Ultra-heavy Yukawa-bound states of 4th Generation at LHC

TL;DR

This paper investigates the properties and production mechanisms of ultra-heavy bound states of fourth-generation quarks at the LHC, emphasizing Yukawa interactions and novel isospin phenomena.

Contribution

It introduces the concept of Yukawa-bound states of 4th generation quarks, highlighting their production and decay modes, and the emergence of a new isospin symmetry.

Findings

Identification of a color octet, isosinglet vector meson $oldsymbol{ ext{omega}_8}$

Prediction of decay channels involving $oldsymbol{ ext{pi}_8^ ext{pm,0}}$ and W/Z bosons

Call for further detailed studies of 4th generation phenomena at LHC

Abstract

We present our study of bound states of the fourth generation quarks in the range of 500 to 700 GeV,where we expect binding energies are mainly of Yukawa origin, with QCD subdominant. Near degeneracy of their masses exhibits a new "isospin". We find the most interesting is the production of a color octet, isosinglet vector meson via $q\bar q \to \omega_8$. Its leading decay modes are $\pi_8^\pm W^\mp$, $\pi_8^0Z^0$, and constituent quark decay, with $q\bar q$ and $t\bar t'$ and $b\bar b'$ subdominant. The color octet, isovector pseudoscalar $\pi_8$ meson decays via constituent quark decay, or to $Wg$. This work calls for more detailed study of 4th generation phenomena at LHC.