Speaker:
dr hab. Andrzej Siodmok,  Peter Baron

Title: Novel approach to measure quark/gluon jets at the LHC


Abstract:
Experimentally, partons (quarks and gluons) can be studied by analysing so-called jets (collimated spray of particles and energy) whose kinematic properties reflect those of an initiating (unmeasurable) parton. With a suitable jet definition, one can connect jet measurements made on clusters of hadrons to calculations made on clusters of partons. More ambitiously, one can try to tag jets with a suitably-defined flavour label, thereby enhancing the fraction of, say, quark-tagged jets over gluon-tagged jets. Being able to distinguish quark jets from gluon jets on an event-by-event basis could significantly enhance the reach for many new physics searches at the Large Hadron Collider.

The talk consists of two parts:
1) introduction to the problem presenting some recent results by Andrzej Siodmok
and
2) construction of new robust observables which are sensitive to the differences between quark and gluon jets by Petr Baron.