Searching for flavored gauge bosons

Journal of High Energy Physics, Feb 2019

Abstract Standard Model may allow an extended gauge sector with anomaly-free flavored gauge symmetries, such as Li −Lj , Bi −Lj , and B −3Li, where i, j = 1, 2, 3 are flavor indices. We investigate phenomenological implications of the new flavored gauge boson Z′ in the above three classes of gauge symmetries. Focusing on the gauge boson mass above 5 GeV, we use the lepton universality test in the Z and τ /μ decays, LEP searches, LHC searches, neutrino trident production bound, and LHC Z → 4μ searches to put constraints on the g′ −MZ′ plane. When L1 is involved, the LEP bounds on the e−e+ → ℓ−ℓ+ processes give the most stringent bounds, while the LHC bound becomes the strongest constraints in the large \( {M}_{Z^{\prime }} \) region when Bi is involved. The bound from Z → 4μ productions, which is applicable for L2-involved scenarios, provides stringent bounds in the small \( {M}_{Z^{\prime }} \) region. One exception is the B − 3L2 scenario, in which case only a small region is favored due to the lepton universality.

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Searching for flavored gauge bosons

Journal of High Energy Physics February 2019, 2019:93 | Cite as Searching for flavored gauge bosons AuthorsAuthors and affiliations Eung Jin ChunArindam DasJinsu KimJongkuk Kim Open Access Regular Article - Theoretical Physics First Online: 14 February 2019 Abstract Standard Model may allow an extended gauge sector with anomaly-free flavored gauge symmetries, such as Li −Lj , Bi −Lj , and B −3Li, where i, j = 1, 2, 3 are flavor indices. We investigate phenomenological implications of the new flavored gauge boson Z′ in the above three classes of gauge symmetries. Focusing on the gauge boson mass above 5 GeV, we use the lepton universality test in the Z and τ /μ decays, LEP searches, LHC searches, neutrino trident production bound, and LHC Z → 4μ searches to put constraints on the g′ −MZ′ plane. When L1 is involved, the LEP bounds on the e−e+ → ℓ−ℓ+ processes give the most stringent bounds, while the LHC bound becomes the strongest constraints in the large \( {M}_{Z^{\prime }} \) region when Bi is involved. The bound from Z → 4μ productions, which is applicable for L2-involved scenarios, provides stringent bounds in the small \( {M}_{Z^{\prime }} \) region. One exception is the B − 3L2 scenario, in which case only a small region is favored due to the lepton universality. Keywords Beyond Standard Model Gauge Symmetry  ArXiv ePrint: 1811.04320 Download to read the full article text Notes Open Access This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. References [1] J. Alexander et al., Dark Sectors 2016 Workshop: Community Report, arXiv:1608.08632 [INSPIRE]. [2] P. Ilten, Y. Soreq, M. Williams and W. 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Eung Jin Chun, Arindam Das, Jinsu Kim, Jongkuk Kim. Searching for flavored gauge bosons, Journal of High Energy Physics, 2019, 93, DOI: 10.1007/JHEP02(2019)093