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EP Preprints

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2020-02-19
14:43
Measurement of the branching fraction of the decay $B_s^0\to K_S^0 K_S^0$
A measurement of the branching fraction of the decay $B_s^0 \to K_S^0 K_S^0$ is performed using proton-proton collision data corresponding to an integrated luminosity of 5 fb$^{-1}$ collected by the LHCb experiment between 2011 and 2016. [...]
CERN-EP-2020-008 ; LHCB-PAPER-2019-030. - 2020.
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2020-02-13
10:15
Observation of a new baryon state in the $\Lambda_b^0\pi^+\pi^-$ mass spectrum / LHCb Collaboration
A new baryon state is observed in the $\Lambda_b^0\pi^+\pi^-$ mass spectrum with high significance using a data sample of $pp$ collisions, collected with the LHCb detector at centre-of-mass energies $\sqrt{s}=7, 8$ and $13$ TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. [...]
arXiv:2002.05112 ; CERN-EP-2020-013 ; LHCb-PAPER-2019-045 ; LHCB-PAPER-2019-045. - 2020. - 24 p, 24 p.
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2020-01-30
04:33
Strong constraints on the $K^0_{\mathrm{S}}\rightarrow\mu^{+}\mu^{-}$ branching fraction / LHCb Collaboration
A search for the decay $K^0_{\mathrm{S}}\rightarrow\mu^{+}\mu^{-}$ is performed using proton-proton collision data, corresponding to an integrated luminosity of $5.6\,\text{fb}^{-1}$ and collected with the LHCb experiment during 2016, 2017 and 2018 at a center-of-mass energy of $13\,\mathrm{TeV}$. [...]
arXiv:2001.10354 ; LHCb-PAPER-2019-038 ; CERN-EP-2019-285. - 2020. - 18 p.
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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 ; CERN-EP-2019-264 ; LHCB-PAPER-2019-036. - 2019. - 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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2019-11-20
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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