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EP Articles

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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 $\mathrm{fb}^{-1}$. The $\Xi_{cc}^{++}$ candidates are reconstructed via the decay modes $\Xi_{cc}^{++}\to\Lambda_c^+K^-\pi^+\pi^+$ and $\Xi_{cc}^{++}\to\Xi_c^+\pi^+$. [...]
arXiv:1911.08594; LHCb-PAPER-2019-037; CERN-EP-2019-258; LHCB-PAPER-2019-037.- 2020-02-07 - 18 p. - Published in : JHEP 2002 (2020) 049 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2019-037_arXiv - PDF; 1911.08594 - PDF; Related data file(s): ZIP; Supplementary Information: ZIP;

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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. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. [...]
arXiv:1911.05957; CERN-EP-2019-201; LHCb-PAPER-2019-027; LHCB-PAPER-2019-027.- Geneva : CERN, 2020-02-21 - 24 p. - Published in : Phys. Rev. D 101 (2020) 032005 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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2019-11-04
11:32
Updated measurement of decay-time-dependent CP asymmetries in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays / LHCb Collaboration
A search for decay-time-dependent charge-parity ($CP$) asymmetry in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13TeV, and corresponding to an integrated luminosity of 5.4fb$^{-1}$. The $D^0$ mesons are required to originate from semileptonic decays of $b$ hadrons, such that the charge of the muon identifies the flavor of the neutral $D$ meson at production. [...]
arXiv:1911.01114; CERN-EP-2019-225; LHCb-PAPER-2019-032; LHCB-PAPER-2019-032.- Geneva : CERN, 2020-01-14 - 12 p. - Published in : Phys. Rev. D 101 (2020) 012005 Article from SCOAP3: PDF; Figures: ZIP; Fulltext: PDF; Supplementary information: ZIP; External link: Figures

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2019-10-16
15:11
Search for $A' \to \mu^+ \mu^-$ decays / LHCb Collaboration
Searches are performed for both prompt-like and long-lived dark photons, $A'$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for $A'\!\to\!\mu^+\mu^-$ decays using a data sample corresponding to an integrated luminosity of 5.5fb$^{-1}$ collected with the LHCb detector. [...]
arXiv:1910.06926; LHCb-PAPER-2019-031; CERN-EP-2019-212; LHCB-PAPER-2019-031.- 2020-01-30 - 12 p. - Published in : Phys. Rev. Lett. 124 (2020) 041801 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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2019-10-03
13:53
More than preservation: Creating motivational designs and tailored incentives in research data repositories / Feger, Sebastian Stefan (CERN)
Preserving and sharing are core reproducible practices that require substantial efforts in preparing and documenting research data analyses. Dedicated tools and services are developed to support researchers in this process. [...]
CERN-OPEN-2019-007.- Geneva : CERN, 2019 - 5 p. Preprint: PDF;
In : Open Repositories 2019, Hamburg, Hamburg, Germany, 10 - 14 Jun 2019, pp.Open Repositories 2019

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2019-09-30
17:35
Search for the doubly charmed baryon $\Xi_{cc}^{+}$ / LHCb Collaboration
A search for the doubly charmed baryon $\Xi_{cc}^{+}$ is performed through its decay to the $\Lambda_c^+ K^- \pi^+$ final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13$\mathrm{\,Te\kern -0.1em V}$. The data correspond to a total integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:1909.12273; LHCb-PAPER-2019-029; CERN-EP-2019-199; LHCB-PAPER-2019-029.- Geneva : CERN, 2019-11-19 - 15 p. - Published in : Sci. China Phys. Mech. Astron. 63 (2020) 221062 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2019-09-13
11:15
Amplitude analysis of the $B^+ \to \pi^+ \pi^+ \pi^-$ decay / LHCb Collaboration
The results of an amplitude analysis of the charmless three-body decay $B^+ \to \pi^+ \pi^+ \pi^-$, in which $CP$-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. [...]
arXiv:1909.05212; LHCb-PAPER-2019-017; CERN-EP-2019-157; LHCB-PAPER-2019-017.- Geneva : CERN, 2020-01-21 - 46 p. - Published in : Phys. Rev. D 101 (2020) 012006 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2019-09-13
11:11
Observation of several sources of $CP$ violation in $B^+ \to \pi^+ \pi^+ \pi^-$ decays / LHCb Collaboration
Observations are reported of different sources of $CP$ violation from an amplitude analysis of $B^+ \to \pi^+ \pi^+ \pi^-$ decays, based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. A large $CP$ asymmetry is observed in the decay amplitude involving the tensor $f_2(1270)$ resonance, and in addition significant $CP$ violation is found in the $\pi^+ \pi^-$ S-wave at low invariant mass. [...]
arXiv:1909.05211; LHCb-PAPER-2019-018; CERN-EP-2019-156; LHCB-PAPER-2019-018.- 2020-01-21 - 11 p. - Published in : Phys. Rev. Lett. 124 (2020) 031801 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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2019-07-26
12:37
Measurement of CP violation in the $B_s^0\rightarrow\phi\phi$ decay and search for the $B^0\rightarrow\phi\phi$ decay / LHCb Collaboration
A measurement of the time-dependent CP-violating asymmetry in $B_s^0\rightarrow\phi\phi$ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of $5.0$fb$^{-1}$ collected by the $\mbox{LHCb}$ experiment at centre-of-mass energies $\sqrt{s} = 7$ TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 $B_s^0\rightarrow\phi\phi$ decays is obtained. [...]
arXiv:1907.10003; LHCb-PAPER-2019-019; CERN-EP-2019-121; LHCB-PAPER-2019-019.- Geneva : CERN, 2019-12-23 - 34 p. - Published in : JHEP 12 (2019) 155 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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2019-07-18
17:03
Precision measurement of the $\Lambda_c^+$, $\Xi_c^+$ and $\Xi_c^0$ baryon lifetimes / LHCb Collaboration
We report measurements of the lifetimes of the $\Lambda_c^+$, $\Xi_c^+$ and $\Xi_c^0$ charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment. The charm baryons are reconstructed through the decays $\Lambda_c^+\to pK^-\pi^+$, $\Xi_c^+\to pK^-\pi^+$ and $\Xi_c^0\to pK^-K^-\pi^+$, and originate from semimuonic decays of beauty baryons. [...]
arXiv:1906.08350; LHCb-PAPER-2019-008; CERN-EP-2019-122; LHCB-PAPER-2019-008.- 2019-08-02 - 12 p. - Published in : Phys. Rev. D 100 (2019) 032001 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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