New predictions on the mass of the 1−+ light hybrid meson from QCD sum rules

Abstract

Abstract: We calculate the coefficients of the dimension-8 quark and gluon condensates in the current-current correlator of 1−+ light hybrid current gq¯xγνiGμνxqx$$ g\overline{q}(x){\gamma}_{u }i{G}_{\mu u }(x)q(x) $$. With inclusion of these higher-power corrections and updating the input parameters, we re-analyze the mass of the 1−+ light hybrid meson from Monte-Carlo based QCD sum rules. Considering the possible violation of factorization of higher dimensional condensates and variation of 〈g3G3〉, we obtain a conservative mass range 1.72-2.60 GeV, which favors π1(2015) as a better hybrid candidate compared with π1(1600) and π1(1400).