Branching ratios for p ̄ p annihilation at rest into two-body final states
A. Abele, J. Adomeit, C. Amsler, C. A. Baker, B. M. Barnett, C. J. Batty, M. Benayoun, S. Bischoff, P. Blüm, K. Braune, D. V. Bugg, T. Casehttp://academic.research.microsoft.com/io.ashx?type=5&id=18224345&selfId1=0&selfId2=0&maxNumber=12&query=
Measurements of two-body branching ratios for p̄p annihilations at rest in liquid and gaseous (12ρSTP) hydrogen are reported. Channels studied are p̄p→π0π0,π0η, K0SK0L, K+K−. The branching ratio for the π0π0 channel in liquid H2 is measured to be (6.14±0.40)×10−4. The results are compared with those from other experiments. The fraction of P-state annihilation for a range of target densities from 0.002ρSTP to liquid H2 is determined. Values obtained include 0.11±0.02 in liquid H2 and 0.48±0.04 in 12ρSTP H2 gas.