##
T-2 Fundamental Symmetries and Neutrinos

utlra cold neutrons, Majorana, supernovae neutrinos, ...

**Probing New Interactions with Neutron Beta Decay
**

GOAL: discover/constrain new BSM interactions originating at the TeV scale through snergy of:

1. Innovative precision measurements (10^-3 level) of neutron decay (n-->peV) at the LANL UCN source

2. Multi-scale theoretical analysis of BSM contributions to n decay: elucidate discovery potential and model discriminating power

**The big picture: energy vs predicion frontier**

Both direct (energy) and indirect (precision) probes will be needed to fully recnstruct the dynamics at the TeV scale

**Theory Program**

**TeV scale:** Analyze generation of new interactions (supersymmetry, extra dimensions, ...)

(Cirigliano, Graesser)

**GeV scale:** Calculate matrix elements (Lattice QCD, Chiral perturbation theory)

(Bhattacharya, Cirigliano, Gupta + PD)

Elucidate implications of neutron measurements for SM extensions, in the context of other precision measurements and collider searches (LHC)

**Topical Collaboration to study "Neutrinos and Nucleosyntesis in Hot and Dense Matter" **(Sanjay Reddy)

DOE funded Mutli-campus collaboration to understand supernova and neutron star phenomena with a specific focus on nuclear and neutrinto theory.

## T-2 Focus Areas