Springer : Measurement of the very rare K$^{+}$→$ {\pi}^{+}\nu \overline{\nu} $ decay

Cortina Gil, Eduardo; Kucerova, Zuzana; Romano, Angela; Khotyantsev, Alexey; Wahl, Heinrich; Sozzi, Marco; Piandani, Roberto; Conovaloff, Adam; Jones, Roger William Lewis; Spinella, Franco; Pedreschi, Elena; Engelfried, Jürgen; Numao, Toshio; Venditti, Stefano; Bernhard, Johannes; Duk, Viacheslav; Peruzzo, Letizia; Kunze, Jonas; Petrucci, Ferruccio; Bician, Lubos; Bizzeti, Andrea; Zamkovsky, Michal; Palladino, Vito; Lonardo, Alessandro; Latino, Giuseppe; De Simone, Nicola; Biino, Cristina; Molokanova, Natalia; Lupi, Matteo; Enik, Temur; Jerhot, Jan; Ammendola, Roberto; Gushchin, Evgeny; Pontisso, Luca; Soldi, Dario; Doble, Niels; Iacopini, Enrico; Massarotti, Paolo; Ruggiero, Giuseppe; Capussela, Tiziana; Zinchenko, Andrey; Fascianelli, Valeria; Yushchenko, Oleg; Fedotov, Sergei; Kozhuharov, Venelin; Page, Ryan; Dalpiaz, Pietro; Duval, Francois; Medvedeva, Mariia; Britton, David; Gianoli, Alberto; Maurice, Emilie; Danielsson, Hans; Biagioni, Andrea; Kampf, Karol; Di Filippo, Domenico; Falaleev, Valeri; Emelyanov, Dmitry; Hutchcroft, David; Marchevski, Radoslav; Imbergamo, Ermanno; Blazek, Tomas; Boretto, Marco; Cerri, Claudio; Goudzovski, Evgueni; Potrebenikov, Yu.; Baigarashev, Dosbol; Holzer, Eva Barbara; Ambrosino, Fabio; Di Lella, Luigi; Kekelidze, Vladimir; Newson, Francis; Piccini, Mauro; Wrona, Bozydar; Hutanu, Ovidiu Emanuel; Martellotti, Silvia; Ostankov, Aleksandr; Lazzeroni, Cristina; Cerny, Vladimir; Kudenko, Yury; Bloch-Devaux, Brigitte; Madigozhin, Dmitry; Baeva, Aigul; Brizioli, Francesco; Gonnella, Francesco; Anzivino, Giuseppina; Graham, Connor; Khoriauli, Gia; Giorgi, Marcello; Husek, Tomas; Volpe, Roberta; Bryman, Douglas; Santoni, Cristiano; Dainton, John Bourke; Shkarovskiy, Sergey; Georgiev, Georgi; Lanfranchi, Gaia; Migliore, Ernesto; Trilov, Stoyan; Cotta Ramusino, Angelo; Gamberini, Enrico; Marchetto, Flavio; Mapelli, Alessandro; Leonardi, Emanuele; Fu, Ji; Fiorini, Massimiliano; Ghinescu, Stefan Alexandru; Guida, Roberto; Angelucci, Bruno; Ceccucci, Augusto; Swallow, Joel; Lichard, Peter; Parkinson, Christopher; Neri, Ilaria; Saracino, Giulio; Pinzino, Jacopo; Lollini, Riccardo; Litov, Leandar; Gatignon, Lau; Korotkova, Anna; Misheva, Milena; Lamanna, Gianluca; Kleimenova, Alina; Mannelli, Italo; Cenci, Patrizia; Raggi, Mauro; Fry, John Richard; Vormstein, Mario; Valente, Paolo; Wanke, Rainer; Hahn, Ferdinand; Movchan, Sergei; Henshaw, Jack; Mefodev, Aleksandr; Bragadireanu, Alexandru Mario; Shaikhiev, Artur; Minucci, Elisa; Moulson, Matthew; Checcucci, Bruno; Lehmann