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CERN Accelerating science

LHCb Conference Contributions

Ostatnio dodane:
2020-10-29
15:57
Updated LHCb combination of the CKM angle $\gamma$ /LHCb Collaboration
The latest results of the CKM angle $\gamma$ combination are presented for the 2020 LHCb Implications Workshop. New and updated inputs from $B^+ \to Dh^+$ ($D\to h^+h^-$), $B^+ \to Dh^+$ ($D \to K^0_{\rm S} h^+h^-$), $B^+ \to Dh^+$ ($D \to K^0_{\rm S} K^+ \pi^-$), $B^+ \to D^*h^+$ ($D\to h^+h^-$), $B^0 \to D K^{*0}$ ($D\to h^+h^-$ and $D\to h^+\pi^-\pi^+\pi^-$) and $B^0_s \to D^\mp_s K^\pm \pi^\mp \pi^\pm$ ($D^+_s \to h^+ h^- \pi^+$) decays are included, where $h = K$ or $\pi$. [...]
LHCb-CONF-2020-003; CERN-LHCb-CONF-2020-003.- Geneva : CERN, 2020 - mult.p. Fulltext: LHCb-CONF-2020-003-figures - ZIP; LHCb-CONF-2020-003 - PDF;
In : Implications of LHCb measurements and future prospects, Cern, Switzerland, 28 - 30 Oct 2020

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2020-08-06
15:37
Combination of the ATLAS, CMS and LHCb results on the $B^0_{(s)} \to \mu^+ \mu^-$ decays /LHCb Collaboration
A combination of results on the rare $B^0_{s} \to \mu^+ \mu^-$ and $B^0 \to \mu^+ \mu^-$ decays from the ATLAS, CMS, and LHCb experiments using data collected at the Large Hadron Collider between 2011 and 2016, is presented. The $B^0_{s} \to \mu^+ \mu^-$ branching fraction is obtained to be $\left( 2.69\,^{+\, 0.37}_{-\, 0.35} \right) \times 10^{-9}$ and the effective lifetime of the $B^0_{s} \to \mu^+ \mu^-$ decay is measured to be $\tau_{B^0_{s} \to \mu^+ \mu^-} = 1.91^{+0.37}_{-0.35} \rm{ps}$. [...]
LHCb-CONF-2020-002; CERN-LHCb-CONF-2020-002.- Geneva : CERN, 2020 - 11. Fulltext: LHCb-CONF-2020-002-figures - ZIP; LHCb-CONF-2020-002 - PDF;
In : 40th International Conference on High Energy Physics, Prague, Czech Republic, 28 Jul - 6 Aug 2020

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2020-08-04
17:05
Measurement of the CKM angle $\gamma$ in $B^\pm\to D K^\pm$ and $B^\pm \to D \pi^\pm$ decays with $D \to K_\mathrm S^0 h^\pm h^\mp$ /LHCb Collaboration
A measurement of $CP$-violating observables is performed using the decays ${B^\pm \to D K^\pm}$ and ${B^\pm \to D \pi^\pm}$, where the $D$ meson is reconstructed in one of the self-conjugate three-body final states $K_\mathrm S^0\pi^+\pi^-$ and $K_\mathrm S^0 K^+ K^-$ ($h^\pm h^\mp = \pi^\pm \pi^\mp, K^\pm K^\mp$). The decays are analysed in bins of the $D$-decay phase space, leading to a measurement that is independent of the modelling of the $D$-decay amplitude. [...]
LHCb-CONF-2020-001; CERN-LHCb-CONF-2020-001.- Geneva : CERN, 2020 - 24. Fulltext: figures - ZIP; LHCb-CONF-2020-001 - PDF;
In : 40th International Conference on High Energy Physics, Prague, Czech Republic, 28 Jul - 6 Aug 2020

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2019-11-14
10:25
Multiplicity-dependent modification of $\chi_{c1}(3872)$ and $\psi{(2S)}$ production in $pp$ collisions at $\sqrt{s}$= 8 TeV /LHCb Collaboration
In $pp$ collisions at $\sqrt{s}$ = 8 TeV, $\chi_{c1}(3872)$ and $\psi{(2S)}$ states are produced promptly at the primary collision vertex or in decays of $b$~hadrons. We study their relative production rates as a function of particle multiplicity. [...]
LHCb-CONF-2019-005; CERN-LHCb-CONF-2019-005.- Geneva : CERN, 2019 - 13. Fulltext: figures_CONF_2019_005 - ZIP; LHCb-CONF-2019-005 - PDF;
In : The 28th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Wuhan, China, 3 - 9 Nov 2019

