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LHCb Papers

Ostatnio dodane:
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.
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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.
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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.
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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.
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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 $0<p_{\text{T}}< 40$ GeV/$c$ and the rapidity range $2.0<y<4.5$ are measured to be $\sigma(pp \rightarrow B^{\pm} X, \sqrt{s} = \text{7 TeV}) = 43.0 \pm 0.2 \pm 2.5 \pm 1.7\mu b,$ $\sigma(pp \rightarrow B^{\pm} X, \sqrt{s} = \text{13 TeV}) = 86.6 \pm 0.5 \pm 5.4 \pm 3.4\mu b,$ where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the $B^{\pm}\rightarrow J/\psi K^{\pm}$ branching fraction. [...]
CERN-EP-2017-254; LHCB-PAPER-2017-037; arXiv:1710.04921; LHCB-PAPER-2017-037.- Geneva : CERN, 2017 - 22 p. - Published in : JHEP 1712 (2017) 026 Article from SCOAP3: PDF; Preprint: 1710.04921 - PDF; arXiv:1710.04921 - PDF; Related data file(s): ZIP;

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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.
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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.
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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;

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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;

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2017-09-14
12:21
Measurement of $CP$ 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;

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