# Search for invisible decays of the Higgs boson produced at the CEPC

• The Circular Electron Positron Collider (CEPC) proposed as a future Higgs boson factory will operate at a center-of-mass energy of 240 GeV and accumulate 5.6 ab-1 of integrated luminosity in 7 years. In this paper, we estimate the upper limit of BR($H \rightarrow$ inv) for three independent channels including two leptonic channels and one hadronic channel at the CEPC. Based on the full simulation analysis, the upper limit of BR($H \rightarrow$ inv) could reach 0.26% at the 95% confidence level. In the Stand Model (SM), the Higgs boson can only decay invisibly via $H\rightarrow ZZ^\ast\rightarrow\nu\overline{\nu}\nu\overline{\nu}$, so any evidence of invisible Higgs decays that exceeds BR($H \rightarrow$ inv) of SM will indicate a phenomenon that is beyond the SM (BSM). The invariant mass resolution of visible hadronic decay system $ZH(Z \rightarrow qq$, $H \rightarrow$ inv) is simulated and the physics requirement at the CEPC detector to reach this is given.
•  [1] G. Bertone et al., Rev. Mod. Phys, 90(4): 045002 (2018) doi: 10.1103/RevModPhys.90.045002 [2] D. Clowe et al., Astrophys. J. Lett, 648: L109-L113 (2006) doi: 10.1086/508162 [3] A. Djouadi et al., Phys. Lett. B, 709: 65-69 (2012) doi: 10.1016/j.physletb.2012.01.062 [4] R. E. Shrock et al., Phys. Lett. B, 110: 250 (1982) doi: 10.1016/0370-2693(82)91247-3 [5] K. Belotsky et al., Phys. Rev. D, 68: 054027 (2003) doi: 10.1103/PhysRevD.68.054027 [6] F. An et al., Chin. Phys. C, 43(4): 043002 (2019) doi: 10.1088/1674-1137/43/4/043002 [7] M. Aaboud et al., Phys. Rev. Lett, 122(23): 231801 (2019) doi: 10.1103/PhysRevLett.122.231801 [8] A. M Sirunyan et al., Phys. Lett. B, 793: 520-551 (2019) doi: 10.1016/j.physletb.2019.04.025 [9] Z. Chen et al., Chin. Phys. C, 41(2): 023003 (2017) doi: 10.1088/1674-1137/41/2/023003 [10] M. Ruan et al. Arbor, a new approach of the Particle Flow Algorithm. In International Conference on Calorimetry for the High Energy Frontier, pages 316-324, 2013 [11] T. Abe et al. The International Large Detector: Letter of Intent. 2010 [12] H. Abramowicz et al. The International Linear Collider Technical Design Report - Volume 4: Detectors. Technical report, 2013. [13] C. Fu. Full simulation software at CEPC. http://cepcdoc.ihep.ac.cn/DocDB/0001/000167/002/CEPCNoteCover.pdf, 2019. [14] L. Sartini et al., Nucl. Instrum. Meth. A, (2010) [15] W. Kilian et al., Eur. Phys. J. C, 71: 1742 (2011) doi: 10.1140/epjc/s10052-011-1742-y [16] D. Yu et al., Eur. Phys. J. C, 80(1): 7 (2020) doi: 10.1140/epjc/s10052-019-7557-y [17] G. Cowan. Discovery sensitivity for a counting experiment with background uncertainty. 2020 [18] G. Cowan et al. Asymptotic formulae for likelihood-based tests of new physics, Eur. Phys. J. C, 71: 1554, 2011, [Erratum: Eur. Phys. J. C, 73: 2501 (2013)] [19] The ATLAS, CMS Collaborations, and the LHC Higgs Combination Group. Procedure for the LHC Higgs boson search combination in Summer 2011. Technical Report CMS-NOTE- 2011-005. ATL-PHYS-PUB-2011-11, CERN, Geneva, 2011 [20] CEPC Study Group. CEPC Conceptual Design Report: Volume 2 - Physics & Detector. 2018 [21] H. Zhao et al., Chin. Phys. C, 43(2): 023001 (2019) doi: 10.1088/1674-1137/43/2/023001 [22] M. Cepeda et al., CERN Yellow Rep. Monogr, 7: 221-584 (2019) [23] A. Ishikawa. Search for invisible decays of the Higgs boson at the ILC. PoS, LeptonPhoton2019: 147, 2019. [24] J. de Blas et al., JHEP, 01: 139 (2020)

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Yuhang Tan, Xin Shi, Ryuta Kiuchi, Manqi Ruan, Maoqiang Jing, Dan Yu, Kaili Zhang, Xinchou Lou, Xin Mo, Gang Li and Susmita Jyotishmati. Search for invisible decays of the Higgs boson produced at the CEPC[J]. Chinese Physics C.
Yuhang Tan, Xin Shi, Ryuta Kiuchi, Manqi Ruan, Maoqiang Jing, Dan Yu, Kaili Zhang, Xinchou Lou, Xin Mo, Gang Li and Susmita Jyotishmati. Search for invisible decays of the Higgs boson produced at the CEPC[J]. Chinese Physics C.
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###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

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## Search for invisible decays of the Higgs boson produced at the CEPC

• 1. Institute of High Energy Physics, Beijing 100049, China
• 2. School of Physical Sciences, University of Chinese Academy of Science (UCAS), Beijing 100049, China
• 3. State Key Laboratory of Particle Detection and Electronics, 19B Yuquan Road, Shijingshan District, Beijing 100049, China
• 4. Department of Physics, University of Texas at Dallas, Texas 75080-3021, USA

Abstract: The Circular Electron Positron Collider (CEPC) proposed as a future Higgs boson factory will operate at a center-of-mass energy of 240 GeV and accumulate 5.6 ab-1 of integrated luminosity in 7 years. In this paper, we estimate the upper limit of BR($H \rightarrow$ inv) for three independent channels including two leptonic channels and one hadronic channel at the CEPC. Based on the full simulation analysis, the upper limit of BR($H \rightarrow$ inv) could reach 0.26% at the 95% confidence level. In the Stand Model (SM), the Higgs boson can only decay invisibly via $H\rightarrow ZZ^\ast\rightarrow\nu\overline{\nu}\nu\overline{\nu}$, so any evidence of invisible Higgs decays that exceeds BR($H \rightarrow$ inv) of SM will indicate a phenomenon that is beyond the SM (BSM). The invariant mass resolution of visible hadronic decay system $ZH(Z \rightarrow qq$, $H \rightarrow$ inv) is simulated and the physics requirement at the CEPC detector to reach this is given.

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