Study of the quantum interference between singly- and doubly-resonant top quark production in $WbWb$ phase-space with the ATLAS detector.

Bianco G.
  Lunedì 12/09   14:00 - 19:00   Aula B - Maria Goeppert-Mayer   I - Fisica nucleare e subnucleare   Presentazione
The top quark is the heaviest known elementary particle of the Standard Model. Thanks to its particular properties, it allows to explore unique physics domains, inaccessible otherwise. One of them is the quantum interference between singly ($tW$) and doubly ($t\bar{t}$) resonant top quark production in proton-proton collisions, which can lead to identical $WbWb$ final states when an additional $b$-quark is radiated during a singly-resonant production. Studying this process is very important for a better knowledge of the Standard Model, but also to investigate some Beyond the Standard Model processes. In this contribution, the measurement of the particle level differential cross-section of the $WbWb$ production in the dilepton channel is provided, in order to better investigate the interference-sensitive regions of these processes. The measurement is performed using the full dataset collected by the ATLAS detector from proton-proton collisions at the LHC during Run-2. The differential cross-section is measured as a function of an interference-sensitive variable called minimaxmbl.