How to pin down the CP quantum numbers of a Higgs boson in its τ decays at the LHC

S. Berge, W. Bernreuther, B. Niepelt, and H. Spiesberger
Phys. Rev. D 84, 116003 – Published 29 December 2011

Abstract

We investigate how the CP quantum numbers of a neutral Higgs boson or spin-zero resonance Φ, produced at the CERN Large Hadron Collider, can be determined in its τ-pair decay mode Φττ+. We use a method [S. Berge and W. Bernreuther, Phys. Lett. B 671, 470 (2009).] based on the distributions of two angles and apply it to the major 1-prong τ decays. We show for the resulting dilepton, lepton-pion, and two-pion final states that appropriate selection cuts significantly enhance the discriminating power of these observables. From our analysis we conclude that, provided a Higgs boson will be found at the LHC, it appears feasible to collect the event numbers needed to discriminate between a CP-even and -odd Higgs boson and/or between Higgs boson(s) with CP-conserving and CP-violating couplings after several years of high-luminosity runs.

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  • Received 8 August 2011

DOI:https://doi.org/10.1103/PhysRevD.84.116003

© 2011 American Physical Society

Authors & Affiliations

S. Berge1,*, W. Bernreuther2,†, B. Niepelt1, and H. Spiesberger1,‡

  • 1Institut für Physik (WA THEP), Johannes Gutenberg-Universität, 55099 Mainz, Germany
  • 2Institut für Theoretische Physik, RWTH Aachen University, 52056 Aachen, Germany

  • *berge@uni-mainz.de
  • breuther@physik.rwth-aachen.de
  • spiesber@uni-mainz.de

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Issue

Vol. 84, Iss. 11 — 1 December 2011

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