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.
Protonium annihilation into pi^0 pi^0 at rest in a liquid hydrogen target
Bussa MP;BALESTRA, Ferruccio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;PANZIERI, Daniele;BOTTA, Elena;BRESSANI, Tullio;MARCELLO, Simonetta;
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.
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