179 research outputs found

    Measurement of CP observables in B± → D(⁎)K± and B± → D(⁎)π± decays

    Get PDF
    Measurements of CP observables in B ± →D (⁎) K ± and B ± →D (⁎) π ± decays are presented, where D (⁎) indicates a neutral D or D ⁎ meson that is an admixture of D (⁎)0 and DÂŻ (⁎)0 states. Decays of the D ⁎ meson to the Dπ 0 and DÎł final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the B candidate invariant mass distribution. Decays of the D meson are fully reconstructed in the K ± π ∓ , K + K − and π + π − final states. The analysis uses a sample of charged B mesons produced in pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb −1 taken at centre-of-mass energies of s=7, 8 and 13 TeV, respectively. The study of B ± →D ⁎ K ± and B ± →D ⁎ π ± decays using a partial reconstruction method is the first of its kind, while the measurement of B ± →DK ± and B ± →Dπ ± decays is an update of previous LHCb measurements. The B ± →DK ± results are the most precise to date

    Measurement of CPCP asymmetries in D±→ηâ€Čπ±D^{\pm}\rightarrow \eta^{\prime} \pi^{\pm} and Ds±→ηâ€Čπ±D_s^{\pm}\rightarrow \eta^{\prime} \pi^{\pm} decays

    Get PDF
    See paper for full list of authors - All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-041.html - Submitted to Phys. Lett. BInternational audienceA search for CP violation in D±→ηâ€Čπ± and D±s→ηâ€Čπ± decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 3 fb−1, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured CP-violating charge asymmetries are ACP(D±→ηâ€Čπ±)=(−0.61±0.72±0.55±0.12)% and ACP(D±s→ηâ€Čπ±)=(−0.82±0.36±0.24±0.27)%, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the ACP(D±→K0Sπ±) and ACP(D±s→ϕπ±) measurements used for calibration. The results represent the most precise measurements of these asymmetries to date

    Observation of ηc(2S)→ppˉ\eta_{c}(2S) \to p \bar p and search for X(3872)→ppˉX(3872) \to p \bar p decays

    Get PDF
    The first observation of the decay ηc(2S)→ppˉ\eta_{c}(2S) \to p \bar p is reported using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−13.0\rm \, fb^{-1} recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ηc(2S)\eta_{c}(2S) resonance is produced in the decay B+→[ccˉ]K+B^{+} \to [c\bar c] K^{+}. The product of branching fractions normalised to that for the J/ψJ/\psi intermediate state, Rηc(2S){\cal R}_{\eta_{c}(2S)}, is measured to be \begin{align*} {\cal R}_{\eta_{c}(2S)}\equiv\frac{{\mathcal B}(B^{+} \to \eta_{c}(2S) K^{+}) \times {\mathcal B}(\eta_{c}(2S) \to p \bar p)}{{\mathcal B}(B^{+} \to J/\psi K^{+}) \times {\mathcal B}(J/\psi\to p \bar p)} =~& (1.58 \pm 0.33 \pm 0.09)\times 10^{-2}, \end{align*} where the first uncertainty is statistical and the second systematic. No signals for the decays B+→X(3872)(→ppˉ)K+B^{+} \to X(3872) (\to p \bar p) K^{+} and B+→ψ(3770)(→ppˉ)K+B^{+} \to \psi(3770) (\to p \bar p) K^{+} are seen, and the 95\% confidence level upper limits on their relative branching ratios are % found to be RX(3872)<0.25×10−2{\cal R}_{X(3872)}<0.25\times10^{-2} and Rψ(3770))<0.10{\cal R}_{\psi(3770))}<0.10. In addition, the mass differences between the ηc(1S)\eta_{c}(1S) and the J/ψJ/\psi states, between the ηc(2S)\eta_{c}(2S) and the ψ(2S)\psi(2S) states, and the natural width of the ηc(1S)\eta_{c}(1S) are measured as \begin{align*} M_{J/\psi} - M_{\eta_{c}(1S)} =~& 110.2 \pm 0.5 \pm 0.9 \rm \, MeV, M_{\psi(2S)} -M_{\eta_{c}(2S)} =~ & 52.5 \pm 1.7 \pm 0.6 \rm \, MeV, \Gamma_{\eta_{c}(1S)} =~& 34.0 \pm 1.9 \pm 1.3 \rm \, MeV. \end{align*}Comment: 16 pages, 2 figures All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-016.htm

    Measurement of B0B^0, Bs0B^0_s, B+B^+ and Λb0\Lambda^0_b production asymmetries in 7 and 8 TeV proton-proton collisions

    Get PDF
    See paper for full list of authors - All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-062.html - Submitted to Phys. Lett. B.International audienceThe B0, B0s, B+ and Λ0b hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The measurements are performed as a function of transverse momentum and rapidity of the b hadrons within the LHCb detector acceptance. The overall production asymmetries, integrated over transverse momentum and rapidity, are also determined
    • 

    corecore