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CERN Document Server Encontrados 316 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.56 segundos. 
1.
Test of lepton flavour universality in $W$-boson decays into electrons and $\tau$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A measurement of the ratio of the branching fractions, $R_{\tau/e} = B(W \to \tau \nu)/ B(W \to e \nu)$, is performed using a sample of $W$ bosons originating from top-quark decays to final states containing $\tau$-leptons or electrons. [...]
arXiv:2412.11989 ; CERN-EP-2024-315. - 2024 - 50 p, 50.
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2.
Search for $D^0$ meson decays to $\pi^+ \pi^- e^+ e^-$ and $K^+ K^- e^+ e^-$ final states / LHCb Collaboration
A search for $D^0$ meson decays to the $\pi^+\pi^-e^+e^-$ and $K^+K^-e^+e^-$ final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. [...]
arXiv:2412.09414 ; LHCb-PAPER-2024-047 ; CERN-EP-2024-307 ; LHCB-PAPER-2024-047. - 2024 - 21.
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3.
Observation of the $K^+ \to \pi^+ \nu \bar\nu$ decay and measurement of its branching ratio / Cortina Gil, Eduardo (Louvain U., CP3) ; Jerhot, Jan (Louvain U., CP3 ; Munich, Max Planck Inst.) ; Lurkin, Nicolas (Louvain U., CP3) ; Bryman, Douglas (British Columbia U. ; TRIUMF) ; Numao, Toshio (TRIUMF) ; Velghe, Bob (TRIUMF) ; Wong, Vincent Wai Sum (TRIUMF) ; Hives, Zdenko (Charles U.) ; Husek, Tomas (Charles U. ; Birmingham U.) ; Kampf, Karol (Charles U.) et al.
A measurement of the $K^+ \to \pi^+ \nu \bar\nu$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016–2018 data taking. [...]
arXiv:2412.12015; CERN-EP-2024-343.- Geneva : CERN, 2024 - 29 p. Draft (restricted): PDF; Fulltext: CERN-EP-2024-343 - PDF; 2412.12015 - PDF;
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4.
Test of lepton universality with $B_s^0 \rightarrow \phi \ell^+\ell^-$ decays / LHCb Collaboration
Lepton flavour universality in rare $b\rightarrow s$ transitions is tested for the first time using $B_s^0$ meson decays. [...]
arXiv:2410.13748 ; LHCb-PAPER-2024-032 ; CERN-EP-2024-255 ; LHCB-PAPER-2024-032. - 2024 - 24.
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5.
Search for $B_{(s)}^{*0}\to \mu^+\mu^-$ in $B_c^+ \to \pi^+ \mu^+\mu^-$ decays / LHCb Collaboration
A search for the very rare $B^{*0}\to\mu^+\mu^-$ and $B_{s}^{*0}\to\mu^+\mu^-$ decays is conducted by analysing the $B_c^+\to \pi^+\mu^+\mu^-$ process [...]
arXiv:2409.17209 ; CERN-EP-2024-220 ; LHCb-PAPER-2024-026 ; LHCB-PAPER-2024-026. - 2024 - 23.
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6.
Analysis of $\it{\Lambda}^\mathrm{0}_b \rightarrow pK^-\mu^+\mu^-$ decays / LHCb Collaboration
The differential branching fraction and angular coefficients of ${\it{\Lambda}^\mathrm{0}_b \rightarrow pK^-\mu^+\mu^-}$ decays are measured in bins of the dimuon mass squared and dihadron mass. [...]
arXiv:2409.12629 ; CERN-EP-2024-212 ; LHCb-PAPER-2024-024. - 2024 - 33.
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7.
Study of the rare decay $J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-\mu^+\mu^-$ / LHCb Collaboration
The rare electromagnetic $J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-\mu^+\mu^-$ decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016--2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5.4\,\text{fb}^{-1}$. The rate of this decay is measured relative to that of the $J\mskip -3mu/\mskip -2mu\psi \to \mu^+\mu^-$ mode. [...]
arXiv:2408.16646; LHCb-PAPER-2024-016; CERN-EP-2024-201; LHCB-PAPER-2024-016.- Geneva : CERN, 2024-12-10 - 25 p. - Published in : JHEP 2412 (2024) 062 Fulltext: LHCb-PAPER-2024-016_arxiv - PDF; 2408.16646 - PDF; document - PDF; Related data file(s): ZIP;
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8.
Test of lepton flavor universality in semileptonic $ \mathrm{B}_{c}^{+} $ meson decays in proton-proton collisions at $ \sqrt{s}= $ 13 TeV / CMS Collaboration
A measurement of the ratio of branching fractions $ R(\mathrm{J}/\psi) = \mathcal{B}(\mathrm{B}_{c}^{+}\to\mathrm{J}/\psi\tau^{+}\nu_{\!\tau}) / \mathcal{B}(\mathrm{B}_{c}^{+}\to\mathrm{J}/\psi\mu^{+}\nu_{\!\mu}) $ in the $ \mathrm{J}/\psi\to\mu^{+}\mu^{-} $, $ \tau^{+}\to\mu^{+}\nu_{\!\mu}\overline{\nu}_{\!\tau} $ decay channel is presented. [...]
arXiv:2408.00678 ; CMS-BPH-22-012 ; CERN-EP-2024-180 ; CMS-BPH-22-012-003. - 2024 - 33.
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9.
Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s} = 13\,\rm{TeV}$ / LHCb Collaboration
Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $\sqrt{s}=13\,\rm{TeV}$ using decays to $p\bar{p}$ final state. The study is performed using a data sample corresponding to an integrated luminosity of $2.2\,\rm{fb}^{-1}$ collected in 2018 with the $\mbox{LHCb}$ detector. [...]
arXiv:2407.14261; LHCb-PAPER-2024-004; CERN-EP-2024-165; LHCB-PAPER-2024-004.- Geneva : CERN, 2024-12-09 - 19 p. - Published in : Eur. Phys. J. C 84 (2024) 1274 Fulltext: LHCb_PAPER_2024-004 - PDF; 2407.14261 - PDF; document - PDF; Related data file(s): ZIP;
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10.
Measurement of the branching fraction ratios $R(D^+)$ and $R(D^{*+})$ using muonic $\tau$ decays / LHCb Collaboration
The branching fraction ratios of $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^+\tau^-\overline{\nu}_{\tau}$ and $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^{*+}\tau^-\overline{\nu}_{\tau}$ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb$^{-1}$ collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 13\,\text{TeV}$. [...]
arXiv:2406.03387 ; LHCb-PAPER-2024-007 ; CERN-EP-2024-125 ; LHCB-PAPER-2024-007. - 2024 - 22.
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