Miotto, Giovanna; Döbrich, Babette; Lubrano, Pasquale; Norton, Alan; Kholodenko, Sergey; Potrebenikov, Yuri; Lari, Enrico; Petrov, Yevgeniy; Sargeni, Fausto; Polenkevich, Irina; Filippi, Alessandra; Obraztsov, Vladimir; Heath, Helen; Lurkin, Nicolas; Cooper, Peter; Estrada-Tristan, Nora; Padolski, Sergey; Antonelli, Antonella; Petrov, Plamen; Sergi, Antonino; Sugonyaev, Valentin; Brunetti, Maria Brigida; Federici, Luca; Semenov, Vitali; Perrin-Terrin, Mathieu; Iacobuzio, Lorenza; Corvino, Michele; Costantini, Flavio; Bucci, Francesca; Velghe, Bob; Noy, Matthew; Carmignani, Joseph; Kurshetsov, Viktor; Laycock, Paul; Mirra, Marco; Protopopescu, Dan; Salamon, Andrea; Lomidze, David; Kurochka, Viktoriia; Ryjov, Vladimir; Bonaiuto, Vincenzo; Pepe, Monica; Fantechi, Riccardo; Giudici, Sergio; Arcidiacono, Roberta; Fucci, Adolfo; Barbanera, Mattia; Sturgess, Andrew; Bache, Thomas; Fulton, Liam; Coward, David; Napolitano, Marco; Parenti, Andrea; Aliberti, Riccardo; Spadaro, Tommaso; Jenninger, Berthold; D'Agostini, Giulio; Schuchmann, Simone; Vicini, Piero; Lenti, Massimo; Koval, Michal; Massri, Karim; Rubin, Philip David; Menichetti, Ezio

doi:10.1007/JHEP06(2021)093

Article
Report number	arXiv:2103.15389
Title	Measurement of the very rare K $^{+}$ → ${\pi}^{+}\nu \overline{\nu}$ decay
Related title	Measurement of the very rare $K^+\rightarrow\pi^+\nu\bar{\nu}$ decay
Author(s)	Cortina Gil, Eduardo (Louvain U., CP3) ; Minucci, Elisa (Louvain U., CP3 ; CERN ; Frascati) ; Padolski, Sergey (Louvain U., CP3) ; Petrov, Plamen (Louvain U., CP3) ; Velghe, Bob (TRIUMF) ; Bryman, Douglas (British Columbia U. ; TRIUMF) ; Fu, Ji (British Columbia U.) ; Numao, Toshio (TRIUMF) ; Petrov, Yevgeniy (TRIUMF) ; Husek, Tomas (Charles U.) ; Kampf, Karol (Charles U.) ; Zamkovsky, Michal (Charles U.) ; Jerhot, Jan (Charles U. ; Louvain U., CP3) ; Aliberti, Riccardo (Mainz U., Inst. Phys.) ; Khoriauli, Gia (Mainz U., Inst. Phys.) ; Kunze, Jonas (Mainz U., Inst. Phys.) ; Lomidze, David (Mainz U., Inst. Phys.) ; Potrebenikov, Yu. (Dubna, JINR) ; Marchevski, Radoslav (CERN ; Mainz U., Inst. Phys.) ; Peruzzo, Letizia (Mainz U., Inst. Phys.) ; Vormstein, Mario (Mainz U., Inst. Phys.) ; Wanke, Rainer (Mainz U., Inst. Phys.) ; Cotta Ramusino, Angelo (INFN, Ferrara) ; Dalpiaz, Pietro (Ferrara U.) ; Fiorini, Massimiliano (Ferrara U.) ; Gamberini, Enrico (CERN) ; Gianoli, Alberto (INFN, Ferrara) ; Neri, Ilaria (Ferrara U.) ; Norton, Alan (Ferrara U. ; Glasgow U.) ; Petrucci, Ferruccio (Ferrara U.) ; Wahl, Heinrich (Ferrara U. ; Mainz U., Inst. Phys.) ; Bizzeti, Andrea (INFN, Florence) ; Bucci, Francesca (INFN, Florence) ; Iacopini, Enrico (Florence U.) ; Latino, Giuseppe (Florence U.) ; Lenti, Massimo (Florence U.) ; Parenti, Andrea (Florence U.) ; Volpe, Roberta (Louvain U., CP3 ; Comenius U.) ; Antonelli, Antonella (Frascati) ; Gonnella, Francesco (Birmingham U.) ; Lamanna, Gianluca (Pisa U.) ; Lanfranchi, Gaia (Frascati) ; Martellotti, Silvia (Frascati) ; Moulson, Matthew (Frascati) ; Kozhuharov, Venelin (Frascati) ; Litov, Leandar (Dubna, JINR) ; Georgiev, Georgi (Frascati) ; Raggi, Mauro (Rome U.) ; Spadaro, Tommaso (Frascati) ; Ambrosino, Fabio (Naples U.) ; Capussela, Tiziana (Naples U.) ; Corvino, Michele (Naples U. ; CERN) ; Di Filippo, Domenico (Naples U.) ; Massarotti, Paolo (Naples U.) ; Mirra, Marco (Naples U.) ; Napolitano, Marco (Naples U.) ; Saracino, Giulio (Naples U.) ; Anzivino, Giuseppina (Perugia U.) ; Imbergamo, Ermanno (Perugia U.) ; Lollini, Riccardo (Perugia U.) ; Santoni, Cristiano (Perugia U.) ; Brizioli, Francesco (Perugia U.) ; Barbanera, Mattia (INFN, Perugia) ; Cenci, Patrizia (INFN, Perugia) ; Checcucci, Bruno (INFN, Perugia) ; Duk, Viacheslav (Birmingham U. ; INFN, Perugia) ; Lupi, Matteo (INFN, Perugia) ; Pepe, Monica (INFN, Perugia) ; Piccini, Mauro (INFN, Perugia) ; Lubrano, Pasquale (INFN, Perugia) ; Costantini, Flavio (Pisa U.) ; Doble, Niels (Pisa U. ; Mainz U., Inst. Phys.) ; Giorgi, Marcello (Pisa U.) ; Giudici, Sergio (Pisa U.) ; Lari, Enrico (Pisa U.) ; Pinzino, Jacopo (CERN ; INFN, Pisa) ; Pontisso, Luca (INFN, Pisa) ; Sozzi, Marco (Pisa U.) ; Di Lella, Luigi (Pisa U. ; Mainz U., Inst. Phys.) ; Mannelli, Italo (Pisa, Scuola Normale Superiore) ; Cerri, Claudio (INFN, Pisa) ; Fantechi, Riccardo (INFN, Pisa) ; Pedreschi, Elena (Pisa U.) ; Piandani, Roberto (Perugia U.) ; Spinella, Franco (INFN, Pisa) ; Biagioni, Andrea (INFN, Rome) ; D'Agostini, Giulio (Rome U.) ; Leonardi, Emanuele (INFN, Rome) ; Lonardo, Alessandro (INFN, Rome) ; Valente, Paolo (INFN, Rome) ; Vicini, Piero (INFN, Rome) ; Ammendola, Roberto (Rome U., Tor Vergata) ; Bonaiuto, Vincenzo (Rome U., Tor Vergata) ; De Simone, Nicola (CERN) ; Federici, Luca (CERN) ; Fucci, Adolfo (Rome U., Tor Vergata) ; Salamon, Andrea (Rome U., Tor Vergata) ; Sargeni, Fausto (Rome U., Tor Vergata) ; Arcidiacono, Roberta (Turin U.) ; Biino, Cristina (INFN, Turin) ; Bloch-Devaux, Brigitte (Turin U.) ; Boretto, Marco (Turin U. ; CERN) ; Filippi, Alessandra (INFN, Turin) ; Iacobuzio, Lorenza (Birmingham U.) ; Marchetto, Flavio (INFN, Turin) ; Menichetti, Ezio (Turin U.) ; Migliore, Ernesto (Turin U.) ; Soldi, Dario (Turin U.) ; Engelfried, Jürgen (San Luis Potosi U.) ; Estrada-Tristan, Nora (San Luis Potosi U.) ; Bragadireanu, Alexandru Mario (Bucharest, IFIN-HH) ; Ghinescu, Stefan