Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-02-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages
Scientific paper
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 $\sigma_s$ 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 $\Delta s$ 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.
Cheng Hai-Yang
Chiang Cheng-Wei
No associations
LandOfFree
Revisiting Scalar and Pseudoscalar Couplings with Nucleons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Revisiting Scalar and Pseudoscalar Couplings with Nucleons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revisiting Scalar and Pseudoscalar Couplings with Nucleons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-578417