\begin{document}$ h\to Z\gamma $\end{document} and \begin{document}$ h\to\gamma\gamma $\end{document} decays in the flavor-gauged two Higgs doublet model (FG2HDM), which augments the Standard Model (SM) with an additional scalar doublet, a singlet, and a \begin{document}$ U(1)' $\end{document} flavor gauge symmetry. Beyond the SM spectrum, FG2HDM predicts five additional physical scalars and a new neutral gauge boson, \begin{document}$ Z' $\end{document}. We demonstrate that while both decay channels are sensitive to charged Higgs loops, \begin{document}$ h \to Z\gamma $\end{document} is uniquely modified by fermion-antifermion-Z (\begin{document}$ f\bar{f}Z $\end{document}) vertex corrections. These vertex corrections further impact top-quark observables and the flavor-changing neutral current (FCNC) process \begin{document}$ b\to s\ell^+\ell^- $\end{document}. Our analysis identifies a viable parameter space (\begin{document}$ m_{H^\pm}>200 $\end{document} GeV and \begin{document}$ \lambda_{hH^+H^-}<0 $\end{document}) consistent with current \begin{document}$ 1\sigma $\end{document} experimental limits, where the signal strength \begin{document}$ \mu_{\gamma\gamma} $\end{document} remains the primary constraint on scalar sector parameters. Regarding the \begin{document}$ f\bar{f}Z $\end{document} couplings, we delineate the allowed regions in the \begin{document}$ \mathcal{Q}_{tL} $\end{document}-\begin{document}$ \mathcal{Q}_{tR} $\end{document} plane by evaluating the leading top-quark contributions, revealing that \begin{document}$ b\to s\ell^+\ell^- $\end{document} imposes the most stringent bounds. Finally, we highlight that the \begin{document}$ 14\% $\end{document} projected precision for \begin{document}$ \mu_{Z\gamma} $\end{document} at the High-Luminosity LHC (HL-LHC) will significantly enhance sensitivity to the FG2HDM."> Higgs decays to <i>Z</i><i>γ</i> and <i>γ</i><i>γ</i> in the flavor-gauged two Higgs doublet model -
  • [1]

    G. Aadet al. (ATLAS Collaboration), Phys. Lett. B716, 1 (2012), arXiv: 1207.7214[hep-ex]

  • [2]

    S. Chatrchyanet al. (CMS Collaboration), Phys. Lett. B716, 30 (2012), arXiv: 1207.7235[hep-ex]

  • [3]

    S. Chatrchyanet al. (CMS Collaboration), JHEP06, 081 (2013), arXiv: 1303.4571[hep-ex]

  • [4]

    T. D. Lee, Phys. Rev. D8, 1226 (1973)

  • [5]

    S. L. Glashow and S. Weinberg, Phys. Rev. D15, 1958 (1977)

  • [6]

    E. A. Paschos, Phys. Rev. D15, 1966 (1977)

  • [7]

    A. Pich and P. Tuzon, Phys. Rev. D80, 091702 (2009), arXiv: 0908.1554[hep-ph]

  • [8]

    M. Jung, A. Pich, and P. Tuzon, JHEP11, 003 (2010), arXiv: 1006.0470[hep-ph]

  • [9]

    P. M. Ferreira, L. Lavoura, and J. P. Silva, Phys. Lett. B688, 341 (2010), arXiv: 1001.2561[hep-ph]

  • [10]

    N. Cabibbo, Phys. Rev. Lett.10, 531 (1963)

  • [11]

    M. Kobayashi and T. Maskawa, Prog. Theor. Phys.49, 652 (1973)

  • [12]

    G. C. Branco, W. Grimus, and L. Lavoura, Phys. Lett. B380, 119 (1996), arXiv: hep-ph/9601383

  • [13]

    A. Celis, J. Fuentes-Martin, M. Junget al., Phys. Rev. D92, 015007 (2015), arXiv: 1505.03079[hep-ph]

  • [14]

    A. Ordell, R. Pasechnik, H. Serôdioet al., Phys. Rev. D100, 115038 (2019), arXiv: 1909.05548[hep-ph]

  • [15]

