Power corrections to the universal heavy WIMP-nucleon cross section
Autor: | Alexander M. Wijangco, Richard Hill, Mikhail P. Solon, Chien-Yi Chen |
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Rok vydání: | 2018 |
Předmět: |
Physics
Nuclear and High Energy Physics Particle physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Electroweak interaction FOS: Physical sciences Fermion Computer Science::Digital Libraries 01 natural sciences lcsh:QC1-999 Gluon Standard Model High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) WIMP 0103 physical sciences Effective field theory High Energy Physics::Experiment Neutrino 010306 general physics Nucleon lcsh:Physics Astrophysics - Cosmology and Nongalactic Astrophysics |
Zdroj: | Physics Letters Physics Letters B, Vol 781, Iss, Pp 473-479 (2018) |
ISSN: | 0370-2693 |
Popis: | WIMP-nucleon scattering is analyzed at order $1/M$ in Heavy WIMP Effective Theory. The $1/M$ power corrections, where $M\gg m_W$ is the WIMP mass, distinguish between different underlying UV models with the same universal limit and their impact on direct detection rates can be enhanced relative to naive expectations due to generic amplitude-level cancellations at leading order. The necessary one- and two-loop matching calculations onto the low-energy effective theory for WIMP interactions with Standard Model quarks and gluons are performed for the case of an electroweak SU(2) triplet WIMP, considering both the cases of elementary fermions and composite scalars. The low-velocity WIMP-nucleon scattering cross section is evaluated and compared with current experimental limits and projected future sensitivities. Our results provide the most robust prediction for electroweak triplet Majorana fermion dark matter direct detection rates; for this case, a cancellation between two sources of power corrections yields a small total $1/M$ correction, and a total cross section close to the universal limit for $M \gtrsim {\rm few} \times 100\,{\rm GeV}$. For the SU(2) composite scalar, the $1/M$ corrections introduce dependence on underlying strong dynamics. Using a leading chiral logarithm evaluation, the total $1/M$ correction has a larger magnitude and uncertainty than in the fermionic case, with a sign that further suppresses the total cross section. These examples provide definite targets for future direct detection experiments and motivate large scale detectors capable of probing to the neutrino floor in the TeV mass regime. 12 pages, 4 figures; references added, XENONnT projection included, version to appear in Physics Letters B |
Databáze: | OpenAIRE |
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