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Ultra-Cold Neutron Group in Kellogg Lab - Neutron Electric Dipole Moment (EDM) Experiment - Search for new CP violation - Neutron Decay - Precision measurements.

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Presentation on theme: "Ultra-Cold Neutron Group in Kellogg Lab - Neutron Electric Dipole Moment (EDM) Experiment - Search for new CP violation - Neutron Decay - Precision measurements."— Presentation transcript:

1 Ultra-Cold Neutron Group in Kellogg Lab - Neutron Electric Dipole Moment (EDM) Experiment - Search for new CP violation - Neutron Decay - Precision measurements probe mass scales > TeV Undergrads: Anita Kulkarni, Daniel Molina, Adam Weller Grads: Marie Blatnik, Xuan Sun Postdocs: Simon Slutsky, Chris Swank, Kevin Hickerson Technical Staff: Bob Carr, Chub Osthelder Faculty: Brad Filippone

2 Ultra-Cold Neutrons (UCN) (Fermi/Zeldovich) What are UCN ? – Very slow neutrons (v 500 Å ) that cannot penetrate into certain materials Neutrons can be trapped and studied  Electric Dipole Moment (EDM)  Decay properties

3 UCN from Source UCNA experimental setup @ Los Alamos 1-Tesla solenoidal spectrometer 7-Tesla polarizing magnets AFP spin flipper electron detectors muon vetoes Spectrometer, detectors, DAQ from Caltech Precision Measurement of Neutron Decay with Polarized Ultracold Neutrons UCN beamline

4 Neutron EDM Violates Time Reversal Symmetry? Consider: free neutron with EDM + - + - Assume neutron has spin angular momentum and dipole moment parallel This particle is a distinguishable neutron  it doesn’t exist ஃ Violates time reversal symmetry T-violation implies CP violation via CPT Theorem

5 Impact of non-zero EDM Must be new Physics Sharply constrains models beyond the Standard Model (especially with LHC data) May account for matter- antimatter asymmetry of the universe 5 Gray shaded region is excluded New nEDM at 3x10 -28 e-cm moves limits off graph (> 1000 TeV) Phys. Rev D 87.113002 (2013)

6 New EDM Experiment Uses Super-fluid Helium to make trapped Ultra-Cold Neutrons >2 orders-of-magnitude improvement in sensitivity is possible Collaboration of 16 Institutions (mostly US) BWF is Spokesperson for Collaboration Magnets and magnetic shields built & tested at Caltech Then to Oak Ridge National Lab for neutrons

7 nEDM Sensitivity vs Time 20002010 Future neutron EDM 1950 7

8 Possible Future Projects Design and build neutron EDM experiment – Explore improved measurement techniques E.g. “spin dressing” of polarized neutrons and 3 He – Construction at Caltech for next 2 yrs then measurements at Oak Ridge Search for new scalar or tensor interactions (via neutron decay) Precision measurement of neutron lifetime EDM lab tour: Fri. 3-4 PM in Synchrotron Lab

9 Synchrotron Lab You are HERE N

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