Glueballs (Science and Technology)
Glueballs (Science and Technology)
Why In News:
China's BESIII (Beijing Spectrometer III) collaboration, the first experimental confirmation of a glueball, a particle made entirely of gluons with no quarks.
Source: The Hindu, Page 20, 10 August 2026, 'Glueball: matter of force'
What is a Glueball?
The strong nuclear force, which binds quarks inside protons and neutrons, is mediated by particles called gluons.
Unlike photons, which carry the electromagnetic force but do not interact with one another, gluons carry 'colour charge' and can attract and bind to each other.
A glueball is a particle made purely of bound gluons, with no quarks at all, predicted by Quantum Chromodynamics (QCD).
The Discovery
The particle X(2370), observed for some years, has now been confirmed as predominantly a 'pseudoscalar glueball'.
It was confirmed using the BESIII detector at the Beijing Electron-Positron Collider (BEPC II), after 15 years of research analysing billions of decay events.
Key Facts for Prelims
The Standard Model of Physics explains the basic building blocks of the universe.
It divides particles into two main types:
Matter particles (fermions): These make up everything around us (like atoms). They include quarks and leptons.
Force particles (bosons): These carry forces. Examples include photon (light), gluon (strong force), W/Z bosons (weak force), and Higgs boson.
There are six types of quarks: up, down, charm, strange, top, and bottom.
Protons and neutrons, which form the nucleus of atoms, are made from up and down quarks.