Measurement of Singly Cabibbo Suppressed Decays ?c+ ?p?+?- and ?c+ ?pK+K-

Abstract

Using 567 pb-1 of data collected with the BESIII detector at a center-of-mass energy of s=4.599 GeV, near the ?c+?c- threshold, we study the singly Cabibbo-suppressed decays ?c+?p?+?- and ?c+?pK+K-. By normalizing with respect to the Cabibbo-favored decay ?c+?pK-?+, we obtain ratios of branching fractions: [B(?c+?p?+?-)/B(?c+?pK-?+)]=(6.70±0.48±0.25)%, [B(?c+?p?)/B(?c+?pK-?+)]=(1.81±0.33±0.13)%, and [B(?c+?pK+Knon-?-)/B(?c+?pK-?+)]=(9.36±2.22±0.71)×10-3, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay ?c+?p?+?- is observed for the first time, and the precision of the branching fraction for ?c+?pK+Knon-?- and ?c+?p? is significantly improved. © 2016 American Physical Society.