    A. Ordell, R. Pasechnik, and H. Serôdio, Phys. Rev. D102, 035016 (2020), arXiv: 2006.08676[hep-ph]

  • [16]

    P. M. Ferreira, F. F. Freitas, J. a. Gonçalveset al., Phys. Rev. D106, 075017 (2022), arXiv: 2202.13153[hep-ph]

  • [17]

    G. Aadet al. (ATLAS Collaboration), Phys. Lett. B809, 135754 (2020), arXiv: 2005.05382[hep-ex]

  • [18]

    A. Tumasyanet al. (CMS Collaboration), JHEP05, 233 (2023), arXiv: 2204.12945[hep-ex]

  • [19]

    G. Aadet al. (ATLAS and CMS Collaborations), Phys. Rev. Lett.132, 021803 (2024a), arXiv: 2309.03501[hep-ex]

  • [20]

    A. Khodjamirian, K. Melnikov, and A. Vainshtein, (2025), arXiv: 2512.02165[hep-ph]

  • [21]

    M. Spira, A. Djouadi, and P. M. Zerwas, Phys. Lett. B276, 350 (1992)

  • [22]

    T. Gehrmann, S. Guns, and D. Kara, JHEP09, 038 (2015), arXiv: 1505.00561[hep-ph]

  • [23]

    R. Bonciani, V. Del Duca, H. Frellesviget al., JHEP08, 108 (2015), arXiv: 1505.00567[hep-ph]

  • [24]

    F. Buccioni, F. Devoto, A. Djouadiet al., Phys. Lett. B851, 138596 (2024), arXiv: 2312.12384[hep-ph]

  • [25]

    Z. Q. Chen, L. B. Chen, C. F. Qiaoet al., Phys. Rev. D110, L051301 (2024), arXiv: 2404.11441[hep-ph]

  • [26]

    W. L. Sang, F. Feng, and Y. Jia, Phys. Rev. D110, L051302 (2024), arXiv: 2405.03464[hep-ph]

  • [27]

    S. Panghal and B. Mukhopadhyaya, (2023), arXiv: 2310.04136[hep-ph]

  • [28]

    G. Lichtenstein, M. A. Schmidt, G. Valenciaet al., Nucl. Phys. B1013, 116850 (2025), arXiv: 2312.09409[hep-ph]

  • [29]

    T. T. Hong, V. K. Le, L. T. T. Phuonget al., PTEP2024, 033B04 (2024) [Erratum: PTEP2024, 059201 (2024)], arXiv: 2312.11045[hep-ph]

  • [30]

    R. Boto, D. Das, J. C. Romaoet al., Phys. Rev. D109, 095002 (2024a), arXiv: 2312.13050[hep-ph]

  • [31]

    N. Das, T. Jha, and D. Nanda, Phys. Rev. D109, 115020 (2024), arXiv: 2402.01317[hep-ph]

  • [32]

    K. Cheung and C. J. Ouseph, Phys. Rev. D110, 055016 (2024), arXiv: 2402.05678[hep-ph]

  • [33]

    X. G. He, Z. L. Huang, M. W. Liet al., JHEP10, 135 (2024), arXiv: 2402.08190[hep-ph]

  • [34]

    B. A. Ouazghour, M. Chabab, and K. Goure, Eur. Phys. J. C84, 879 (2024), arXiv: 2403.07722[hep-ph]

  • [35]

    A. Arhrib, K. H. Phan, V. Q. Tranet al., (2024), arXiv: 2405.03127[hep-ph]

  • [36]

    A. I. Hernández-Juárez, R. Gaitán, and R. Martinez, Phys. Rev. D111, 015001 (2025), arXiv: 2405.03094[hep-ph]

  • [37]

    C. Grojean, G. Guedes, J. Roosmale Nepveuet al., JHEP12, 065 (2024), arXiv: 2405.20371[hep-ph]

  • [38]

    H. c. Hu, Z. Y. Zhang, N. Y. Zhuet al., Chin. Phys. C48, 093101 (2024), arXiv: 2406.00946[hep-ph]

  • [39]

