Large tan beta SUSY QCD corrections to B -> X_s gamma
| dc.creator | Yamada, Youichi | |
| dc.date | 2003-12-17 | |
| dc.date.accessioned | 2026-07-07T03:51:36Z | |
| dc.date.available | 2026-07-07T03:51:36Z | |
| dc.description | The charged-Higgs boson contributions to the Wilson coefficients C_7 and C_8, relevant for the decay B -> X_s gamma, are discussed in supersymmetric models at large tan beta. These contributions receive two-loop O(alpha_s tan beta) corrections by squark-gluino subloops, which are possibly large and nondecoupling in the limit of heavy superpartners. In previous studies, the relevant two-loop Feynman integrals were approximated by using an effective two-Higgs-doublet lagrangian. However, this approximation is theoretically justified only when the typical supersymmetric scale M_SUSY is sufficiently larger than the electroweak scale m_weak \sim (m_W,m_t) and the mass of the charged-Higgs boson m_{H^\pm}. Here we evaluate these two-loop integrals exactly and compare the results with the existing, approximated ones. We then examine the validity of this approximation beyond the region where it has been derived, i.e. for m_H \gtap M_SUSY and/or M_SUSY \sim m_weak. | |
| dc.description | 9 pages, talk at the 2nd International Conference on Flavor Physics (ICFP2003), KIAS, Seoul, Korea, Oct. 6-11, 2003 | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0312228 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0312228 | |
| dc.identifier | J.Korean Phys.Soc. 45 (2004) S483 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/43157 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Large tan beta SUSY QCD corrections to B -> X_s gamma | |
| dc.type | text |