Tübingen 2003 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 38: Elektromagnetische und hadronische Proben VI
HK 38.7: Talk
Thursday, March 20, 2003, 15:00–15:15, B
Search for Time Reversal Violating Effects in the Decay of Free Neutrons — •A. Kozela1,2, M. Beck3, A. Bialek4, K. Bodek4, T. Brys4,5, A. Czarnecki6, W. Fetcher1, P. Gorel7, K. Kirch5, S. Kistryn4, A. Lindroth3, O. Naviliat7, J. Pulut4,5, A. Serebrov8, N. Severijns3, E. Stephan4, and J. Zejma4 — 1IPP, ETH, Zürich — 2Institute of Nuclear Physics, Cracow — 3Catholic University, Leuven — 4Institute of Physics, UJ, Cracow — 5PSI, Villigen — 6University of Alberta, Edmonton — 7Laboratoire de Physique Corpusculaire, Caen — 8St. Petersburg Nuclear Physics Institute, Gatchina
An experiment aiming at the simultaneous determination of both components of the transversal polarization of electrons emitted in the decay of free, polarized neutrons is underway at the cold neutron facility FUNSPIN at the spallation source SINQ, PSI, Switzerland. A non-zero value of the electron polarization component pT2 perpendicular to the plane spanned by the neutron polarization and the electron momentum would signal the Time Reversal Symmetry Violation and thus physics beyond the Standard Model (SM). The component pT1 conserves time symmetry and is finite in SM. The measurement of its value will serve as an internal calibration of the apparatus and cross check of systematic uncertainties. We estimate that such an experiment with the absolute accuracy of 0.005 is feasible within a few weeks of data taking. This will be the first such measurement for the decay of free neutrons, bearing a potential to either a nonstandard value or to provide important constraints for the scalar and tensor coupling in the semileptonic interactions.