title: Upper bounds on supersymmetric contributions to b-->s transitions from Bs-Bs mixing.
abstract: 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.
authors.affiliation: Dipartimento di Fisica, Università di Roma Tre and INFN, Sezione di Roma III, Via della Vasca Navale 84, I-00146 Roma, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ciuchini
authors.forename: L
authors.initials: L
authors.lastname: Silvestrini