Adolfo del Campo
Quantum Lunch Location:
T-Division Conference Room, TA-3,
Building 123, Room 121
Quantum Institute: Visitor Schedule
The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
The organizing committee includes Malcolm Boshier (P-21), Adolfo del Campo (T-4 & CNLS), Michael Di Rosa (C-PCS), Armin Rahmanisisan (T-4 & CNLS), Changhyun Ryu (P-21) , Nikolai Sinitsyn (T-4), Rolando Somma (T-4), Christopher Ticknor (T-1), and Wojciech Zurek (T-4).
For more information, or to nominate a speaker, contact Adolfo del Campo.
To add your name to the Quantum Lunch email list, contact Ellie Vigil.
Thursday February 20, 2014
12:30 PM - 2:00 PM
Speaker: Paul Hess (Harvard University)
Technical Host: Michael Di Rosa
TOPIC: How round is the electron? An improved limit on the electron's electric dipole moment
Abstract: The Standard Model (SM) of particle physics fails to explain dark matter and the current matter-antimatter asymmetry of the universe. Extensions to the SM, such as weak-scale Supersymmetry, may explain these phenomena by positing the existence of new particles and interactions that are asymmetric under time-reversal (T). These theories nearly always predict an electron electric dipole moment (EDM), a T-violating asymmetric charge distribution along the electron's spin. I will discuss the ACME collaboration's newly completed EDM search using the polar molecule thorium monoxide (ThO). We performed a spin precession measurement on a cold beam of ThO, looking for the E-field correlations typical for an EDM. A large internal electric field and unique molecular structure provided statistical precision and rejection of common systematics. The result is an upper limit consistent with zero, which is an order of magnitude improvement in sensitivity compared to the previous best limits. Our result constrains T-violating physics at the TeV energy scale, comparable to those studied at the LHC.