B0(s) - anti-B0(s) mixing and the B(s) ---> J / psi phi asymmetry in supersymmetric models
(2004) Physical Review D, Particles, Fields, Gravitation and Cosmology — Vol. 69, p. 115011 (2004)
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- (en) 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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Ball, P., Khalil, S., & Kou, E. (2004). B0(s) - anti-B0(s) mixing and the B(s) ---> J / psi phi asymmetry in supersymmetric models. Physical Review D, Particles, Fields, Gravitation and Cosmology, 69, 115011. https://doi.org/10.1103/PhysRevD.69.115011 (Original work published 2004)