2014/03/27 by The BABAR Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1403.7051
openalex publication_date 2014/03/27 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
We study the processes γγ→ K+ K- η and γγ→ K+ K- π0 using a data sample of 519 fb-1 recorded with the BaBar detector operating at the SLAC PEP-II asymmetric-energy e+ e- collider at center-of-mass energies at and near the Υ(nS) (n = 2,3,4) resonances. We observe ηc → K+ K- η and ηc → K+ K- π0 decays, measure their relative branching fraction, and perform a Dalitz plot analysis for each decay. We observe the K^*0(1430) → K η decay and measure its branching fraction relative to the K π decay mode to be \cal R(K^*0(1430)) = \frac\cal B(K^*0(1430) → K η)\cal B(K^*0(1430) → K π) = 0.092 ± 0.025+0.010-0.025. The ηc → K+ K- η and K^*0(1430) → K η results correspond to the first observations of these channels. The data also show evidence for ηc(2S) → K+ K- π0 and first evidence for ηc(2S) → K+ K- η.