2024/10/25(Fri)
15:00 -16:30
視訊演講 Video Seminar [ Meeting Link / ID: 2514 934 4688 / Password: FridaySeminar24 ]
Title
Experimental searches for QCD instantons at the LHC
Speaker
Dr. Ynyr Harris (University of Bonn, ATLAS Collaboration)Abstract
QCD instantons are semi-classical solutions of the Yang-Mills equations that arise due to the non-trivial topology of the space of gluon field configurations. This topology causes a structure of the QCD vacuum that consists of infinitely many topological vacua. Instantons correspond to tunnels between these vacua, and have the effect of continually mixing them into a superposition. It was shown by ‘t Hooft that including instantons as zeroth-order corrections to amplitudes induces an effective vertex in QCD that violates chirality. More recent calculations of this amplitude in proton-proton collisions at the LHC suggest that the instanton-induced event should be observable in ATLAS data. This talk will present an ongoing ATLAS analysis that hopes to discover low-mass QCD instantons at the LHC. The limitations of this search will be discussed, and then new ideas involving (i) the high-mass regime, and (ii) the use of forward proton-tagging will be presented.
Language
演講語言 (Language): in English