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    Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

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    Author
    Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; ...
    Date
    2020-11-04
    Source Title
    The Journal of High Energy Physics
    Publisher
    SPRINGER
    University of Melbourne Author/s
    Urquijo, Phillip; Barberio, Luigia; Taylor, Geoffrey; Ungaro, Francesca Consiglia; Shojaii, Seyed Ruhollah
    Affiliation
    School of Physics
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T. ,... Zwalinski, L. (2020). Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2020 (11), https://doi.org/10.1007/JHEP11(2020)005.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252262
    DOI
    10.1007/JHEP11(2020)005
    Abstract
    <jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.</jats:p>

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