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CERN Document Server 27 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 0.55 segons. 
1.
Latest results on rare kaon decays from the NA48/2 experiment at CERN / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the K->pi0e+e-decay from an exposure of 1.7x10^11 charged kaon decays recorded in 2003-2004. A sample of 4919candidates with 4.9% background contamination allows the determination of the branching ratioin the full kinematic region. [...]
SISSA, 2021 - 6 p. - Published in : PoS ICHEP2020 (2021) 413 Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.413
2.
Precision measurement of the form factors of semileptonic charged kaon decays from NA48/2 / NA48/2 Collaboration
We present a measurement of the charged kaon semileptonic form factors based on 4.3 million $K^± → π^0 e^± \nu_e$ and 2.9 million $K^± → π^0 μ^± \nu_μ$ decays collectedby the NA48/2 experiment. The single results for the semi-electronic and semi-muonic channel have better and similar precision, respectively, than previousmeasurements. [...]
2018 - 4 p. - Published in : (2018) , pp. 315-318
In : 53rd Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 17 - 24 Mar 2018, pp.315-318
3.
First observation and study of the $K^{\pm} \to \pi^{\pm} \pi^{0} e^{+} e^{-}$ decay / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay from an exposure of $1.7 \times 10^{11}$ charged kaon decays recorded in $2003-2004$. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR($K^\pm \to \pi^\pm \pi^0 e^+ e^-)=(4.24 \pm 0.14)\times10^{-6}$. [...]
arXiv:1809.02873; CERN-EP-2018-246.- Geneva : CERN, 2019-01-10 - 10 p. - Published in : Phys. Lett. B 788 (2019) 552-561 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-246 - PDF; 1809.02873 - PDF;
4.
Study of $\pi^0$ Dalitz decays in the NA62 and NA48/2 experiments / Maurice, E (Liverpool U.) ; Ambrosino, F ; Antonelli, A ; Anzivino, G ; Arcidiacono, R ; Baldini, W ; Balev, S ; Bifani, S ; Biino, C ; Bizzeti, A et al. /NA62 ; NA48/2
The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. [...]
2017 - 5 p. - Published in : Nucl. Part. Phys. Proc. 282-284 (2017) 106-110
In : 19th High-Energy Physics International Conference in Quantum Chromodynamics (QCD), Montpellier, France, 4 - 8 Jul 2016, pp.106-110
5.
Model independent measurement of the leptonic kaon decay $K^{\pm}\to \mu^{\pm}\nu_{\mu}e^{+} e^-$ with the NA48/2 experiment / Marchevski, Radoslav (Mainz U.) ; Arcidiacono, R ; Baldini, W ; Balev, S ; Batley, J R ; Behler, M ; Bifani, S ; Biino, C ; Bizzeti, A ; Bloch-Devaux, B et al. /NA48/2
A measurement of the branching ratio of the rare leptonic kaon decay K ± → μ ± ν μ e + e − is pre- sented using data collected by the NA48/2 experiment in 2003 and 2004. The measurement is performed in the region M ee > 140 MeV/c 2 [...]
SISSA, 2016 - 6 p. - Published in : PoS ICHEP2016 (2016) 636 Fulltext: PDF; External link: PoS server
In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.636
6.
First observation and study of $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay at the NA48/2 experiment / Misheva, M H (Dubna, JINR) ; Anzivino, G ; Arcidiacono, R ; Balev, S ; Batley, J R ; Behler, M ; Bi­fani, S ; Biino, C ; Bizzeti, A ; Bloch-Devaux, B et al.
A sample of almost 2000 $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ rare decays with a background contamination below 3% is observed for the first time by the NA48/2 experiment at CERN/SPS. The preliminary branching ratio in the full kinematic region is obtained to be $BR(K^\pm \to \pi^\pm \pi^0 e^+ e^-)$ = (4.06 ± 0.17) x $10^{-6}$ by analyzing the data set recorded in 3-month NA48/2 run during 2003. [...]
2015 - 4 p. - Published in : , pp. 237-240 Fulltext: PDF;
In : 50th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 21 - 28 Mar 2015, pp.237-240
7.
Searches for lepton number violation and resonances in $K^{\pm} \rightarrow \pi\mu\mu$ decays / NA48/2 Collaboration
The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003--2004. A new upper limit on the rate of the lepton number violating decay $K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm}$ is reported: $\mathcal{B}(K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm})<8.6 \times 10^{-11}$ at 90% CL. [...]
arXiv:1612.04723; CERN-EP-2016-310.- Geneva : CERN, 2017-06-10 - 10 p. - Published in : Phys. Lett. B 769 (2017) 67-76 Article from SCOAP3: PDF; Fulltext: arXiv:1612.04723 - PDF; fermilab-pub-16-700-td - PDF;
8.
Measurement of the $\pi^0$ electromagnetic transition form factor slope / NA62 Collaboration
The NA62 experiment collected a large sample of charged kaon decays in 2007 with a highly efficient trigger for decays into electrons. A measurement of the $\pi^{0}$ electromagnetic transition form factor slope parameter from $1.11\times10^{6}$ fully reconstructed $K^\pm \to \pi^\pm \pi^0_D, \; \pi^0_D \to e^+ e^- \, \gamma$ events is reported. [...]
arXiv:1612.08162; CERN-EP-2016-323.- Geneva : CERN, 2017-05-10 - 8 p. - Published in : Phys. Lett. B 768 (2017) 38-45 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2016-323 - PDF; arXiv:1612.08162 - PDF;
9.
ChPT tests at the NA48 and NA62 experiments at CERN / for the NA48/2 and NA62 Collaborations
The NA48/2 Collaboration at CERN has accumulated unprecedented statistics of rare kaon decays in the Ke4 modes: Ke4(+-) ($K^\pm \to \pi^+ \pi^- e^\pm \nu$) and Ke4(00) ($K^\pm \to \pi^0 \pi^0 e^\pm \nu$) with nearly one percent background contamination. The detailed study of form factors and branching rates, based on these data, has been completed recently. [...]
arXiv:1601.08014.- 2014 - 8 p. - Published in : PoS HQL2014 (2014) 022 Fulltext: pdf - PDF; arXiv:1601.08014 - PDF; Published version from PoS: PDF; External link: Preprint
In : XIIth International Conference on Heavy Quarks and Leptons 2014, Mainz, Germany, 25 - 29 Aug 2014, pp.022
10.
Search for the dark photon in $\pi^0$ decays / NA48/2 Collaboration
A sample of $1.69\times 10^7$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in $2003-2004$ is analysed to search for the dark photon ($A'$) production in the $\pi^0\to\gamma A'$ decay followed by the prompt $A'\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\varepsilon^2$ is established. [...]
arXiv:1504.00607; CERN-PH-EP-2015-093.- Geneva : CERN, 2015-05-05 - 8 p. - Published in : Phys. Lett. B 746 (2015) 178-185 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: arXiv:1504.00607 - PDF; CERN-PH-EP-2015-093 - PDF; External link: Preprint

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