A search for a massless dark photon gamma' 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(Lambda(+)(c) -> p gamma') is determined to be 8.0 x 10(-5) at 90% confidence level.
Search for a massless dark photon in Λc+ -> pγ' decay
A. Amoroso;F. Bianchi;A. Bortone;M. Destefanis;F. De Mori;L. Fava;S. Garbolino;M. Greco;J. ???F. Hu;L. Lavezzi;M. Maggiora;S. Marcello;A. Rivetti;S. Sosio;S. Spataro;L. Yan;
2022-01-01
Abstract
A search for a massless dark photon gamma' 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(Lambda(+)(c) -> p gamma') is determined to be 8.0 x 10(-5) at 90% confidence level.
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