Hidden-Beauty Broad Resonance $Y_b(10890)$ in Thermal QCD

TL;DR

This paper investigates the temperature dependence of the mass and pole residue of the $Y_b(10890)$ resonance using QCD sum rules, revealing significant decreases near the critical temperature.

Contribution

It introduces a finite-temperature QCD sum rules analysis of the $Y_b$ resonance as a tetraquark, including condensates up to dimension six, to study its thermal behavior.

Findings

Mass and pole residue decrease significantly near $T_c$

At $T_c$, mass drops to 87% of vacuum value

Pole residue drops to 44% of vacuum value

Abstract

In this work, the mass and pole residue of resonance $Y_b$ is studied by using QCD sum rules approach at finite temperature. Resonance $Y_b$ is described by a diquark-antidiquark tetraquark current, and contributions to operator product expansion are calculated by including QCD condensates up to dimension six. Temperature dependences of the mass $m_{Y_b}$ and the pole residue $\lambda_{Y_b}$ are investigated. It is seen that near a critical temperature $(T_c\simeq190~\mathrm{MeV})$, the values of $m_{Y_b}$ and $\lambda_{Y_b}$ are decreased to $87\%$, and to $44\%$ of their values at vacuum.