TY - JOUR

T1 - Search for lepton number violating decays of $$ {\textrm{D}}_{\textrm{s}}^{+} $$ → h−h0e+e+

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 - Nikolaev, I. b.

AU - Мучной, Николай Юрьевич

PY - 2025/1/21

Y1 - 2025/1/21

N2 - Based on 7.33 fb−1 of e+e− collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search for the Majorana neutrino νm is conducted in the lepton-number-violating decays of → h−h0e+e+. Here, h− represents a K− or π−, and h0 represents a π0, or ϕ. No significant signal is observed, and the upper limits of their branching fractions at the 90% confidence level are determined to be ( → ϕπ−e+e+) < 6.9 × 10−5, ( → ϕK−e+e+) < 9.9 × 10−5, ( → π−e+e+) < 1.3 × 10−5, ( → K−e+e+) < 2.9 × 10−5, ( → π−π0e+e+) < 2.9 × 10−5 and ( → K−π0e+e+) < 3.4 × 10−5. The Majorana neutrino is searched for with different mass assumptions within the range [0.20, 0.80] GeV/c2 in the decay of → ϕe+νm with νm → π−e+, and the upper limits of the branching fractions at the 90% confidence level are at the level of 10−5–10−2, depending on the mass of the Majorana neutrino.

AB - Based on 7.33 fb−1 of e+e− collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search for the Majorana neutrino νm is conducted in the lepton-number-violating decays of → h−h0e+e+. Here, h− represents a K− or π−, and h0 represents a π0, or ϕ. No significant signal is observed, and the upper limits of their branching fractions at the 90% confidence level are determined to be ( → ϕπ−e+e+) < 6.9 × 10−5, ( → ϕK−e+e+) < 9.9 × 10−5, ( → π−e+e+) < 1.3 × 10−5, ( → K−e+e+) < 2.9 × 10−5, ( → π−π0e+e+) < 2.9 × 10−5 and ( → K−π0e+e+) < 3.4 × 10−5. The Majorana neutrino is searched for with different mass assumptions within the range [0.20, 0.80] GeV/c2 in the decay of → ϕe+νm with νm → π−e+, and the upper limits of the branching fractions at the 90% confidence level are at the level of 10−5–10−2, depending on the mass of the Majorana neutrino.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85217987901&origin=inward&txGid=efe7ccb3aafbc66a4e1a4a827f4b18f7

U2 - 10.1007/JHEP01(2025)109

DO - 10.1007/JHEP01(2025)109

M3 - Article

VL - 2025

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 1

M1 - 109

ER -