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CERN Document Server 找到 320 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.59 秒. 
1.
Prompt and nonprompt $\psi(2S)$ production in $p$Pb collisions at $\sqrt{s_{NN}}=8.16$ TeV / LHCb Collaboration
The production of $\psi(2S)$ mesons in proton-lead collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=8.16$ TeV is studied with the LHCb detector using data corresponding to an integrated luminosity of 34 nb$^{-1}$. The prompt and nonprompt $\psi(2S)$ production cross-sections and the ratio of the $\psi(2S)$ to $J/\psi$ cross-section are measured as a function of the meson transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame, together with forward-to-backward ratios and nuclear modification factors. [...]
arXiv:2401.11342; LHCb-PAPER-2023-024; CERN-EP-2023-293.- Geneva : CERN, 2024-04-19 - 55 p. - Published in : JHEP 2404 (2024) 111 Fulltext: 2401.11342 - PDF; document - PDF; Related data file(s): ZIP;
2.
Electron-beam energy reconstruction for neutrino oscillation measurements / CLAS Collaboration
Neutrinos exist in one of three types or ‘flavours’—electron, muon and tau neutrinos—and oscillate from one flavour to another when propagating through space. This phenomena is one of the few that cannot be described using the standard model of particle physics (reviewed in ref. 1), and so its experimental study can provide new insight into the nature of our Universe (reviewed in ref. 2). [...]
2021 - 20 p. - Published in : Nature 599 (2021) 565-570
3.
Photoproduction of the $f_2(1270)$ meson using the CLAS detector / CLAS Collaboration
The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state made from the attractive interaction of two $\rho$-mesons. [...]
arXiv:2010.16006; JLAB-PHY-20-3279.- 2021-02-25 - 6 p. - Published in : Phys. Rev. Lett. 126 (2021) 082002 Fulltext: PDF; External link: JLAB
4.
Measurements of $CP$ asymmetries in charmless four-body $\Lambda^0_b$ and $\Xi_b^0$ decays / LHCb Collaboration
A search for $CP$ violation in charmless four-body decays of $\Lambda^0_b$ and $\Xi_b^0$ baryons with a proton and three charged mesons in the final state is performed. To cancel out production and detection charge-asymmetry effects, the search is carried out by measuring the difference between the $CP$ asymmetries in a charmless decay and in a decay with an intermediate charmed baryon with the same particles in the final state. [...]
arXiv:1903.06792; LHCb-PAPER-2018-044; CERN-EP-2019-13; LHCb-PAPER-2018-044 and CERN-EP-2019-13; LHCB-PAPER-2018-044.- 2019-09-07 - 30 p. - Published in : Eur. Phys. J. C Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
5.
Dalitz Plot analysis of the $D^+ \to K^- K^+ K^+$ decay / LHCb Collaboration
The resonant structure of the doubly Cabibbo-suppressed decay $D^+\to K^-K^+K^+$ is studied for the first time. The measurement is based on a sample of $pp$-collision data, collected at a centre-of-mass energy of 8 TeV with the LHCb detector and corresponding to an integrated luminosity of 2 fb$^-1$. [...]
arXiv:1902.05884; LHCb-PAPER-2018-039; CERN-EP-2018-336.- Geneva : CERN, 2019-04-08 - 37 p. - Published in : JHEP 04 (2019) 063 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
6.
