Due to the migration of the videos collection, the submission of videos is currently disabled.

# LHCb Papers

Последние добавления:
2017-11-20
10:26
 Measurement of branching fractions of charmless four-body $\Lambda_b^0$ and $\Xi_b^0$ decays / LHCb Collaboration A search for charmless four-body decays of $\Lambda_b^0$ and $\Xi_b^0$ baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. [...] CERN-EP-2017-278 ; LHCB-PAPER-2017-034 ; arXiv:1711.05490 ; LHCB-PAPER-2017-034. - 2017. Fulltext - Related data file(s) - Preprint

2017-11-16
16:44
 Measurement of the ratio of branching fractions $\mathcal{B}(B_c^+\,\to\,J/\psi\tau^+\nu_\tau)$/$\mathcal{B}(B_c^+\,\to\,J/\psi\mu^+\nu_\mu)$ / LHCb Collaboration A measurement is reported of the ratio of branching fractions $\mathcal{R}(J/\psi)=\mathcal{B}(B_c^+\,\to\,J/\psi\tau^+\nu_\tau)/\mathcal{B}(B_c^+\,\to\,J/\psi \mu^+\nu_\mu)$, where the $\tau^+$ lepton is identified in the decay mode $\tau^+\,\to\,\mu^+\nu_\mu\overline{\nu}_\tau$. [...] LHCB-PAPER-2017-035 ; CERN-EP-2017-275 ; arXiv:1711.05623 ; LHCB-PAPER-2017-035. - 2017. Fulltext - Related data file(s) - Preprint - Supplementary information

2017-11-16
09:10
 First observation of $B^{+} \to D_s^{+}K^{+}K^{-}$ decays and a search for $B^{+} \to D_s^{+}\phi$ decays / LHCb Collaboration A search for $B^{+} \to D_s^{+}K^{+}K^{-}$ decays is performed using $pp$ collision data corresponding to an integrated luminosity of 4.8 fb$^{-1}$, collected at centre-of-mass energies of 7, 8 and 13$\,$TeV with the LHCb experiment. [...] LHCB-PAPER-2017-032 ; CERN-EP-2017-289 ; arXiv:1711.05637 ; LHCB-PAPER-2017-032. - 2017. Fulltext - Related data file(s) - Preprint

2017-11-03
16:04
 Measurements of $\Lambda_c^+ \to p K^-K^+$, $\Lambda_c^+ \to p \pi^-\pi^+$ and $\Lambda_c^+ \to p \pi^-K^+$ branching ratios / LHCb Collaboration The ratios of the branching fractions of the decays $\Lambda_{c}^{+} \rightarrow p \pi^{-} \pi^{+}$, $\Lambda_{c}^{+} \rightarrow p K^{-} K^{+}$, and $\Lambda_{c}^{+} \rightarrow p \pi^{-} K^{+}$ with respect to the Cabibbo-favoured $\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+}$ decay are measured using proton-proton collision data collected with the LHCb experiment at a 7 TeV centre-of-mass energy and corresponding to an integrated luminosity of 1.0 fb$^{-1}$: \begin{align*} \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p \pi^{-} \pi^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (7.44 \pm 0.08 \pm 0.18)\,\%, \\ \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} &= (1.70 \pm 0.03 \pm 0.03)\,\%, \\ \frac{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p \pi^{-} K^{+})}{\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})} & = (0.165 \pm 0.015 \pm 0.005 )\,\%, \end{align*} where the uncertainties are statistical and systematic, respectively. [...] CERN-EP-2017-247 ; LHCB-PAPER-2017-026 ; arXiv:1711.01157 ; LHCB-PAPER-2017-026. - 2017. Fulltext - Related data file(s) - Preprint

