Running electroweak couplings as a probe of new physics

Daniele S M Alves, Jamison Galloway, Joshua T. Ruderman, Jonathan R. Walsh

    Research output: Contribution to journalArticle

    Abstract

    Abstract: The energy dependence of the electroweak gauge couplings has not been measured above the weak scale. We propose that percent-level measurements of the energy dependence of α<inf>1,2</inf> can be performed now at the LHC and at future higher energy hadron colliders. These measurements can be used to set limits on new particles with electroweak quantum numbers without relying on any assumptions about their decay properties. The shape of the high invariant mass spectrum of Drell-Yan, pp → Z<sup>*</sup>/γ<sup>*</sup> → ℓ<sup>+</sup>ℓ<sup>−</sup>, constrains α<inf>1,2</inf>(Q), and the shape of the high transverse mass distribution of pp → W<sup>*</sup> → ℓν constrains α<inf>2</inf>(Q). We use existing data to perform the first fits to α<inf>1,2</inf> above the weak scale. Percent-level measurements are possible because of high precision in theoretical predictions and existing experimental measurements. We show that the LHC already has the reach to improve upon electroweak precision tests for new particles that dominantly couple through their electroweak charges. The 14 TeV LHC is sensitive to the predicted Standard Model (SM) running of α<inf>2</inf>, and can show that α<inf>2</inf> decreases with energy at 2-3σ significance. A future 100 TeV proton-proton collider will have significant reach to measure running weak couplings, with sensitivity to the SM running of α<inf>2</inf> at 4-5σ and sensitivity to winos with masses up to ∼ 1.3 TeV at 2σ.

    Original languageEnglish (US)
    Article number7
    JournalJournal of High Energy Physics
    Volume2015
    Issue number2
    DOIs
    StatePublished - 2015

    Fingerprint

    physics
    probes
    protons
    energy
    sensitivity
    mass distribution
    mass spectra
    quantum numbers
    decay
    predictions

    Keywords

    • Beyond Standard Model
    • Renormalization Group

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Alves, D. S. M., Galloway, J., Ruderman, J. T., & Walsh, J. R. (2015). Running electroweak couplings as a probe of new physics. Journal of High Energy Physics, 2015(2), [7]. https://doi.org/10.1007/JHEP02(2015)007

    Running electroweak couplings as a probe of new physics. / Alves, Daniele S M; Galloway, Jamison; Ruderman, Joshua T.; Walsh, Jonathan R.

    In: Journal of High Energy Physics, Vol. 2015, No. 2, 7, 2015.

    Research output: Contribution to journalArticle

    Alves, DSM, Galloway, J, Ruderman, JT & Walsh, JR 2015, 'Running electroweak couplings as a probe of new physics', Journal of High Energy Physics, vol. 2015, no. 2, 7. https://doi.org/10.1007/JHEP02(2015)007
    Alves, Daniele S M ; Galloway, Jamison ; Ruderman, Joshua T. ; Walsh, Jonathan R. / Running electroweak couplings as a probe of new physics. In: Journal of High Energy Physics. 2015 ; Vol. 2015, No. 2.
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