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Article
Title	Branching ratios for pbarp annihilation at rest into two-body final states
Author(s)	Abele, A ; Adomeit, J ; Amsler, Claude ; Baker, C A ; Barnett, B M ; Batty, C J ; Benayoun, M ; Bischoff, S ; Blüm, P ; Braune, K ; Bugg, D V ; Case, T ; Crowe, K M ; Degener, T ; Doser, Michael ; Dünnweber, W ; Engelhardt, D ; Faessler, M A ; Giarritta, P ; Haddock, R P ; Heinsius, F H ; Heinzelmann, M ; Herbstrith, A ; Herz, M ; Hessey, N P ; Hidas, P ; Hodd, C ; Holtzhaussen, C ; Jamnik, D ; Kalinowsky, H ; Kammel, P ; Kisiel, J ; Klempt, E ; Koch, H ; Kunze, M ; Kurilla, U ; Lakata, M ; Landua, Rolf (CERN) ; Matthäy, H ; McCrady, R ; Meier, J ; Meyer, C A ; Montanet, Lucien ; Ouared, R ; Peters, K ; Pick, B ; Ratajczak, M ; Regenfus, C ; Röthel, W ; Spanier, S ; Stöck, H ; Strassburger, C ; Strohbusch, U ; Suffert, Martin ; Suh, J S ; Thoma, U ; Tischhäuser, M ; Uman, I ; Völcker, C ; Wallis-Plachner, S ; Walther, D ; Wiedner, U ; Wittmack, K ; Zou, B S
Publication	2001
In:	Nucl. Phys. A 679 (2001) 563-576
DOI	10.1016/S0375-9474(00)00361-4
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEAR ; PS197
Abstract	Measurements of two-body branching ratios for pbarp annihilations at rest in liquid and gaseous (12 rho sub S sub T sub P) hydrogen are reported. Channels studied are pbarp-> pi sup 0 pi sup 0 ,pi sup 0 eta, K sup 0 sub S K sup 0 sub L , K sup + K sup -. The branching ratio for the pi sup 0 pi sup 0 channel in liquid H sub 2 is measured to be (6.14+-0.40)x10 sup - sup 4. The results are compared with those from other experiments. The fraction of P-state annihilation for a range of target densities from 0.002 rho sub S sub T sub P to liquid H sub 2 is determined. Values obtained include 0.11+-0.02 in liquid H sub 2 and 0.48+-0.04 in 12 rho sub S sub T sub P H sub 2 gas.

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