Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

M. Nayak; S. Dey; A. Soffer; I. Adachi; H. Aihara; S. Al Said; D. M. Asner; H. Atmacan; R. Ayad; V. Babu; Sw Banerjee; M. Bauer; P. Behera; K. Belous; M. Bessner; V. Bhardwaj; B. Bhuyan; T. Bilka; D. Biswas; A. Bobrov; D. Bodrov; M. Bračko; P. Branchini; T. E. Browder; A. Budano; M. Campajola; D. Červenkov; M. C. Chang; B. G. Cheon; H. E. Cho; K. Cho; Y. Choi; S. Choudhury; S. Das; G. De Nardo; G. De Pietro; R. Dhamija; F. Di Capua; J. Dingfelder; Z. DoleŽal; T. V. Dong; S. Dubey; P. Ecker; D. Epifanov; T. Ferber; O. Fogel; B. G. Fulsom; V. Gaur; A. Giri; P. Goldenzweig; E. Graziani; K. Gudkova; C. Hadjivasiliou; S. Halder; T. Hara; K. Hayasaka; H. Hayashii; S. Hazra; M. T. Hedges; D. Herrmann; W. S. Hou; C. L. Hsu; K. Inami; A. Ishikawa; R. Itoh; M. Iwasaki; W. W. Jacobs; S. Jia; Y. Jin; T. Kawasaki; C. Kiesling; C. H. Kim; D. Y. Kim; K. Kinoshita; P. Kodyš; A. Korobov; S. Korpar; P. KriŽan; P. Krokovny; T. Kuhr; D. Kumar; R. Kumar; A. Kuzmin; Y. J. Kwon; Y. T. Lai; T. Lam; J. S. Lange; M. Laurenza; S. C. Lee; L. K. Li; Y. B. Li; L. Li Gioi; J. Libby; K. Lieret; Y. R. Lin; D. Liventsev; T. Luo; Y. Ma; M. Masuda; S. K. Maurya; F. Meier; M. Merola; K. Miyabayashi; R. Mizuk; G. B. Mohanty; R. Mussa; I. Nakamura; M. Nakao; Z. Natkaniec; A. Natochii; L. Nayak; S. Nishida; S. Ogawa; H. Ono; P. Oskin; P. Pakhlov; G. Pakhlova; S. Pardi; H. Park; J. Park; S. H. Park; A. Passeri; S. Patra; S. Paul; R. Pestotnik; L. E. Piilonen; T. Podobnik; E. Prencipe; M. T. Prim; M. Röhrken; A. Rostomyan; N. Rout; G. Russo; S. Sandilya; L. Santelj; V. Savinov; G. Schnell; C. Schwanda; Y. Seino; K. Senyo; M. E. Sevior; W. Shan; C. Sharma; C. P. Shen; J. G. Shiu; J. B. Singh; A. Sokolov; E. Solovieva; M. Starič; M. Sumihama; M. Takizawa; K. Tanida; F. Tenchini; Y. Unno; S. Uno; Y. Ushiroda; S. E. Vahsen; M. Z. Wang; S. Watanuki; E. Won; B. D. Yabsley; W. Yan; J. H. Yin; L. Yuan; Z. P. Zhang; V. Zhilich; V. Zhukova

doi:10.1103/PhysRevD.109.L111102

Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

M. Nayak, S. Dey, A. Soffer, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, R. Ayad, V. Babu, Sw Banerjee, M. Bauer, P. Behera, K. Belous, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Biswas, A. BobrovD. Bodrov, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. C. Chang, B. G. Cheon, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. DoleŽal, T. V. Dong, S. Dubey, P. Ecker, D. Epifanov, T. Ferber, O. Fogel, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, K. Gudkova, C. Hadjivasiliou, S. Halder, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, M. T. Hedges, D. Herrmann, W. S. Hou, C. L. Hsu, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, P. KriŽan, P. Krokovny, T. Kuhr, D. Kumar, R. Kumar, A. Kuzmin, Y. J. Kwon, Y. T. Lai, T. Lam, J. S. Lange, M. Laurenza, S. C. Lee, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, Y. R. Lin, D. Liventsev, T. Luo, Y. Ma, M. Masuda, S. K. Maurya, F. Meier, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, R. Mussa, I. Nakamura, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, S. Nishida, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, J. Park, S. H. Park, A. Passeri, S. Patra, S. Paul, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, C. Sharma, C. P. Shen, J. G. Shiu, J. B. Singh, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, M. Z. Wang, S. Watanuki, E. Won, B. D. Yabsley, W. Yan, J. H. Yin, L. Yuan, Z. P. Zhang, V. Zhilich, V. Zhukova

