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Revisit the EDM sensitivity

Revisit the EDM sensitivity. E. Beise, U Maryland. Oct 2007 collaboration meeting Boston, MA. starting points: Golub & Lamoureaux, Phys. Rep. 237 (1994) 1 Section V.H of 2002 pre-proposal Internal report LAUR 02-5924, Van Cleve & Cooper Chibane, etal, Meas. Sci. Tech. 6 (1995) 1671

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Revisit the EDM sensitivity

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  1. Revisit the EDM sensitivity E. Beise, U Maryland Oct 2007 collaboration meeting Boston, MA starting points: Golub & Lamoureaux, Phys. Rep. 237 (1994) 1 Section V.H of 2002 pre-proposal Internal report LAUR 02-5924, Van Cleve & Cooper Chibane, etal, Meas. Sci. Tech. 6 (1995) 1671 Work by V. Ciancolo, Feb 2006 Collab. mtg (Caltech) E. Beise, U Maryland

  2. What have I actually done so far? read a bunch…. talked to people…. E. Beise, U Maryland

  3. Basic considerations Precession frequency shift w/ reversal of electric field:  Statistical uncertainty (no background & uncertainty principle limit): Basic driving equation is: E. Beise, U Maryland

  4. Starting from work of V. Ciancolo • “event” (measurement cycle) generator w/ nominal input parameters • analyzer uses Poisson-distributed data, max log-likelihood • 2-step process: • first determine (smooth) background • 2-parameter fit (Dfedm, f) (only background is from n lifetime in cell, Rb = 2) E. Beise, U Maryland

  5. Vince’s results Frequency shift is masked by hiding sign of E Distribution consistent w/ expected uncertainty with good c2 Input dn reproduced E. Beise, U Maryland

  6. What to do next • Revisit all input parameters • study (spatial and/or temporal) variations in B and E (notes from Vince) • * Additional background scenarios: • Contributions from neutron activation (these are very small in the UCN lifetime experiment)? • notes from Tito (estimated from UCN lifetime) • input neutron distribution from UKy simulations, simulate where the neutrons and g’s go inside vessel • need more information about materials • 3He depolarization, “spin dynamics”? • all suggestions/guidance welcome at present E. Beise, U Maryland

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