Event Category: Particle Seminar

Particle Seminar:
Wednesdays 2:00pm at LBNL

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Abstract: The standard paradigm of collisionless cold dark matter is in tension with measurements on large scales. In particular, the best fit values of the Hubble rate H0 and the matter density perturbation sigma8 inferred from the cosmic microwave background seem inconsistent with the results from direct measurements. We show that both problems can be solved in a framework in … Read More

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We know neutrinos have mass, but we don’t know how they get their masses. Many models augment the Standard Model with right-handed neutrinos, either Dirac or Majorana, to generate the neutrino masses. I will show that in R-symmetric supersymmetric models, the bino and its Dirac partner the singlino can play the role of right-handed neutrinos. In this mechanism the neutrino … Read More

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Experimental searches for Beyond the Standard Model physics with neutrinoless double-beta decay, nuclear recoil from dark matter, proton decay, and other hadronic processes require accurate theoretical modeling of low-energy hadronic dynamics. Lattice QCD, which relies on Monte Carlo simulation of QCD path integrals, can reliably calculate hadronic matrix elements from first principles. I’ll disucss recent applications of lattice QCD to … Read More

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Abstract: A new frontier in the search for dark matter (DM) is based on the idea of detecting the decoherence caused by DM scattering against a mesoscopic superposition of normal matter. Such superpositions are uniquely sensitive to very small momentum transfers from new particles and forces, especially DM with a mass below 100 MeV. Here we investigate what sorts of … Read More