CETUP* 2025

TALK: Low-Scale Quark-Lepton Unification in a Pati-Salam Framework

Jul 7, 2025, 10:45 AM

45m

Lead/Deadwood Middle School

Speaker

Sumit Biswas (Oklahoma State University)

Description

We propose a $E_6$-inspired Pati-Salam (PS) model that naturally accommodates multi-TeV leptoquark gauge bosons, $X_{\mu }$, while incorporating a softly broken $Z_2$ symmetry. Standard Model (SM) fermions are $Z_2$-even in this framework, whereas exotic fermions are $Z_2$-odd. An interesting feature of the model is that the PS gauge bosons are $Z_2$-odd, enabling them to couple exclusively between ordinary and exotic fermions, except in the right-handed down-type sector, where mixing arises due to the soft breaking of $Z_2$. This structure leads to helicity suppression of meson decays at the tree level, with unsuppressed contributions appearing only at the one-loop level, which allows a lower PS breaking scale. Such a scale offers exciting collider prospects, particularly for probing leptoquark gauge bosons, and the distinctive signature of vector-like down-type quark carrying a fractional baryon number of $\pm 2/3$.

Presentation materials

Cetup_2025__Low_scale_Pati_Salam.pdf