Alexandru (Bucharest, IFIN-HH) ; Hutanu, Ovidiu Emanuel (Bucharest, IFIN-HH) ; Enik, Temur (Dubna, JINR) ; Falaleev, Valeri (Dubna, JINR) ; Kekelidze, Vladimir (Dubna, JINR) ; Korotkova, Anna (Dubna, JINR) ; Madigozhin, Dmitry (Dubna, JINR) ; Misheva, Milena (Dubna, JINR) ; Molokanova, Natalia (Dubna, JINR) ; Movchan, Sergei (Dubna, JINR) ; Polenkevich, Irina (Dubna, JINR) ; Potrebenikov, Yuri (Dubna, JINR) ; Shkarovskiy, Sergey (Dubna, JINR) ; Zinchenko, Andrey (Dubna, JINR) ; Baeva, Aigul (Dubna, JINR) ; Baigarashev, Dosbol (Dubna, JINR) ; Emelyanov, Dmitry (Dubna, JINR) ; Fedotov, Sergei (Moscow, INR) ; Khotyantsev, Alexey (Moscow, INR) ; Gushchin, Evgeny (Moscow, INR) ; Kleimenova, Alina (Louvain U., CP3) ; Kudenko, Yury (Moscow, INR) ; Kurochka, Viktoriia (Moscow, INR) ; Medvedeva, Mariia (Moscow, INR) ; Mefodev, Aleksandr (Moscow, INR) ; Shaikhiev, Artur (Louvain U., CP3 ; Moscow, INR) ; Kholodenko, Sergey (Serpukhov, IHEP) ; Kurshetsov, Viktor (Serpukhov, IHEP) ; Obraztsov, Vladimir (Serpukhov, IHEP) ; Ostankov, Aleksandr (Serpukhov, IHEP) ; Semenov, Vitali (Serpukhov, IHEP) ; Sugonyaev, Valentin (Serpukhov, IHEP) ; Yushchenko, Oleg (Serpukhov, IHEP) ; Bician, Lubos (Comenius U. ; CERN) ; Blazek, Tomas (Comenius U.) ; Cerny, Vladimir (Comenius U.) ; Koval, Michal (CERN ; Charles U.) ; Kucerova, Zuzana (Comenius U.) ; Ceccucci, Augusto (CERN) ; Bernhard, Johannes (CERN) ; Danielsson, Hans (CERN) ; Döbrich, Babette (CERN) ; Duval, Francois (CERN) ; Gatignon, Lau (CERN ; Lancaster U.) ; Guida, Roberto (CERN) ; Hahn, Ferdinand (CERN) ; Holzer, Eva Barbara (CERN) ; Jenninger, Berthold (CERN) ; Laycock, Paul (CERN) ; Lehmann Miotto, Giovanna (CERN) ; Lichard, Peter (CERN) ; Mapelli, Alessandro (CERN) ; Noy, Matthew (CERN) ; Palladino, Vito (CERN) ; Perrin-Terrin, Mathieu (CERN ; Louvain U., CP3) ; Ruggiero, Giuseppe (Lancaster U. ; Florence U.) ; Ryjov, Vladimir (CERN) ; Schuchmann, Simone (CERN ; Mainz U., Inst. Phys.) ; Venditti, Stefano (CERN) ; Brunetti, Maria Brigida (Birmingham U.) ; Bache, Thomas (Birmingham U.) ; Goudzovski, Evgueni (Birmingham U.) ; Henshaw, Jack (Birmingham U.) ; Lazzeroni, Cristina (Birmingham U.) ; Fascianelli, Valeria (Birmingham U.) ; Lurkin, Nicolas (Birmingham U. ; Louvain U., CP3) ; Newson, Francis (Birmingham U.) ; Parkinson, Christopher (Birmingham U. ; Louvain U., CP3) ; Romano, Angela (Birmingham U.) ; Sergi, Antonino (Birmingham U.) ; Sturgess, Andrew (Birmingham U.) ; Swallow, Joel (Birmingham U.) ; Heath, Helen (Bristol U.) ; Page, Ryan (Bristol U.) ; Trilov, Stoyan (Bristol U.) ; Angelucci, Bruno (Glasgow U.) ; Britton, David (Glasgow U.) ; Protopopescu, Dan (Glasgow