TY - JOUR

T1 - Search for a massless particle beyond the Standard Model in the Σ+ → p + invisible decay

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M.n.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Ai, X.c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

AU - Bao, H.-R.

AU - Batozskaya, V.

AU - Begzsuren, K.

AU - Berger, N.

AU - Berlowski, M.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bianco, E.

AU - Bortone, A.

AU - Briere, R.a.

AU - Brueggemann, A.

AU - Cai, H.

AU - Nikolaev, I.b.

AU - Мучной, Николай Юрьевич

PY - 2024/5/1

Y1 - 2024/5/1

N2 - A massless particle beyond the Standard Model is searched for in the two-body decay using events collected at a center-of-mass energy of with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction is determined to be 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.

AB - A massless particle beyond the Standard Model is searched for in the two-body decay using events collected at a center-of-mass energy of with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction is determined to be 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.

U2 - 10.1016/j.physletb.2024.138614

DO - 10.1016/j.physletb.2024.138614

M3 - Article

VL - 852

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

M1 - 138614

ER -