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

TL;DR

This paper investigates the intrinsic charm content of the nucleon using an extended chiral constituent quark model, calculating probabilities of charm-anticharm pairs and the charmness-nucleon sigma term, aligning with other theoretical predictions.

Contribution

It introduces a novel calculation of intrinsic charm in the nucleon within an extended chiral quark model using the $^{3}$P$_{0}$ mechanism, providing new quantitative predictions.

Findings

Predicted probability of $c ar{c}$ in the nucleon

Calculated charmness-nucleon sigma term

Results consistent with other theoretical approaches

Abstract

In the extended chiral constituent quark model, the intrinsic $c \bar{c}$ 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 {\it via} the $^{3}$P$_{0}$ mechanism. Predictions for the probability of the $c \bar{c}$ 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.