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======== 視訊演講 Video Seminar ===============
Link: https://asmeet.webex.com/asmeet-en/j.php?MTID=ma1d860ec93bf1cc7c8c9098582a091eb
ID: 2514 934 4688
Password: FridaySeminar24

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【摘要】

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.