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    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 Buğra
    A 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.