Probing sterile neutrinos in B (D) meson decays at Belle II (BESIII)

C. S. Kim; Youngjoon Kwon; Donghun Lee; Sechul Oh; Dibyakrupa Sahoo

doi:10.1140/epjc/s10052-020-8310-2

Probing sterile neutrinos in B (D) meson decays at Belle II (BESIII)

C. S. Kim, Youngjoon Kwon, Donghun Lee, Sechul Oh, Dibyakrupa Sahoo

Department of Physics

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

8 Citations (Scopus)

Abstract

We present, how a systematic study of B→ DℓN (D→ KℓN) decays with ℓ= μ, τ, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino N and/or constrain its mixing with active neutrinos ν_ℓ, which is parameterized by | U_ℓ_N| ². Our constraint on | U_μ_N| ² that can be achieved from the full Belle II data is comparable with what can be obtained from the much larger data set of the upgraded LHCb. Additionally, our method offers better constraint on | U_μ_N| ² for mass of sterile neutrino m_N< 2 GeV. We can also probe the Dirac and Majorana nature of N by observing the sequential decay of N, including suppression from observation of a displaced vertex as well as helicity flip, for Majorana N.

Original language	English
Article number	730
Journal	European Physical Journal C
Volume	80
Issue number	8
DOIs	https://doi.org/10.1140/epjc/s10052-020-8310-2
Publication status	Published - 2020 Aug 1

Bibliographical note

Funding Information:
The work of C.S.K. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF2018R1A4A1025334). This work of D.S. was supported (in part) by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2018 (project no.: 2018-12-0145).

Publisher Copyright:
© 2020, The Author(s).

All Science Journal Classification (ASJC) codes

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

Access to Document

10.1140/epjc/s10052-020-8310-2

Cite this

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title = "Probing sterile neutrinos in B (D) meson decays at Belle II (BESIII)",

abstract = "We present, how a systematic study of B→ DℓN (D→ KℓN) decays with ℓ= μ, τ, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino N and/or constrain its mixing with active neutrinos νℓ, which is parameterized by | UℓN| 2. Our constraint on | UμN| 2 that can be achieved from the full Belle II data is comparable with what can be obtained from the much larger data set of the upgraded LHCb. Additionally, our method offers better constraint on | UμN| 2 for mass of sterile neutrino mN< 2 GeV. We can also probe the Dirac and Majorana nature of N by observing the sequential decay of N, including suppression from observation of a displaced vertex as well as helicity flip, for Majorana N.",

author = "Kim, {C. S.} and Youngjoon Kwon and Donghun Lee and Sechul Oh and Dibyakrupa Sahoo",

note = "Funding Information: The work of C.S.K. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF2018R1A4A1025334). This work of D.S. was supported (in part) by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2018 (project no.: 2018-12-0145). Publisher Copyright: {\textcopyright} 2020, The Author(s).",

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AU - Kim, C. S.

AU - Kwon, Youngjoon

AU - Lee, Donghun

AU - Oh, Sechul

AU - Sahoo, Dibyakrupa

N1 - Funding Information: The work of C.S.K. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF2018R1A4A1025334). This work of D.S. was supported (in part) by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2018 (project no.: 2018-12-0145). Publisher Copyright: © 2020, The Author(s).

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N2 - We present, how a systematic study of B→ DℓN (D→ KℓN) decays with ℓ= μ, τ, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino N and/or constrain its mixing with active neutrinos νℓ, which is parameterized by | UℓN| 2. Our constraint on | UμN| 2 that can be achieved from the full Belle II data is comparable with what can be obtained from the much larger data set of the upgraded LHCb. Additionally, our method offers better constraint on | UμN| 2 for mass of sterile neutrino mN< 2 GeV. We can also probe the Dirac and Majorana nature of N by observing the sequential decay of N, including suppression from observation of a displaced vertex as well as helicity flip, for Majorana N.

AB - We present, how a systematic study of B→ DℓN (D→ KℓN) decays with ℓ= μ, τ, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino N and/or constrain its mixing with active neutrinos νℓ, which is parameterized by | UℓN| 2. Our constraint on | UμN| 2 that can be achieved from the full Belle II data is comparable with what can be obtained from the much larger data set of the upgraded LHCb. Additionally, our method offers better constraint on | UμN| 2 for mass of sterile neutrino mN< 2 GeV. We can also probe the Dirac and Majorana nature of N by observing the sequential decay of N, including suppression from observation of a displaced vertex as well as helicity flip, for Majorana N.

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