Making use of QCD sum rules a lower bound is found which relates the electromagnetic polarizability αE and mean-square radius 〈rπ2〉 of charged pions through the intrinsic polarizability alpha_E = alpha_E − alpha 〈rπ2〉(3Mπ). We find that if present constraints on the QCD continuum (duality) threshold are accepted, this lower bound on the intrinsic polarizability αE is incompatible with some previous determinations of alpha_E and 〈rπ2〉.
Lower bound to the pion polarizability from QCD sum rules
Orlandini, Giuseppina;
1996-01-01
Abstract
Making use of QCD sum rules a lower bound is found which relates the electromagnetic polarizability αE and mean-square radius 〈rπ2〉 of charged pions through the intrinsic polarizability alpha_E = alpha_E − alpha 〈rπ2〉(3Mπ). We find that if present constraints on the QCD continuum (duality) threshold are accepted, this lower bound on the intrinsic polarizability αE is incompatible with some previous determinations of alpha_E and 〈rπ2〉.File in questo prodotto:
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