ANTIPROTON-PROTON ANNIHILATION AT REST INTO 2-BODY FINAL-STATES

Authors
AMSLER C ARMSTRONG DS AUGUSTIN I BAKER CA BARNETT BM BATTY CJ BEUCHERT K BIRIEN P BISTIRLICH J BLUM P BOSSINGHAM R BOSSY H BRAUNE K BROSE J BUGG DV BURCHELL M CASE T CHUNG SU COOPER A CROWE KM DIETZ HP VONDOMBROWSKI S DOSER M DUNNWEBER W ENGELHARDT D ENGLERT M FAESSLER MA FELIX C FOLGER G HACKMANN R HADDOCK RP HEINSIUS FH HESSEY NP HIDAS P ILLINGER P JAMNIK D JAVORFI Z KALINOWSKY H KAMMLE B KIEL T KISIEL J KLEMPT E KOBEL M KOCH H KOLO C KONIGSMANN K KUNZE M LANDUA R LUDEMANN J MATTHAEY H MERKEL M MERLO JP MEYER CA MEYERBERKHOUT U MONTANET L NOBLE A OULDSAADA F PETERS K PINTER G RAVNDAL S SANJARI AH SCHAFER E SCHMID B SCHMIDT P SPANIER S STRASSBURGER C STROHBUSCH U SUFFERT M URNER D VOLCKER C WALTER F WALTHER D WIEDNER U WINTER N ZOLL J ZUPANCIC C
Citation
C. Amsler et al., ANTIPROTON-PROTON ANNIHILATION AT REST INTO 2-BODY FINAL-STATES, Zeitschrift fur Physik. C, Particles and fields, 58(2), 1993, pp. 175-189
Citations number
46
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
58
Issue
2
Year of publication
1993
Pages
175 - 189
Database
ISI
SICI code
0170-9739(1993)58:2<175:AAARI2>2.0.ZU;2-9
Abstract
We report measurements of branching ratios for production of a series of two meson final states in ppBAR annihilations at rest in liquid hyd rogen. We find: BR(ppBAR-->pi+pi-) = (3.07 +/- 0.13) . 10(-3) BR(ppBAR -->K+K-) = (0.99 +/- 0.05) . 10(-3) BR(ppBAR-->pi0pi0) = (6.93 +/- 0.4 3) . 10(-4) BR(ppBAR-->pi0eta) = (2.12 +/- 0.12) . 10(-4) BR(ppBAR-->p i0omega) = (5.73 +/- 0.47) . 10(-3) BR(ppBAR-->pi0eta') = (1.23 +/- 0. 13) . 10(-4) BR(ppBAR-->etaeta) = (1.64 +/- 0.10) . 10(-4) BR(ppBAR--> etaomega) = (1.51 +/- 0.12) . 10(-2) BR(ppBAR-->etaeta') = (2.16 +/- 0 .25) . 10(-4) BR(ppBAR-->omegaomega) = (3.32 +/- 0.34) . 10(-2) BR(ppB AR-->(omegaeta') = (0.78 +/- 0.08) . 10(-2) These are the first measur ements of the channels etaeta' and omegaeta' and in almost all the oth er channels are more precise than previous results. We also obtain, in a more precise fashion, the following ratios of branching ratios: K+K -/pi+pi- = 0.323 +/- 0.013, pi0eta'/pi0eta = 0.548 +/- 0.056, etaeta'/ etaeta = 1.31 +/- 0.15, omegaeta'/omegaeta = 0.515 +/- 0.040, pi0eta/p i0pi0 = 0.303 +/- 0.010, etaeta/pi0pi0 = 0.232 +/- 0.011 and pi0omega/ etaomega = 0.377 +/- 0.012. The measurements are made for different et a and eta' decays, and we thus obtain GAMMA(eta-->3pi0)/GAMMA(eta-->ga mmagamma) = 0.841 +/- 0.034, and GAMMA(eta'-->gammagamma)/GAMMA(eta'-- >pi0pi0pi) = 0.091 +/- 0.009.