Pion-Pion Phase-Shifts and the Value of Quark-Antiquark Condensate in the Chiral Limit
Cavalcante, Isabela P. · Borges, J. Sá
Original · EN
We use low energy pion-pion phase-shifts in order to make distinction between the alternatives for the value of the quark-antiquark condensate B₀ in the chiral limit. We will consider the amplitude up to and including O(p⁴) contributions within the Standard and Generalized Chiral Perturbation Theory frameworks. They are unitarized by means of Padé approximants in order to fit experimental phase-shifts in the resonance region. As the best fits correspond to α= β= 1, we conclude that pion-pion phase-shift analysis favors the standard ChPT scenario, which assumes just one, large leading order parameter < q q >₀.
English translation
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