An investigation of the very rare $K^+\rightarrowπ^+ν\barν$ decay
- Publikationstyp:
- Zeitschriftenaufsatz
- Metadaten:
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- Abstract
- The NA62 experiment reports an investigation of the $K^+\rightarrow\pi^+\nu\bar{\nu}$ mode from a sample of $K^+$ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of $(0.389\pm 0.024)\times10^{-10}$, corresponding to 2.2 events assuming the Standard Model branching ratio of $(8.4\pm1.0)\times10^{-11}$. 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 $1.78\times10^{-10}$ for the $K^+\rightarrow\pi^+\nu\bar{\nu}$ branching ratio at 90\%\,CL. This, together with the corresponding 68\%\,CL measurement of $(0.48^{+0.72 }_{-0.48})\times10^{-10}$, 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.
- Autoren
- NA62 Collaboration
- Autoren-URL
- http://arxiv.org/abs/2007.08218v2
- Schlüsselwörter
- hep-ex
- hep-ex
- Datum der Veröffentlichung
- 2020
- Herausgeber URL
- http://dx.doi.org/10.1007/JHEP11(2020)042
- Datum der Datenerfassung
- 2020
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2020
- Titel
- An investigation of the very rare $K^+\rightarrowπ^+ν\barν$ decay
Files
2007.08218v2.pdf
Datenquelle: arXiv
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