[Theory-seminars] Seminar tomorrow

[Raza Sufian]

Dear all,

Here is a reminder for the theory seminar tomorrow:

Theory seminar:
Monday, March 18th, 1:00PM, Room L102
Andrea Schindler (Michigan State University), "Nucleon Electric Dipole Moment results from lattice QCD using the Gradient Flow"

Abstract: 
The electric dipole moments (EDMs) of the neutron and proton are very sensitive probes of CP-violating sources beyond those contained in the Standard Model (SM). In fact, the current bound on the neutron EDM strongly constrains many models of beyond-the-SM (BSM) physics. At current experimental accuracies, a nonzero nucleon EDM cannot be accounted for by the phase in the quark-mass matrix. This implies that such a signal is either caused by a nonzero QCD theta term, or by genuine BSM physics which, at low energies, can be parametrized in terms of higher- dimensional CP-violating quark-gluon operators. I will present recent results we have obtained from lattice QCD for the nucleon EDM induced by the theta term in QCD, by the quark-chromo and by the Weinberg operator. A key tool for our calculation is the use of the Gradient Flow. I will clarify the importance of the Gradient Flow in renormalizing the CP-violating operators and discuss the difficulties and pitfalls that an EDM lattice QCD calculation entails.

Thank you.

Carlota, Vincent and Raza

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