Identification techniques for highly boosted W bosons that decay into hadrons

TL;DR

This paper develops and evaluates algorithms to identify highly boosted W bosons decaying into hadrons, crucial for new physics searches at the LHC, and compares their performance with simulations.

Contribution

It introduces specific techniques for W jet identification applicable to other boson decays and measures their efficiency using CMS data at 8 TeV.

Findings

W tagging efficiency measured in CMS data

Comparison of data with Monte Carlo predictions

Algorithms applicable to Z and Higgs boson decays

Abstract

In searches for new physics in the energy regime of the LHC, it is becoming increasingly important to distinguish single-jet objects that originate from the merging of the decay products of W bosons produced with high transverse momenta from jets initiated by single partons. Algorithms are defined to identify such W jets for different signals of interest, using techniques that are also applicable to other decays of bosons to hadrons that result in a single jet, such as those from highly boosted Z and Higgs bosons. The efficiency for tagging W jets is measured in data collected with the CMS detector at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse femtobarns. The performance of W tagging in data is compared with predictions from several Monte Carlo simulators.