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EP Preprints

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2020-03-31
14:24
Observation of new $\Xi_c^0$ baryons decaying to $\Lambda_c^+K^-$ / LHCb Collaboration
The $\Lambda_c^+K^-$ mass spectrum is studied with a data sample of $pp$ collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb$^{-1}$ collected by the LHCb experiment. [...]
arXiv:2003.13649 ; LHCb-PAPER-2020-004 ; CERN-EP-2020-038 ; LHCB-PAPER-2020-004. - 2020.
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2020-03-11
09:27
Search for the lepton flavour violating decay $B^+ \to K^+ \mu^- \tau^+$ using $B^{*0}_{s2}$ decays / LHCb Collaboration
A search is presented for the lepton flavour violating decay $B^+ \rightarrow K^+ \mu^- \tau^+$ using a sample of proton--proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb${}^{-1}$. [...]
arXiv:2003.04352 ; LHCb-PAPER-2019-043 ; CERN-EP-2020-020 ; LHCB-PAPER-2019-043. - 2020. - 19 p, 19 p.
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2020-03-10
11:48
Measurement of $C\!P$-averaged observables in the $B^{0}\rightarrow K^{*0}\mu^{+}\mu^{-}$ decay / LHCb Collaboration
An angular analysis of the $B^{0}\rightarrow K^{*0}(\to K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented using a data set corresponding to an integrated luminosity of $4.7{\mbox{\,fb}^{-1}}$ of $pp$ collision data collected with the LHCb experiment. [...]
arXiv:2003.04831 ; LHCb-PAPER-2020-002 ; CERN-EP-2020-027 ; LHCB-PAPER-2020-002. - 2020. - 45 p, 45 p.
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2020-03-09
11:43
Search for the rare decays $B_s^0 \to e^+e^-$ and $B^0 \to e^+e^-$ / LHCb Collaboration
A search for the decays $B^0_s\to e^+e^-$ and $B^0\to e^+e^-$ is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of $7$, $8$ and $13\,\text{TeV}$, corresponding to integrated luminosities of $1$, $2$ and $2\,\text{fb}^{-1}$, respectively. [...]
arXiv:2003.03999 ; LHCb-PAPER-2020-001 ; CERN-EP-2020-023 ; LHCB-PAPER-2020-001. - 2020. - 20 p, 20 p.
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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.
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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.) (IJCLab, Orsay) 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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