Abstract
We study the interactions of axion-like particles (ALPs) with the Standard Model particles, aiming to probe their phenomenology via non-resonant searches at the LHC. These interactions are mediated by higher dimensional effective operators within two possible frameworks of linearly and non-linearly realised electroweak symmetry breaking. We consider the ALPs to be light enough to be produced on-shell and exploit their derivative couplings with the SM Higgs boson and the gauge bosons. We will use the high momentum transfer processes, namely hZ, Zγ, WW and WWγ production from pp collisions. We derive upper limits on the gauge-invariant interactions of ALPs with the electroweak bosons and/or Higgs boson that contribute to these processes, from the re-interpretation of the latest Run 2 available LHC data. The constraints we obtain are strong for ALP masses below 100 GeV. These allowed effective interactions in the ALP parameter space yield better significance at HL-LHC and thus, offer promising avenues for subsequent studies. Furthermore, we augment our cut-based analysis with gradient-boosted decision trees, which improve the statistical significance distinctly across these interaction channels. We briefly compare the results with the complementary probe of these couplings via direct production of ALPs in association with the Higgs boson or a vector boson.
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Acknowledgments
The author would like to thank the organisers of 2023 “ICTP Summer School on Particle Physics” where this work was initiated and acknowledges the helpful lectures on the relevant topics. TB is thankful to Prof. Anindya Datta for the useful discussions. The author also acknowledges helpful exchanges with Ilaria Brivio during the course of the work and is thankful to Prof. Sabyasachi Chakraborty and Prof. Nirmal Raj for insightful comments on the manuscript. The work of TB is funded by the Council of Scientific and Industrial Research, Government of India through Senior Research Fellowship [File No. 09/028(1107)/2019-EMR-I].
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Biswas, T. Probing the interactions of axion-like particles with electroweak bosons and the Higgs boson in the high energy regime at LHC. J. High Energ. Phys. 2024, 81 (2024). https://doi.org/10.1007/JHEP05(2024)081
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DOI: https://doi.org/10.1007/JHEP05(2024)081