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The data sample was collected at and just below the center-of-mass energies of the (4S) and (5S) resonances and has an integrated luminosity of 915 fb-1, corresponding to (836±12)×106 e+e-→τ+τ- events. We search for production of the HNL (denoted N) in the decay τ-→π-N followed by its decay via N→μ+μ-ντ. The search focuses on the parameter-space region in which the HNL is long-lived, so that the μ+μ- originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the τ neutrino as a function of the HNL mass.

Original language	English
Article number	L111102
Journal	Physical Review D
Volume	109
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.109.L111102
State	Published - 1 Jun 2024

Funding

Funders	Funder number
Ministry of Education
Narodowe Centrum Nauki
National Science Foundation
Korea Research Environment Open Network
Japan Society for the Promotion of Science
Israel Science Foundation
National Institute of Informatics
Korea Institute of Science and Technology Information
Carl-Zeiss-Stiftung
Instituto Nazionale di Fisica Nucleare
Austrian Federal Ministry of Education, Science and Research and Austrian Science Fund
Department of Science and Technology, Ministry of Science and Technology, India
Deutsche Forschungsgemeinschaft
Excellence Cluster Universe
United States-Israel Binational Science Foundation
Volkswagen Foundation
U.S. Department of Energy
Ministry of Education and Science of the Russian Federation
National Science and Technology Council
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Nagoya University
National Research University Higher School of Economics
Ministerstwo Edukacji i Nauki
GLORIAD
Ikerbasque, Basque Foundation for Science
Ministry of Education, Culture, Sports, Science and Technology
Ministerio de Ciencia e Innovación	PID2022-136510NB-C33
Ministerio de Ciencia e Innovación
University of Tabuk	S-1440-0321, S-0280-1439, S-0256-1438
University of Tabuk
Austrian Science Fund	P 31361-N36
Austrian Science Fund
Australian Research Council	DP210101900, DP210102831, DE220100462, LE210100098, LE230100085
Australian Research Council
Horizon 2020 Framework Programme	884719
Horizon 2020 Framework Programme
National Key Research and Development Program of China	2022YFA1601903
National Key Research and Development Program of China
Javna Agencija za Raziskovalno Dejavnost RS	J1-9124, P1-0135
Javna Agencija za Raziskovalno Dejavnost RS
Grantová Agentura České Republiky	22-18469S
Grantová Agentura České Republiky
Department of Atomic Energy, Government of India	RTI 4002
Department of Atomic Energy, Government of India
European Commission	947006
European Commission
National Natural Science Foundation of China	12175041, 12135005, 11975076, 11761141009, 11575017, 12150004, 12161141008, 11705209
National Natural Science Foundation of China
University of Petroleum and Energy Studies	D-SOE/20062022/06, D-SEED-INFRA/17052023/01
University of Petroleum and Energy Studies
Natural Science Foundation of Shandong Province	ZR2022JQ02
Natural Science Foundation of Shandong Province
National Research Foundation of Korea	2022R1A2C1003993, 2016R1D1A1B02012900, 2018R1A2B3003643, RS202200197659, 2021R1A6A1A03043957, 2021R1F1A1064008, 2021R1F1A1060423, 2019R1I1A3A01058933, 2018R1A6A1A06024970
National Research Foundation of Korea

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10.1103/PhysRevD.109.L111102

Cite this

Nayak, M., Dey, S., Soffer, A., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Ayad, R., Babu, V., Banerjee, S., Bauer, M., Behera, P., Belous, K., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswas, D., ... Zhukova, V. (2024). Search for a heavy neutral lepton that mixes predominantly with the tau neutrino. Physical Review D, 109(11), Article L111102. https://doi.org/10.1103/PhysRevD.109.L111102

