Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.15461v1</id>\n    <title>Probing the neutrino mass through semileptonic meson decays</title>\n    <updated>2026-03-16T15:56:46Z</updated>\n    <link href='https://arxiv.org/abs/2603.15461v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.15461v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>We argue that a detailed analysis of semileptonic decays can test the possibility of a massive neutrino. The key observable, related to the forward-backward asymmetry, is exactly zero for a massless neutrino but becomes non-zero if the neutral lepton is heavy and interacts with Standard Model fields via left-handed operators. For right-handed interactions, this quantity differs significantly from zero even for a massless right-handed neutrino. We demonstrate this explicitly using the example of a pseudoscalar meson decaying into another pseudoscalar meson. A similar discussion applies to decays into a vector meson, with an additional subtlety addressed in this work.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='hep-ph'/>\n    <published>2026-03-16T15:56:46Z</published>\n    <arxiv:comment>7 pages, 5 figures</arxiv:comment>\n    <arxiv:primary_category term='hep-ph'/>\n    <author>\n      <name>Damir Bečirević</name>\n    </author>\n    <author>\n      <name>Claire Chevallier</name>\n    </author>\n    <author>\n      <name>Svjetlana Faifer</name>\n    </author>\n    <author>\n      <name>Nejc Košnik</name>\n    </author>\n    <author>\n      <name>Lovre Pavičić</name>\n    </author>\n  </entry>"
}