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CERN Document Server Sök i 255 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 1.50 sekunder. 
1.
Search for the $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay / LHCb Collaboration
A search for the fully reconstructed $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$ TeV corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[2m_\mu,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 7.7\times10^{-8},~&m;(\mu\mu)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m;(\mu\mu)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95% confidence level. [...]
arXiv:2404.03375; LHCb-PAPER-2023-045; CERN-EP-2024-065.- 2024-07-11 - 28 p. - Published in : JHEP 2407 (2024) 101 Fulltext: 2404.03375 - PDF; document - PDF;
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2.
Prospects for searches of $b \to s \nu \bar{\nu}$ decays at FCC-eeProspects for searches of $ b\to s\nu \overline{\nu} $ decays at FCC-ee / Amhis, Yasmine (IJCLab, Orsay ; CERN) ; Kenzie, Matthew (Cambridge U.) ; Reboud, Méril (Durham U., IPPP) ; Wiederhold, Aidan R. (Warwick U.)
We investigate the physics reach and potential for the study of various decays involving a $b \to s \nu \bar{\nu}$ transition at the Future Circular Collider running electron-positron collisions at the $Z$-pole (FCC-ee). Signal and background candidates, which involve inclusive $Z$ contributions from $b\bar{b}$, $c\bar{c}$ and $uds$ final states, are simulated for a proposed multi-purpose detector. [...]
arXiv:2309.11353; EOS-2023-04; IPPP/23/51.- 2024-01-24 - 30 p. Fulltext: 2309.11353 - PDF; document - PDF;
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3.
Computing tools for effective field theories: SMEFT-Tools 2022 Workshop Report, 14–16th September 2022, Zürich / Aebischer, Jason (ed.) (Zurich U.) ; Fael, Matteo (ed.) (CERN) ; Fuentes-Martín, Javier (ed.) (CAFPE, Granada ; Granada U., Theor. Phys. Astrophys.) ; Thomsen, Anders Eller (ed.) (Basel U.) ; Virto, Javier (ed.) (U. Barcelona (main) ; Barcelona U. ; ICC, Barcelona U.) ; Allwicher, Lukas (Zurich U.) ; Das Bakshi, Supratim (CAFPE, Granada ; Granada U., Theor. Phys. Astrophys.) ; Bélusca-Maïto, Hermès (Zagreb U., Phys. Dept.) ; de Blas, Jorge (CAFPE, Granada ; Granada U., Theor. Phys. Astrophys.) ; Chala, Mikael (CAFPE, Granada ; Granada U., Theor. Phys. Astrophys.) et al.
In recent years, theoretical and phenomenological studies with effective field theories have become a trending and prolific line of research in the field of high-energy physics. In order to discuss present and future prospects concerning automated tools in this field, the SMEFT-Tools 2022 workshop was held at the University of Zurich from 14th-16th September 2022. [...]
arXiv:2307.08745.- 2024-02-19 - 115 p. - Published in : Eur. Phys. J. C 84 (2024) 170 Fulltext: document - PDF; 2307.08745 - PDF;
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4.
Measurement of the $\Lambda_c^+$ to $D^0$ production cross-section ratio in peripheral PbPb collisions / LHCb Collaboration
We report on a measurement of the $\Lambda^+_c$ to $D^0$ production ratio in PbPb collisions at $\sqrt{s_{\rm NN }}$ = 5.02 TeV with the LHCb detector in the forward rapidity region 2$<$ y $<$ 4.5. The $\Lambda^+_c$ ($D^0$) hadrons are reconstructed via the decay channel $ \Lambda^+_c \rightarrow p k^+ \pi^-$ ($D^0 \rightarrow k^-\pi^+$) for 2$ <
arXiv:2210.06939; LHCb-PAPER-2021-046; CERN-EP-2022-148; LHCB-PAPER-2021-046.- Geneva : CERN, 2023-06-22 - 17 p. Fulltext: 2210.06939 - PDF; document - PDF; LHCB-PAPER-2021-046 - PDF; erratum - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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5.
First measurement of $Z \to \mu^+\mu^-$ angular coefficients in the forward region of $pp$ collisions at $\sqrt{s} = 13$ TeV / LHCb Collaboration
The first study of the angular distribution of $\mu^+ \mu^-$ pairs produced in the forward rapidity region via the Drell-Yan reaction $pp \rightarrow \gamma^{*}/Z +X \rightarrow l^+ l^- + X$ is presented, using data collected with the LHCb detector at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.1 $\rm{fb}^{-1}$. The coefficients of the five leading terms in the angular distribution are determined as a function of the dimuon transverse momentum and rapidity. [...]
arXiv:2203.01602; LHCb-PAPER-2021-048; CERN-EP-2022-030; LHCB-PAPER-2021-048.- 2022-08-24 - 11 p. - Published in : Phys. Rev. Lett. 129 (2022) 091801 Fulltext: PDF; Related data file(s): ZIP; External link: Previous draft version
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6.
