“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 16460
School of Particles and Accelerator
  Title:   New Collider Searches for Axion-like Particles Coupling to Gluons
1.  Gholamhossein Haghighat
2.  Daruosh Haji Raissi
3.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  115010
  Vol.:  102
  Year:  2020
  Supported by:  IPM
Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons associated with spontaneously broken global symmetries emerging in many extensions of the Standard Model. Assuming the most general effective Lagrangian up to dimension-5 operators for an ALP interacting with the SM fields, we investigate for the first time the sensitivity of the LHC13 to the ALP production in association with a di-jet. This study is focused on light ALPs which appear as invisible particles at the detector. Performing a realistic detector simulation and deploying a multivariate technique to best discriminate the signal from backgrounds, we set expected upper bounds on the ALP coupling to gluons. A comprehensive set of background processes is considered, and it is shown that this process provides significant sensitivity to the ALP-gluon coupling and the resulting bound is more stringent than those already obtained at the LHC. We also present prospects for the HE-LHC27 and FCC-hh100 and show that these future colliders are able to improve the limits from the LHC by roughly one order of magnitude.

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