XXVI DAE-BRNS High Energy Physics Symposium 2024

Measurement of differential cross section of tt¯ production in boosted phase space with the dileptonic final state at 13 TeV with CMS experiment

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Oral Top Quark and EW physics

Speaker

Ritik Saxena (Tata Inst. of Fundamental Research (IN))

Description

The top quark pair production ($t\overline{t}$) is an extremely vital process as that constitutes a major background for many new physics searches. Although it is a well-understood process, CMS and ATLAS experiments have reported a difference in the top quark momentum spectrum compared to theoretical predictions, particularly at large transverse momentum. We are measuring $t\overline{t}$ production cross section in final states with two light leptons targeting the phase space with highly energetic top quarks, leading to the merging of their decay products into large-radius jets, using the data collected by the CMS experiment at a center-of-mass energy of 13 TeV during LHC Run 2. A machine learning based method is developed to reconstruct energetic top quarks decaying to leptonic final states. In this talk, I will present the details of the top tagging method and share preliminary results of the measurement.