# EP Articles

2020-12-08
11:53
 Amplitude analysis of the $B^+ \to D^+ D^- K^+$ decay / LHCb Collaboration Results are reported from an amplitude analysis of the $B^+\to D^+D^-K^+$ decay. The analysis is carried out using LHCb proton-proton collision data taken at $\sqrt{s}=7,8,$ and $13$ TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$. [...] arXiv:2009.00026; LHCb-PAPER-2020-025; CERN-EP-2020-159.- 2020-12-07 - 48 p. - Published in : Phys. Rev. D 102 (2020) 112003 Article from SCOAP3: PDF; Fulltext: main_PRD - PDF; 2009.00026 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2020-10-28
10:53
 Observation of a new $\Xi_b^0$ state / LHCb Collaboration Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $\Xi_b^0$ resonance decaying to the $\Xi_b^-\pi^+$ final state is presented. The state, referred to as $\Xi_b(6227)^0$, has a measured mass and natural width of $m(\Xi_b(6227)^0) = 6227.1^{\,+1.4}_{\,-1.5}\pm0.5$ MeV, $\Gamma(\Xi_b(6227)^0) = 18.6^{\,+5.0}_{\,-4.1}\pm1.4$ MeV, where the uncertainties are statistical and systematic. [...] arXiv:2010.14485; LHCb-PAPER-2020-032; CERN-EP-2020-190; LHCB-PAPER-2020-032.- Geneva : CERN, 2021-01-07 - 17 p. - Published in : Phys. Rev. D 103 (2021) 012004 Article from SCOAP3: PDF; Fulltext: 2010.14485 - PDF; LHCb-PAPER-2020-032_toArXiv - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2020-10-23
15:39
 Measurement of the relative branching fractions of $B^+ \to h^+h^{\prime +}h^{\prime -}$ decays / LHCb Collaboration The relative branching fractions of $B^+ \to h^+h^{\prime +}h^{\prime -}$ decays, where $h^{(\prime)}$ is a pion or kaon, are measured. The analysis is performed with a data sample, collected with the LHCb detector, corresponding to an integrated luminosity of $3.0 {\rm fb}^{-1}$ of $pp$ collisions. [...] arXiv:2010.11802; CERN-EP-2020-189; LHCB-PAPER-2020-031.- Geneva : CERN, 2020-12-18 - 19 p. - Published in : Phys. Rev. D 102 (2020) 112010 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

2020-10-14
10:06
 Strong constraints on the $b \to s\gamma$ photon polarisation from $B^0\to K^{*0} e^+ e^-$ decays / LHCb Collaboration An angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay is performed using a data sample corresponding to an integrated luminosity of $9~fb^{-1}$ of $pp$ collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared ($q^2$) interval between $0.0008$ and $0.257~{\rm GeV}^2$, where the rate is dominated by the $B^0\to K^{*0}\gamma$ transition with a virtual photon [...] arXiv:2010.06011; LHCb-PAPER-2020-020; CERN-EP-2020-176; LHCB-PAPER-2020-020.- Geneva : CERN, 2020-12-11 - 25 p. - Published in : JHEP 2012 (2020) 081 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2020-020 - PDF; 2010.06011 - PDF; Related data file(s): ZIP;

2020-09-08
17:27
 Search for the doubly heavy $\mathit{\Xi}_{bc}^{0}$ baryon via decays to $D^0pK^-$ / LHCb Collaboration A search for the doubly heavy $\mathit{\Xi}_{bc}^{0}$ baryon using its decay to the $D^0pK^-$ final state is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment between 2016 and 2018, corresponding to an integrated luminosity of 5.4 $\mathrm{fb}^{-1}$. No significant signal is found in the invariant mass range from 6.7 to 7.2 $\mathrm{GeV}/c^2$. [...] arXiv:2009.02481; LHCb-PAPER-2020-014; CERN-EP-2020-137; LHCB-PAPER-2020-014.- Geneva : CERN, 2020 - 21 p. - Published in : JHEP 2011 (2020) 095 Article from SCOAP3: PDF; Fulltext: 2009.02481 - PDF; CDS-LHCb-PAPER-2020-014-arXiv - PDF; Related data file(s): ZIP;

