Search for K+ decays to a muon and invisible particles

6533b7defe1ef96bd1276953

RESEARCH PRODUCT

Search for K+ decays to a muon and invisible particles

E Cortina Gil A Kleimenova E Minucci S Padolski P Petrov A Shaikhiev R Volpe T Numao Y Petrov B Velghe D Bryman J Fu T Husek J Jerhot K Kampf M Zamkovsky R Aliberti G Khoriauli J Kunze D Lomidze L Peruzzo M Vormstein R Wanke P Dalpiaz M Fiorini I Neri A Norton F Petrucci H Wahl A Cotta Ramusino A Gianoli E Iacopini G Latino M Lenti A Parenti A Bizzeti F Bucci A Antonelli G Georgiev V Kozhuharov G Lanfranchi S Martellotti M Moulson T Spadaro F Ambrosino T Capussela M Corvino D Difilippo P Massarotti M Mirra M Napolitano G Saracino G Anzivino F Brizioli E Imbergamo R Lollini R Piandani C Santoni M Barbanera P Cenci B Checcucci P Lubrano M Lupi M Pepe M Piccini F Costantini L Di Lella N Doble M Giorgi S Giudici G Lamanna E Lari E Pedreschi M Sozzi C Cerri R Fantechi L Pontisso F Spinella I Mannelli G D'agostini M Raggi A Biagioni E Leonardi A Lonardo P Valente P Vicini R Ammendola V Bonaiuto A Fucci A Salamon F Sargeni R Arcidiacono B Bloch-devaux M Boretto E Menichetti E Migliore D Soldi C Biino A Filippi F Marchetto J Engelfried N Estrada-tristan Am Bragadireanu Sa Ghinescu Oe Hutanu A Baeva D Baigarashev D Emelyanov T Enik V Falaleev V Kekelidze A Korotkova L Litov D Madigozhin M Misheva N Molokanova S Movchan I Polenkevich Yu Potrebenikov S Shkarovskiy A Zinchenko S Fedotov E Gushchin A Khotyantsev Y Kudenko V Kurochka M Medvedeva A Mefodev S Kholodenko V Kurshetsov V Obraztsov A Ostankov V Semenov V Sugonyaev O Yushchenko L Bician T Blazek V Cerny Z Kucerova J Bernhard A Ceccucci H Danielsson N De Simone F Duval B Dobrich L Federici E Gamberini L Gatignon R Guida F Hahn Eb Holzer B Jenninger M Koval P Laycock G Lehmann Miotto P Lichard A Mapelli R Marchevski K Massri M Noy V Palladino M Perrin-terrin J Pinzino V Ryjov S Schuchmann S Venditti T Bache Mb Brunetti V Duk V Fascianelli Jr Fry F Gonnella E Goudzovski J Henshaw L Iacobuzio C Lazzeroni N Lurkin F Newson C Parkinson A Romano A Sergi A Sturgess J Swallow H Heath R Page S Trilov B Angelucci D Britton C Graham D Protopopescu J Carmignani Jb Dainton Rwl Jones G Ruggiero L Fulton D Hutchcroft E Maurice B Wrona A Conovaloff P Cooper D Coward P Rubin Na62 Collaboration

subject

Nuclear and High Energy Physics Scalar (mathematics)FOS: Physical sciences 01 natural sciences 7. Clean energy NA62 High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex)0103 physical sciences heavy neutral leptons Dark sector NA62 physics beyond Standard Model 010306 general physics Physics Range (particle radiation)Muon kaon decays 010308 nuclear & particles physics Branching fraction Dark sector Settore FIS/04 Kaons lcsh:QC1-999 Hidden sector Particle High Energy Physics::Experiment Neutrino Particle Physics - Experiment lcsh:Physics Lepton

description

The NA62 experiment at CERN reports searches for $K^+\to\mu^+N$ and $K^+\to\mu^+\nu X$ decays, where $N$ and $X$ are massive invisible particles, using the 2016-2018 data set. The $N$ particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of ${\cal O}(10^{-8})$ of the neutrino mixing parameter $|U_{\mu4}|^2$ for $N$ masses in the range 200-384 MeV/$c^2$ and lifetime exceeding 50 ns. The $X$ particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for $X$ masses in the range 10-370 MeV/$c^2$ are reported for the first time, ranging from ${\cal O}(10^{-5})$ to ${\cal O}(10^{-7})$. An improved upper limit of $1.0\times 10^{-6}$ is established at 90% CL on the $K^+\to\mu^+\nu\nu\bar\nu$ branching fraction.

year	journal	country	edition	language
2021-01-01

10.1016/j.physletb.2021.136259 http://hdl.handle.net/2158/1243081