U.) ; Graham, Connor (Glasgow U.) ; Jones, Roger William Lewis (Lancaster U.) ; Dainton, John Bourke (Lancaster U.) ; Fry, John Richard (Birmingham U.) ; Fulton, Liam (Liverpool U.) ; Hutchcroft, David (Liverpool U.) ; Carmignani, Joseph (Lancaster U.) ; Massri, Karim (CERN) ; Maurice, Emilie (Liverpool U.) ; Wrona, Bozydar (Liverpool U.) ; Conovaloff, Adam (George Mason U.) ; Cooper, Peter (George Mason U.) ; Coward, David (George Mason U.) ; Rubin, Philip David (George Mason U.) NA62 Collaboration Vis alle 203 forfattere
Publication	2021-06-15
Imprint	2021-03-29
Number of pages	22
In:	JHEP 2106 (2021) 093
DOI	10.1007/JHEP06(2021)093
Subject category	hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA62
Abstract	The NA62 experiment reports the branching ratio measurement BR $(K^+ \rightarrow \pi^+ \nu\bar{\nu}) = (10.6^{+4.0}_{-3.4} \|_{\rm stat} \pm 0.9_{\rm syst}) \times 10 ^{-11}$ 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 $K^+ \rightarrow \pi^+ \nu\bar{\nu}$ decay, observed with a significance of 3.4 $\sigma$ . The experiment achieves a single event sensitivity of $(0.839\pm 0.054)\times 10^{-11}$ , corresponding to 10.0 events assuming the Standard Model branching ratio of $(8.4\pm1.0)\times10^{-11}$ . This measurement is also used to set limits on BR( $K^+ \to \pi^+ X$ ), where $X$ is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.
Copyright/License	preprint: (License: CC-BY-4.0) publication: © 2021-2025 CERN (License: CC-BY-4.0), sponsored by SCOAP³

$Reconstructed $m^2_{\textrm{miss}}$ as a function of $p_{\pi^+}$ for minimum-bias events selected without applying $\pi^+$ identification and photon rejection, assuming the $K^+$ and $\pi^+$ mass for the parent and decay particle, respectively. Signal regions 1 and 2 (hatched areas), as well as $3\pi$, $\pi^+\pi^0$, and $\mu\nu$ background regions (solid thick contours) are shown. The control regions are located between the signal and background regions.$ $Evaluation of the $\pi^+\pi^0$ background. \textbf{Left:} Distribution in the ($p_\pi^+$, $m^2_{\textrm{miss}}$) plane of events in the $\pi^+\pi^0$ region and in the adjacent control regions after the complete signal selection is applied to the S1 and S2 subsets. The intensity of the grey shaded area reflects the variation of the SM signal acceptance in the plane. \textbf{Right:} Data/MC comparison of the $m^2_{\textrm{miss}}$ distribution of minimum-bias \pp~events selected by tagging the $\pi^0\rightarrow \gamma\gamma$ decay. This data sample is used to measure the \pp~kinematic factor $f_{\rm kin}$.$ Show more plots

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