Eur. Phys. J. C (2011) 71: 1812
https://doi.org/10.1140/epjc/s10052-011-1812-1

Regular Article - Theoretical Physics

B-decay CP-asymmetries in SUSY with a U(2)³ flavour symmetry

¹ Scuola Normale Superiore and INFN, Piazza dei Cavalieri 7, 56126, Pisa, Italy
² INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044, Frascati, Italy

^* e-mail: gino.isidori@lnf.infn.it

Received: 16 September 2011
Revised: 4 November 2011
Published online: 3 December 2011

Abstract

We study CP asymmetries in rare B decays within supersymmetry with a U(2)³ flavour symmetry, motivated by the SUSY flavour and CP problems, the hierarchies in the Yukawa couplings and the absence so far of any direct evidence for SUSY. Even in the absence of flavour-blind phases, we find potentially sizable CP violating contributions to b→s decay amplitudes. The effects in the mixing-induced CP asymmetries in B→ϕK _S and B→η′K _S , angular CP asymmetries in B→K ^∗ μ ⁺ μ ⁻ and the direct CP asymmetry in B→X _s γ can be in the region to be probed by LHCb and next generation B factories. At the same time, these effects in B decays are compatible with CP violating contributions to meson mixing, including a non-standard B _s mixing phase hinted by current tensions in the CKM fit mostly between and .