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.

An investigation of the very rare K+→ π+νν¯ decay

Arcidiacono R.;Boretto M.;Menichetti E.;Migliore E.;Soldi D.;
2020

Abstract

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.
2020
11
1
57
Fixed target experiments; Flavor physics; Flavour Changing Neutral Currents; Rare decay
Cortina Gil E.; Kleimenova A.; Minucci E.; Padolski S.; Petrov P.; Shaikhiev A.; Volpe R.; Numao T.; Velghe B.; Bryman D.; Fu J.; Husek T.; Jerhot J.; Kampf K.; Zamkovsky M.; Aliberti R.; Khoriauli G.; Kunze J.; Lomidze D.; Marchevski R.; Peruzzo L.; Vormstein M.; Wanke R.; Dalpiaz P.; Fiorini M.; Neri I.; Norton A.; Petrucci F.; Wahl H.; Cotta Ramusino A.; Gianoli A.; Iacopini E.; Latino G.; Lenti M.; Parenti A.; Bizzeti A.; Bucci F.; Antonelli A.; Georgiev G.; Kozhuharov V.; Lanfranchi G.; Martellotti S.; Moulson M.; Spadaro T.; Ambrosino F.; Capussela T.; Corvino M.; Di Filippo D.; Massarotti P.; Mirra M.; Napolitano M.; Saracino G.; Anzivino G.; Brizioli F.; Imbergamo E.; Lollini R.; Piandani R.; Santoni C.; Barbanera M.; Cenci P.; Checcucci B.; Lubrano P.; Lupi M.; Pepe M.; Piccini M.; Costantini F.; Di Lella L.; Doble N.; Giorgi M.; Giudici S.; Lamanna G.; Lari E.; Pedreschi E.; Sozzi M.; Cerri C.; Fantechi R.; Pontisso L.; Spinella F.; Mannelli I.; D'Agostini G.; Raggi M.; Biagioni A.; Leonardi E.; Lonardo A.; Valente P.; Vicini P.; Ammendola R.; Bonaiuto V.; Fucci A.; Salamon A.; Sargeni F.; Arcidiacono R.; Bloch-Devaux B.; Boretto M.; Menichetti E.; Migliore E.; Soldi D.; Biino C.; Filippi A.; Marchetto F.; Engelfried J.; Estrada-Tristan N.; Bragadireanu A.M.; Ghinescu S.A.; Hutanu O.E.; Baeva A.; Baigarashev D.; Emelyanov D.; Enik T.; Falaleev V.; Kekelidze V.; Korotkova A.; Litov L.; Madigozhin D.; Misheva M.; Molokanova N.; Movchan S.; Polenkevich I.; Potrebenikov Y.; Shkarovskiy S.; Zinchenko A.; Fedotov S.; Gushchin E.; Khotyantsev A.; Kudenko Y.; Kurochka V.; Medvedeva M.; Mefodev A.; Kholodenko S.; Kurshetsov V.; Obraztsov V.; Ostankov A.; Semenov V.; Sugonyaev V.; Yushchenko O.; Bician L.; Blazek T.; Cerny V.; Kucerova Z.; Bernhard J.; Ceccucci A.; Danielsson H.; De Simone N.; Duval F.; Dobrich B.; Federici L.; Gamberini E.; Gatignon L.; Guida R.; Hahn F.; Holzer E.B.; Jenninger B.; Koval M.; Laycock P.; Lehmann Miotto G.; Lichard P.; Mapelli A.; Massri K.; Noy M.; Palladino V.; Perrin-Terrin M.; Pinzino J.; Ryjov V.; Schuchmann S.; Venditti S.; Bache T.; Brunetti M.B.; Duk V.; Fascianelli V.; Fry J.R.; Gonnella F.; Goudzovski E.; Iacobuzio L.; Lazzeroni C.; Lurkin N.; Newson F.; Parkinson C.; Romano A.; Sergi A.; Sturgess A.; Swallow J.; Heath H.; Page R.; Trilov S.; Angelucci B.; Britton D.; Graham C.; Protopopescu D.; Carmignani J.; Dainton J.B.; Jones R.W.L.; Ruggiero G.; Fulton L.; Hutchcroft D.; Maurice E.; Wrona B.; Conovaloff A.; Cooper P.; Coward D.; Rubin P.
File in questo prodotto:
File Dimensione Formato  
jhep_11_2020_042.pdf

Accesso aperto

Descrizione: Articolo principale
Tipo di file: PDF EDITORIALE
Dimensione 4.64 MB
Formato Adobe PDF
4.64 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1772437
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 36
  • ???jsp.display-item.citation.isi??? 10
social impact