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Azimuthal Angular Correlation as a Boosted Top Jet Substructure.

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  • 1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.

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We introduce a new way to study boosted top quarks using W boson polarization. This method reveals a unique angular correlation, aiding in new physics searches and distinguishing top jets from background noise.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Top quarks are fundamental particles in the Standard Model.
  • Studying boosted top quarks is crucial for understanding high-energy collisions.
  • W boson polarization in top quark decays offers insights into new physics.

Purpose of the Study:

  • To propose a novel jet substructure observable for boosted top quarks.
  • To investigate the linear polarization of the W boson in top quark decay.
  • To develop a method for measuring top quark polarization and discriminating top jets.

Main Methods:

  • Applying Wigner's little group transformation to understand W boson polarization.
  • Developing an experimental observable based on transverse energy deposition asymmetry in top jets.
  • Utilizing numerical simulations to validate analytic predictions.

Main Results:

  • A unique cos2ϕ angular correlation is identified in the boosted regime, linked to W boson linear polarization.
  • The proposed observable does not require reconstruction of W decay products.
  • The observable's asymmetry degree correlates with top quark longitudinal polarization.

Conclusions:

  • The novel observable provides a sensitive probe for new physics in the top sector.
  • This method effectively distinguishes boosted top quark jets from background QCD jets.
  • The findings align with Standard Model predictions and offer a new tool for particle physics research.