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Chinese Physics C> 2017, Vol. 41> Issue(2) : 023003 DOI: 10.1088/1674-1137/41/2/023003

Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

  • 1.

     State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

  • 2.

     Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 3.

      Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 4.

      State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

  • The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab-1 over ten years of operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson fusion processes. This sample allows a percent or even sub-percent level determination of the Higgs boson couplings. With GEANT4-based full simulation and a dedicated fast simulation tool, we have evaluated the statistical precisions of the Higgstrahlung cross section σZH and the Higgs mass mH measurement at the CEPC in the Z→μ+μ- channel. The statistical precision of σZH (mH) measurement could reach 0.97% (6.9 MeV) in the model-independent analysis which uses only the information from Z boson decays. For the standard model Higgs boson, the mH precision could be improved to 5.4 MeV by including the information from Higgs decays. The impact of the TPC size on these measurements is investigated. In addition, we studied the prospect of measuring the Higgs boson decaying into invisible final states at the CEPC. With the Standard Model ZH production rate, the upper limit of ß(H→inv.) could reach 1.2% at 95% confidence level.

  • References

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    [2] S. Chatrchyan et al (The CMS Collaboration), Phys. Lett. B, 716:30(2012)
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    [13] B.L. Ioffe and V.A. Khoze, Sov. J. Part. Nucl., 9:50(1978)
    [14] B.W. Lee, C. Quigg and H.B. Thacker, Phys. Rev. D, 16:1519(1977)
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    [17] P.M. Zerwas, The Physics Potential, in the Workshop on e+e- Collisions at 500 GeV
    [18] C. Durig, K. Fujii, Jenny List et al, arXiv:1403.7734
    [19] Shouhua Zhu, Chin. Phys. Lett., 24:381(2007)
    [20] G. Belanger, F. Boudjema, A. Cottrant et al, Phys. Lett. B, 519:93(2001)
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    [22] M. Battaglia, D. Dominici, J.F. Gunion et al, arXiv:hepph/0402062
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    [24] G. Aad et al (The ATLAS Collaboration), Phys. Rev. Lett., 112:201802(2014)
    [25] J. Yan, S. Watanuki, K. Fujii et al, arXiv:1604.07524
    [26] Q. Xiu, H. Zhu and X. Lou, arXiv:1505.01270
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    [28] T. Behnke, J. Brau, P. Burrows et al, arXiv:1306.6329
    [29] W. Kilian, T. Ohl and J. Reuter, Eur. Phys. J. C, 71:1742(2011)
    [30] M. Moretti, T. Ohl and J. Reuter, arXiv:hepph/0102195
    [31] C. F. von Weizscker, Z. Phys., 88:612(1934)
    [32] E. J. Williams, Phys. Rev., 45:729(1934)
    [33] V. M. Budnev, I. F. Ginzburg, G. V. Meledin and V. G. Serbo, Phys. Rept. 15:181(1974)
    [34] Xin Mo, Gang Li, Manqi Ruan et al, Chin. Phys. C, 40:033001(2016)
    [35] P. Mora de Freitas and H. Videau, Detector simulation with Mokka/Geant4:present and future, in the International Workshop on Linear Colliders (LCWS 2002)
    [36] Manqi Ruan, arXiv:1403.4784
    [37] K.A. Olive et al., Chin. Phys. C, 38:090001(2014)
    [38] P. Speckmayer, A. Hocker, J. Stelzer et al, J. Phys. Conf. Ser., 219:032057(2010)
    [39] G. Cowan, K. Cranmer, E. Gross et al, Eur. Phys. J. C, 71:1554(2011)

