Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb

We consider the lepton-number-violating processes in Λb/Λc decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: Λb0→B+μ-μ-π+, where B+ is Λc+ or proton, and Λc+→Λμ+μ+π- as function of the mass of the sterile neutrino mN and the heavy-l...

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Detalles Bibliográficos
Autores principales: Zhang, Guangshuai, Ma, Bo-Qiang
Lenguaje:eng
Publicado: 2021
Materias:
hep-ph
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.103.033004
http://cds.cern.ch/record/2752937
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author Zhang, Guangshuai
Ma, Bo-Qiang
author_facet Zhang, Guangshuai
Ma, Bo-Qiang
author_sort Zhang, Guangshuai
collection CERN
description We consider the lepton-number-violating processes in Λb/Λc decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: Λb0→B+μ-μ-π+, where B+ is Λc+ or proton, and Λc+→Λμ+μ+π- as function of the mass of the sterile neutrino mN and the heavy-light mixing coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix |UμN|2. The effect of finite detector size is included in our calculation. After comparing the theoretical effective branching ratio with the expected experimental ability of LHCb, we give the sensitivity upper bounds on |UμN|2 on the (|UμN|2-mN) plane. These channels give comparable results with the bounds given by different search strategies (e.g., at Belle, NuTeV, DELPHI, and BEBC) in the mass region mN≃0.25  GeV–4.5  GeV, and the limits are stronger in the mass range 2  GeV<mN<4.5  GeV.
id cern-2752937
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
record_format invenio
spelling cern-27529372023-01-31T08:44:48Zdoi:10.1103/PhysRevD.103.033004http://cds.cern.ch/record/2752937engZhang, GuangshuaiMa, Bo-QiangSearching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCbhep-phParticle Physics - PhenomenologyWe consider the lepton-number-violating processes in Λb/Λc decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: Λb0→B+μ-μ-π+, where B+ is Λc+ or proton, and Λc+→Λμ+μ+π- as function of the mass of the sterile neutrino mN and the heavy-light mixing coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix |UμN|2. The effect of finite detector size is included in our calculation. After comparing the theoretical effective branching ratio with the expected experimental ability of LHCb, we give the sensitivity upper bounds on |UμN|2 on the (|UμN|2-mN) plane. These channels give comparable results with the bounds given by different search strategies (e.g., at Belle, NuTeV, DELPHI, and BEBC) in the mass region mN≃0.25  GeV–4.5  GeV, and the limits are stronger in the mass range 2  GeV<mN<4.5  GeV.We consider the lepton-number-violating processes in $\Lambda_b$/$\Lambda_c$ decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: $\Lambda_b^{0} \rightarrow \mathcal{B}^+ \mu^{-}\mu^- \pi^+$, where $\mathcal{B}^+$ is $\Lambda_c^+$ or proton, and $\Lambda_c^{+} \rightarrow \Lambda \mu^{+}\mu^+ \pi^-$, as function of the mass of the sterile neutrino $m_N$ and the heavy-light mixing coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix $|U_{\mu N}|^2$. The effect of finite detector size is included in our calculation. After comparing the theoretical effective branching ratio with the expected experimental ability of LHCb, we give the sensitivity upper bounds on $|U_{\mu N}|^2$ on the ($|U_{\mu N}|^2$-$m_N$) plane. These channels give comparable results with the bounds given by different search strategies (e.g., at Belle, NuTeV, DELPHI and BEBC) in the mass region $m_N \simeq$ 0.25 GeV - 4.5 GeV, and the limits are stronger in the mass range 2 GeV $<m_N<$ 4.5 GeV.arXiv:2101.05566oai:cds.cern.ch:27529372021-01-14
spellingShingle hep-ph
Particle Physics - Phenomenology
Zhang, Guangshuai
Ma, Bo-Qiang
Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title_full Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title_fullStr Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title_full_unstemmed Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title_short Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
title_sort searching for lepton number violating $\lambda$ baryon decays mediated by gev-scale majorana neutrino with lhcb
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.103.033004
http://cds.cern.ch/record/2752937
work_keys_str_mv AT zhangguangshuai searchingforleptonnumberviolatinglambdabaryondecaysmediatedbygevscalemajorananeutrinowithlhcb
AT maboqiang searchingforleptonnumberviolatinglambdabaryondecaysmediatedbygevscalemajorananeutrinowithlhcb

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