摘要
Quarks and gluons are elementary particles,according to Quantum-chromo Dynamics(QCD),to bound together to form the protons,neutrons and other hadrons.Due to the nature of the strong force in QCD,quarks and gluons are not free particles,rather manifesting themselves in high energy collisions by a bunch of energetic hadrons,dubbed as"jets".Thus,discriminating a quark from a gluon possesses a significant challenge because of the limited information and poor understanding of the hadronic jets.Yet,it is of fundamental importance to distinguish a quark from a gluon,not only because of the need to understand the QCD to a deeper level,but also the fact that quarks and gluons may lead to different characteristics coming from electroweak interactions and new physics beyond the Standard Model(SM)of the elementary particle physics.This has been known as one of the most important,but challenging tasks at hadron colliders,such as the Large Hadron Collider(LHC).
