The annihilation frequency of the reaction (p) over barp --> pi(0)pi(0) at rest in liquid hydrogen has been measured by the Obelix experiment by using different apparatus configurations and trigger conditions. The value obtained is f(pi(0)pi(0), LH) = (2.8 +/- 0.1(stat)+/-0.4(syst)) x 10(-4). With the same data samples, the pi(0) eta annihilation frequency has been determined to be, f(pi(0) eta, LH) = (0.9+/-0.2(stat)+/-0.1(syst)) x 10(-4). The results are discussed within the frame of the present experimental situation. RI Bonomi, Germano/G-4236-2010; Galli, Domenico/A-1606-2012; Villa, Mauro/C-9883-2009; Iazzi, Felice/F-4490-2012; Botta, Elena/G-9742-2012; Fabbri, Laura/H-3442-2012; Fontana, Andrea/I-4375-2012; Filippi, Alessandra/I-9530-2012
Protonium annihilation into pi(0)pi(0) at rest in a liquid hydrogen target
DE FALCO, ALESSANDRO;USAI, GIANLUCA;
2002-01-01
Abstract
The annihilation frequency of the reaction (p) over barp --> pi(0)pi(0) at rest in liquid hydrogen has been measured by the Obelix experiment by using different apparatus configurations and trigger conditions. The value obtained is f(pi(0)pi(0), LH) = (2.8 +/- 0.1(stat)+/-0.4(syst)) x 10(-4). With the same data samples, the pi(0) eta annihilation frequency has been determined to be, f(pi(0) eta, LH) = (0.9+/-0.2(stat)+/-0.1(syst)) x 10(-4). The results are discussed within the frame of the present experimental situation. RI Bonomi, Germano/G-4236-2010; Galli, Domenico/A-1606-2012; Villa, Mauro/C-9883-2009; Iazzi, Felice/F-4490-2012; Botta, Elena/G-9742-2012; Fabbri, Laura/H-3442-2012; Fontana, Andrea/I-4375-2012; Filippi, Alessandra/I-9530-2012
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