Topical Seminar: Spectroscopy of chimera baryons: Top partners of a composite Higgs model with Sp(4) gauge group

por Paul Hsiao (Institute of Physics, National Yang Ming Chiao Tung University)

lunes 6 nov. 2023 12:00 → 13:00 Europe/Madrid

Primera-1-1-1 - Paterna. Seminario (IFIC)

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 through the see-saw mechanism. 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 (EFT). We employ Akaike Information Criterion (AIC) 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 massless-continuum limit of chimera baryon masses.