Jets form one of the most important quantities to reconstruct at a hadron collider and many searches and measurements are dominated by the uncertainties on the jet energy scale. The procedure of calibrating ATLAS Anti-kt R=0.4 jets using in situ techniques and extrapolation to other radii is presented. Missing transverse momentum (MET) is used to infer the presence of high transverse momentum...
The talk will report on the most recent studies concerning the performance of jet and missing transverse energy reconstruction at CMS
Searches for new heavy resonances, supersymmetric particles, heavy vector quarks, and measurements of highly boosted Standard Model processes increasingly rely on large radius jets to reconstruct hadronically decaying boosted objects. The reconstruction of these along with their calibration of both mass and transverse momentum will be discussed. In situ techniques are then used to derive...
With the High-Luminosity (HL) LHC ahead, bringing the discrimination power of jet-substructure-based jet tagging algorithms to Level 1 trigger selection will be a major asset to guarantee an optimal usage of the limited trigger resources at downstream steps. To do so, the CMS experiment is intensively investigating the possibility of running the particle-flow (PF) reconstruction algorithm on...
In order to mitigate the effect of pile-up and to improve the resolution of substructure variables for highly boosted hadronically decaying particles various grooming techniques and jet inputs are evaluated. Track assisted techniques are also introduced to improve over the calorimeter limited granularity in the highest boosted regime. Boosted Higgs bosons decaying into two collimated b-jets...
Pileup has a significant impact on jet reconstruction and on the ability to identify hadronically decaying boosted objects. The Constituent Subtraction is a pileup mitigation method which operates at the level of jet or event constituents and which is successfully used by experiments at the LHC. This talk explores its application on the event constituents before jet clustering. Several...
The talk will report on the studies and techniques developed at CMS for the pileup mitigation.
Tagging algorithms that discriminate between massive large-R QCD jets and large-R jets that capture the decays of W/Z boson or top quarks are developed. The methods of tagging these objects are described. In order to improve the boosted taggers performance and the precision on the tagging efficiency and rejection new in-situ techniques are applied. The precision obtained by applying the...
The talk will report on most recent results on tagger performance in data by the CMS collaboration
