Searching for signatures of new physics in $B \to K \, ν\, \overlineν$ to distinguish between Dirac and Majorana neutrinos
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
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2024
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| author | Kim, C. S. Sahoo, Dibyakrupa Vishnudath, K. N. |
| author_facet | Kim, C. S. Sahoo, Dibyakrupa Vishnudath, K. N. |
| contents | We conduct a model-independent analysis of the distinct signatures of various generic new physics possibilities in the decay $B \to K \, ν\, \overlineν$ by analyzing the branching ratio as well as the missing mass-square distribution. Considering the final neutrinos to be of the same flavor with non-zero mass, we discuss the new physics contributions for both Dirac and Majorana neutrino possibilities. In our study, we utilize the analytical relations among form factors in semi-leptonic $B \to K$ transitions, which are consistent with current lattice QCD predictions to a very high numerical accuracy. We provide constraints on different new physics parameters, taking into account the recent measurement of $B^+ \to K^+ \, ν\, \overlineν$ branching ratio by the Belle-II collaboration. In future, if the missing mass-square distribution for $B^+ \to K^+ \, ν\, \overlineν$ decay gets reported by Belle-II with analysis of more events than their present data set, one can not only investigate possible new physics effects in these decays, but also probe the Dirac/Majorana nature of the neutrinos using quantum statistics, since a difference between the two cases is known to exist in the presence of non-standard neutrino interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_17341 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Searching for signatures of new physics in $B \to K \, ν\, \overlineν$ to distinguish between Dirac and Majorana neutrinos Kim, C. S. Sahoo, Dibyakrupa Vishnudath, K. N. High Energy Physics - Phenomenology We conduct a model-independent analysis of the distinct signatures of various generic new physics possibilities in the decay $B \to K \, ν\, \overlineν$ by analyzing the branching ratio as well as the missing mass-square distribution. Considering the final neutrinos to be of the same flavor with non-zero mass, we discuss the new physics contributions for both Dirac and Majorana neutrino possibilities. In our study, we utilize the analytical relations among form factors in semi-leptonic $B \to K$ transitions, which are consistent with current lattice QCD predictions to a very high numerical accuracy. We provide constraints on different new physics parameters, taking into account the recent measurement of $B^+ \to K^+ \, ν\, \overlineν$ branching ratio by the Belle-II collaboration. In future, if the missing mass-square distribution for $B^+ \to K^+ \, ν\, \overlineν$ decay gets reported by Belle-II with analysis of more events than their present data set, one can not only investigate possible new physics effects in these decays, but also probe the Dirac/Majorana nature of the neutrinos using quantum statistics, since a difference between the two cases is known to exist in the presence of non-standard neutrino interactions. |
| title | Searching for signatures of new physics in $B \to K \, ν\, \overlineν$ to distinguish between Dirac and Majorana neutrinos |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2405.17341 |