ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 90, p. -
Observation of J /ψ →p p ¯ a0 (980) at BESIII OBSERVATION of J /ψ →p p ¯ a0 (980) ... M. ABLIKIM et al.
© 2014 American Physical Society. Using 2.25×108J/ψ events collected with the BESIII detector at the BEPCII storage rings, we observe for the first time the process J/ψ→pp¯a0(980), a0(980)→π0η with a significance of 6.5σ (3.2σ including systematic uncertainties). The product branching fraction of J/ψ→pp¯a0(980)→pp¯π0η is measured to be (6.8±1.2±1.3)×10-5, where the first error is statistical and the second is systematic. This measurement provides information on the a0 production near threshold coupling to pp¯ and improves the understanding of the dynamics of J/ψ decays to four-body processes.