Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-08-10
Phys.Rev.Lett.92:161801,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
Revtex4, 4 pages, 6 figures, title changed, version accepted by PRL
Scientific paper
10.1103/PhysRevLett.92.161801
We examine the process $B \to X_s \gamma$ in minimal supersymmetry (SUSY) with general squark flavor mixings. We include all relevant next--to--leading order (NLO) QCD corrections and dominant NLO SUSY effects from the gluino. We find that gluino--squark corrections to down--type quark masses induce large NLO corrections to the dominant Wilson coefficients whose size is often similar to those at LO, especially at large $\tan\beta$. For $\mu>0$, destructive interference, and suppression by the renormalization group running lead to a ``focusing effect'' of reducing the size of gluino corrections to the branching ratio, and also of reducing the LO sensitivity to flavor mixings among squarks. Constraints from $B(B \to X_s \gamma)$ on the SUSY--breaking scale can become significantly weakened relative to the minimal flavor violation case, even, at large $\tan\beta$, for small flavor mixings. The case of $\mu<0$ can also becomes allowed.
Okumura Ken'ichi
Roszkowski Leszek
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