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Revealing the electroweak properties of a new scalar resonance

Revealing the electroweak properties of a new scalar resonance

One or more new heavy resonances may be discovered in experiments at the CERN Large Hadron Collider. In order to determine if such a resonance is the long-awaited Higgs boson, it is essential to pin down its spin, CP, and electroweak quantum numbers. Here we describe how to determine what role a newly-discovered neutral CP -even scalar plays in electroweak symmetry breaking, by measuring its relative decay rates into pairs of electroweak vector bosons: W ⁺ W ⁻, ZZ, γγ, and Zγ. With the data-driven assumption that electroweak symmetry breaking respects a remnant custodial symmetry, we perform a general analysis with operators up to dimension five. Remarkably, only three pure cases and one nontrivial mixed case need to be disambiguated, which can always be done if all four decay modes to electroweak vector bosons can be observed or constrained. We exhibit interesting special cases of Higgs look-alikes with nonstandard decay patterns, including a very suppressed branching to W ⁺ W ⁻ or very enhanced branchings to γγ and Zγ. Even if two vector boson branching fractions conform to Standard Model expectations for a Higgs doublet, measurements of the other two decay modes could unmask a Higgs imposter.

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1. High Energy Physics Division, Argonne National Laboratory, Argonne, IL, 60439, U.S.A.

   Ian Low

2. Department of Physics and Astronomy, Northwestern University, Evanston, IL, 60208, U.S.A.

   Ian Low

3. Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, U.S.A.

   Joseph Lykken

1. Ian Low
2. Joseph Lykken

Correspondence to Ian Low.

ArXiv ePrint: 1005.0872

Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Low, I., Lykken, J. Revealing the electroweak properties of a new scalar resonance. J. High Energ. Phys. 2010, 53 (2010). https://doi.org/10.1007/JHEP10(2010)053

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• Received: 17 May 2010

• Revised: 16 September 2010

• Accepted: 20 September 2010

• Published: 14 October 2010

• DOI: https://doi.org/10.1007/JHEP10(2010)053

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