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Seesaw type I and III at the LHeC

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Abstract

We study the potential of testing the seesaw type-I and III models at the Large Hadron-electron Collider (LHeC), an e-p collision mode at the CERN collider. The e-p collision mode provides an excellent place to study lepton number violating processes e − p → N i j + X → e + W − j + X, e − p → N i j + X → τ ± W ∓ j + X and e − p → E i j + X → τ − Zj + X with W and Z into hadron jets. Here N 1,2,3 and E 1,2,3 are heavy Majorana neutrinos and heavy charged leptons, and j is a hard hadron jet. Although the process e − p → N i j + X → e + W − j + X is stringently constrained from neutrinoless double-beta decay, there are solutions where this constraint can be satisfied with sizeable production cross section. With the electron energy E e = 140 GeV and proton energy E p = 7 TeV, we find that the cross section for the heavy charged lepton E production can reach a few fb when the heavy charged lepton mass m E < 600 GeV. For the heavy neutrino N production, the cross section can be as large as a few fb for the mass scale as high as 1 TeV, higher than what can be achieved by the p-p collision mode of LHC with the same related heavy neutrino couplings.

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Authors and Affiliations

  1. Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China

    Liang Han, Ma Wen-Gan, Wang Shao-Ming & Zhang Ren-You

  2. INPAC and Department of Physics, Shanghai Jiao Tong University, 200240, Shanghai, China

    Xiao-Gang He

  3. Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan

    Xiao-Gang He

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  1. Liang Han
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Correspondence to Wang Shao-Ming.

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ArXiv ePrint: 1006.5534v3

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Han, L., He, XG., Wen-Gan, M. et al. Seesaw type I and III at the LHeC. J. High Energ. Phys. 2010, 23 (2010). https://doi.org/10.1007/JHEP09(2010)023

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