Strangeness and meson-nucleon sigma terms
Harleen Dahiya, Neetika Sharma
TL;DR
This paper extends the chiral constituent quark model to analyze the nucleon's flavor structure and sigma terms, highlighting the role of the quark sea, chiral symmetry breaking, and hidden strangeness, aligning with recent experimental data.
Contribution
It introduces an extended $ ext{χ}$CQM approach to compute meson-nucleon sigma terms and investigates the hidden strangeness component in the nucleon.
Findings
Large quark sea contributions to sigma terms
Significant hidden strangeness component consistent with experiments
Chiral and SU(3) symmetry breaking effects are crucial
Abstract
The chiral constituent quark model (CQM) has been extended to calculate the flavor structure of the nucleon through the meson-nucleon sigma terms which have large contributions from the quark sea and are greatly affected by chiral symmetry breaking and SU(3) symmetry breaking. The hidden strangeness component in the nucleon has also been investigated and its significant contribution is found to be consistent with the recent available experimental observations.
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