2017-10-17
16:52
 Measurement of the $B^{\pm}$ production cross-section in pp collisions at $\sqrt{s} =$ 7 and 13 TeV / LHCb Collaboration The production of $B^{\pm}$ mesons is studied in $pp$ collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm}\rightarrow J/\psi K^{\pm}$ decays and data samples corresponding to 1.0 fb$^{-1}$ and 0.3 fb$^{-1}$, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range $0 2017-10-12 14:36  Search for the lepton-flavour violating decays$B^0_{(s)} \rightarrow e^\pm \mu^\mp$/ LHCb Collaboration A search for the lepton-flavour violating decays$B^0_s \rightarrow e^\pm \mu^\mp$and$B^0 \rightarrow e^\pm \mu^\mp$is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity of 3$\mbox{fb}^{-1}$, collected with the LHCb experiment at centre-of-mass energies of$7$and$8 ~ \text {TeV}$. [...] LHCB-PAPER-2017-031 ; CERN-EP-2017-242 ; arXiv:1710.04111 ; LHCB-PAPER-2017-031. - 2017. - 19 p. Fulltext - Related data file(s) - Preprint - Supplementary information 2017-10-09 10:08  Search for dark photons produced in 13 TeV$pp$collisions / LHCb Collaboration Searches are performed for both prompt-like and long-lived dark photons,$A^{\prime}$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using$A^{\prime}\to\mu^+\mu^-$decays and a data sample corresponding to an integrated luminosity of 1.6 fb$^{-1}$collected with the LHCb detector. [...] LHCB-PAPER-2017-038 ; CERN-EP-2017-248 ; arXiv:1710.02867 ; LHCB-PAPER-2017-038. - 2017. - 23 p, 23 p. Fulltext - Related data file(s) - Preprint 2017-09-18 16:32  Measurement of$CP$observables in$B^{\pm} \rightarrow D K^{*\pm}$decays using two- and four-body$D$final states / LHCb Collaboration Measurements of$CP$observables in$B^{\pm} \rightarrow D K^{*\pm}$decays are presented, where$D$denotes a superposition of$D^0$and$\overline{D^0}$meson states. Decays of the$D$meson to$K^{-}\pi^{+}$,$K^{-}K^{+}$,$\pi^{-}\pi^{+}$,$K^{-}\pi^{+}\pi^{-}\pi^{+}$and$\pi^{-}\pi^{+}\pi^{-}\pi^{+}$are used and the$K^{*\pm}$meson is reconstructed in the$K^{0}_{\mathrm{S}}\pi^{\pm}$final state. [...] LHCB-PAPER-2017-030; CERN-EP-2017-208; arXiv:1709.05855; LHCB-PAPER-2017-030.- Geneva : CERN, 2017-11-23 - 27 p. - Published in : JHEP 11 (2017) 156 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP; 2017-09-15 14:53  Precise measurement of the$\chi_{c1}$and$\chi_{c2}$resonance parameters with the decays$\chi_{c1,c2}\to J/\psi\mu^+\mu^-$/ LHCb Collaboration The decays$\chi_{c1} \rightarrow J/\psi \mu^+ \mu^-$and$\chi_{c2} \rightarrow J/\psi \mu^+ \mu^-$are observed and used to study the resonance parameters of the$\chi_{c1}$and$\chi_{c2}mesons. The masses of these states are measured to be \begin{align*} m(\chi_{c1}) = 3510.71 \pm 0.04(stat) \pm 0.09(syst)MeV\,, m(\chi_{c2}) = 3556.10 \pm 0.06(stat) \pm 0.11(syst)MeV\,, \end{align*} where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. [...] CERN-EP-2017-228; LHCB-PAPER-2017-036; arXiv:1709.04247; LHCB-PAPER-2017-036.- Geneva : CERN, 2017-11-28 - 9 p. - Published in : Phys. Rev. Lett. 119 (2017) 221801 Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP; 2017-09-14 12:21  Measurement ofCP$violation in$B^0\rightarrow J/\psi K^0_\mathrm{S}$and$B^0\rightarrow\psi(2S) K^0_\mathrm{S}$decays / LHCb Collaboration A measurement is presented of decay-time-dependent$CP$violation in the decays$B^0\rightarrow J/\psi K^0_\mathrm{S}$and$B^0\rightarrow\psi(2S) K^0_\mathrm{S}$, where the$J/\psi$is reconstructed from two electrons and the$\psi(2S)$from two muons. The analysis uses a sample of$pp$collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3$\mathrm{fb}^{-1}\$. [...] LHCB-PAPER-2017-029; CERN-EP-2017-209; arXiv:1709.03944; LHCB-PAPER-2017-029.- Geneva : CERN, 2017-11-27 - 18 p. - Published in : JHEP 11 (2017) 170 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP;