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SUMMARY:Overview of quark gluon tagging - Aaron O'Neill (University of Oxf
 ord)
DTSTART:20210525T150000Z
DTEND:20210525T160000Z
UID:TALK158548@talks.cam.ac.uk
CONTACT:William Fawcett
DESCRIPTION:\nThe ability to distinguish quark-initiated jets from those s
 eeded by gluons would greatly enhance the physics potential of the LHC\, i
 ncluding searches for BSM physics and measurements of the Standard Model. 
 This long-standing puzzle has had many techniques and methods applied to i
 t and in this seminar the various approaches over the years at ATLAS and C
 MS are summarised.  \n\nPrevious efforts used variables that aimed to expl
 oit the observable differences between quark and gluon jets\; including\, 
 but by no means limited to\, the charged track multiplicity. Quantities wi
 th the most separation power are often combined to form two dimensional li
 kelihoods which are more performant. However\, in the modern age of machin
 e learning techniques quark gluon-tagging is an ideal use case for these s
 ophisticated methods.  \n\nHow will the power of these discriminators incr
 ease into Run 3 of the LHC and beyond to the High Luminosity LHC? Is the s
 eparation of these highly entangled theoretical abstractions even a reason
 ably achievable goal experimentally? 
LOCATION:https://cern.zoom.us/j/61144924828?pwd=WDB6QmFCMEZiSEN5Q0k2aklWSj
 k5Zz09
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