Intrinsic charm content of the nucleon and charmness-nucleon sigma term

Abstract

In the extended chiral constituent quark model, the intrinsic $c\overline{c}$ content of the nucleon is investigated. The probabilities of the quark-antiquark components in the nucleon wave functions are calculated by taking the nucleon to be admixtures of three- and five-quark components, with the relevant transitions handled via the $^{3}{\mathit{P}}_{0}$ mechanism. Predictions for the probability of the $c\overline{c}$ in the nucleon wave function and the charmness-nucleon sigma term are presented. Our numerical results turn out to be consistent with the predictions from various other approaches reported in the literature.