Dark Matter Interactions with Nuclei Michael Wagman P.I. Phiala - PowerPoint PPT Presentation

Dark Matter Interactions with Nuclei Michael Wagman P.I. Phiala Shanahan Blue Waters Symposium 2019

What we know e − e − e − Gravity Electromagnetism e − Weak Force Strong Force ν e � 2

What we know � 3

<latexit sha1_base64="swmNRK2o8K1Hz6meupivKrMWKyI=">A B7nicbVBNS8NAFHypX7V+VT16WSyCp5Ko AcPBS8ePFSwt CGstls2qWbTdh9EUroj/DiQRGv/h5v/hu3bQ7aOrAwzMxj35sglcKg6347pZXVtfWN8mZla3tnd6+6f/Bok wz3mKJTHQnoIZLoXgLBUreSTWncSB5OxjdTP32E9dGJOoBxyn3YzpQIhKMopXavTsbDWm/WnPr7gxkmXgFqUGBZr/61QsTlsVcIZPUmK7npujnVKNgk 8qvczwlLIRHfCupYrG3Pj5bN0JObFKSKJE26eQzNTfEzmNjRnHgU3GFIdm0ZuK/3ndDKMrPxcqzZArNv8oyiTBhExvJ6HQnKEcW0KZFnZXwoZU 4a2oYotwVs8eZk8ntW987p7f1FrXBd1lOEIjuEUPLiEBtxCE1rAYATP8ApvTuq8O /OxzxacoqZQ/gD5/MHCoGPWQ= </latexit> What we don’t know Astrophysical and cosmological observations show that most of the universe is not ordinary Standard Model matter Best-fit CDM Λ Ordinary matter only CMB power spectrum Black Points - WMAP data https://lambda.gsfc.nasa.gov/education/cmb_plotter/ � 4

What we don’t know � 5

Dark matter direct detection Experiments look for nuclei recoiling from scattering with something invisible Heavy nuclei are often used to maximize sensitivity Standard Model theory needed to relate nucleus - dark matter interactions with proton (or quark) - dark matter interactions Theory assumptions LUX � 6 � 6 Akerib et al (LUX), PRL 118 (2017)

Naive nuclei Nuclei = naive shell model + QCD effects Axial / tensor currents couple to nuclear spin ( ( spin spin spin spin = = Naive shell model spin Scalar currents couple to total quark number of nucleus, — Dominate spin-independent dark matter scattering = + + Naive shell � 7 model

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From quarks to nuclei Nuclei can be constructed from lattice QCD path integrals by contracting quark propagators with appropriately symmetrized nuclear wavefunctions NPLQCD, Yamazaki et al, Detmold and Orginos, Doi and Endres, Comput. Phys. PRL 87 (2013) PRD 86 (2012) PRD 87 (2013) Commun. 184 (2013) … Calculations performed at unphysically heavy quark masses so far Naive shell model describes the magnetic moments of light nuclei in nature and at heavier quark masses with surprisingly good accuracy W. Detmold � 10