RADIATIVE PROTONIUM ANNIHILATION INTO GAMMA-GAMMA, GAMMA-PI-0, GAMMA-ETA, GAMMA-OMEGA AND GAMMA-ETA'

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 MONTANET L NOBLE A OULDSAADA F PETERS K PINTER G RAVNDAL S SALK J SANJARI AH SCHAFER E SCHMID B SCHMIDT P SPANIER S STRASSBURGER C STROHBUSCH U SUFFERT M URNER D VOLCKER C WALTER F WALTHER D WASSMER S WIEDNER U WINTER N ZOLL J ZUPANCIC C
Citation
C. Amsler et al., RADIATIVE PROTONIUM ANNIHILATION INTO GAMMA-GAMMA, GAMMA-PI-0, GAMMA-ETA, GAMMA-OMEGA AND GAMMA-ETA', Physics letters. Section B, 311(1-4), 1993, pp. 371-378
Citations number
13
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
311
Issue
1-4
Year of publication
1993
Pages
371 - 378
Database
ISI
SICI code
0370-2693(1993)311:1-4<371:RPAIGG>2.0.ZU;2-W
Abstract
Radiative ppBAR annihilation at rest into gammagamma, gammapi0, gammae ta, gammaomega and gammaeta' has been measured with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The bran ching ratios are B(gammapi0) = (44 +/- 4) x 10(-6), B(gammaeta) = (9.3 +/- 1.4) x 10(-6) and B(gammaomega) = (68 +/- 18) x 10(-6), respectiv ely. For B(gammagamma) and B(gammaeta') we find new upper limits of 0. 63 x 10(-6) and 12 x 10(-6) (95% CL), respectively.