Published March 30, 1992 | Version v1
Journal article

Study of the χ1 and χ2 charmonium states formed in anti pp annihilations

Description

We report on a study of the χ1(3P1) and χ2(3P2) states of charmonium formed in antiproton-proton annihilations. An energy scan through the resonances, performed with a very narrow momentum-band beam of antiprotons intersecting a hydrogen jet target, enables us to perform very precise measurements of the mass and the total width of the two resonances. From a sample of 513 χ1 and 585 χ2 events we find Mχ1=(3510.53±0.13) MeV/c2, Mχ2=(3556.15±0.14) MeV/c2, Γχ1=(0.88±0.14) MeV and Γχ2=(1.98±0.18) MeV. From our measurement of the quantity Γ(R→anti pp)xBR(R→J/ψγ)xBR(J/ψ→e+e-), using known branching ratios, we obtain Γ(χ1→anti pp)=(69±13) eV and Γ(χ2→anti pp)=(180±31) eV. (orig.)

Additional details

Publishing Information

Journal Title
Nuclear Physics. B, Particle Physics
Journal Volume
373
Journal Issue
1
Series
Nucl. Phys., B Part. Phys.
Journal Page Range
35-54
ISSN
0550-3213
CODEN
NUPBB