Search for heavy neutral lepton production in K+ decays to positrons

Gil, E. Cortina; Kleimenova, A.; Minucci, E.; Padolski, S.; Petrov, P.; Shaikhiev, A.; Volpe, R.; Numao, T.; Petrov, Y.; Velghe, B.; Bryman, D.; Fu, J.; Husek, T.; Jerhot, Jan; Kampf, Karol; Zamkovsky, M.; Aliberti, R.; Khoriauli, G.; Kunze, J.; Lomidze, D.; Peruzzo, L.; Vormstein, M.; Wanke, R.; Dalpiaz, P.; Fiorini, M.; Neri, Ilaria; Norton, A.; Petrucci, F.; Wahl, H.; Ramusino, A. Cotta; 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.; Filippo, D. Di; Massarotti, P.; Mirra, M.; Napolitano, M.; Saracino, G.; Anzivino, G.; Brizioli, Francesco; Imbergamo, E.; Lollini, R.; Piandani, R.; Santoni, C.; Barbanera, M.; Cenci, P.; Checcucci, B.; Lubrano, P.; Lupi, M.; Pepé, M.; Piccini, M.; Costantini, F.; Lella, L. Di; Doble, N.; Giorgi, M. A.; Giudici, S.; Lamanna, G.; Lari, Enrico; 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, Roberto; 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, Stefan Alexandru; Hutanu, Ovidiu Emanuel; Baeva, Aigul; Baigarashev, Dosbol; Emelyanov, D.; Enik, T.; Falaleev, V.; Kekelidze, V.; Korotkova, A.; Litov, L.; Madigozhin, D.; Misheva, M.; Molokanova, N.; Movchan, S.; Polenkevich, I.; Potrebenikov, Yu.; 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.P.; Yushchenko, O.; Bician, L.; Blažek, T.; Černý, V.; Kučerová, Z.; Bernhard, J.; Ceccucci, A.; Danielsson, H. O.; Simone, N. De; Duval, F.; Döbrich, Babette; Federici, L.; Gamberini, E.; Gatignon, L.; Guida, R.; Hahn, F.; Holzer, E. B.; Jenninger, B.; Koval, M.; Laycock, P.; Miotto, G. Lehmann; Lichard, P.; Mapelli, A.; Marchevski, R.; Massri, Karim; Noy, M.; Palladino, V.; Perrin-Terrin, M.; Pinzino, J.; Ryjov, V.; Schuchmann, S.; Venditti, S.; Bache, T.; Brunetti, Maria Brigida; Duk, V.; Fascianelli, V.; Fry, J. R.; Gonnella, F.; Goudzovski, E.; Henshaw, Jack; Iacobuzio, L.; Lazzeroni, C.; Lurkin, N.; Newson, F.; Parkinson, C. J.; Romano, A.; Sergi, A.; Sturgess, A.; Swallow, Joel; Heath, H. F.; Page, Ryan; Trilov, Stoyan Miroslavov; Angelucci, B.; Britton, D.; Graham, C.; Protopopescu, D.; Carmignani, Joseph; Dainton, J. B.; Jones, R. W. L.; Ruggiero, G.; Fulton, L.; Hutchcroft, D.; Maurice, E.; Wrona, B.; Conovaloff, A.; Cooper, P. S.; Coward, D.; Rubin, P.

doi:10.1016/j.physletb.2020.135599

Cited by 77 publications

(70 citation statements)

References 15 publications

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“…• If HNLs are sufficiently light (below the electroweak scale), their existence can be probed directly . A partial list of the searches at the existing experiments is [57][58][59][60][61][62][63][64][65][66][67][68][69]. HNL searches are an important part of the physics program of many proposed experiments, see, e.g.…”

Section: Jhep07(2021)193mentioning

confidence: 99%

“…In addition, they are not sensitive to combinations U α U β (α = β) and cannot constrain U 2 τ (because of large tau-lepton JHEP07(2021)193 mass m τ > m K ). We use explicit bounds from: PIENU [121], TRIUMPH [122] (π → e), KEK [123], NA62 [66,67] (K → e/µ), E949 [58] (K → µ). For NA62 K → µ decay only 30% of the current data has been processed [67].…”

Section: Constraints From Accelerator Experimentsmentioning

confidence: 99%

“…To estimate the future sensitivity of the NA62 experiment, we assume that the experiment will collect 8 times more data than has been published. 6 Assuming that both JHEP07(2021)193 data collection and analysis strategy will not significantly change in the future and that no HNLs will be detected, the current limit can be scaled down as √ 8, taking into account that the HNL analysis is background dominated [66]. We see that for the normal hierarchy future NA62 measurement will not explore the HNL mass "window" beyond the pion mass.…”

