda. We emphasize that all flavor-changing neutral current transitions suffer from this problem. Although the ultraviolet sensitivity weakens the lower bound on the inverse compactification radius 1/R that follows from anti-B --> X(s) gamma, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cut-off and higher-order effects, we find 1/R > 650 GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R <~ 600 GeV preferred by dark matter constraints. |
| first_indexed | 2024-03-07T05:46:14Z |
| format | Journal article |
| id | oxford-uuid:e7520045-60a8-4cd1-826c-be476bf3965b |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:46:14Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:e7520045-60a8-4cd1-826c-be476bf3965b2022-03-27T10:37:45ZAnti-B --> X(s) gamma in two universal extra dimensionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e7520045-60a8-4cd1-826c-be476bf3965bSymplectic Elements at Oxford2008Freitas, AHaisch, UWe calculate the leading order corrections to the anti-B --> X(s) gamma decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a^+-_(kl) depend logarithmically on the ultraviolet cut-off scale Lambda. We emphasize that all flavor-changing neutral current transitions suffer from this problem. Although the ultraviolet sensitivity weakens the lower bound on the inverse compactification radius 1/R that follows from anti-B --> X(s) gamma, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cut-off and higher-order effects, we find 1/R > 650 GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R <~ 600 GeV preferred by dark matter constraints. |
| spellingShingle | Freitas, A Haisch, U Anti-B --> X(s) gamma in two universal extra dimensions |
| title | Anti-B --> X(s) gamma in two universal extra dimensions |
| title_full | Anti-B --> X(s) gamma in two universal extra dimensions |
| title_fullStr | Anti-B --> X(s) gamma in two universal extra dimensions |
| title_full_unstemmed | Anti-B --> X(s) gamma in two universal extra dimensions |
| title_short | Anti-B --> X(s) gamma in two universal extra dimensions |
| title_sort | anti b gt x s gamma in two universal extra dimensions |
| work_keys_str_mv | AT freitasa antibgtxsgammaintwouniversalextradimensions AT haischu antibgtxsgammaintwouniversalextradimensions |