Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays
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 ν ¯ ℓ $$ B\to {D}^{\ast}\ell {\overline{\nu}}_{\ell } $$ decays, with ℓ = e, μ....
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| Format: | Article |
| Language: | English |
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2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)040 |
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| author | Florian U. Bernlochner Marco Fedele Tim Kretz Ulrich Nierste Markus T. Prim |
| author_facet | Florian U. Bernlochner Marco Fedele Tim Kretz Ulrich Nierste Markus T. Prim |
| author_sort | Florian U. Bernlochner |
| collection | DOAJ |
| description | 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 ν ¯ ℓ $$ B\to {D}^{\ast}\ell {\overline{\nu}}_{\ell } $$ decays, with ℓ = e, μ. Indeed, a sterile neutrino N may lead to competing B → D ∗ ℓ N ¯ $$ B\to {D}^{\ast}\ell \overline{N} $$ 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 M miss 2 $$ {M}_{\textrm{miss}}^2 $$ Belle distribution to search for evidences of an additional massive neutrino. We found in such a way a small hint at M miss 2 $$ {M}_{\textrm{miss}}^2 $$ ∼ (354 MeV)2. However, the Belle angular analysis is sensitive to N masses up to O $$ \mathcal{O} $$ (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. |
| format | Article |
| id | doaj-art-9d9748b3fedf491495cb087774d62d91 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-9d9748b3fedf491495cb087774d62d912025-01-19T12:07:35ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025112310.1007/JHEP01(2025)040Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decaysFlorian U. Bernlochner0Marco Fedele1Tim Kretz2Ulrich Nierste3Markus T. Prim4Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität BonnInstitute for Theoretical Particle Physics, Karlsruhe Institute of Technology (KIT)Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology (KIT)Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology (KIT)Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität BonnAbstract 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 ν ¯ ℓ $$ B\to {D}^{\ast}\ell {\overline{\nu}}_{\ell } $$ decays, with ℓ = e, μ. Indeed, a sterile neutrino N may lead to competing B → D ∗ ℓ N ¯ $$ B\to {D}^{\ast}\ell \overline{N} $$ 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 M miss 2 $$ {M}_{\textrm{miss}}^2 $$ Belle distribution to search for evidences of an additional massive neutrino. We found in such a way a small hint at M miss 2 $$ {M}_{\textrm{miss}}^2 $$ ∼ (354 MeV)2. However, the Belle angular analysis is sensitive to N masses up to O $$ \mathcal{O} $$ (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.https://doi.org/10.1007/JHEP01(2025)040Bottom QuarksSemi-Leptonic DecaysSterile or Heavy Neutrinos |
| spellingShingle | Florian U. Bernlochner Marco Fedele Tim Kretz Ulrich Nierste Markus T. Prim Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays Journal of High Energy Physics Bottom Quarks Semi-Leptonic Decays Sterile or Heavy Neutrinos |
| title | Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays |
| title_full | Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays |
| title_fullStr | Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays |
| title_full_unstemmed | Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays |
| title_short | Model independent bounds on heavy sterile neutrinos from the angular distribution of B → D* ℓν decays |
| title_sort | model independent bounds on heavy sterile neutrinos from the angular distribution of b d lν decays |
| topic | Bottom Quarks Semi-Leptonic Decays Sterile or Heavy Neutrinos |
| url | https://doi.org/10.1007/JHEP01(2025)040 |
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