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Nonresonant Searches for Axionlike Particles at the LHC.

M B Gavela1,2, J M No1,2, V Sanz3

  • 1Departamento de Fisica Teorica, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid, Spain.

Physical Review Letters
|February 22, 2020
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Summary

This study introduces a novel collider search for axionlike particles (ALPs) and pseudo-Goldstone bosons. New limits on ALP couplings to gauge bosons were derived using LHC data, exploring uncharted parameter space.

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Area of Science:

  • High-energy physics
  • Particle physics
  • Collider physics

Background:

  • Axionlike particles (ALPs) and pseudo-Goldstone bosons are hypothetical particles beyond the Standard Model.
  • Their interactions with Standard Model particles, particularly gauge bosons, are crucial for detection.
  • Collider experiments offer a unique environment to probe these interactions.

Purpose of the Study:

  • To propose a new nonresonant search strategy for axionlike particles (ALPs) at particle colliders.
  • To derive new limits on the couplings of ALPs to Standard Model gauge bosons.
  • To explore previously uninvestigated regions of the ALP parameter space.

Main Methods:

  • Utilizing the derivative nature of ALP interactions with Standard Model particles for nonresonant searches.
  • Analyzing 2→2 scattering processes where ALPs act as off-shell mediators in the s-channel.
  • Applying run 2 CMS public data to processes such as pp→ZZ, pp→γγ, and pp→jj.

Main Results:

  • New limits on ALP couplings to electroweak gauge bosons (ZZ, γγ, jj) were derived.
  • The search successfully probed previously unexplored areas of the ALP parameter space.
  • Demonstrated the efficacy of nonresonant collider searches for ALPs.

Conclusions:

  • The proposed nonresonant search strategy is a powerful tool for discovering ALPs at colliders.
  • Future searches can be extended to include ALP couplings to other electroweak bosons and the Higgs particle.
  • This approach opens new avenues for exploring fundamental physics beyond the Standard Model.