New limits on heavy sterile neutrino mixing in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts /><mml:none /><mml:mn>8</mml:mn></mml:mmultiscripts></mml:math>decay obtained with the Borexino detector

Bellini, G.; Benziger, J.; Bick, D.; Bonfini, G.; Bravo, D.; Avanzini, M. Buizza; Caccianiga, B.; Cadonati, L.; Calaprice, F.; Cavalcante, P.; Chavarría, Á.; Chepurnov, A.; D’Angelo, D.; Davini, S.; Derbin, A.; Drachnev, I.; Empl, A.; Etenko, A.; Fomenko, K.; Franco, D.; Galbiati, C.; Gazzana, S.; Ghiano, C.; Giammarchi, M.; Göger‐Neff, M.; Goretti, A.; Grandi, L.; Hagner, C.; Hungerford, E.; Ianni, Aldo; Ianni, Andrea; Kobychev, V.; Korablëv, D.; Korga, G.; Kryn, D.; Laubenstein, M.; Lewke, T.; Litvinovich, E.; Loer, B.; Lombardi, F.; Lombardi, P.; Ludhová, L.; Lukyanchenko, G.; Machulin, I.; Manecki, S.; Maneschg, W.; Manuzio, G.; Meindl, Q.; Meroni, E.; Miramonti, L.; Misiaszek, M.; Mosteiro, P.; Muratova, V.; Oberauer, L.; Obolensky, M.; Ortica, F.; Otis, K.; Pallavicini, M.; Papp, L.; Perasso, L.; Pocar, A.; Ranucci, G.; Razeto, A.; Re, A.; Romani, A.; Rossi, N.; Saldanha, R.; Salvo, C.; Schönert, S.; Simgen, H.; Skorokhvatov, M.; Smirnov, O.; Sotnikov, A.; Suvorov, Y.; Tartaglia, R.; Testera, G.; Vignaud, D.; Vogelaar, R. B.; Feilitzsch, F. von; Winter, J.; Wójcik, Marcin; Wright, A.; Wurm, M.; Xu, J.; Zaimidoroga, O.; Zavatarelli, S.; Zuzel, G.

doi:10.1103/physrevd.88.072010

Cited by 42 publications

(31 citation statements)

References 67 publications

(127 reference statements)

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“…These eventually obtained upper limits on |U e4 | 2 of 0.5 × 10 −2 at m ν4 = 1 MeV down to 3 × 10 −4 for m ν4 = 4 MeV, and then increasing to 0.6 × 10 −2 for m ν4 = 9.5 MeV [156]. From observations of the solar neutrino flux, the Borexino experiment has set upper bounds |U e4 | 2 of 10 −3 to 0.4×10 −5 for m ν4 from 1.5 MeV to 14 MeV [157]. However, since the conditions for the diagonality of the neutral weak current are violated in the presence of sterile neutrinos [35,36], a sterile neutrino may decay invisibly, as ν 4 → ν jνℓ ν ℓ .…”

Section: B Limit On Exotic µ Decay Modesmentioning

confidence: 99%

Constraints on sterile neutrinos in the MeV to GeV mass range

2019

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A detailed discussion is given of the analysis of recent data to obtain improved upper bounds on the couplings |Ue4| 2 and |Uµ4| 2 for a mainly sterile neutrino mass eigenstate ν4. Using the excellent agreement among Ft values for superallowed nuclear beta decay, an improved upper limit is derived for emission of a ν4. The agreement of the ratios of branching ratios R (π) e/µ = BR(π + → e + νe)/BR(π + → µ + νµ), R (K) e/µ , R (Ds) e/τ , R (Ds) µ/τ , and R (D)e/τ , and the branching ratios BR(B + → e + νe) and BR(B + → µ + νµ) decays with predictions of the Standard Model, is utilized to derive new constraints on ν4 emission covering the ν4 mass range from MeV to GeV. We also discuss constraints from peak search experiments probing for emission of a ν4 via lepton mixing, as well as constraints from pion beta decay, CKM unitarity, µ decay, leptonic τ decay, and other experimental inputs.

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Section: B Limit On Exotic µ Decay Modesmentioning

confidence: 99%

Constraints on sterile neutrinos in the MeV to GeV mass range

2019

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“…For the background event rate, we use the energy spectra shown in Fig. 2 in [39]. After all cuts, the background rate is R backgr 200 counts/100t×100keV per 446.2 live-days at energy E = 2.185 MeV (For E = 1.485 MeV, the background rate is around 2300 counts/100t×100keV).…”

Section: Total Event Rate and Sensitivity Reachmentioning

confidence: 99%

Light scalars and dark photons in Borexino and LSND experiments

Pospelov

Tsai

2018

Physics Letters B

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Bringing an external radioactive source close to a large underground detector can significantly advance sensitivity not only to sterile neutrinos but also to "dark" gauge bosons and scalars. Here we address in detail the sensitivity reach of the Borexino-SOX configuration, which will see a powerful (a few PBq) 144 Ce− 144 Pr source installed next to the Borexino detector, to light scalar particles coupled to the SM fermions. The mass reach of this configuration is limited by the energy release in the radioactive γ-cascade, which in this particular case is 2.2 MeV. Within that reach one year of operations will achieve an unprecedented sensitivity to coupling constants of such scalars, reaching down to g ∼ 10 −7 levels and probing significant parts of parameter space not excluded by either beam dump constraints or astrophysical bounds. Should the current proton charge radius discrepancy be caused by the exchange of a MeV-mass scalar, then the simplest models will be decisively probed in this setup. We also update the beam dump constraints on light scalars and vectors, and in particular rule out dark photons with masses below 1 MeV, and kinetic mixing couplings 10 −5 . * mpospelov@perimeterinstitute.ca †

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“…We use Ref. [55] to determine the total rate of proton recoil with T e > 12.5 MeV. The constraint on the rate per individual proton is given by 20) In this formula, S lim = 2.44 at 90% c.l., T = 1.282yr is the data-taking period, and N p = 3.2 × 10 31 is the total number of protons.…”

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confidence: 99%

“…The constraint on the rate per individual proton is given by 20) In this formula, S lim = 2.44 at 90% c.l., T = 1.282yr is the data-taking period, and N p = 3.2 × 10 31 is the total number of protons. (N p is recalculated from the number of Carbon atoms, N C = 2.37 × 10 31 [55]). The Borexino collaboration used an efficiency = 0.5 for the specific search of gamma emission at E ∼16 MeV, but this measures the efficiency of detecting a peak.…”

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confidence: 99%

Novel Direct Detection Constraints on Light Dark Matter

2019

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All attempts to directly detect particle dark matter (DM) scattering on nuclei suffer from the partial or total loss of sensitivity for DM masses in the GeV range or below. We derive novel constraints from the inevitable existence of a subdominant, but highly energetic, component of DM generated through collisions with cosmic rays. Subsequent scattering inside conventional DM detectors, as well as neutrino detectors sensitive to nuclear recoils, limits the DM-nucleon scattering cross section to be below 10 −31 cm 2 for both spin-independent and spin-dependent scattering of light DM.

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New limits on heavy sterile neutrino mixing inB8decay obtained with the Borexino detector

Cited by 42 publications

References 67 publications

Constraints on sterile neutrinos in the MeV to GeV mass range

Constraints on sterile neutrinos in the MeV to GeV mass range

Light scalars and dark photons in Borexino and LSND experiments

Novel Direct Detection Constraints on Light Dark Matter

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