Title：Spectroscopy of chimera baryons: Top partners of a composite Higgs model with Sp(4) gauge group
Time：2023/12/18 (Mon.) 12:30
Place：R517, New Physics Building, NTU

Abstract：
In the context of Composite Higgs Models, where the standard model Higgs is interpreted as a pseudo Nambu-Goldstone Boson emerging from a new strong sector, baryons formed by matters in different representations, known as chimera baryons, could serve as top partners. The chimera baryon sharing the same quantum number as the top quark can mix with it, effectively lifting the mass of the top quark. We report our results of the spectrum of low-lying chimera baryons in the quenched approximation on a Sp(4) gauge theory. We perform the spin and parity projections to separate the states, and study their mass hierarchy. Particularly, we investigate the chiral extrapolation of chimera baryon masses. To accomplish this, we use a fitting function inspired by QCD chiral Effective Field Theory. We employ Akaike Information Criterion to determine the best fit among different data sets. Additionally, we conduct a sense check on the fitting procedure, confirming its validity and reliability. Last, we present the continuum and massless limit of chimera baryon masses.