Possible indications of new physics in B d -mixing and in sin (2 β) determinations

By E. Lunghi, A. Soni. 2008

164 citations recorded by the source corpus.

Abstract Using the hadronic matrix elements from the lattice, B K and ξ s , involving only the 4-quark operators for Δ flavor = 2 Hamiltonian relevant for K – K ¯ , B d – B ¯ d and B s – B ¯ s mixing, along with V c b , we deduce a non-trivial constraint on the SM, sin ( 2 β ) = 0.87 ± 0.09 . This deviates from direct experimental measurements via the tree process, b → c c ¯ s as well as the one via the penguin-loop b → s decays by around 2.1 and 2.7σ respectively. If these deviations are confirmed they would imply the presence of new physics rather pervasively in both B d – B ¯ d (i.e. very likely in b → d ) as well as in b → s transitions requiring a beyond the SM CP-odd phase. Consequently, improvements in the relevant lattice calculations should be given a high priority.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/eaece9a0b65f6043e8e52528fb77271392196adf

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Citations in the corpus

Rare K and B Decays in a warped extra dimension with custodial protection (2008, background): “Similar tensions between CP-violation in K 0 − K̄ and B d − B̄ d mixings from a different point of view have been pointed out in [65].”
Anatomy and phenomenology of FCNC and CPV effects in SUSY theories (2009, unknown): “7.1 Comparison with the LHT and RS Models . . . . . . . . . . . . . . . . . . . . 63 7.2 DNA-Flavour Test of New Physics Models . . . . . . . . . . . . . . . . . . . . 64”
Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour violation (2010, background): “of accommodating a large CPV phase in Bs mixing: also the observed anomaly in the relation between "K and S KS [ 22 , 23] is substantially softened in a strictly correlated manner.”
ΔF = 2 observables and fine-tuning in a warped extra dimension with custodial protection (2008, background): “The contributions of KK gauge boson tree level exchanges involving new flavour and CP-violating interactions allow not only to satisfy all existing ∆F = 2 constraints but also to remove a number of tensions experienced lately by the SM, observed in particular in εK , SψKS and Sψφ [60, 74–76].”