2024/10/23 by Subhadip Bisal, Arindam Chatterjee, Bisal, Subhadip +5 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · pdf · doi:10.48550/arxiv.2410.18205
openalex publication_date 2024/10/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The lightest neutralino (χ10) is a promising dark matter (DM) candidate in the R-parity conserving minimal supersymmetric standard model (MSSM). In this work, we focus on dominantly Higgsino-like and Wino-like χ10 DM, with small admixtures of gauginos and Higgsinos, respectively. In particular, we explore large one-loop corrections to the χ10 χ10Z vertex, which can significantly affect the estimation of the spin-dependent χ10-nucleon scattering cross-section in the regions where such DM candidates are viable. We have used the on-shell renormalization scheme to estimate the relevant counterterm contributions. In the parameter region where χ10 is dominantly Higgsino-like, the radiative corrections (including the contributions from the respective counterterms) are substantial and can enhance the χ10χ10Z vertex by up to ∼ 120% for the benchmark scenarios we have considered. Further, for an almost pure Wino-like χ10, the increment in the χ10χ10Z vertex is up to 15%. The corresponding cross-sections with the proton and the neutron can be changed by up to about 50%. In addition, including the electroweak box diagrams, the cross-sections can be significantly enhanced, in particular, for the Wino-like χ10.