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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Physical Review D, American Physical Society, 2015, 91, pp.055031. 〈10.1103/PhysRevD.91.055031〉
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http://hal.in2p3.fr/in2p3-01077217
Contributeur : Dominique Girod <>
Soumis le : vendredi 24 octobre 2014 - 11:02:32
Dernière modification le : jeudi 15 mars 2018 - 11:40:08

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S. 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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