@article{f6a537bee4ef4d3b98ff1fcfd289e962,

title = "Search for a heavy neutral lepton that mixes predominantly with the tau neutrino",

abstract = "We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The data sample was collected at and just below the center-of-mass energies of the (4S) and (5S) resonances and has an integrated luminosity of 915 fb-1, corresponding to (836±12)×106 e+e-→τ+τ- events. We search for production of the HNL (denoted N) in the decay τ-→π-N followed by its decay via N→μ+μ-ντ. The search focuses on the parameter-space region in which the HNL is long-lived, so that the μ+μ- originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the τ neutrino as a function of the HNL mass.",

author = "M. Nayak and S. Dey and A. Soffer and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and R. Ayad and V. Babu and Sw Banerjee and M. Bauer and P. Behera and K. Belous and M. Bessner and V. Bhardwaj and B. Bhuyan and T. Bilka and D. Biswas and A. Bobrov and D. Bodrov and M. Bra{\v c}ko and P. Branchini and Browder, {T. E.} and A. Budano and M. Campajola and D. {\v C}ervenkov and Chang, {M. C.} and Cheon, {B. G.} and Cho, {H. E.} and K. Cho and Y. Choi and S. Choudhury and S. Das and {De Nardo}, G. and {De Pietro}, G. and R. Dhamija and {Di Capua}, F. and J. Dingfelder and Z. Dole{\v Z}al and Dong, {T. V.} and S. Dubey and P. Ecker and D. Epifanov and T. Ferber and O. Fogel and Fulsom, {B. G.} and V. Gaur and A. Giri and P. Goldenzweig and E. Graziani and K. Gudkova and C. Hadjivasiliou and S. Halder and T. Hara and K. Hayasaka and H. Hayashii and S. Hazra and Hedges, {M. T.} and D. Herrmann and Hou, {W. S.} and Hsu, {C. L.} and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Jacobs, {W. W.} and S. Jia and Y. Jin and T. Kawasaki and C. Kiesling and Kim, {C. H.} and Kim, {D. Y.} and K. Kinoshita and P. Kody{\v s} and A. Korobov and S. Korpar and P. Kri{\v Z}an and P. Krokovny and T. Kuhr and D. Kumar and R. Kumar and A. Kuzmin and Kwon, {Y. J.} and Lai, {Y. T.} and T. Lam and Lange, {J. S.} and M. Laurenza and Lee, {S. C.} and Li, {L. K.} and Li, {Y. B.} and {Li Gioi}, L. and J. Libby and K. Lieret and Lin, {Y. R.} and D. Liventsev and T. Luo and Y. Ma and M. Masuda and Maurya, {S. K.} and F. Meier and M. Merola and K. Miyabayashi and R. Mizuk and Mohanty, {G. B.} and R. Mussa and I. Nakamura and M. Nakao and Z. Natkaniec and A. Natochii and L. Nayak and S. Nishida and S. Ogawa and H. Ono and P. Oskin and P. Pakhlov and G. Pakhlova and S. Pardi and H. Park and J. Park and Park, {S. H.} and A. Passeri and S. Patra and S. Paul and R. Pestotnik and Piilonen, {L. E.} and T. Podobnik and E. Prencipe and Prim, {M. T.} and M. R{\"o}hrken and A. Rostomyan and N. Rout and G. Russo and S. Sandilya and L. Santelj and V. Savinov and G. Schnell and C. Schwanda and Y. Seino and K. Senyo and Sevior, {M. E.} and W. Shan and C. Sharma and Shen, {C. P.} and Shiu, {J. G.} and Singh, {J. B.} and A. Sokolov and E. Solovieva and M. Stari{\v c} and M. Sumihama and M. Takizawa and K. Tanida and F. Tenchini and Y. Unno and S. Uno and Y. Ushiroda and Vahsen, {S. E.} and Wang, {M. Z.} and S. Watanuki and E. Won and Yabsley, {B. D.} and W. Yan and Yin, {J. H.} and L. Yuan and Zhang, {Z. P.} and V. Zhilich and V. Zhukova",

