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B -> X_s gamma in supersymmetry: large contributions beyond the leading order | | G. Degrassi
; P. Gambino
; G.F. Giudice
; | | Date: |
29 Sep 2000 | | Journal: | JHEP 0012 (2000) 009 | | Subject: | hep-ph | | Abstract: | We discuss possible large contributions to B -> X_s gamma, which can occur at the next-to-leading order in supersymmetric models. They can originate from terms enhanced by tan(beta) factors, when the ratio between the two Higgs vacuum expectation values is large, or by logarithm of M_{susy}/M_W, when the supersymmetric particles are considerably heavier than the W boson. We give compact formulae which include all potentially large higher-order contributions. We find that tan(beta) terms at the next-to-leading order do not only appear from the Hall-Rattazzi-Sarid effect (the modified relation between the bottom mass and Yukawa coupling), but also from an analogous effect in the top-quark Yukawa coupling. Finally, we show how next-to-leading order corrections, in the large tan(beta) region, can significantly reduce the limit on the charged-Higgs mass, even if supersymmetric particles are very heavy. | | Source: | arXiv, hep-ph/0009337 | | Services: | Forum | Review | PDF | Favorites | |
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