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2019-11-12
08:41
Measurement of $Z$ production cross-sections in proton-lead collisions at $ \sqrt{s_\rm{NN}}=8.16\ \rm{TeV}$ /LHCb Collaboration
This document describes a measurement of the $Z\to\mu^+\mu^-$ production cross-sections in proton-lead collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}=8.16\ \mathrm{TeV}$, using data collected by the LHCb detector in 2016. The dataset corresponds to an integrated luminosity of $30.8\,\mathrm{nb}^{-1}$, with $12.2\,\mathrm{nb}^{-1}$ for the forward ($p$Pb) configuration and $18.6\,\mathrm{nb}^{-1}$ for the backward (Pb$p$) configuration. [...]
LHCb-CONF-2019-003; CERN-LHCb-CONF-2019-003.- Geneva : CERN, 2019 - 16. Fulltext: LHCb-CONF-2019-003 - PDF; Figs_final - ZIP;
In : The 28th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Wuhan, China, 3 - 9 Nov 2019

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2019-11-12
08:38
Study of prompt $D^0$ meson production in $p$Pb at $\sqrt{s_{\mathrm{NN}}}= 8.16$ TeV at LHCb /LHCb Collaboration
The production of prompt $D^0$ mesons in proton-lead collisions in the forward and backward configurations is studied. The data are collected with the LHCb detector at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}= 8.16$ TeV and correspond to an integrated luminosity of $12.2\pm0.3~\mathrm{nb}^{-1}$ ($18.6\pm0.5~\mathrm{nb}^{-1}$) in the forward (backward) configuration. [...]
LHCb-CONF-2019-004; CERN-LHCb-CONF-2019-004.- Geneva : CERN, 2019 - 17. Fulltext: LHCb-CONF-2019-004-figures - ZIP; LHCb-CONF-2019-004 - PDF;
In : The 28th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Wuhan, China, 3 - 9 Nov 2019

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2019-09-16
15:22
Strong constraints on the $K^0_s \to \mu^+ \mu^-$ branching fraction /LHCb Collaboration
A search for the decay $K^0_s \to \mu^+ \mu^-$ is performed using proton-proton collision data, corresponding to an integrated luminosity of $5.6 \, \text {fb}^{-1}$, collected with the LHCb experiment during 2016, 2017 and 2018 at a center-of-mass energy of $13\,\mathrm{TeV}$. The observed number of signal decays is consistent with zero, yielding an upper limit of $\mathcal {B}( K^0_s \to \mu^+ \mu^-) < 2.2\,(2.6)\times 10^{-10}$ at $90$ $(95)\% ~\text {CL}$ [...]
LHCb-CONF-2019-002; CERN-LHCb-CONF-2019-002.- Geneva : CERN, 2019 - 9. Fulltext: PDF;
In : International Conference on Kaon Physics 2019, Perugia, Italy, 10 - 13 Sep 2019

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2019-05-17
11:08
Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays /LHCb Collaboration
A search for charge-parity ($CP$) violation in the time-dependent decay rates of $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays is reported. The data correspond to an integrated luminosity of $1.9\,{\rm fb}^{-1}$ collected by the LHCb detector in 2015--2016 in $pp$ collisions at a centre-of-mass energy of $13\,{\rm TeV}$ [...]
LHCb-CONF-2019-001; CERN-LHCb-CONF-2019-001.- Geneva : CERN, 2019 - 29. Fulltext: LHCb-CONF-2019-001 - PDF; LHCb-CONF-2019-001-figs - ZIP;

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2018-12-04
10:08
Prospects for searches for long-lived particles after the LHCb detector upgrades /LHCb Collaboration
The LHCb detector is a single-arm forward spectrometer covering the pseudorapidity range $2 < \eta < 5$, initially designed for the study of particles containing $b$ or $c$ quarks. As such, it is naturally suited for the search of beyond SM long-lived particles in a range of mass and lifetime not too dissimilar to heavy-flavour hadrons, as it has been demonstrated in several publications [...]
LHCb-CONF-2018-006; CERN-LHCb-CONF-2018-006.- Geneva : CERN, 2018 - 12. Fulltext: LHCb-CONF-2018-006 - PDF; LHCb_CONF_2018_006_figures - ZIP;

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2018-11-22
16:50
LHCb projections for proton-lead collisions during LHC Runs 3 and 4 /LHCb Collaboration
Projected sensitivities for selected LHCb measurements using proton-lead collisions during LHC Runs 3 and 4 are presented. The observables considered are Drell-Yan production with dimuon masses between 5 and 120 $GeV/c^2$ , correlations in the production of $D$ and $\overline D$ mesons, and the nuclear modification factor of $B^+$ meson production [...]
LHCb-CONF-2018-005; CERN-LHCb-CONF-2018-005.- Geneva : CERN, 2018 - 20. Fulltext: LHCb-CONF-2018-005 - PDF; ZIP - ZIP;

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