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Öğe Measurement of the branching fraction for ? (3686) ?? KS0 KS0(American Physical Society, 2021) Ablikim M.; Achasov M.N.; Adlarson P.; Ahmed S.; Albrecht M.; Aliberti R.; Çetin, Serkant Ali; Kolcu, Onur BuğraAnalyzing (448.1±2.9)×106 ?(3686) events collected with the BESIII detector at the BEPCII collider, the ?(3686)??KS0KS0 decay is observed for the first time. The branching fraction for this decay is determined to be B?(3686)??KS0KS0=(7.04±0.39±0.36)×10-5, where the first uncertainty is statistical and the second is systematic.Öğe Observation of the decay ?(3686) ? ? ?? ¯ + and measurement of its angular distribution(Springer link, 2022) Ablikim M.; Achasov M.N.; Adlarson P.; Albrecht M.; Aliberti R.; Amoroso A.; An M.R.; An Q.; Bai X.H.; Bai Y.; Bakina O.; Baldini Ferroli R.; Çetin, Serkant Ali; Kolcu, Onur BuğraUsing (448.1 ± 2.9) × 106?(3686) events collected with the BESIII detector at the BEPCII collider, the decay ?(3686) ?? ?? ¯ + is observed for the first time with a branching fraction of (2.82 ± 0.04stat.± 0.08syst.) × 10?4, and the angular parameter ??? is measured to be 0.96 ± 0.09stat.± 0.03syst.. [Figure not available: see fulltext.] © 2022, The Author(s).Öğe Search for a massless dark photon in ?c+ ?p?? decay(American Physical Society, 2022) Ablikim M.; Achasov M.N; Adlarson P.; Albrecht M.; Aliberti R.; Amoroso A.; Çetin, Serkant Ali; Kolcu, Onur BuğraA search for a massless dark photon ?? is conducted using 4.5 fb-1 of e+e- collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. No significant signal is observed, and the upper limit on the branching fraction B(?c+?p??) is determined to be 8.0×10-5 at 90% confidence level. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.