Search for XYZ states in ? (1S) inclusive decays

Abstract

The branching fractions of the ? (1S) inclusive decays into final states with a J/? or a ?(2S) are measured with improved precision to be B(? (1S)?J/?+anything)=(5.25�0.13(stat)�0.25(syst))�10-4 and B(? (1S)??(2S)+anything)=(1.23�0.17(stat)�0.11(syst))�10-4. The first search for ? (1S) decays into XYZ states that decay into a J/? or a ?(2S) plus one or two charged tracks yields no significant signals for XYZ states in any of the examined decay modes, and upper limits on their production rates in ? (1S) inclusive decays are determined. � 2016 American Physical Society.