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CERN Document Server 59 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 0.96 segons. 
1.
Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer / AMS Collaboration
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of the deuteron (D) flux are presented. The measurements are based on 21×106 D nuclei in the rigidity range from 1.9 to 21 GV collected from May 2011 to April 2021. [...]
2024 - 8 p. - Published in : Phys. Rev. Lett. 132 (2024) 261001 Fulltext: PDF;
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2.
First search for $K^+ \to \pi^0 \pi \mu e$ decays / NA62 Collaboration
The first search for the lepton number violating decay $K^+ \to \pi^0 \pi^- \mu^+ e^+$ and lepton flavour violating decays $K^+ \to \pi^0 \pi^+ \mu^- e^+$, $K^+ \to \pi^0 \pi^+ \mu^+ e^-$ has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of $2.9\times 10^{-10}$, $3.1 \times 10^{-10}$ and $5.0 \times 10^{-10}$, respectively, are obtained at 90% CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions..
arXiv:2409.12981; CERN-EP-2024-224.- Geneva : CERN, 2024-11-12 - 9 p. - Published in : Phys. Lett. B 859 (2024) 139122 Draft (restricted): PDF; Fulltext: CERN-EP-2024-224 - PDF; 2409.12981 - PDF; Publication - PDF;
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3.
Temporal Structures in Positron Spectra and Charge-Sign Effects in Galactic Cosmic Rays / AMS Collaboration
We present the precision measurements of 11 years of daily cosmic positron fluxes in the rigidity range from 1.00 to 41.9 GV based on 3.4×106 positrons collected with the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station. The positron fluxes show distinctly different time variations from the electron fluxes at short and long timescales. [...]
2023 - 10 p. - Published in : Phys. Rev. Lett. 131 (2023) 151002 Fulltext: PDF;
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4.
Measurement of the $K^+ \to \pi^+ \gamma \gamma$ decay / NA62 Collaboration
A sample of 3984 candidates of the $K^+ \to \pi^+ \gamma \gamma$ decay, with an estimated background of $291 \pm 14$ events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. [...]
arXiv:2311.01837; CERN-EP-2023-247.- Geneva : CERN, 2024-02-07 - 11 p. - Published in : Phys. Lett. B 850 (2024) 138513 Draft (restricted): PDF; Fulltext: 2311.01837 - PDF; Publication - PDF; CERN-EP-2023-247 - PDF;
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5.
The NA62 level 0 calorimetric trigger fast readout implementation, commissioning and data taking performances / Ammendola, R (INFN, Rome2) ; Battista, D (INFN, Rome2) ; Paoluzzi, G (INFN, Rome2) ; Salamon, A (INFN, Rome2) ; Aliberti, R (U. Mainz, PRISMA) ; Barbanera, M (INFN, Perugia) ; Bonaiuto, V (Rome U., Tor Vergata) ; Ceccucci, A (CERN) ; Checcucci, B (INFN, Perugia) ; De Simone, N (CERN) et al.
The NA62 experiment at the CERN SPS aims to measure the branching ratio of the very rare kaon decay . The Calorimetric Level 0 Trigger identifies clusters in the electromagnetic and hadronic calorimeters. [...]
2023 - 9 p. - Published in : JINST 18 (2023) C02049
In : Topical Workshop on Electronics for Particle Physics 2022 (TWEPP 2022), Bergen, Norway, 19 - 23 Sep 2022, pp.C02049
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6.
NA62 results on Dark Sector searches / NA62 Collaboration
NA62 is a precision physics experiment studying charged kaons and their decayproducts with an unprecedented accuracy (measurement of the K + → π + ννbranching ratio of the order of 10 −11), allowing indirect probes of new physicsscales up to O(100) TeV. NA62 experiment also searches directly for weaklyinteracting particles of up to O(100) MeV masses in kaon decays and up to O(1)GeV masses when running in the beam dump mode. [...]
