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Author  |
Bernlochner, F.U.; Fedele, M.; Kretz, T.; Nierste, U.; Prim, M.T. |
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Title |
Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D*ℓν decays |
Type |
Journal Article |
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Year |
2025 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
01 |
Issue |
1 |
Pages |
040 - 23pp |
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Keywords |
Bottom Quarks; Semi-Leptonic Decays; Sterile or Heavy Neutrinos |
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Abstract |
In this paper we study the bounds that can be inferred on New Physics couplings to heavy sterile neutrinos N from the recent measurements performed by the Belle collaboration of the angular analysis of B -> D l nu l decays, with l = e, mu. Indeed, a sterile neutrino N may lead to competing B -> D & lowast;& ell;N<overline> decays and Belle might have measured an incoherent sum of these two independent channels. After reviewing the theoretical formalism required to describe this phenomenon in full generality, we first perform a bump hunt in the Mmiss2 Belle distribution to search for evidences of an additional massive neutrino. We found in such a way a small hint at Mmiss2 similar to (354 MeV)2. However, the Belle angular analysis is sensitive to N masses up to O(50 MeV), preventing us to further inspect this hint. Nevertheless, we study the potential impact of this additional channel in the allowed mass range on the measured angular distributions and extract model-independent bounds on the new-physics couplings which could mediate such an interaction. In particular, in the mass window here inspected, we obtain the most stringent bounds for vector and left-handed scalar operators to date. |
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Address |
[Bernlochner, Florian U.; Prim, Markus T.] Rhein Friedrich Wilhelms Univ Bonn, Phys Inst, Nussallee 12, D-53115 Bonn, Germany, Email: florian.urs.bernlochner@cern.ch; |
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Publisher |
Springer |
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Language |
English |
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ISSN |
1029-8479 |
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Notes |
WOS:001389414300002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6405 |
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