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EP Preprints

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2020-01-10
10:58
Measurement of $|V_{cb}|$ with $B_s^0 \to D_s^{(*)-} \mu^+ \nu_{\mu}$ decays / LHCb Collaboration
The element $|V_{cb}|$ of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic $B_s^0$ decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. [...]
arXiv:2001.03225 ; LHCb-PAPER-2019-041 ; CERN-EP-2019-282 ; LHCB-PAPER-2019-041. - 2020. - 39 p.
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2020-01-06
15:42
First observation of excited $\Omega_b^-$ states / LHCb Collaboration
We report four narrow peaks in the $\Xi_b^0K^-$ 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. [...]
arXiv:2001.00851 ; LHCb-PAPER-2019-042 ; CERN-EP-2019-278 ; LHCB-PAPER-2019-042. - 2020. - 7 p.
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2019-12-26
04:23
Search for $C\!P$ violation and observation of $P$ violation in $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays / LHCb Collaboration
A search for $C\!P$ violation in the $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decay is performed using LHCb data corresponding to an integrated luminosity of 6.6$\,fb^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8 and 13$\,Te\kern -0.1em V$. [...]
arXiv:1912.10741 ; LHCB-PAPER-2019-028 ; CERN-EP-2019-256 ; LHCB-PAPER-2019-028. - 2020. - 17 p.
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2019-12-18
08:58
Test of lepton universality with $\Lambda^{0}_{b} \to p K^- \ell^+ \ell^-$ decays / LHCb Collaboration
The ratio of branching fractions of the decays $\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$ and $\Lambda^{0}_{b}\to pK^{-}\mu^{+}\mu^{-}$, $R^{-1}_{pK}$, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb$^{-1}$ recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. [...]
arXiv:1912.08139 ; LHCb-PAPER-2019-040 ; CERN-EP-2019-272 ; LHCB-PAPER-2019-040 ; LHCB-PAPER-2019-040-003 ; LHCB-PAPER-2019-040. - 2019. - 26 p.
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2019-12-09
13:47
Measurement of $CP$ violation in $B^0\to D^{*\pm} D^{\mp}$ decays / LHCb Collaboration
The decay-time-dependent $CP$ asymmetry in $B^0 \to D^{*\pm}D^{\mp}$ decays is measured using a data set corresponding to an integrated luminosity of$9$fb$^{-1}$ recorded by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. [...]
arXiv:1912.03723 ; LHCB-PAPER-2019-036. - 2019. - 28 p, 28 p.
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2019-12-05
10:43
Isospin amplitudes in $\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)$ and $\Xi_b^0\to J/\psi \Xi^0(\Lambda)$ decays / LHCb Collaboration
Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions, and allow searches for physics beyond the Standard Model. [...]
arXiv:1912.02110 ; CERN-EP-2019-268 ; LHCb-PAPER-2019-039 ; LHCB-PAPER-2019-039-003 ; LHCB-PAPER-2019-039. - 2019. - 20 p.
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2019-11-21
13:46
Precision measurement of the $\Xi_{cc}^{++}$ mass / LHCb Collaboration
A measurement of the $\Xi_{cc}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in $pp$ collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 $\mathrm{fb}^{-1}$. [...]
arXiv:1911.08594 ; LHCb-PAPER-2019-037 ; CERN-EP-2019-258 ; LHCB-PAPER-2019-037. - 2019. - 18 p.
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2019-11-20
14:12
Observation of the semileptonic decay $B^+ \to p \bar{p} \mu^+ \nu_\mu$ / LHCb Collaboration
The Cabibbo-suppressed semileptonic decay $B^{+}\to p\overline{p}\mu^{+}\nu_{\mu}$ is observed for the first time using a sample of $pp$ collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.9fb$^{-1}$ at centre-of-mass energies of 7, 8 and 13TeV, respectively. [...]
arXiv:1911.08187 ; LHCb-PAPER-2019-034 ; CERN-EP-2019-236 ; LHCB-PAPER-2019-034. - 2019. - 23 p.
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2019-11-15
09:29
Determination of quantum numbers for several excited charmed mesons observed in $B^- \to D^{*+} \pi^- \pi^-$ decays / LHCb Collaboration
A four-body amplitude analysis of the $B^- \to D^{*+} \pi^- \pi^-$ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. [...]
arXiv:1911.05957 ; CERN-EP-2019-201 ; LHCb-PAPER-2019-027 ; LHCB-PAPER-2019-027. - 2019. - 37 p.
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2019-11-12
12:18
Measurement of the $\eta_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s} = 13$ TeV / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of $2.0\,fb^{-1}$, collected by the LHCb experiment, the production of the $\eta_c(1S)$ state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13 \text{ TeV}$ is studied in the rapidity range ${2.0 < y < 4.5}$ and in the transverse momentum range ${6.5 < p_{T} < 14.0\text{ GeV}}$. [...]
arXiv:1911.03326 ; LHCb-PAPER-2019-024 ; CERN-EP-2019-214 ; LHCB-PAPER-2019-024. - 2019. - 29 p.
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