2020-07-24
16:17
 First branching fraction measurement of the suppressed decay $\Xi_c^0\to \pi^-\Lambda_c^+$ / LHCb Collaboration The $\Xi_c^0$ baryon is unstable and usually decays into charmless final states by the $c \to s u\overline{d}$ transition. It can, however, also disintegrate into a $\pi^-$ meson and a $\Lambda_c^+$ baryon via $s$ quark decay or via $cs\to d c$ weak scattering. [...] arXiv:2007.12096; CERN-EP-2020-129; LHCb-PAPER-2020-016; LHCB-PAPER-2020-016.- Geneva : CERN, 2020-10-13 - 11 p. - Published in : Phys. Rev. D 102 (2020) 071101 Article from SCOAP3: PDF; Fulltext: Xic0-prl-sub - PDF; 2007.12096 - PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP;

2020-07-23
11:27
 First observation of the decay $\Lambda_b^0 \to \eta_c(1S) p K^-$ / LHCb Collaboration The decay $\Lambda_b^0 \to \eta_c(1S) p K^-$ is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 $fb^{-1}$, collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the $\Lambda_b^0 \to J/\psi p K^-$ decay as a normalisation mode, to be $\mathcal{B}(\Lambda_b^0 \to \eta_c(1S) p K^-)=(1.06\pm0.16\pm0.06^{+0.22}_{-0.19})\times10^{-4}$, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. [...] arXiv:2007.11292; CERN-EP-2020-124; LHCB-PAPER-2020-012.- Geneva : CERN, 2020-12-23 - 12 p. - Published in : Phys. Rev. D 102 (2020) 112012 Article from SCOAP3: PDF; Fulltext: 2007.11292 - PDF; LHCb-PAPER-2020-012-arxiv - PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2020-07-14
12:16
 Observation of enhanced double parton scattering in proton-lead collisions at $\sqrt{s_\mathrm{NN}}=8.16$ TeV / LHCb Collaboration A study of prompt charm-hadron pair production in proton-lead collisions at $\sqrt{s_\mathrm{NN}}= 8.16$ TeV is performed using data corresponding to an integrated luminosity of about 30 nb${}^{-1}$, collected with the LHCb experiment. Production cross-sections for different pairs of charm hadrons are measured and kinematic correlations between the two charm hadrons are investigated. [...] arXiv:2007.06945; LHCb-PAPER-2020-010; CERN-EP-2020-119; LHCB-PAPER-2020-010.- Geneva : CERN, 2020-11-20 - 13 p. - Published in : Phys. Rev. Lett. 125 (2020) 212001 Article from SCOAP3: PDF; Fulltext: 2007.06945 - PDF; Paper-2020-010 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2020-07-09
14:01
 First observation of the decay $B^0 \rightarrow D^0 \overline{D}{}^0 K^+ \pi^-$ / LHCb Collaboration The first observation of the decay $B^0 \rightarrow D^0 \overline{D}{}^0 K^+ \pi^-$ is reported using proton-proton collision data corresponding to an integrated luminosity of 4.7 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is performed in the full kinematically allowed range of the decay outside of the $D^{*-}$ region. [...] arXiv:2007.04280; CERN-EP-2020-112; LHCB-PAPER-2020-015.- 2020-09-23 - 11 p. - Published in : 10.1103/PhysRevD.102.051102 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP;

2020-07-06
14:43
 Searches for low-mass dimuon resonances / LHCb Collaboration Searches are performed for low-mass dimuon resonances, $X$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using a data sample corresponding to an integrated luminosity of 5.1 fb$^{-1}$ and collected with the LHCb detector. The $X \to \mu^+\mu^-$ decays can be either prompt-like or displaced from the proton-proton collision, where in both cases the requirements placed on the event and the assumptions made about the production mechanisms are kept as minimal as possible. [...] arXiv:2007.03923; LHCb-PAPER-2020-013; CERN-EP-2020-114; LHCB-PAPER-2020-013.- 2020-10-26 - 27 p. - Published in : JHEP 2010 (2020) 156 Article from SCOAP3: PDF; Fulltext: 2007.03923 - PDF; LHCb-PAPER-2020-013 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;