The differential cross sections for the γ(1S), γ(2S), and γ(3S) states and the γ(1S) polarization were measured. Fits of nonrelativistic quantumchromodynamics (NRQCD) matrix elements could describe the cross sections. The polarization systematic uncertainties were also indicated. The polarization measurement was made by fitting the shape of the uncorrected data.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physical Review Letters|
|State||Published - Apr 22 2002|
ASJC Scopus subject areas
- Physics and Astronomy(all)