Section: Future Searchesmentioning

confidence: 99%

“…Indeed, the goal of NA62 is to collect 80 rare kaon decay K + → π + νν events[152]. The existing HNL constraint[66] are based on the dataset where only 9.5 rare kaon events are expected[153].…”

mentioning

confidence: 99%

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An allowed window for heavy neutral leptons below the kaon mass

Bondarenko

Boyarsky

Klarić

et al. 2021

J. High Energ. Phys.

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The extension of the Standard Model with two gauge-singlet Majorana fermions can simultaneously explain two beyond-the-Standard-model phenomena: neutrino masses and oscillations, as well as the origin of the matter-antimatter asymmetry in the Universe. The parameters of such a model are constrained by the neutrino oscillation data, direct accelerator searches, big bang nucleosynthesis, and requirement of successful baryogenesis. We show that their combination still leaves an allowed region in the parameter space below the kaon mass. This region can be probed by the further searches of NA62, DUNE, or SHiP experiments.

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Section: Jhep07(2021)193mentioning

confidence: 99%

Section: Constraints From Accelerator Experimentsmentioning

confidence: 99%

Section: Future Searchesmentioning

confidence: 99%

mentioning

confidence: 99%

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An allowed window for heavy neutral leptons below the kaon mass

Bondarenko

Boyarsky

Klarić

et al. 2021

J. High Energ. Phys.

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show abstract

“…[74] experiment searched for long-lived HNL decays from a high intensity beam dump with 1.74 × 10 18 Proton-on-Target (PoT). It is sensitive to HNLs produced in kaon decays, leading to the limits shown as the lower red curves in figure 7. we show the projected reach of future experiments.…”

mentioning

confidence: 99%

Neutrino masses from low scale partial compositeness

Chacko

Fox

Harnik

et al. 2021

J. High Energ. Phys.

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We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sector. In this framework, the light neutrinos are partially composite particles that obtain their masses through the inverse seesaw mechanism. We focus on the scenario in which the strong dynamics is approximately conformal in the ultraviolet, and the compositeness scale lies at or below the weak scale. The small parameters in the Lagrangian necessary to realize the observed neutrino masses can naturally arise as a consequence of the scaling dimensions of operators in the conformal field theory. We show that this class of models has interesting implications for a wide variety of experiments, including colliders and beam dumps, searches for lepton flavor violation and neutrinoless double beta decay, and cosmological observations. At colliders and beam dumps, this scenario can give rise to striking signals involving multiple displaced vertices. The exchange of hidden sector states can lead to observable rates for flavor violating processes such as μ → eγ and μ → e conversion. If the compositeness scale lies at or below a hundred MeV, the rate for neutrinoless double beta decay is suppressed by form factors and may be reduced by an order of magnitude or more. The late decays of relic singlet neutrinos can give rise to spectral distortions in the cosmic microwave background that are large enough to be observed in future experiments.

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Probing HNL‐ALP Couplings at Colliders

Giorgi

Merlo

Tastet

2023

Fortschritte der Physik

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Axion‐like particles (ALPs) and heavy neutral leptons (HNLs) are both well‐motivated extensions of the Standard Model. As ALPs couple to on‐shell fermions proportionally to their masses, processes involving both types of particles may give rise, for TeV HNLs, to relevant phenomenology at colliders. In this work, we point out a particularly clean process, whose final state consists of four jets and two charged leptons, and we estimate its current and future sensitivity at the LHC. For on‐shell HNLs, i) there is no dependence on the overall scale of the mixing between HNLs and the active neutrinos, making this process sensitive down to the type‐I Seesaw line; ii) the signal strength of the process is sizable only as far as the HNL masses are below a few TeVs, contrary to what the proportionality to masses of the ALP couplings may suggest. Although ALPs and HNLs have been mainly studied independently in the literature, considering their interplay may lead to joint limits that are much stronger than those on the individual particles taken separately. This concise study paves the way for similar searches at colliders and other experiments.

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Search for heavy neutral lepton production in K+ decays to positrons

Cited by 77 publications

References 15 publications

An allowed window for heavy neutral leptons below the kaon mass

An allowed window for heavy neutral leptons below the kaon mass

Neutrino masses from low scale partial compositeness

Probing HNL‐ALP Couplings at Colliders

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