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CERN Document Server 13 records found  1 - 10próximo  jump to record: Search took 0.70 seconds. 
1.
First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay based on a sample of 2437 candidates with 15% background contamination collected in 2003-2004. The decay branching ratio in the kinematic region of the squared dilepton mass above $0.03$~GeV$^2/c^4$ is measured to be $(0.65 \pm 0.03) \times 10^{-6}$. [...]
arXiv:2310.20295; CERN-EP-2023-245.- Geneva : CERN, 2024-03-22 - 16 p. - Published in : JHEP 2403 (2024) 137 Draft (restricted): PDF; Fulltext: 2310.20295 - PDF; CERN-EP-2023-245 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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2.
Measurement of the form factors of charged kaon semileptonic decays / NA48/2 Collaboration
A measurement of the form factors of charged kaon semileptonic decays is presented, based on $4.4 \times 10^{6}$ $K^\pm \to \pi^0 e^\pm \nu_e$ ($K^\pm_{e3}$) and $2.3 \times 10^{6}$ $K^\pm \to \pi^0 \mu^\pm \nu_\mu$ ($K^\pm_{\mu3}$) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. [...]
arXiv:1808.09041; CERN-EP-2018-231.- Geneva : CERN, 2018-10-24 - 20 p. - Published in : JHEP 10 (2018) 150 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Draft (restricted): PDF; Fulltext: fermilab-pub-18-701 - PDF; CERN-EP-2018-231 - PDF; 1808.09041 - PDF;
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3.
Search for heavy neutrinos in $K^+ \rightarrow \mu^+ \nu_{\mu}$ decays / Lazzeroni, Cristina (Birmingham U.) ; Lurkin, Nicolas (Birmingham U.) ; Newson, Francis (Birmingham U.) ; Romano, Angela (Birmingham U.) ; Ceccucci, Augusto (CERN) ; Danielsson, Hans (CERN) ; Falaleev, Valeri (CERN) ; Gatignon, Lau (CERN) ; Goy Lopez, Silvia (CERN) ; Hallgren, Bjorn (CERN) et al.
The NA62 experiment recorded a large sample of $K^+ \rightarrow \mu^+ \nu_{\mu}$ decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. [...]
arXiv:1705.07510; CERN-EP-2017-114.- Geneva : CERN, 2017-09-10 - 7 p. - Published in : Phys. Lett. B 772 (2017) 712-718 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: arXiv:1705.07510 - PDF; CERN-EP-2017-114 - PDF;
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4.
The beam and detector of the NA62 experiment at CERN / NA62 Collaboration
NA62 is a fixed-target experiment at the CERN SPS dedicated to measurements of rare kaon decays. Such measurements, like the branching fraction of the $K^{+} \rightarrow \pi^{+} \nu \bar\nu$ decay, have the potential to bring significant insights into new physics processes when comparison is made with precise theoretical predictions. [...]
arXiv:1703.08501.- 2017-05-31 - 121 p. - Published in : JINST 12 (2017) P05025 Fulltext: arXiv:1703.08501 - PDF; 10.1088_1748-0221_12_05_P05025 - PDF; IOP OA article: PDF;
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5.
Tests of Chiral Perturbation Theory with $K_{e4}$ decays at CERN NA48/2 experiment / Balev, Spasimir (CERN) ; Bloch-Devaux, Brigitte (Turin U.) /NA48/2
The NA48/2 collaboration has accumulated the largest sampl es to date of semi-leptonic charged kaon decays in the K + − e4 (K ± → π + π − e ± ν ) and K 00 e4 ( K ± → π 0 π 0 e ± ν ) modes. From 1.1 million K + − e4 decays, form factors in the S- and P-wave have been extensive ly studied [...]
2014 - 3 p. - Published in : PoS EPS-HEP2013 (2013) 133 Fulltext: PDF; External link: POS
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013, pp.133
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6.
Поиск прямого СР-нарушения в $K^{\pm} \rightarrow \pi^{\pm}\pi^{0}\pi^{0}$ распады в эксперименте NA-48/2 / Balev, Spasimir
CERN-THESIS-2007-148 - 155 p.

Fulltext - Full text
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7.
New results on $K$ physics from NA48 and NA62 experiments / Balev, Spasimir (CERN)
2012 - Published in : Nuovo Cimento C: 35 (2012) , no. 1, pp. 257-264

In : 25ème Rencontres de Physique de La Vallée d'Aoste, La Thuile, Italy, 27 Feb - 5 Mar 2011, pp.257-264
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8.
Searches for new physics at the NA62 experiment / Balev, Spasimir (CERN)
2010 - 6 p.

In : 16th International Symposium on Particles, Strings and Cosmology, Valencia, Spain, 19 - 23 Jul 2010, pp.012023
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9.
Lepton universality test with Kl2 decays at NA62 experiment / Balev, Spasimir (Pisa, Scuola Normale Superiore ; INFN, Pisa)
The experiment NA62 at CERN collected a large sample of K+- leptonic decays in order to perform precise test of lepton universality, by measuring the helicity suppressed ratio R_K=Gamma(K+- --> e+- nu)/Gamma(K+- --> mu+- nu). [...]
arXiv:1006.1201. - 2010. - 4 p.
Preprint - Full text
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10.
Tests of chiral perturbation theory with $K_{e4}$ decays at NA48/2 / Balev, Spasimir (Pisa, Scuola Normale Superiore ; INFN, Pisa)
The experiment NA48/2 at CERN SPS performed high precision measurement of the form factors of $K^{\pm} \rightarrow \pi^{+}\pi^{-}e^{\pm}\nu$ decays and s-wave $\pi \pi$ scattering lengths $a_{0}$ and $a_{2}$ for isospin 0 and 2, respectively. The preliminary result on the full available statistics of more than 1 million $K^{\pm}_{e4}$ decays achieves a precision similar to the theoretical one and provides excellent test of Chiral Perturbation Theory..
2009 - Published in : Acta Phys. Pol. B Proc. Suppl.: 2 (2009) , pp. 385
In : International Meeting on Excited QCD, Zakopane, Poland, 08 - 14 Feb 2009, pp.385-390
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Veja também: nomes de autores similares
15 Balev, S
26 Balev, S.
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