Ball, P.
Khalil, S.
Kou, E.
[UCL]
(eng)
We analyse supersymmetric contributions to B_s mixing and their impact on
mixing-induced CP asymmetries, using the mass insertion approximation. We
discuss in particular the correlation of SUSY effects in the CP asymmetries of
B_s -> J/psi phi and B_d -> phi K_S and find that the mass insertions dominant
in B_s mixing and B_d -> phi K_S are (delta_{23}^d)_{LL, RR} and
(delta_{23}^d)_{LR, RL}, respectively. We show that models with dominant
(delta_{23}^d)_{LR, RL} can accomodate a negative value of S_{phi K_S}, in
agreement with the BELLE measurement of that observable, but yield a B_s mixing
phase too small to be observed. On the other hand, models with dominant
(delta_{23}^d)_{LL, RR} predict sizeable SUSY contributions to both Delta M_s
and the mixing phase, but do not allow the asymmetry in B_d -> phi K_S to
become negative, except for small values of the average down squark mass,
which, in turn, entail a value of Delta M_s too large to be observed at the
Tevatron and the LHC. We conclude that the observation of B_s mixing at hadron
machines, together with the confirmation of a negative value of S_{phi K_S},
disfavours models with a single dominant mass insertion.
Comment: 17 pages, 5 figures
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Bibliographic reference |
Ball, P. ; Khalil, S. ; Kou, E.. B0(s) - anti-B0(s) mixing and the B(s) ---> J / psi phi asymmetry in supersymmetric models. In: Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol. 69, p. 115011 (2004) |
Permanent URL |
http://hdl.handle.net/2078/31286 |