3 research outputs found

    Measurement of the lifetime of the Bc+B_c^+ meson using the Bc+→J/ψπ+B_c^+\rightarrow J/\psi\pi^+ decay mode

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    The difference in total widths between the Bc+B_c^+ and B+B^+ mesons is measured using 3.0fb−1^{-1} of data collected by the LHCb experiment in 7 and 8 TeV centre-of-mass energy proton-proton collisions at the LHC. Through the study of the time evolution of Bc+→J/ψπ+B_c^+ \rightarrow J/\psi \pi^+ and B+→J/ψK+B^+\rightarrow J/\psi K^+ decays, the width difference is measured to be ΔΓ≡ΓBc+−ΓB+=4.46±0.14±0.07mm−1c, \Delta\Gamma \equiv \Gamma_{B_c^+} - \Gamma_{B^+} = 4.46 \pm 0.14 \pm 0.07mm^{-1}c, where the first uncertainty is statistical and the second systematic. The known lifetime of the B+B^+ meson is used to convert this to a precise measurement of the Bc+B_c^+ lifetime, τBc+=513.4±11.0±5.7fs,\tau_{B_c^+} = 513.4 \pm 11.0 \pm 5.7fs, where the first uncertainty is statistical and the second systematic.Comment: 19 pagers, 3 figure

    Measurement of the CP-violating phase ÎČ\beta in B0→J/ψπ+π−B^0\rightarrow J/\psi \pi^+\pi^- decays and limits on penguin effects

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    Time-dependent CP violation is measured in the B0→J/ψπ+π−B^0\rightarrow J/\psi\pi^+\pi^- channel for each π+π−\pi^+\pi^- resonant final state using data collected with an integrated luminosity of 3.0 fb−1^{-1} in pppp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770)J/\psi\rho^0(770), is used to measure the CP-violating angle 2ÎČeff2\beta^{\rm eff} to be (41.7±9.6−6.3+2.8)∘(41.7\pm 9.6_{-6.3}^{+2.8})^{\circ}. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, Bs0→J/ψϕB_s^0\rightarrow J/\psi\phi decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs\phi_s is limited to be within the interval [−1.05∘-1.05^\circ, +1.18∘1.18^\circ] 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

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    A search for the rare decays Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1^{-1} 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/c2c^2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and the first evidence of the decay B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−Ό+Ό−)=(8.6±1.5 (stat)±0.7 (syst)±0.7 (norm))×10−8\mathcal{B}(B_s^0 \to \pi^+\pi^-\mu^+\mu^-)=(8.6\pm 1.5\,({\rm stat}) \pm 0.7\,({\rm syst})\pm 0.7\,({\rm norm}))\times 10^{-8} and B(B0→π+π−Ό+Ό−)=(2.11±0.51 (stat)±0.15 (syst)±0.16 (norm))×10−8\mathcal{B}(B^0 \to \pi^+\pi^-\mu^+\mu^-)=(2.11\pm 0.51\,({\rm stat}) \pm 0.15\,({\rm syst})\pm 0.16\,({\rm norm}) )\times 10^{-8}, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→Ό+Ό−)K∗(890)0(→K+π−)B^0\to J/\psi(\to \mu^+\mu^-)K^*(890)^0(\to K^+\pi^-), used as a normalisation.Comment: 21 pages, 3 figures, 2 Table
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