Pheno & Vino | Carlos Blanco, U of Chicago | "New Constraints on Dark Matter from Organic Targets: What Organic Chemistry Can do for Direct Detection" | Zoom link:

Tue, Apr 21, 2020, 4:00 pm
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As the age of WIMP-scale dark matter (DM) draws to a close thanks to the ever-increasing sensitivity of direct detection experiments, the majority of sub-GeV DM parameter space remains to be explored. Sub-GeV DM can excite electronic transitions in a variety of molecular and nano-scale systems which have sub-eV scale thresholds. In particular, organic molecules, nanoparticles, and solvated electrons can be used to detect the low momentum recoils of dark matter with electrons and nuclei. Aromatic molecules such as benzene or xylene have an electronic excitation energy of a few eV, making them  sensitive to DM as light as a few MeV. These compounds are often used as solvents in organic scintillators, where the de-excitation process  leads  to  a  photon  which  propagates  until  it  is  absorbed  and  re-emitted by  a  dilute  fluor whose emission is not absorbed by the bulk and thus reaches a photomultiplier tube (PMT), Here,we develop the formalism for DM-electron scattering in aromatic organic molecules, calculate the expected sensitivity to DM-electron scattering in benzene and p-xylene, and apply this calculation to EJ-301.

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