Theory seminar: Giovanni Stagnitto, "Flavoured jets and particles at the LHC"

L017 (CWI)




At the Large Hadron Collider (LHC) at CERN, identifying heavy hadrons  from bottom or charm fragmentation is critical to pinpoint specific scattering processes and reject backgrounds; such signatures are crucial for precision phenomenology, PDF determination and search for new physics. Measurements of processes involving heavy hadrons are usually differential in the momentum of the identified particle, requiring the introduction of a non-perturbative fragmentation function, or they rely on flavoured jets, which are jets consistent with being initiated by a 
heavy-flavour quark. After a general introduction, I will discuss how to account for the presence of an identified particle in the antenna subtraction formalism for next-to-next-to-leading order (NNLO) QCD calculations, by first focusing on electron-positron annihilation and then by reporting on work in progress to extend the formalism to hadron collisions. I will then move to flavoured jets, by presenting a new approach, the flavour dressing algorithm, which allows for an infrared and collinear safe way of assigning flavour to any jet. Finally, I will present preliminary results for NNLO QCD predictions for Z+c-jet production with LHCb fiducial cuts.

Organized by

Andrea Pelloni, Tanjona Rabemananjara, Tommaso Giani