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Revisit the EDM sensitivity

This report outlines the discussions and findings from the EDM sensitivity collaboration meeting held by E. Beise at the University of Maryland in October 2007. Key starting points include references to works by Golub & Lamoureaux and Van Cleve & Cooper. The meeting focused on the statistical uncertainties, measurement cycles, and the impact of electric and magnetic fields on precession frequency shifts. Future steps involve revisiting input parameters and understanding spatial and temporal variations in fields, alongside additional background scenarios relevant to neutron activation.

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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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