Abstract
The axion-like particle (ALP) may induce flavor-changing neutral currents (FCNCs) when the fermions’ Peccei-Quinn charges are not generation universal. The search for flavor-violating ALP couplings with a bottom quark so far focused on FCNC processes of B mesons at low energies. The recent measurements of B → K + X rare decays place stringent bounds on the quark flavor violations of a light ALP in different decay modes. In this work we propose a novel direct search for bottom flavor-violating interaction of a heavy ALP at the LHC and its upgrades, namely QCD production of an ALP associated with one b jet and one light jet p p → b j a. We consider the decay of the ALP to photons, muons and invisible ALP decays. The Boosted Decision Tree (BDT) algorithm is used to analyze the events and we train the BDT classifier by feeding in the kinematic observables of signal and backgrounds. Finally, we show the complementarity between the search prospects of hadron colliders and the low-energy B meson constraints from B meson mixing and B meson decays to a light ALP.
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Acknowledgments
T. L. is supported by the National Natural Science Foundation of China (Grant No. 12375096, 12035008, 11975129) and “the Fundamental Research Funds for the Central Universities”, Nankai University (Grant No. 63196013). M. S. acknowledges support by the Australian Research Council Discovery Project DP200101470.
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Li, T., Qian, Z., Schmidt, M.A. et al. The quark flavor-violating ALPs in light of B mesons and hadron colliders. J. High Energ. Phys. 2024, 232 (2024). https://doi.org/10.1007/JHEP05(2024)232
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DOI: https://doi.org/10.1007/JHEP05(2024)232