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.
|Number of pages||6|
|Journal||Physical Review Letters|
|Publication status||Published - 2002 Apr 22|
ASJC Scopus subject areas
- Physics and Astronomy(all)