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Of Contact Interactions and Colliders

Abstract : The hierarchy of scales which would allow dimension-six contact interactions to parametrise New Physics may not be verified at colliders. Instead, we explore the feasability and usefulness of parametrising the high-energy tail of distributions at the LHC using form factors. We focus on the process pp -> l+l- in the presence of t (or s)-channel New Physics, guess a form factor from the partonic cross-section, and attempt to use data to constrain its coefficients, and the coefficients to constrain models. We find that our choice of form factor decribes t-channel exchange better than a contact interaction, and the coefficients in a particular model can be obtained from the partonic cross-section. We estimate bounds on the coefficients by fitting the form factors to available data. For the parametrisation corresponding to the contact interaction approximation, our expected bounds on the scale $\Lambda$ are within ~ 15% of the latest limits from the LHC experiments.
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Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Friday, October 24, 2014 - 11:02:32 AM
Last modification on : Friday, September 10, 2021 - 1:50:11 PM

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Sacha Davidson, S. Descotes-Genon, P. Verdier. Of Contact Interactions and Colliders. Physical Review D, American Physical Society, 2015, 91, pp.055031. ⟨10.1103/PhysRevD.91.055031⟩. ⟨in2p3-01077217⟩



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