Measurement of the ratio of branching fractions of the decays $\Lambda_b^0 \!\to \psi(2S) \Lambda$ and $\Lambda_b^0 \!\to J\!/\!\psi \Lambda$ / LHCb Collaboration
Using $pp$ collisions corresponding to 3$\,\text{fb}^{-1}$ integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8$\,\text{TeV}$, the ratio of branching fractions \begin{align*} \mathcal{B}(\Lambda^0_b\!\to\psi(2S) \Lambda )/\mathcal{B}(\Lambda^0_b\!\to J/\psi \Lambda)= 0.513 \pm 0.023\, (\text{stat}) \pm 0.016 \, (\text{syst}) \pm 0.011\, (\mathcal{B}) \end{align*} is determined. The first uncertainty is statistical, the second is systematic and the third is due to the external branching fractions used..
arXiv:1902.02092; LHCb-PAPER-2017-041; CERN-EP-2019-003.- Geneva : CERN, 2019-03-22 - 16 p. - Published in : JHEP 03 (2019) 126 Article from SCOAP3: PDF; Fulltext: LHCb-Paper-2017-041 - PDF; 1902.02092 - PDF; Related data file(s): ZIP;
7.
Observation of the doubly Cabibbo-suppressed decay $\Xi_{c}^{+}\to p\phi$ / LHCb Collaboration
The doubly Cabibbo-suppressed decay $\Xi_{c}^{+}\to p\phi$ with $\phi\to K^{+}K^{-}$ is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb$^{-1}$ recorded with the LHCb detector in $pp$ collisions at a centre-of-mass energy of 8 TeV. [...]
arXiv:1901.06222; LHCb-PAPER-2018-040; CERN-EP-2018-349.- 2019-04-10 - 17 p. - Published in : JHEP 04 (2019) 084 Article from SCOAP3: PDF; Fulltext: PDF;
8.
Model-independent observation of exotic contributions to $B^0\to J/\psi K^+\pi^-$ decays / LHCb Collaboration
An angular analysis of $B^0\to J/\psi K^+\pi^-$ decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3 ${\rm fb}^{-1}$ collected with the LHCb detector. The $m(K^+\pi^-)$ spectrum is divided into fine bins. [...]
arXiv:1901.05745; LHCb-PAPER-2018-043; CERN-EP-2018-330.- Geneva : CERN, 2019-04-18 - 10 p. - Published in : Phys. Rev. Lett. 122 (2019) 152002 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP;
9.
Measurement of the branching fraction and $C\!P$ asymmetry in $B^{+}\rightarrow J/\psi \rho^{+}$ decays / LHCb Collaboration
The branching fraction and direct $C\!P$ asymmetry of the decay $B^{+}\rightarrow J/\psi \rho^{+}$ are measured using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to a total integrated luminosity of 3$\mbox{fb}^{-1}$. The following results are obtained: \begin{align} \mathcal{B}(B^{+}\rightarrow J/\psi \rho^{+}) &= (3.81 ^{+0.25}_{-0.24} \pm 0.35) \times 10^{-5}, \nonumber \\ \mathcal{A}^{C\!P} (B^{+}\rightarrow J/\psi \rho^{+}) &= -0.045^{+0.056}_{-0.057} \pm 0.008, \nonumber \end{align} where the first uncertainties are statistical and the second systematic. [...]
arXiv:1812.07041; LHCb-PAPER-2018-036; CERN-EP-2018-298; LHCB-PAPER-2018-036.- Geneva : CERN, 2019-06-24 - 21 p. - Published in : Eur. Phys. J. C 79 (2019) 537 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
10.
Search for the rare decay $B^{+} \rightarrow \mu^{+}\mu^{-}\mu^{+}\nu_{\mu}$ / LHCb Collaboration
A search for the rare leptonic decay $B^{+} \rightarrow \mu^{+}\mu^{-}\mu^{+}\nu_{\mu}$ is performed using proton-proton collision data corresponding to an integrated luminosity of $4.7$ fb$^{-1}$ collected by the LHCb experiment. The search is carried out in the region where the lowest of the two $\mu^{+}\mu{-}$ mass combinations is below $980$ MeV/$c^{2}$. [...]
arXiv:1812.06004; CERN-EP-2018-293; LHCb-PAPER-2018-037.- Geneva : CERN, 2019-08-13 - 20 p. - Published in : Eur. Phys. J. C 79 (2019) 675 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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