4.4 Article

Unitarity bounds on effective field theories at the LHC

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 4, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP04(2022)155

关键词

Beyond Standard Model; Effective Field Theories

资金

  1. U.S. Department of Energy [DE-SC0011640]
  2. U.S. Department of Energy (DOE) [DE-SC0011640] Funding Source: U.S. Department of Energy (DOE)

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Effective Field Theory (EFT) is a tool to compute observables in particle physics. When searching for EFT effects at colliders, it is important to consider self-consistency. We propose a new approach that incorporates parton distribution functions into the analysis, and provide evidence for the validity of EFT predictions in certain parameter spaces.
Effective Field Theory (EFT) extensions of the Standard Model are tools to compute observables (e.g. cross sections with partonic center-of-mass energy root(S) over cap) as a systematically improvable expansion suppressed by a new physics scale M. If one is interested in EFT predictions in the parameter space where M < root<(S)over cap>, concerns of self-consistency emerge, which can manifest as a violation of perturbative partial-wave unitarity. However, when we search for the effects of an EFT at a hadron collider with center-of-mass energy root S using an inclusive strategy, we typically do not have access to the event-byevent value of root(S) over cap. This motivates the need for a formalism that incorporates parton distribution functions into the perturbative partial-wave unitarity analysis. Developing such a framework and initiating an exploration of its implications is the goal of this work. Our approach opens up a potentially valid region of the EFT parameter space where M << root S. We provide evidence that there exist valid EFTs in this parameter space. The perturbative unitarity bounds are sensitive to the details of a given search, an effect we investigate by varying kinematic cuts.

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