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PRODID:Faculty of Science and Engineering - Research
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SUMMARY:Dr Andrea Knue - Elusive romance of top-quark pairs observed at the LHC

DESCRIPTION;ENCODING=QUOTED-PRINTABLE: The top quark is the heaviest elementary particle known to date.=0D=0A=
With this very large mass come interesting consequences, like its extremely short lifetime.=0D=0A=
Unlike other quarks, which can form bound states, the top quarks lifetime does not allow for a stable bond.=0D=0A=
If two top quarks are produced almost at rest however, they can briefly exchange gluons before they then decay individually.=0D=0A=
This pseudo-bound state was already predicted in 1987, before the top quark was even discovered.=0D=0A=
It was thought to be impossible to measure this state at the LHC, as it constitutes less than 1% of the total production rate=0D=0A=
and is difficult to see in the data. With improved analysis techniques and theoretical predictions however,=0D=0A=
the CMS and ATLAS experiments have recently observed an excess of data close to the production threshold.=0D=0A=
This presentation will discuss these new measurements and shed some light on the fleeting connection between the two top quarks.
LOCATION:Online Only
DTSTART:20260527T140000
DTEND:20260527T150000
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