0000000000016312
AUTHOR
R. Born
Dipolar and quadrupolar freezing in (NaCN)1−x(KCN)x
A QCD calculation of the pion scalar form factor (σ-term)
Abstract The scalar pion form factor (also known as σ-term) is calculated from the QCD Green function approach. The result at q 2 = 0 is in excellent agreement with the PCAC prediction. We also present the q 2 -dependence of the form factor which allows us to obtain the scalar radius of the pion as 〈 r 2 〉 π s = 12.6 ± 1.3 GeV −2 .