2022 - 16 p. - Published in : Frascati Phys. Ser.: 74 (2022) , pp. 269-284 Fulltext: PDF;
In : 18th Vulcano Workshop : Frontier Objects in Astrophysics and Particle Physics, Elba Island, Tuscany, Italy, 25 Sep - 1 Oct 2022, pp.269-284
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7.
Measurement of the very rare $K^+ \to \pi^+ \nu \bar\nu$ decay / NA62 Collaboration
The decay $K^+\to\pi^+\nu\bar{\nu}$, with a very precisely predicted branching ratio of less than $10^{-10}$, is among the best processes to reveal indirect effects of new physics. The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar{\nu}$ decay and to measure its branching ratio using a decay-in-flight technique. NA62 took data in 2016, 2017 and 2018, reaching the sensitivity of the Standard Model for the $K^+\to\pi^+\nu\bar{\nu}$ decay by the analysis of the 2016 and 2017 data, and providing the most precise measurement of the branching ratio to date by the analysis of the 2018 data. This measurement is also used to set limits on BR($K^+\to\pi^+X$), where $X$ is a scalar or pseudo-scalar particle. The final result of the BR($K^+\to\pi^+\nu\bar{\nu}$) measurement and its interpretation in terms of the $K^+\to\pi^+ X$ decay from the analysis of the full 2016-2018 data set is presented, and future plans and prospects are reviewed..
2022 - 6 p. - Published in : PoS DISCRETE2020-2021 (2022) 070 Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.070
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8.
New measurement of radiative decays at the NA62 Experiment at CERN: $K_{e3\gamma}$ / NA62 Collaboration
The NA62 experiment at CERN reports new results from studies of radiative kaon decays ($Ke3\gamma$) $K^+ \rightarrow \pi^0 e^+ \nu \gamma$, using a data sample %recorded collected in 2017-2018. The sample comprises O(100k) Ke3g candidates with sub-percent background contaminations. [...]
2022 - 6 p. - Published in : PoS DISCRETE2020-2021 (2022) 055 Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.055
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9.
Search for $K^+$ decays to a lepton and invisible particles / NA62 Collaboration
The NA62 experiment at CERN reports searches for $K^+ \to e^+ N$, $K^+ \to \mu^+ N$ and $K^+ \to \mu^+ X$ decays, where $N$ and $X$ are massive invisible particles, using the 2016-2018 data set. The $N$ particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of $O(10^{-9})$ and $O(10^{-8})$ on the neutrino mixing parameter $|U_{e4}|^2$ and $|U_{\mu 4}|^2$, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range. The $X$ particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for $X$ masses in the range 10-370 MeV/c$^2$ are reported for the first time, ranging from $O(10^{-5})$ to $O(10^{-7})$. An upper limit of $1.0 \cdot 10^{-6}$ is established at 90\% CL on the $K^+\to \mu^+ \nu \nu \bar{\nu}$ branching fraction..
2022 - 6 p. - Published in : PoS DISCRETE2020-2021 (2022) 056 Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.056
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10.
Search for $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state / NA62 Collaboration
The first search for ultra-rare $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017-2018. An upper limit of $1.4\times 10^{-8}$ at 90% CL is obtained for the branching ratio of the $K^+\to\pi^+e^+e^-e^+e^-$ decay, predicted in the Standard Model to be $(7.2 \pm0 .7)\times 10^{-11}$. [...]
arXiv:2307.04579; CERN-EP-2023-133.- Geneva : CERN, 2023-09-22 - 9 p. - Published in : Phys. Lett. B 846 (2023) 138193 Draft (restricted): PDF; Fulltext: CERN-EP-2023-133 - PDF; Publication - PDF; 2307.04579 - PDF;
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CERN Document Server : 59 registres trobats   1 - 10següentfinal  anar al registre:
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28 Barbanera, M
25 Barbanera, Mattia
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