Abstract
The mixing-induced CP-violating phase ϕs in Bs0 and B¯s0 decays is measured using the J/ψπ+π− final state in data, taken from 3 fb−1 of integrated luminosity, collected with the LHCb detector in 7 and 8 TeV centre-of-mass pp collisions at the LHC. A time-dependent flavour-tagged amplitude analysis, allowing for direct CP violation, yields a value for the phase ϕs=70±68±8 mrad. This result is consistent with the Standard Model expectation and previous measurements.
Highlights
One of the most sensitive ways of detecting the presence of heretofore unseen particles or forces is through the observation of effects they may have on CP-violating decays of neutral B mesons [1]
The decay time distribution is influenced by acceptance effects that are introduced by track reconstruction, trigger and event selection
The CP phase φs is determined from the fit that uses the amplitude model with five final state π +π − resonances
Summary
One of the most sensitive ways of detecting the presence of heretofore unseen particles or forces is through the observation of effects they may have on CP-violating decays of neutral B mesons [1]. The complex parameters q and p are used to relate the mixing between the mass and flavour eigenstates. CP violation in the interference between mixing and decay associated with the state i, the amplitudes A and A can be further expressed as the sums of the individual. For J /ψ decays to μ+μ− final states, these amplitudes are themselves functions of four variables: the π +π − invariant mass mhh = m(π +π −), and the three angles Ω , defined in the helicity basis. These consist of the angle between the μ+ direction in the.
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