Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP09(2023)168
Keywords
New Gauge Interactions; New Light Particles; Specific BSM Phenomenology
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This study explores the sensitivities of precision experiments to the U(1) models with non-universal lepton charges, and proposes detection methods for the new gauge boson Z' and the new CP-even scalar phi with FASER/FASER2, COHERENT, and DUNE/T2HK experiments.
The general anomaly-free U(1)' models allow non-universal lepton charges. We explore the sensitivities of FASER/FASER2, COHERENT and DUNE/T2HK precision experiments to the new gauge boson Z' and the new CP-even scalar phi. With non-universal lepton charges, distinctive reaches at FASER/FASER2 emerge in the regime of low mZ' and small gauge coupling gBL for different U(1)' charge setups. The COHERENT experiment and the future long-baseline experiments DUNE/T2HK also provide complementary probes to the available parameter space. For m(phi) < 2m(Z'), the search for the scalar phi at FASER/FASER2 is sensitive to the mixing angle between the scalar singlet and the SM Higgs. In the case of m(phi) > 2m(Z)', the kinematically allowed decay phi -> Z'Z' changes the lifetime and decay rates of the scalar.. The sensitivity reach highly depends on the Z' mass and the gauge coupling g(BL)
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