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Search for heavy neutrinos with the T2K near detector ND280

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Search for heavy neutrinos with the T2K near detector ND280. / T2K Collaboration ; Brailsford, D.; Dealtry, T.; Finch, A. J.; Knox, A.; Kormos, L. L.; Lawe, M.; Nowak, J.; O'Keeffe, H. M.; Ratoff, P. N.; Shaw, D.

In: Physical Review D, Vol. 100, No. 5, 052006, 10.09.2019.

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@article{75cf6aedf2de436fb46a7dd1056c9a49,
title = "Search for heavy neutrinos with the T2K near detector ND280",
abstract = "This paper reports on the search for heavy neutrinos with masses in the range 140<MN<493 MeV/c2 using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are N→ℓα±π and N→ℓα+ℓβ-ν(-)(α,β=e,μ). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heavy neutrinos to electron-, muon- and tau- flavored currents (Ue2, Uμ2, Uτ2) as a function of the heavy neutrino mass, e.g., Ue2<10-9 at 90% C.L. for a mass of 390 MeV/c2. These constraints are competitive with previous experiments.",
keywords = "hep-ex",
author = "{T2K Collaboration} and K. Abe and R. Akutsu and C. Andreopoulos and M. Antonova and S. Aoki and A. Ariga and Y. Ashida and Y. Awataguchi and Y. Azuma and S. Ban and M. Barbi and Barker, {G. J.} and G. Barr and C. Barry and M. Batkiewicz-Kwasniak and F. Bench and V. Berardi and S. Berkman and Berner, {R. M.} and L. Berns and S. Bhadra and S. Bienstock and A. Blondel and S. Bolognesi and B. Bourguille and D. Brailsford and A. Bravar and C. Bronner and Avanzini, {M. Buizza} and J. Calcutt and T. Campbell and S. Cao and Catanesi, {M. G.} and A. Cervera and A. Chappell and C. Checchia and D. Cherdack and N. Chikuma and G. Christodoulou and J. Coleman and G. Collazuol and T. Dealtry and Finch, {A. J.} and A. Knox and Kormos, {L. L.} and M. Lawe and J. Nowak and O'Keeffe, {H. M.} and Ratoff, {P. N.} and D. Shaw",
year = "2019",
month = sep
day = "10",
doi = "10.1103/PhysRevD.100.052006",
language = "English",
volume = "100",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "American Physical Society",
number = "5",

}

RIS

TY - JOUR

T1 - Search for heavy neutrinos with the T2K near detector ND280

AU - T2K Collaboration

AU - Abe, K.

AU - Akutsu, R.

AU - Andreopoulos, C.

AU - Antonova, M.

AU - Aoki, S.

AU - Ariga, A.

AU - Ashida, Y.

AU - Awataguchi, Y.

AU - Azuma, Y.

AU - Ban, S.

AU - Barbi, M.

AU - Barker, G. J.

AU - Barr, G.

AU - Barry, C.

AU - Batkiewicz-Kwasniak, M.

AU - Bench, F.

AU - Berardi, V.

AU - Berkman, S.

AU - Berner, R. M.

AU - Berns, L.

AU - Bhadra, S.

AU - Bienstock, S.

AU - Blondel, A.

AU - Bolognesi, S.

AU - Bourguille, B.

AU - Brailsford, D.

AU - Bravar, A.

AU - Bronner, C.

AU - Avanzini, M. Buizza

AU - Calcutt, J.

AU - Campbell, T.

AU - Cao, S.

AU - Catanesi, M. G.

AU - Cervera, A.

AU - Chappell, A.

AU - Checchia, C.

AU - Cherdack, D.

AU - Chikuma, N.

AU - Christodoulou, G.

AU - Coleman, J.

AU - Collazuol, G.

AU - Dealtry, T.

AU - Finch, A. J.

AU - Knox, A.

AU - Kormos, L. L.

AU - Lawe, M.

AU - Nowak, J.

AU - O'Keeffe, H. M.

AU - Ratoff, P. N.

AU - Shaw, D.

PY - 2019/9/10

Y1 - 2019/9/10

N2 - This paper reports on the search for heavy neutrinos with masses in the range 140<MN<493 MeV/c2 using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are N→ℓα±π and N→ℓα+ℓβ-ν(-)(α,β=e,μ). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heavy neutrinos to electron-, muon- and tau- flavored currents (Ue2, Uμ2, Uτ2) as a function of the heavy neutrino mass, e.g., Ue2<10-9 at 90% C.L. for a mass of 390 MeV/c2. These constraints are competitive with previous experiments.

AB - This paper reports on the search for heavy neutrinos with masses in the range 140<MN<493 MeV/c2 using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are N→ℓα±π and N→ℓα+ℓβ-ν(-)(α,β=e,μ). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heavy neutrinos to electron-, muon- and tau- flavored currents (Ue2, Uμ2, Uτ2) as a function of the heavy neutrino mass, e.g., Ue2<10-9 at 90% C.L. for a mass of 390 MeV/c2. These constraints are competitive with previous experiments.

KW - hep-ex

U2 - 10.1103/PhysRevD.100.052006

DO - 10.1103/PhysRevD.100.052006

M3 - Journal article

VL - 100

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 5

M1 - 052006

ER -