# EP Preprints

2017-11-21
11:13
 Search for excited $B_c^{+}$ states CERN-EP-2017-306 ; LHCB-PAPER-2017-042. - 2017. Additional information for the analysis - Fulltext - Previous draft version

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

2017-10-12
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

2017-10-05
22:10
 Generating a synthetic axion signal for cold cark matter axion searches using microwave cavities / Caspers, Fritz (CERN) ; Miceli, Lino (IBS, Daejeon) We demonstrated that an axion signal in a RF resonator can be synthesized and controlled with commercially available instrumentation. [...] CERN-OPEN-2017-023. - 2017. - 5 p. Preprint

2017-09-12
11:56
 Measurement of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$ TeVMeasurement of forward $Z \rightarrow b \bar{b}$ production in $pp$ collisions at $\sqrt{s}=8$~TeV / LHCb Collaboration The decay $Z \rightarrow b \bar{b}$ is reconstructed in $pp$ collision data, corresponding to 2 fb$^{-1}$ of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=8$ TeV. [...] LHCB-PAPER-2017-024 ; CERN-EP-2017-211 ; arXiv:1709.03458 ; LHCB-PAPER-2017-024-AND-CERN-EP-2017-211 ; LHCB-PAPER-2017-024. - 2017. Fulltext - Related data file(s) - Preprint

2017-09-08
16:35
 Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+\mu^{-}\overline{\nu}_{\mu}$ differential decay rate / LHCb Collaboration A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay decay ${\Lambda}^0_b \to \Lambda^+_c \mu^- \bar {\nu} _\mu$ is reported, using data corresponding to 3 fb$^{-1}$ collected with the LHCb detector in proton-proton collisions. [...] CERN-EP-2017-164 ; LHCB-PAPER-2017-016 ; arXiv:1709.01920. - 2017. - 24 p. Fulltext - Related data file(s) - Preprint