# EP Articles

Последно добавени:
2021-07-29
17:06
 Angular analysis of the rare decay $B_s^0\to\phi\mu^+\mu^-$ / LHCb Collaboration The abstract for the paper is An angular analysis of the rare decay $B^0_s\rightarrow\phi\mu^+\mu^-$ is presented, using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of $7$, $8$ and $13~\rm{TeV}$, corresponding to an integrated luminosity of 8.4~$\rm{fb}^{-1}$. The observables describing the angular distributions of the decay $B^0_s\rightarrow\phi\mu^+\mu^-$ are determined in regions of $q^2$, the square of the dimuon invariant mass. [...] arXiv:2107.13428; LHCb-PAPER-2021-022; CERN-EP-2021-138; LHCB-PAPER-2021-022.- 2021-11-08 - 45 p. - Published in : JHEP 2111 (2021) 043 Fulltext: document - PDF; main (1) - PDF; 2107.13428 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2021-07-23
14:23
 Observation of a $\Lambda_b^0-\overline{\Lambda}_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s} = 7 \textrm{ and } 8\,\textrm{TeV}$ / LHCb Collaboration This article presents differential measurements of the asymmetry between $\Lambda_b^0$ and $\overline{\Lambda}_b^0$ baryon production rates in proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and $8\,\textrm{TeV}$ collected with the LHCb experiment, corresponding to an integrated luminosity of $3\,\textrm{fb}^{-1}$. The $\Lambda_b^0$ baryons are reconstructed through the inclusive semileptonic decay $\Lambda_b^0\rightarrow\Lambda_c^+\mu^-\overline{\nu}_{\mu}X$. [...] arXiv:2107.09593; LHCb-PAPER-2021-016; CERN-EP-2021-121; LHCB-PAPER-2021-016.- 2021-10-07 - 38 p. - Published in : JHEP 2110 (2021) 060 Fulltext: Fulltext from publisher - PDF; 2107.09593 - PDF; document - PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Previous draft version

2021-07-09
12:19
 Observation of excited $\Omega_c^0$ baryons in $\Omega_b^- \to \Xi_c^+ K^-\pi^-$ decays / LHCb Collaboration The first observation of the $\Omega_b^-\to\Xi_c^+ K^- \pi^-$ decay is reported using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13\,\mathrm{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. Four excited $\Omega_c^0$ baryons are observed in the $\Xi_c^+ K^-$ mass projection of the $\Omega_b^-\to\Xi_c^+ K^- \pi^-$ decays with significance exceeding five standard deviations. [...] arXiv:2107.03419; CERN-EP-2021-109; LHCb-PAPER-2021-012; LHCB-PAPER-2021-012.- Geneva : CERN, 2021-11-01 - 28 p. - Published in : Phys. Rev. D 104 (2021) L091102 Fulltext: PDF; Related data file(s): ZIP;

2021-06-09
08:52
 Observation of the Mass Difference Between Neutral Charm-Meson Eigenstates / LHCb Collaboration A measurement of mixing and $C\!P$ violation in neutral charm mesons is performed using data reconstructed in proton-proton collisions collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4$\textrm{fb}^{-1}$. A total of $30.6$ million $D^{0}\rightarrow K^{0}_{\mathrm{S}}\pi^{+}\pi^{-}$ decays are analyzed using a method optimized for the measurement of the mass difference between neutral charm-meson eigenstates. [...] arXiv:2106.03744; LHCb-PAPER-2021-009; CERN-EP-2021-099; LHCB-PAPER-2021-009.- Geneva : CERN, 2021-09-07 - 12 p. - Published in : Phys. Rev. Lett. 127 (2021) 111801 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2021-05-31
08:49
 Branching Fraction Measurements of the Rare $B^0_s\rightarrow\phi\mu^+\mu^-$ and $B^0_s\rightarrow f_2^\prime(1525)\mu^+\mu^-$- Decays / LHCb Collaboration The branching fraction of the rare $B^0_s\rightarrow\phi\mu^+\mu^-$ decay is measured using data collected by the LHCb experiment at center-of-mass energies of $7$, $8$ and $13\,\rm{TeV}$, corresponding to an integrated luminosity of $9\,{\rm fb}^{-1}$. The branching fraction is reported in intervals of $q^2$, the square of the dimuon invariant mass. [...] arXiv:2105.14007; LHCb-PAPER-2021-014; CERN-EP-2021-092; LHCB-PAPER-2021-014.- Geneva : CERN, 2021-10-05 - 11 p. - Published in : Phys. Rev. Lett. 127 (2021) 151801 Fulltext: PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2021-05-21
11:32
 Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays / LHCb Collaboration A search for time-dependent violation of the charge-parity symmetry 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 from 2015 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. The $D^0$ meson is required to originate from a $D^*(2010)^+ \to D^0 \pi^+$ decay, such that its flavour at production is identified by the charge of the accompanying pion. [...] arXiv:2105.09889; LHCb-PAPER-2020-045; CERN-EP-2021-060; LHCB-PAPER-2020-045.- Geneva : CERN, 2021-10-01 - 39 p. - Published in : Phys. Rev. D 104 (2021) 072010 Fulltext: 2105.09889 - PDF; LHCb-PAPER-2020-045 - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2021-05-18
11:32
 Search for the doubly charmed baryon ${\it{\Omega}_{cc}^{+}}$ / LHCb Collaboration A search for the doubly charmed baryon $\it{\Omega}_{cc}^{+}$ with the decay mode $\it{\Omega}_{cc}^{+}\to\it{\Xi}_c^{+}K^{-}\pi^{+}$ is performed using proton-proton collision data at a centre-of-mass energy of 13$\mathrm{\,Te\kern -0.1em V}$ collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. No significant signal is observed within the invariant mass range of 3.6 to 4.0$\mathrm{\,Ge\kern -0.1em V}/c^2$. [...] arXiv:2105.06841; LHCb-PAPER-2021-011; CERN-EP-2021-068; LHCB-PAPER-2021-011.- 2021-08-31 - 12 p. - Published in : Sci. China Phys. Mech. Astron. 64 (2021) 101062 Fulltext: document - PDF; 2105.06841 - PDF; Fulltext from publisher: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