    A. Arhrib, R. Benbrik, L. Rahiliet al., Eur. Phys. J. C84, 799 (2024b), arXiv: 2406.13001[hep-ph]

  • [40]

    K. H. Phan, D. T. Tran, and T. H. Nguyen, PTEP2025, 023B05 (2025), arXiv: 2406.15749[hep-ph]

  • [41]

    S. Israr and M. Rehman, Eur. Phys. J. Plus140, 397 (2025), arXiv: 2407.01210[hep-ph]

  • [42]

    K. Mantzaropoulos, Phys. Rev. D110, 055041 (2024), arXiv: 2407.09145[hep-ph]

  • [43]

    R. Boto, P. N. Figueiredo, J. C. Romãoet al., JHEP11, 108 (2024), arXiv: 2407.15933[hep-ph]

  • [44]

    D. Barducci, L. Di Luzio, M. Nardecchiaet al., JHEP12, 154 (2023), arXiv: 2311.10130[hep-ph]

  • [45]

    ATLAS Collaboration (ATLAS Collaboration), ATLAS-CONF-2025-007 (2025)

  • [46]

    J. F. Gunion, H. E. Haber, G. L. Kaneet al.,The Higgs Hunter's Guide, Vol. 80 (2000)

  • [47]

    A. Djouadi, Phys. Rept.457, 1 (2008), arXiv: hep-ph/0503172

  • [48]

    S. Navaset al. (Particle Data Group), Phys. Rev. D110, 030001 (2024)

  • [49]

    Q. Wen and F. Xu, Phys. Rev. D111, 115024 (2025)

  • [50]

    D. Fontes, J. C. Romão, and J. a. P. Silva, JHEP12, 043 (2014), arXiv: 1408.2534[hep-ph]

  • [51]

    G. Aadet al. (ATLAS Collaboration), Phys. Lett. B732, 8 (2014), arXiv: 1402.3051[hep-ex]

  • [52]

    S. Chatrchyanet al. (CMS Collaboration), Phys. Lett. B726, 587 (2013b), arXiv: 1307.5515[hep-ex]

  • [53]

    L. Bergstrom and G. Hulth, Nucl. Phys. B259, 137 (1985) [Erratum: Nucl. Phys. B276, 744 (1986)]

  • [54]

    H. H. Patel, Comput. Phys. Commun.197, 276 (2015), arXiv: 1503.01469[hep-ph]

  • [55]

    D. de Florianet al.(LHC Higgs Cross Section Working Group),2/2017(2016), 10.23731/CYRM-2017-002, arXiv: 1610.07922[hep-ph]

  • [56]

    A. M. Sirunyanet al. (CMS Collaboration), JHEP03, 056 (2020), arXiv: 1907.11270[hep-ex]

  • [57]

    G. Aadet al. (ATLAS Collaboration), Eur. Phys. J. C81, 737 (2021), arXiv: 2103.12603[hep-ex]

  • [58]

    G. Aadet al. (ATLAS Collaboration), JHEP07, 163 (2024), arXiv: 2312.04450[hep-ex]

  • [59]

    G. Aadet al. (ATLAS Collaboration), JHEP05, 305 (2024), arXiv: 2403.02126[hep-ex]

  • [60]

    W. Buchmuller and D. Wyler, Nucl. Phys. B268, 621 (1986)

  • [61]

    B. Grzadkowski, M. Iskrzynski, M. Misiaket al., JHEP10, 085 (2010), arXiv: 1008.4884[hep-ph]

  • [62]

    I. Brivio and M. Trott, Phys. Rept.793, 1 (2019), arXiv: 1706.08945[hep-ph]

  • [63]

    J. A. Aguilar-Saavedra, Nucl. Phys. B812, 181 (2009), arXiv: 0811.3842[hep-ph]

  • [64]

    Q. Wen and F. Xu, Phys. Rev. D108, 095038 (2023), arXiv: 2305.19038[hep-ph]

  • [65]

    G. Aadet al.(ATLAS, CMS), (2025), arXiv: 2504.00672[hep-ex]

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