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Spin Depolarization Due to Beam-Beam Interaction in NLC


Calculations of spin depolarization effects due to the beam-beam interaction are presented for several NLC designs. The depolarization comes from both classical (Bargmann-Michel-Telegdi precession) and quantum (Sokolov-Ternov spin-flip) effects. It is anticipated that some physics experiments at future colliders will require a knowledge of the polarization to better than 0.5\% precision. We compare the results of CAIN simulations with the analytic estimates of Yokoya and Chen for head-on collisions.$^\dagger$ We also study the effects of transverse offsets and beamstrahlung-induced energy spread.

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