B̄→Xsγ in two universal extra dimensions
We calculate the leading order corrections to the B̄→Xsγ 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 cutoff scale...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2008
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| _version_ | 1797052308272447488 |
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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 B̄→Xsγ 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 cutoff scale Λ. 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 B̄→Xsγ, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cutoff and higher-order effects, we find 1/R>650GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R 600GeV preferred by dark matter constraints. © 2008 The American Physical Society. |
| first_indexed | 2024-03-06T18:30:22Z |
| format | Journal article |
| id | oxford-uuid:096dadaf-4243-4b88-a9cc-fdcd47b5aa49 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:30:22Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:096dadaf-4243-4b88-a9cc-fdcd47b5aa492022-03-26T09:18:22ZB̄→Xsγ in two universal extra dimensionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:096dadaf-4243-4b88-a9cc-fdcd47b5aa49EnglishSymplectic Elements at Oxford2008Freitas, AHaisch, UWe calculate the leading order corrections to the B̄→Xsγ 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 cutoff scale Λ. 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 B̄→Xsγ, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cutoff and higher-order effects, we find 1/R>650GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R 600GeV preferred by dark matter constraints. © 2008 The American Physical Society. |
| spellingShingle | Freitas, A Haisch, U B̄→Xsγ in two universal extra dimensions |
| title | B̄→Xsγ in two universal extra dimensions |
| title_full | B̄→Xsγ in two universal extra dimensions |
| title_fullStr | B̄→Xsγ in two universal extra dimensions |
| title_full_unstemmed | B̄→Xsγ in two universal extra dimensions |
| title_short | B̄→Xsγ in two universal extra dimensions |
| title_sort | b xsγ in two universal extra dimensions |
| work_keys_str_mv | AT freitasa bxsgintwouniversalextradimensions AT haischu bxsgintwouniversalextradimensions |