note = "Publisher Copyright: {\textcopyright} 2024 authors. Published by the American Physical Society.",

year = "2024",

month = jun,

day = "1",

doi = "10.1103/PhysRevD.109.L111102",

language = "אנגלית",

volume = "109",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "11",

}

Nayak, M, Dey, S, Soffer, A, Adachi, I, Aihara, H, Al Said, S, Asner, DM, Atmacan, H, Ayad, R, Babu, V, Banerjee, S, Bauer, M, Behera, P, Belous, K, Bessner, M, Bhardwaj, V, Bhuyan, B, Bilka, T, Biswas, D, Bobrov, A, Bodrov, D, Bračko, M, Branchini, P, Browder, TE, Budano, A, Campajola, M, Červenkov, D, Chang, MC, Cheon, BG, Cho, HE, Cho, K, Choi, Y, Choudhury, S, Das, S, De Nardo, G, De Pietro, G, Dhamija, R, Di Capua, F, Dingfelder, J, DoleŽal, Z, Dong, TV, Dubey, S, Ecker, P, Epifanov, D, Ferber, T, Fogel, O, Fulsom, BG, Gaur, V, Giri, A, Goldenzweig, P, Graziani, E, Gudkova, K, Hadjivasiliou, C, Halder, S, Hara, T, Hayasaka, K, Hayashii, H, Hazra, S, Hedges, MT, Herrmann, D, Hou, WS, Hsu, CL, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Jacobs, WW, Jia, S, Jin, Y, Kawasaki, T, Kiesling, C, Kim, CH, Kim, DY, Kinoshita, K, Kodyš, P, Korobov, A, Korpar, S, KriŽan, P, Krokovny, P, Kuhr, T, Kumar, D, Kumar, R, Kuzmin, A, Kwon, YJ, Lai, YT, Lam, T, Lange, JS, Laurenza, M, Lee, SC, Li, LK, Li, YB, Li Gioi, L, Libby, J, Lieret, K, Lin, YR, Liventsev, D, Luo, T, Ma, Y, Masuda, M, Maurya, SK, Meier, F, Merola, M, Miyabayashi, K, Mizuk, R, Mohanty, GB, Mussa, R, Nakamura, I, Nakao, M, Natkaniec, Z, Natochii, A, Nayak, L, Nishida, S, Ogawa, S, Ono, H, Oskin, P, Pakhlov, P, Pakhlova, G, Pardi, S, Park, H, Park, J, Park, SH, Passeri, A, Patra, S, Paul, S, Pestotnik, R, Piilonen, LE, Podobnik, T, Prencipe, E, Prim, MT, Röhrken, M, Rostomyan, A, Rout, N, Russo, G, Sandilya, S, Santelj, L, Savinov, V, Schnell, G, Schwanda, C, Seino, Y, Senyo, K, Sevior, ME, Shan, W, Sharma, C, Shen, CP, Shiu, JG, Singh, JB, Sokolov, A, Solovieva, E, Starič, M, Sumihama, M, Takizawa, M, Tanida, K, Tenchini, F, Unno, Y, Uno, S, Ushiroda, Y, Vahsen, SE, Wang, MZ, Watanuki, S, Won, E, Yabsley, BD, Yan, W, Yin, JH, Yuan, L, Zhang, ZP, Zhilich, V & Zhukova, V 2024, 'Search for a heavy neutral lepton that mixes predominantly with the tau neutrino', Physical Review D, vol. 109, no. 11, L111102. https://doi.org/10.1103/PhysRevD.109.L111102

TY - JOUR

T1 - Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

AU - Nayak, M.

AU - Dey, S.

AU - Soffer, A.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Ayad, R.

AU - Babu, V.

AU - Banerjee, Sw

AU - Bauer, M.

AU - Behera, P.

AU - Belous, K.

AU - Bessner, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswas, D.

AU - Bobrov, A.

AU - Bodrov, D.

AU - Bračko, M.

