Study of the lineshape of the chi(c1) (3872) state

A study of the lineshape of the chi(c1) (3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb(-1) collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate chi(c1)(3872) and psi(2S) mesons from b-hadron decays are selected in the J/psi pi(+)pi(-) decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the chi(c1 )(3872) and psi(2S) states, Delta m, and the width of the chi(c1 )(3872) state, Gamma(Bw), are determined to be (Delta m=185.598 +/- 0.067 +/- 0.068 Mev,)(Gamma BW=1.39 +/- 0.24 +/- 0.10 Mev,) where the first uncertainty is statistical and the second systematic. Using a Flatte-inspired model, the mode and full width at half maximum of the lineshape are determined to be (mode=3871.69+0.00+0.05 MeV.)(FWHM=0.22-0.04+0.13+0.07+0.11-0.06-0.13 MeV, ) An investigation of the analytic structure of the Flatte amplitude reveals a pole structure, which is compatible with a quasibound D-0(D) over bar*(0) state but a quasivirtual state is still allowed at the level of 2 standard deviations

Measurement of the CKM angle γγ in B±→DK±B^\pm\to D K^\pm and B±→Dπ±B^\pm \to D π^\pm decays with D→KS0h+h−D \to K_\mathrm S^0 h^+ h^-

A measurement of $CP$-violating observables is performed using the decays $B^\pm\to D K^\pm$ and $B^\pm\to D \pi^\pm$, where the $D$ meson is reconstructed in one of the self-conjugate three-body final states $K_{\mathrm S}\pi^+\pi^-$ and $K_{\mathrm S}K^+K^-$ (commonly denoted $K_{\mathrm S} h^+h^-$). The decays are analysed in bins of the $D$-decay phase space, leading to a measurement that is independent of the modelling of the $D$-decay amplitude. The observables are interpreted in terms of the CKM angle $\gamma$. Using a data sample corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ collected in proton-proton collisions at centre-of-mass energies of $7$, $8$, and $13\,\text{TeV}$ with the LHCb experiment, $\gamma$ is measured to be $\left(68.7^{+5.2}_{-5.1}\right)^\circ$. The hadronic parameters $r_B^{DK}$, $r_B^{D\pi}$, $\delta_B^{DK}$, and $\delta_B^{D\pi}$, which are the ratios and strong-phase differences of the suppressed and favoured $B^\pm$ decays, are also reported

First Observation of Excited Omega(-)(b) States

We report four narrow peaks in the \u39eb0K- mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb-1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[\u3c9b(6316)-]=6315.64\ub10.31\ub10.07\ub10.50 MeV, m[\u3c9b(6330)-]=6330.30\ub10.28\ub10.07\ub10.50 MeV, m[\u3c9b(6340)-]=6339.71\ub10.26\ub10.05\ub10.50 MeV, m[\u3c9b(6350)-]=6349.88\ub10.35\ub10.05\ub10.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the \u39eb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be \u393[\u3c9b(6316)-]<2.8 MeV, \u393[\u3c9b(6330)-]<3.1 MeV and \u393[\u3c9b(6340)-]<1.5 MeV. The natural width of the \u3c9b(6350)- peak is 1.4-0.8+1.0\ub10.1 MeV, which is 2.5\u3c3 from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6\u3c3 to 7.2\u3c3. After accounting for the look-elsewhere effect, the significances of the \u3c9b(6316)- and \u3c9b(6330)- peaks are reduced to 2.1\u3c3 and 2.6\u3c3, respectively, while the two higher mass peaks exceed 5\u3c3. The observed peaks are consistent with expectations for excited \u3c9b- resonances