A massless particle beyond the Standard Model is searched for in the two-body decay Sigma(+) -> p+ invisible using (1.0087 +/- 0.0044) x 10(10) J/psi events collected at a center-of-mass energy of root s = 3.097 GeV with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction B(Sigma(+) -> p + invisible) is determined to be 3.2 x 10(-5) at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in hyperon decays which plays an important role in constraining new physics models.
Search for a massless particle beyond the Standard Model in the Σ+ → p + invisible decay
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
A massless particle beyond the Standard Model is searched for in the two-body decay Sigma(+) -> p+ invisible using (1.0087 +/- 0.0044) x 10(10) J/psi events collected at a center-of-mass energy of root s = 3.097 GeV with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction B(Sigma(+) -> p + invisible) is determined to be 3.2 x 10(-5) at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in hyperon decays which plays an important role in constraining new physics models.File in questo prodotto:
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