Electroweak effects in radiative B decays
We compute the two-loop electroweak corrections to the radiative decays of the B meson in the SM. Electroweak effects reduce the Wilson coefficient C7eff (Mw) by 2.6% for a light Higgs boson of about 100 GeV and are less important for a heavier Higgs. The leading term of a heavy top expansion of our...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2000
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| _version_ | 1826262468694900736 |
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| author | Gambino, P Haisch, U |
| author_facet | Gambino, P Haisch, U |
| author_sort | Gambino, P |
| collection | OXFORD |
| description | We compute the two-loop electroweak corrections to the radiative decays of the B meson in the SM. Electroweak effects reduce the Wilson coefficient C7eff (Mw) by 2.6% for a light Higgs boson of about 100 GeV and are less important for a heavier Higgs. The leading term of a heavy top expansion of our result differs from the one obtained in the gaugeless approximation where only top quark Yukawa couplings are considered: we discuss the origin of the discrepancy and provide a criterion for the validity of the gaugeless approximation. As a byproduct of the calculation we also obtain the O(α) corrections to the Wilson coefficient of the four-fermion operator Q2. A careful analysis of the interplay between electroweak and QCD effects leads to an overall 2% reduction of the total branching ratio for B → Xsγ due to purely electroweak corrections. For a light Higgs boson, the up-to-date SM prediction is BRγ = (3.29 ± 0.21) × 10-4. |
| first_indexed | 2024-03-06T19:36:39Z |
| format | Journal article |
| id | oxford-uuid:1f480228-62d9-4023-961b-d9556de1bb86 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:36:39Z |
| publishDate | 2000 |
| record_format | dspace |
| spelling | oxford-uuid:1f480228-62d9-4023-961b-d9556de1bb862022-03-26T11:20:57ZElectroweak effects in radiative B decaysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1f480228-62d9-4023-961b-d9556de1bb86EnglishSymplectic Elements at Oxford2000Gambino, PHaisch, UWe compute the two-loop electroweak corrections to the radiative decays of the B meson in the SM. Electroweak effects reduce the Wilson coefficient C7eff (Mw) by 2.6% for a light Higgs boson of about 100 GeV and are less important for a heavier Higgs. The leading term of a heavy top expansion of our result differs from the one obtained in the gaugeless approximation where only top quark Yukawa couplings are considered: we discuss the origin of the discrepancy and provide a criterion for the validity of the gaugeless approximation. As a byproduct of the calculation we also obtain the O(α) corrections to the Wilson coefficient of the four-fermion operator Q2. A careful analysis of the interplay between electroweak and QCD effects leads to an overall 2% reduction of the total branching ratio for B → Xsγ due to purely electroweak corrections. For a light Higgs boson, the up-to-date SM prediction is BRγ = (3.29 ± 0.21) × 10-4. |
| spellingShingle | Gambino, P Haisch, U Electroweak effects in radiative B decays |
| title | Electroweak effects in radiative B decays |
| title_full | Electroweak effects in radiative B decays |
| title_fullStr | Electroweak effects in radiative B decays |
| title_full_unstemmed | Electroweak effects in radiative B decays |
| title_short | Electroweak effects in radiative B decays |
| title_sort | electroweak effects in radiative b decays |
| work_keys_str_mv | AT gambinop electroweakeffectsinradiativebdecays AT haischu electroweakeffectsinradiativebdecays |