Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-03
Eur.Phys.J.C11:501-506,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 fgures, latex. More discussions on the Sudakov effect added, references added. To appear in European Physical Jour
Scientific paper
10.1007/s100520050650
Non-leading contribution to the pion electromagnetic form factor which comes from the pion twist-3 wave function is analyzed in the modified hard scattering approach (MHSA) proposed by Li and Sterman. This contribution is enhanced significantly due to bound state effect (the twist-3 wave function is independent of the fractional momentum carried by the parton and has a large factor $\sim m_\pi^2/m_0$ with $m_\pi$ being the pion meson mass and $m_0$ being the mean u- and d-quark masses). Consequently, although it is suppressed by the factor $1/Q^2$, the twist-3 contribution is comparable with and even larger than the leading twist (twist-2) contribution at intermediate energy region of $Q^2$ being $2 \sim 40 {GeV}^2$.
Cao Fu-Guang
Dai Yuan-Ben
Huang Chao-Shang
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