Meson-baryon sigma terms in QCD Sum Rules

Abstract

We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent calculations. It is also found that the pion-Delta sigma term is as large as the pion-nucleon sigma term.Comment: 14 pages, 2 figures; extended discussion and added references; version to be published in Phys. Lett.