Upper bounds on supersymmetric contributions to b-->s transitions from Bs-Bs mixing.
We study the constraints on supersymmetric contributions to b-->s transitions from the recent allowed range and measurement of B(s)-B(s) mixing obtained by the D0 and Collider Detector at Fermilab collaborations at the Tevatron. We compute the upper bounds on the relevant off-diagonal squark mass terms and compare them with the bounds coming from delta F= 1 decays. We find that the constraints on chirality-flipping mass insertions are unaffected. Conversely, the measurement of B(s)-B(s) mixing is effective in constraining chirality-conserving mass insertions, and it has striking effects in the case in which left- and right-handed insertions have similar size. Finally, we discuss the phase of the B(s)-B(s) mixing amplitude in the presence of supersymmetric contributions.
Ciuchini
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Dipartimento di Fisica, Università di Roma Tre and INFN, Sezione di Roma III, Via della Vasca Navale 84, I-00146 Roma, Italy.
Silvestrini
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