Branching ratios for (p)over-barp annihilation at rest into two-body finalstates

Authors
Abele, A Adomeit, J Amsler, C Baker, CA Barnett, BM Batty, CJ Benayoun, M Bischoff, S Blum, P Braune, K Bugg, DV Case, T Crowe, KM Degener, T Doser, M Dunnweber, W Engelhardt, D Faessler, MA Giarritta, P Haddock, RP Heinsius, FH Heinzelmann, M Herbstrith, A Herz, M Hessey, NP 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, R Matthay, H McCrady, R Meier, J Meyer, CA Montanet, L Ouared, R Peters, K Pick, B Ratajczak, M Regenfus, C Roethel, W Spanier, S Stock, H Strassburger, C Strohbusch, U Suffert, M Suh, JS Thoma, U Tischhauser, M Uman, I Volcker, C Wallis-Plachner, S Walther, D Wiedner, U Wittmack, K Zou, BS
Citation
A. Abele et al., Branching ratios for (p)over-barp annihilation at rest into two-body finalstates, NUCL PHYS A, 679(3-4), 2001, pp. 563-576
Citations number
26
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
03759474 → ACNP
Volume
679
Issue
3-4
Year of publication
2001
Pages
563 - 576
Database
ISI
SICI code
0375-9474(20010101)679:3-4<563:BRF(AA>2.0.ZU;2-1
Abstract
Measurements of two-body branching ratios for pp annihilations at rest in l iquid and gaseous (12 rho (STP)) hydrogen are reported. Channels studied ar e (p) over barp --> pi (0)pi (0), pi (0)eta, (KSKL0)-K-0. K+K-. The branchi ng ratio for the pi (0)pi (0) channsl in liquid H-2 is measured to be (6.14 +/-0.40) x 10(-4). The results are compared with those from other experimen ts. The fraction of P-state annihilation for a range of target densities fr om 0.002 rho (STP) p to liquid H-2 is determined. Values obtained include 0 .11 +/- 0.02 in liquid H-2 and 0.48 +/- 0.04 in 12 rho (STP) H-2 gas. (C) 2 001 Elsevier Science B.V. All rights reserved.