  • References

    [1] G. Aad et al (The ATLAS Collaboration), Phys. Lett. B, 716:1(2012)
    [2] S. Chatrchyan et al (The CMS Collaboration), Phys. Lett. B, 716:30(2012)
    [3] S. Chatrchyan et al (The CMS Collaboration), JHEP, 06:081(2013)
    [4] G. Aad et al (The ATLAS Collaboration), Phys. Lett. B, 726:88(2013)
    [5] G. Aad et al (The ATLAS Collaboration), Phys. Lett. B, 726:120(2013)
    [6] V. Khachatryan et al (The CMS Collaboration), Eur. Phys. J. C, 75:212(2015)
    [7] V. Khachatryan et al (The CMS Collaboration), Phys. Rev. D, 92:012004(2015)
    [8] G. Aad et al (The ATLAS Collaboration and CMS Collaboration), Phys. Rev. Lett., 114:191803(2015)
    [9] S. Dawson, A. Gritsan, H. Logan et al, arXiv:1310.8361
    [10] H. Baer, T. Barklow, K. Fujii et al, arXiv:1306.6352
    [11] K. Eujii et al (LCC Physics Working Group), arXiv:1506.05992
    [12] J. Ellis, M.K. Gaillard, and D.V. Nanopoulos, Nucl. Phys. B, 106:292(1976)
    [13] B.L. Ioffe and V.A. Khoze, Sov. J. Part. Nucl., 9:50(1978)
    [14] B.W. Lee, C. Quigg and H.B. Thacker, Phys. Rev. D, 16:1519(1977)
    [15] J.D. Bjorken, Weak-interaction Theory and Neutral Currents, in proceedings of the 1976 SLAC Summer Institute on Particle Physics
    [16] M. Carena, P. Zerwas, E. Accomando et al, arXiv:hep-ph/9602250
    [17] P.M. Zerwas, The Physics Potential, in the Workshop on e+e- Collisions at 500 GeV
    [18] C. Durig, K. Fujii, Jenny List et al, arXiv:1403.7734
    [19] Shouhua Zhu, Chin. Phys. Lett., 24:381(2007)
    [20] G. Belanger, F. Boudjema, A. Cottrant et al, Phys. Lett. B, 519:93(2001)
    [21] G.F. Giudice, R. Rattazzi, J.D. Wells, Nucl. Phys. B, 595:250(2001)
    [22] M. Battaglia, D. Dominici, J.F. Gunion et al, arXiv:hepph/0402062
    [23] S. Chatrchyan et al (The CMS Collaboration), Eur. Phys. J. C, 74:2980(2014)
    [24] G. Aad et al (The ATLAS Collaboration), Phys. Rev. Lett., 112:201802(2014)
    [25] J. Yan, S. Watanuki, K. Fujii et al, arXiv:1604.07524
    [26] Q. Xiu, H. Zhu and X. Lou, arXiv:1505.01270
    [27] The ILD concept group, arXiv:1006.3396
    [28] T. Behnke, J. Brau, P. Burrows et al, arXiv:1306.6329
    [29] W. Kilian, T. Ohl and J. Reuter, Eur. Phys. J. C, 71:1742(2011)
    [30] M. Moretti, T. Ohl and J. Reuter, arXiv:hepph/0102195
    [31] C. F. von Weizscker, Z. Phys., 88:612(1934)
    [32] E. J. Williams, Phys. Rev., 45:729(1934)
    [33] V. M. Budnev, I. F. Ginzburg, G. V. Meledin and V. G. Serbo, Phys. Rept. 15:181(1974)
    [34] Xin Mo, Gang Li, Manqi Ruan et al, Chin. Phys. C, 40:033001(2016)
    [35] P. Mora de Freitas and H. Videau, Detector simulation with Mokka/Geant4:present and future, in the International Workshop on Linear Colliders (LCWS 2002)
    [36] Manqi Ruan, arXiv:1403.4784
    [37] K.A. Olive et al., Chin. Phys. C, 38:090001(2014)
    [38] P. Speckmayer, A. Hocker, J. Stelzer et al, J. Phys. Conf. Ser., 219:032057(2010)
    [39] G. Cowan, K. Cranmer, E. Gross et al, Eur. Phys. J. C, 71:1554(2011)

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Get Citation
Zhen-Xing Chen, Ying Yang, Man-Qi Ruan, Da-Yong Wang, Gang Li, Shan Jin and Yong Ban. Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC[J]. Chinese Physics C, 2017, 41(2): 023003. doi: 10.1088/1674-1137/41/2/023003
Zhen-Xing Chen, Ying Yang, Man-Qi Ruan, Da-Yong Wang, Gang Li, Shan Jin and Yong Ban. Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC[J]. Chinese Physics C, 2017, 41(2): 023003.  doi: 10.1088/1674-1137/41/2/023003 shu
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Received: 2016-01-21
Revised: 2016-10-25
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    Supported by the Joint Funds of the NSFC (U1232105) and CAS Hundred Talent Program (Y3515540U1)

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Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

    Corresponding author: Zhen-Xing Chen,
    Corresponding author: Man-Qi Ruan,
    Corresponding author: Da-Yong Wang,
  • 1. State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 3.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4.  State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • Received Date: 2016-01-21
  • Accepted Date: 2016-10-25
  • Available Online: 2017-02-05
Fund Project:  Supported by the Joint Funds of the NSFC (U1232105) and CAS Hundred Talent Program (Y3515540U1)

Abstract: The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab-1 over ten years of operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson fusion processes. This sample allows a percent or even sub-percent level determination of the Higgs boson couplings. With GEANT4-based full simulation and a dedicated fast simulation tool, we have evaluated the statistical precisions of the Higgstrahlung cross section σZH and the Higgs mass mH measurement at the CEPC in the Z→μ+μ- channel. The statistical precision of σZH (mH) measurement could reach 0.97% (6.9 MeV) in the model-independent analysis which uses only the information from Z boson decays. For the standard model Higgs boson, the mH precision could be improved to 5.4 MeV by including the information from Higgs decays. The impact of the TPC size on these measurements is investigated. In addition, we studied the prospect of measuring the Higgs boson decaying into invisible final states at the CEPC. With the Standard Model ZH production rate, the upper limit of ß(H→inv.) could reach 1.2% at 95% confidence level.

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