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

How to pin down the C P quantum numbers of a Higgs boson in its τ decays at the LHC We investigate how the C P 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 Φ → τ - τ + . We use a method ( S. Berge and W. Bernreuther , Phys. Lett. B 671 , 470 ( 2009 ). PYLBAJ 0370-2693 10.1016/j.physletb.2008.12.065 ) 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 C P -even and -odd Higgs boson and/or between Higgs boson(s) with C P -conserving and C P -violating couplings after several years of high-luminosity runs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

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

Physical Review D , Volume 84 (11) – Dec 1, 2011
14 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
1550-2368
DOI
10.1103/PhysRevD.84.116003
Publisher site
See Article on Publisher Site

Abstract

We investigate how the C P 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 Φ → τ - τ + . We use a method ( S. Berge and W. Bernreuther , Phys. Lett. B 671 , 470 ( 2009 ). PYLBAJ 0370-2693 10.1016/j.physletb.2008.12.065 ) 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 C P -even and -odd Higgs boson and/or between Higgs boson(s) with C P -conserving and C P -violating couplings after several years of high-luminosity runs.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Dec 1, 2011

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