2021-05-06
16:33
 Lattice sites of implanted Na in GaN and AlN in comparison to other light alkalis and alkaline earths / Wahl, Ulrich (Universidade de Lisboa (PT)) ; David Bosne, Eric (Universidade de Lisboa (PT)) ; Amorim, Lígia (KU Leuven) ; Granadeiro Costa, Angelo Rafael (Universidade de Lisboa (PT)) ; De Vries, Bart (KU Leuven) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; da Silva, Manuel Ribeiro (CICECO Aveiro) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) ; Vantomme, André (KU Leuven) /IS634 Collaboration The lattice location of ion implanted radioactive 24Na (t1/2=14.96 h) in GaN and AlN was determined using the emission channeling technique at the ISOLDE/CERN facility. In the room temperature as-implanted state in both GaN and AlN, the majority of the sodium atoms are found on interstitial sites near the octahedral position, with a minority on cation Ga or Al substitutional sites. [...] CERN-ISOLDE-2021-003.- 2021 - 12 p. - Published in : J. Appl. Phys. 128 (2020) 045703 Postprint: PDF; Supplemental Material: PDF;

2021-05-06
16:10
 Direct Structural Identification and Quantification of the Split-Vacancy Configuration for Implanted Sn in Diamond / Wahl, Ulrich (Universidade de Lisboa (PT)) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; Villarreal, Renan (KU Leuven) ; Bourgeois, Emilie (Hasselt University) ; Gulka, Michal (Hasselt University) ; Nesladek, Milos (Hasselt University) ; Vantomme, André (KU Leuven) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) /EC-SLI Collaboration ; IS368 Collaboration We demonstrate formation of the ideal split-vacancy configuration of the Sn-vacancy center upon implantation into natural diamond. Using beta-emission channeling following low fluence 121Sn implantation (2E12 atoms/cm2, 60 keV) at the ISOLDE facility at CERN, we directly identified and quantified the atomic configurations of the Sn-related centers. [...] CERN-ISOLDE-2021-002.- 2021 - 7 p. - Published in : Phys. Rev. Lett. 125 (2020) 045301 Postprint: PDF; Supplemental material: PDF;

2021-05-06
15:34
 Angular analysis of ${B}^0\to {D}^{\ast -}{D}_s^{\ast +}$ with ${D}_s^{\ast +}\to {D}_s^{+}\gamma$ decays / LHCb Collaboration The first full angular analysis of the $B^0 \to D^{*-} D_s^{*+}$ decay is performed using 6 fb$^{-1}$ of $pp$ collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The $D_s^{*+} \to D_s^+ \gamma$ and $D^{*-} \to \bar{D}^0 \pi^-$ vector meson decays are used with the subsequent $D_s^+ \to K^+ K^- \pi^+$ and $\bar{D}^0 \to K^+ \pi^-$ decays. [...] arXiv:2105.02596; LHCb-PAPER-2021-006; CERN-EP-2021-056; LHCB-PAPER-2021-006.- Geneva : CERN, 2021-06-29 - 31 p. - Published in : JHEP 2106 (2021) 177 Fulltext: LHCb-PAPER-2021-006 - PDF; document - PDF; Related data file(s): ZIP;