Alladi Ramakrishnan Hall

Hadron Spectroscopy using Lattice QCD

Archana Radhakrishnan

TIFR

Quantum Chromodynamics (QCD), is so far the accepted to be the way to describe the strong interactions of hadrons, in terms of the interactions between quarks and gluons. Unfortunately, at relatively low energy scales relevant to the study of the spectrum of
hadrons, QCD cannot be studied with perturbation theory (successful in studying electro-weak interactions). Until recently, our understanding of the spectrum has been dominated by interpretation of experimental results using simplified models. Recent
developments in computational tools and methodology has made it possible to study hadron spectroscopy from first-principles QCD by using a numerical technique called ‘Lattice QCD’. This tool has improved our understanding of the hadron spectrum including
hadronic resonances. Lattice QCD calculations have been able to see and predict the so called exotic states. In this talk I will focus on the study of tetraquark states where four quarks interact strongly to form a bound state. The status of present
calculations and the need for further calculations will be outlined as will the impact of such calculations on experimental endeavors in the near future.