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B_s -> mu^+ mu^- and B -> X_s mu^+ mu^- in MSSM | | Chao-Shang Huang
; Xiao-Hong Wu
; | | Date: |
16 Dec 2002 | | Journal: | Nucl.Phys. B657 (2003) 304-332 | | Subject: | hep-ph | | Affiliation: | ITP, Beijing), Xiao-Hong Wu (CCAST & ITP, Beijing | | Abstract: | Pure leptonic and semileptonic rare B decays, $B_s o mu^+ mu^-$ and $B o X_s mu^+ mu^-$ in the minimal supersymmetric Standard Model (MSSM), in particular, gluino and neutralino contributions to the decays, are discussed under Br($B o X_s gamma$) and other experimental constraints . The general scalar quark mass matrices as the new sources of flavor violation are considered. We present Wilson coefficients of $bs$ transitions from $gamma$, $Z$, and neutral Higgs boson penguin diagrams by using vertex mixing method to deal with scalar down-type quark flavor changing and also give their expressions in MIA to show different sources of enhancements. We find that under the experimental constraints, with large mixing of left-handed and right-handed sbottom, $C^{(prime)}_{10}$ can be enhanced by 10% compared with SM, in two cases, heavy gluino and fine-tuning between $delta^{dLL}_{23}$($delta^{dRR}_{23}$) and $delta^{dLR}_{23}$($delta^{dRL}_{23}$) terms in $C^{(prime)}_7$. Particularly, $C_{10}$ and $C_{10}^{prime}$ can reach a 20% enhancement in some regions of parameters under experimental constraints. When CP-odd Higgs $A^0$ is not too heavy ($sim 250$GeV), and $ aneta$ is large ($sim 40$), neutral Higgs boson penguins with gluino and down-type squark in the loop can significantly contribute to the $bs$ transition and the contributions can compete with those due to the chargino and up-type squark loop. | | Source: | arXiv, hep-ph/0212220 | | Services: | Forum | Review | PDF | Favorites | |
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