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PKU HEP Seminar and Workshop (北京大学高能物理组)

"Dark" Series Colloquium 3# The TESSERACT Project for Direct Detection of Sub-GeV Dark Matter

by Prof. Dan Mckinsy (University of California, Berkeley)

Thursday, June 10, 2021 from to (Asia/Shanghai)

The TESSERACT project is currently in a planning phase, funded under the DOE Dark Matter New Initiatives program, and aims to produce fully defined experiments (dubbed HeRALD and SPICE) that will explore DM mass parameter space down to 10 MeV, with upgrade paths to sub-MeV. It will be sensitive to both nuclear recoil DM (NRDM) and electron recoils (ERDM). An initial period of targeted R&D is needed to make technical choices and retire technical risks, leading to a well-defined set of design parameters with baseline values. Multiple target materials will be used, sharing identical readout. In addition to maximizing sensitivity to a variety of DM interactions, this provides an independent handle on instrumental backgrounds. The HeRALD experiment will use superfluid helium as a target material. Helium, with its light mass, has good NRDM sensitivity, but minimal sensitivity to low-mass dark photons. The SPICE experiment will use polar crystals, which will ultimately have the best sensitivity to dark photon mediated DM, but require lower energy thresholds than LHe for the same NRDM reach. Scintillating crystals such as GaAs have sensitivity to ERDM with kinetic energy greater than the electronic bandgap of the material. Both LHe and GaAs produce scintillation light as well as phonon signals, and the relative timing and signal strengths may be used to reduce both instrumental backgrounds and those due to radioactivity.

Dan Mckinsey is the Georgia Lee Distinguished Professor at the University of California, Berkeley. He also is a senior faculty scientist at Lawrence Berkeley National Laboratory (LBNL). He has been the co-spokesperson of the LUX (Large Underground Xenon) dark matter experiment and has been the collaborator of the LUX-ZEPLIN dark matter experiment. He completed his BSc at the University of Michigan with the highest honors in 1995. In 2002, he received his Ph.D. at Harvard University. He conducted two years of postdoc research at Princeton University. In 2003, he professed at Yale University until 2015. He moved to Berkeley in the same year. Beyond liquid xenon experiments, he has other research activities: R&D program of hunting light DM with superfluid helium and detection of gamma rays and fast neutrons with liquefied noble gases.

https://zoom.com.cn/j/96357968034?pwd=K2REeGF0V2dqOElRd09hVGVRcDk4Zz09 or https://cern.zoom.us/j/96357968034?pwd=K2REeGF0V2dqOElRd09hVGVRcDk4Zz09

Meeting ID: 963 5796 8034
Password: 125125

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