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Revisiting scalar and pseudoscalar couplings with nucleons

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Abstract

Certain dark matter interactions with nuclei are mediated possibly by a scalar or pseudoscalar Higgs boson. The estimation of the corresponding cross sections requires a correct evaluation of the couplings between the scalar or pseudoscalar Higgs boson and the nucleons. Progress has been made in two aspects relevant to this study in the past few years. First, recent lattice calculations show that the strange-quark sigma term σs and the strange-quark content in the nucleon are much smaller than what are expected previously. Second, lattice and model analyses imply sizable SU(3) breaking effects in the determination on the axial-vector coupling constant \( g_A^8 \) that in turn affect the extraction of the isosinglet coupling \( g_A^0 \) and the strange quark spin component Δs from polarized deep inelastic scattering experiments. Based on these new developments, we re-evaluate the relevant nucleon matrix elements and compute the scalar and pseudoscalar couplings of the proton and neutron. We also find that the strange quark contribution in both types of couplings is smaller than previously thought.

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Authors and Affiliations

  1. Institute of Physics, Academia Sinica, Taipei, Taiwan, 11529, R.O.C

    Hai-Yang Cheng & Cheng-Wei Chiang

  2. Department of Physics and Center for Mathematics and Theoretical Physics, National Central University, Chungli, Taiwan, 32001, R.O.C

    Cheng-Wei Chiang

  3. Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan, 30013, R.O.C

    Cheng-Wei Chiang

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  1. Hai-Yang Cheng
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Cheng, HY., Chiang, CW. Revisiting scalar and pseudoscalar couplings with nucleons. J. High Energ. Phys. 2012, 9 (2012). https://doi.org/10.1007/JHEP07(2012)009

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