New physics in $$B_{d,s}$$ B d , s – $${\bar{B}}_{d,s}$$ B ¯ d , s mixings and $$B_{d,s}\rightarrow \mu ^+\mu ^-$$ B d , s → μ + μ - decays

Search for D+(s)→π+μ+μ− and D+(s)→π−μ+μ+ decays

Article history: Received 24 April 2013 Received in revised form 3 June 2013 Accepted 4 June 2013 Available online 7 June 2013 Editor: L. Rolandi A search for non-resonant D(s) → π+μ+μ− and D(s) → π−μ+μ+ decays is performed using proton– proton collision data, corresponding to an integrated luminosity of 1.0 fb−1, at √ s = 7 TeV recorded by the LHCb experiment in 2011. No signals are observed a...

A signal of new physics from measuring CP violation in B d , s → μ + μ −

We analyze the possibility of observing CP violating effects in B 0 d,s → µ + µ − decays in future B factory. The CP violating obervables are defined by taking into account the mixing of the neutral mesons, B 0 d,s and ¯ B 0 d,s. It is shown that in the approximation of | q p |=1 the CP violation vanishes in SM. In a 2HDM with CP violating phases and MSSM the CP asymmetries depend on the parame...

Shedding Light on the “ Dark Side ” of B 0 d – B 0 d Mixing through B d → π + π − , K → πνν and B d , s → μ + μ −

In a wide class of new-physics models, which can be motivated through generic arguments and within supersymmetry, we obtain large contributions to B0 d–B 0 d mixing, but not to ∆B = 1 processes. If we assume such a scenario, the solutions φd ∼ 47 ∨ 133 for the B0 d–B d mixing phase implied by Amix CP (Bd → J/ψKS) cannot be converted directly into a constraint in the ρ–η plane. However, we may c...

Measurement of the semileptonic charge asymmetry using B 0 s → D s μ X decays

Lepton Polarization in the Decays B → X s μ + μ − and B → X s τ + τ −

The effective Hamiltonian for the decay b → s l + l − predicts a characteristic polarization for the final state lepton, which can serve as an important test of the underlying theory. The lepton polarization has, in addition to a longitudinal component P L , two orthogonal components P T and P N , lying in and perpendicular to the decay plane which are proportional to m l /m b , and therefore s...