Details

Autor(en) / Beteiligte

• Ablikim, M.
• Achasov, M. N.
• Adlarson, P.
• Afedulidis, O.
• Ai, X. C.
• Aliberti, R.
• Amoroso, A.
• An, Q.
• Bai, Y.
• Bakina, O.
• Balossino, I.
• Ban, Y.
• Bao, H.-R.
• Batozskaya, V.
• Begzsuren, K.
• Berger, N.
• Berlowski, M.
• Bertani, M.
• Bettoni, D.
• Bianchi, F.
• Bianco, E.
• Bortone, A.
• Boyko, I.
• Briere, R. A.
• Brueggemann, A.
• Cai, H.
• Cai, X.
• Calcaterra, A.
• Cao, G. F.
• Cao, N.
• Cetin, S. A.
• Chang, J. F.
• Chang, W. L.
• Che, G. R.
• Chelkov, G.
• Chen, C.
• Chen, C. H.
• Chen, Chao
• Chen, G.
• Chen, H. S.
• Chen, M. L.
• Chen, S. J.
• Chen, S. L.
• Chen, S. M.
• Chen, T.
• Chen, X. R.
• Chen, X. T.
• Chen, Y. B.
• Chen, Y. Q.
• Chen, Z. J.
• Chen, Z. Y.
• Choi, S. K.
• Chu, X.
• Cibinetto, G.
• Cossio, F.
• Cui, J. J.
• Dai, H. L.
• Dai, J. P.
• Dbeyssi, A.
• de Boer, R. E.
• Dedovich, D.
• Deng, C. Q.
• Deng, Z. Y.
• Denig, A.
• Denysenko, I.
• Destefanis, M.
• De Mori, F.
• Ding, B.
• Ding, X. X.
• Ding, Y.
• Dong, J.
• Dong, L. Y.
• Dong, M. Y.
• Dong, X.
• Du, M. C.
• Du, S. X.
• Duan, Z. H.
• Egorov, P.
• Fan, Y. H.
• Fang, J.
• Fang, S. S.
• Fang, W. X.
• Fang, Y.
• Fang, Y. Q.
• Farinelli, R.
• Fava, L.
• Feldbauer, F.
• Felici, G.
• Feng, C. Q.
• Feng, J. H.
• Feng, Y. T.
• Fischer, K.
• Fritsch, M.
• Fu, C. D.
• Fu, J. L.
• Fu, Y. W.
• Gao, H.
• Gao, Y. N.

Titel

Search for Rare Decays of D s + to Final States π + e + e − , ρ + e + e − , π + π 0 e + e − , K + π 0 e + e − , and K S 0 π + e + e

Ist Teil von

• Physical review letters, 2024-09, Vol.133 (12), Article 121801

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2024

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Using 7.33 fb − 1 of e + e − collision data collected by the BESIII detector at center-of-mass energies in the range of s = 4.128 – 4.226 GeV , we search for the rare decays D s + → h + ( h 0 ) e + e − , where h represents a kaon or pion. By requiring the e + e − invariant mass to be consistent with a ϕ ( 1020 ) , 0.98 < M ( e + e − ) < 1.04 GeV / c 2 , the decay D s + → π + ϕ , ϕ → e + e − is observed with a statistical significance of 7.8 σ , and evidence for the decay D s + → ρ + ϕ , ϕ → e + e − is found for the first time with a statistical significance of 4.4 σ . The decay branching fractions are measured to be B ( D s + → π + ϕ , ϕ → e + e − ) = ( 1.1 7 − 0.21 + 0.23 ± 0.03 ) × 10 − 5 , and B ( D s + → ρ + ϕ , ϕ → e + e − ) = ( 2.4 4 − 0.62 + 0.67 ± 0.16 ) × 10 − 5 , where the first uncertainties are statistical and the second systematic. No significant signals for the three four-body decays of D s + → π + π 0 e + e − , D s + → K + π 0 e + e − , and D s + → K S 0 π + e + e − are observed. For D s + → π + π 0 e + e − , the ϕ mass region is vetoed to minimize the long-distance effects. The 90% confidence level upper limits set on the branching fractions of these decays are in the range of ( 7.0 – 8.1 ) × 10 − 5 . Published by the American Physical Society 2024