CERN Accelerating science

CERN Document Server 23 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 1.38 секунд. 
1.
First search for K+π0πμeK+π0πμe decays / NA62 Collaboration
The first search for the lepton number violating decay K+π0πμ+e+K+π0πμ+e+ and lepton flavour violating decays K+π0π+μe+, K+π0π+μ+e has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 2.9×1010, 3.1×1010 and 5.0×1010, 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;
2.
Measurement of the K+π+γγ decay / NA62 Collaboration
A sample of 3984 candidates of the K+π+γγ decay, with an estimated background of 291±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: CERN-EP-2023-247 - PDF; 2311.01837 - PDF; Publication - PDF;
3.
Search for K+ decays into the π+e+ee+e final state / NA62 Collaboration
The first search for ultra-rare K+ decays into the π+e+ee+e final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017-2018. An upper limit of 1.4×108 at 90% CL is obtained for the branching ratio of the K+π+e+ee+e decay, predicted in the Standard Model to be (7.2±0.7)×1011. [...]
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;
4.
A study of the K+π0e+νγ decay / NA62 Collaboration
A sample of 1.3×105K+π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. [...]
arXiv:2304.12271; CERN-EP-2023-069.- Geneva : CERN, 2023-09-07 - 16 p. - Published in : JHEP 2309 (2023) 040 Draft (restricted): PDF; Fulltext: CERN-EP-2023-069 - PDF; 2304.12271 - PDF; document - PDF;
5.
A search for the K+μνe+e+ decay / NA62 Collaboration
A search for the K+μνe+e+ decay forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1×1011 is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search..
arXiv:2211.04818; CERN-EP-2022-243.- Geneva : CERN, 2023-03-10 - 12 p. - Published in : Phys. Lett. B 838 (2023) 137679 Draft (restricted): PDF; Fulltext: 2211.04818 - PDF; Publication - PDF; CERN-EP-2022-243 - PDF;
6.
Improved calorimetric particle identification in NA62 using machine learning techniques / NA62 Collaboration
Measurement of the ultra-rare K+π+νˉν decay at the NA62 experiment at CERN requires high-performance particle identification to distinguish muons from pions. Calorimetric identification currently in use, based on a boosted decision tree algorithm, achieves a muon misidentification probability of 1.2×105 for a pion identification efficiency of 75% in the momentum range of 1540 GeV/c. [...]
arXiv:2304.10580; CERN-EP-2023-066.- Geneva : CERN, 2023-11-21 - 13 p. - Published in : JHEP 2311 (2023) 138 Draft (restricted): PDF; Fulltext: 2304.10580 - PDF; document - PDF; CERN-EP-2023-066 - PDF;
7.
A measurement of the K+π+μ+μ decay / NA62 Collaboration
A sample of 2.8×104 K+π+μ+μ candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017-2018. The model-independent branching fraction is measured to be (9.15±0.08)×108, a factor three more precise than previous measurements. [...]
arXiv:2209.05076; CERN-EP-2022-189.- Geneva : CERN, 2022-11-04 - 19 p.
Draft (restricted): PDF; Fulltext: CERN-EP-2022-189 - PDF; document - PDF; 2209.05076 - PDF; Publication - PDF;
8.
Performance of the NA62 trigger system / NA62 Collaboration
The NA62 experiment at CERN targets the measurement of the ultra-rare K+π+νˉν decay, and carries out a broad physics programme that includes probes for symmetry violations and searches for exotic particles. Data were collected in 2016–2018 using a multi-level trigger system, which is described highlighting performance studies based on 2018 data..
arXiv:2208.00897; CERN-EP-2022-165.- Geneva : CERN, 2023-03-17 - 20 p. - Published in : JHEP 2303 (2023) 122 Draft (restricted): PDF; Fulltext: CERN-EP-2022-165 - PDF; document - PDF; 2208.00897 - PDF;
9.
Searches for lepton number violating K+π(π0)e+e+ decays / NA62 Collaboration
Searches for lepton number violating K+πe+e+ and K+ππ0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of 5.3×1011 and 8.5×1010 are obtained on the decay branching fractions at 90% confidence level. [...]
arXiv:2202.00331; CERN-EP-2022-018.- 2022-07-10 - 16 p. Draft (restricted): PDF; Fulltext: 2202.00331 - PDF; CERN-EP-2022-018 - PDF;
10.
Measurement of the very rare K+π+ν¯ν decay / NA62 Collaboration
The NA62 experiment reports the branching ratio measurement BR(K+π+νˉν)=(10.6+4.03.4|stat±0.9syst)×1011 at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016-2018. This provides evidence for the very rare K+π+νˉν decay, observed with a significance of 3.4σ. [...]
arXiv:2103.15389.- 2021-06-15 - 22 p. - Published in : JHEP 2106 (2021) 093 Article from SCOAP3: PDF; Fulltext: PDF;

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