AU - Branchini, P.

AU - Browder, T. E.

AU - Budano, A.

AU - Campajola, M.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Cheon, B. G.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Das, S.

AU - De Nardo, G.

AU - De Pietro, G.

AU - Dhamija, R.

AU - Di Capua, F.

AU - Dingfelder, J.

AU - DoleŽal, Z.

AU - Dong, T. V.

AU - Dubey, S.

AU - Ecker, P.

AU - Epifanov, D.

AU - Ferber, T.

AU - Fogel, O.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Graziani, E.

AU - Gudkova, K.

AU - Hadjivasiliou, C.

AU - Halder, S.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazra, S.

AU - Hedges, M. T.

AU - Herrmann, D.

AU - Hou, W. S.

AU - Hsu, C. L.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Jacobs, W. W.

AU - Jia, S.

AU - Jin, Y.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, C. H.

AU - Kim, D. Y.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Korobov, A.

AU - Korpar, S.

AU - KriŽan, P.

AU - Krokovny, P.

AU - Kuhr, T.

AU - Kumar, D.

AU - Kumar, R.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lai, Y. T.

AU - Lam, T.

AU - Lange, J. S.

AU - Laurenza, M.

AU - Lee, S. C.

AU - Li, L. K.

AU - Li, Y. B.

AU - Li Gioi, L.

AU - Libby, J.

AU - Lieret, K.

AU - Lin, Y. R.

AU - Liventsev, D.

AU - Luo, T.

AU - Ma, Y.

AU - Masuda, M.

AU - Maurya, S. K.

AU - Meier, F.

AU - Merola, M.

AU - Miyabayashi, K.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Mussa, R.

AU - Nakamura, I.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Natochii, A.

AU - Nayak, L.

AU - Nishida, S.

AU - Ogawa, S.

AU - Ono, H.

AU - Oskin, P.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pardi, S.

AU - Park, H.

AU - Park, J.

AU - Park, S. H.

AU - Passeri, A.

AU - Patra, S.

AU - Paul, S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Podobnik, T.

AU - Prencipe, E.

AU - Prim, M. T.

AU - Röhrken, M.

AU - Rostomyan, A.

AU - Rout, N.

AU - Russo, G.

AU - Sandilya, S.

AU - Santelj, L.

AU - Savinov, V.

AU - Schnell, G.

AU - Schwanda, C.

AU - Seino, Y.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shan, W.

AU - Sharma, C.

AU - Shen, C. P.

AU - Shiu, J. G.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Sumihama, M.

AU - Takizawa, M.

AU - Tanida, K.

AU - Tenchini, F.

AU - Unno, Y.

AU - Uno, S.

AU - Ushiroda, Y.

AU - Vahsen, S. E.

AU - Wang, M. Z.

AU - Watanuki, S.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yan, W.

AU - Yin, J. H.

AU - Yuan, L.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhukova, V.

PY - 2024/6/1

Y1 - 2024/6/1

N2 - We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The data sample was collected at and just below the center-of-mass energies of the (4S) and (5S) resonances and has an integrated luminosity of 915 fb-1, corresponding to (836±12)×106 e+e-→τ+τ- events. We search for production of the HNL (denoted N) in the decay τ-→π-N followed by its decay via N→μ+μ-ντ. The search focuses on the parameter-space region in which the HNL is long-lived, so that the μ+μ- originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the τ neutrino as a function of the HNL mass.

AB - We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The data sample was collected at and just below the center-of-mass energies of the (4S) and (5S) resonances and has an integrated luminosity of 915 fb-1, corresponding to (836±12)×106 e+e-→τ+τ- events. We search for production of the HNL (denoted N) in the decay τ-→π-N followed by its decay via N→μ+μ-ντ. The search focuses on the parameter-space region in which the HNL is long-lived, so that the μ+μ- originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the τ neutrino as a function of the HNL mass.

UR - http://www.scopus.com/inward/record.url?scp=85196008755&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.109.L111102

DO - 10.1103/PhysRevD.109.L111102

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85196008755

SN - 2470-0010

VL - 109

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - L111102

ER -

Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

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