Amplitude analysis of the $\Lambda^+_c\to pK^-\pi^+$ decay and $\Lambda^+_c$ baryon polarization measurement in semileptonic beauty hadron decays / LHCb Collaboration
An amplitude analysis of $\Lambda^+_c \to pK^-\pi^+$ decays together with a measurement of the $\Lambda^+_c$ polarization vector in semileptonic beauty hadron decays is presented. A sample of $400\,000$ candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. [...]
arXiv:2208.03262; LHCb-PAPER-2022-002; CERN-EP-2022-124.- Geneva : CERN, 2023-07-01 - 27 p. - Published in : Phys. Rev. D 108 (2023) 012023 Fulltext: Publication - PDF; 2208.03262 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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7.
Dispersive analysis of Λ$_{b}$ → Λ(1520) local form factors / Amhis, Yasmine (IJCLab, Orsay) ; Bordone, Marzia (CERN) ; Reboud, Méril (Munich, Tech. U.)
We perform an analysis of $\Lb\to\L(1520)$ local form factors. We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region. [...]
arXiv:2208.08937; CERN-TH-2022-130; TUM-HEP-1422/22; EOS-2022-03.- Geneva : CERN, 2023-02-01 - 21 p. - Published in : JHEP 2302 (2023) 010 Fulltext: document - PDF; 2208.08937 - PDF;
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8.
Direct $CP$ violation in charmless three-body decays of $B^{\pm}$ mesons / LHCb Collaboration
Measurements of $CP$ asymmetries in charmless three-body decays of $B^\pm$ mesons are reported using proton-proton collision data collected by the LHCb detector, corresponding to an integrated luminosity of 5.9$\,$fb$^{-1}$. The previously observed $CP$ asymmetry in $B^\pm \to \pi^\pm K^+ K^-$ decays is confirmed, and $CP$ asymmetries are observed with a significance of more than five standard deviations in the $B^\pm \to \pi^\pm \pi^+ \pi^-$ and $B^\pm \to K^\pm K^+ K^-$ decays, while the $CP$ asymmetry of $B^\pm \to K^\pm \pi^+ \pi^-$ decays is confirmed to be compatible with zero. [...]
arXiv:2206.07622; LHCb-PAPER-2021-049; CERN-EP-2022-100.- Geneva : CERN, 2023-07-01 - 17 p. - Published in : Phys. Rev. D 108 (2023) 012008 Fulltext: 2206.07622 - PDF; LHCb-PAPER-2021-049 - PDF; Publication - PDF; LHCb-PAPER-2021-049-supplementary - ZIP; Related data file(s): ZIP;
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9.
Search for the rare hadronic decay $B_s^0\to p \bar{p}$ / LHCb Collaboration
A search for the rare hadronic decay $B_s^0\to p \bar{p}$ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb$^{-1}$. No evidence of the decay is found and an upper limit on its branching fraction is set at ${\cal B}(B_s^0\to p \bar{p}) < 4.4~(5.1) \times 10^{-9}$ at 90% (95%) confidence level; this is currently the world's best upper limit. [...]
arXiv:2206.06673; LHCb-PAPER-2022-004; CERN-EP-2022-102.- 2023-07-01 - 12 p. - Published in : Phys. Rev. D 108 (2023) 012007 Fulltext: 2206.06673 - PDF; Publication - PDF; LHCb_PAPER_2022_004 - PDF; Related data file(s): ZIP;
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10.
Search for direct $CP$ violation in charged charmless $B \to PV$ decays / LHCb Collaboration
Measurements of $CP$ asymmetry in charmless $B\to PV$ decays are presented, where $P$ and $V$ denote a pseudoscalar and a vector meson, respectively. Five different $B\to PV$ decays from four final states, $B^\pm \to \pi^\pm \pi^+ \pi^-$, $B^\pm \to K^\pm \pi^+ \pi^-$, $B^\pm \to K^\pm K^+ K^-$ and $B^\pm \to \pi^\pm K^+ K^-$ are analised. [...]
arXiv:2206.02038; LHCb-PAPER-2021-050; CERN-EP-2022-101.- Geneva : CERN, 2023-07-01 - 13 p. - Published in : Phys. Rev. D 108 (2023) 012013 Fulltext: 2206.02038 - PDF; LHCb-PAPER-2021-050 - PDF; Publication - PDF; Related data file(s): ZIP;
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