Rigorous pion electromagnetic form factor behavior in the spacelike region
نویسندگان
چکیده
منابع مشابه
Large - Q 2 behavior of the pion electromagnetic form factor *
We study the largeQ 2 behavior of the electromagnetic form factor of the pion, which is viewed as a quarkantiquark bound state in a (nongauge) quantum field theory. When the pion's Bethe-Salpeter wave function is expanded in 0(4) partial waves, it is found that the information needed about the partial-wave amplitudes is their scaling behavior at large momentum and the locations of their poles i...
متن کاملConstraining the low-energy pion electromagnetic form factor with spacelike data
The pionic contribution to the g−2 of the muon involves a certain integral over the modulus squared of Fπ(t), the electromagnetic form factor of the pion. We extend techniques that use cut-plane analyticity properties of Fπ(t) in order to account for present day estimates of the pionic contribution and experimental information at a finite number of points in the spacelike region. Using data fro...
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We calculate the electromagnetic pion form factor at intermediate spacelike momentum transfer from the QCD sum rule for the correlation function of two pseudoscalar interpolating fields and the electromagnetic current. This correlator receives essential contributions from direct (i.e. small-scale) instantons, which we evaluate under the assumption of an instanton size distribution consistent wi...
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The Standard Model prediction for the magnetic moment of the muon requires a determination of the electromagnetic form factor of the pion at high precision. It is shown that the recent progress in ππ scattering allows us to obtain an accurate representation of this form factor on the basis of the data on e+e− → π+π−. The same method also applies to the form factor of the weak vector current, wh...
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Temperature effects on the electromagnetic couplings of pions in hot hadronic matter are studied with an effective chiral Lagrangian. We show that the Ward-Takahashi identity is satisfied at non-zero temperature in the soft pion limit. The in-medium electromagnetic form factor of the pion is obtained in the time-like region and shown to be reduced in magnitude, especially near the vector-meson ...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2011
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.83.028201