Study of the {chi}{sub 1} and {chi}{sub 2} charmonium states formed in {anti p}p annihilations
- Pennsylvania State Univ., University Park, PA (United States)
- INFN, Ferrara (Italy)
- Fermi National Accelerator Lab., Batavia, IL (United States); and others
The authors report on a study of the {sup 3}P{sub 1}({chi}{sub 1}) and {sup 3}P{sub 2}({chi}{sub 2}) 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 them to perform very precise measurements of the mass and the total width of the two resonances. From their measurement of the quantity {Gamma}(R {r_arrow} {anti p}p) {times} BR(R {r_arrow} J/{psi}{gamma}) {times} BR(J{psi} {r_arrow} e{sup +}e{sup {minus}}), using known branching ratios, the authors obtain: {Gamma}({chi}{sub 1} {r_arrow} {anti p}p) = (69 {+-} 13) eV; {Gamma}({chi}{sub 2} {r_arrow} {anti p}p) = (180 {+-} 31) eV.
- Research Organization:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AT03-76ER71019
- OSTI ID:
- 663247
- Report Number(s):
- DOE/ER/71019--T3-Pt.5; ON: DE98006387; BR: 35KA02000; ADJ-BR-RG
- Country of Publication:
- United States
- Language:
- English
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