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EP Preprints

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2020-02-21
10:18
Measurement of $CP$ observables in $B^\pm \to D K^\pm$ and $B^\pm \to D \pi^\pm$ with $D \to K_{\rm{S}}^0 K^\pm \pi^\mp$ decays / LHCb Collaboration
Measurements of $CP$ observables in $B^\pm \to D K^\pm$ and $B^\pm \to D \pi^\pm$ decays are presented, where $D$ represents a superposition of $D^0$ and $\bar{D}^0$ states. [...]
arXiv:2002.08858 ; LHCB-PAPER-2019-044 ; CERN-EP-2020-015 ; LHCB-PAPER-2019-044-003 ; LHCB-PAPER-2019-044. - 2020. - 26 p, 26 p.
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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.
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2020-02-06
14:46
Report on the ECFA Early-Career Researchers Debate on the 2020 European Strategy Update for Particle Physics / Bethani, A. (ed.) (Cathol. U. Louvain (main)) ; Brondolin, E. (ed.) (CERN) ; Elliot, A.A. (ed.) (Queen Mary, U. of London (main)) ; García Pardiñas, J. (ed.) (U. Zurich (main)) ; Gilles, G. (ed.) (Bergische U., Wuppertal (main)) ; Gouskos, L. (ed.) (CERN) ; Gouveia, E. (ed.) (LIP, Minho) ; Graverini, E. (ed.) (Ecole Polytechnique, Lausanne) ; Hermansson-Truedsson, N. (ed.) (Lund U. (main)) ; Irles, A. (ed.) (U. Paris-Saclay) et al.
A group of Early-Career Researchers (ECRs) has been given a mandate from the European Committee for Future Accelerators (ECFA) to debate the topics of the current European Strategy Update (ESU) for Particle Physics and to summarise the outcome in a brief document [1]. A full-day debate with 180 delegates was held at CERN, followed by a survey collecting quantitative input. [...]
arXiv:2002.02837; CERN-OPEN-2020-006.- Geneva : CERN, 2020 - 48 p. Fulltext: ECR_EFCA_report_submission_date (1) - PDF; 2002.02837 - PDF; CERN-OPEN-2020-006 - PDF;

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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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