2 research outputs found
Measurement of the CP-violating phase in decays and limits on penguin effects
Time-dependent CP violation is measured in the channel for each resonant final state using data
collected with an integrated luminosity of 3.0 fb in collisions
using the LHCb detector. The final state with the largest rate,
, is used to measure the CP-violating angle to be . This result can be used to
limit the size of penguin amplitude contributions to CP violation measurements
in, for example, decays. Assuming approximate
SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the
CP-violating phase is limited to be within the interval
[, +] at 95% confidence level. Changes to the limit
due to SU(3) symmetry breaking effects are also discussed.Comment: 18 pages, 6 figures; v2-updated from reviewers comments and added a
figur
Study of the rare B-s(0) and B-0 decays into the pi(+) pi(-) mu(+) mu(-) final state
A search for the rare decays and is performed in a data set corresponding to an integrated
luminosity of 3.0 fb collected by the LHCb detector in proton-proton
collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with
pion pairs that have invariant mass in the range 0.5-1.3 GeV/ and with
muon pairs that do not originate from a resonance are considered. The first
observation of the decay and the first
evidence of the decay are obtained and the
branching fractions, restricted to the dipion-mass range considered, are
measured to be and
, where the third
uncertainty is due to the branching fraction of the decay , used as a normalisation.Comment: 21 pages, 3 figures, 2 Table