Publication: An investigation of the very rare K+→ π+νν¯ decay
Дата
2020
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Аннотация
© 2020, The Author(s).The NA62 experiment reports an investigation of the K+→ π+νν¯ mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+→ π+νν¯ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48−0.48+0.72) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.
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An investigation of the very rare K+→ π+νν¯ decay / Cortina, Gil, E. [et al.] // Journal of High Energy Physics. - 2020. - 2020. - № 11. - 10.1007/JHEP11(2020)042
URI
https://www.doi.org/10.1007/JHEP11(2020)042
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https://www.scopus.com/record/display.uri?eid=2-s2.0-85095810590&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000593745600001
https://openrepository.mephi.ru/handle/123456789/22584