Measurement of CP Violation at the ${\rm Y}(4S)$ without Time Ordering or $\Delta t$

Abstract

I derive the expressions for the CP-violating asymmetry arising from interference between mixed and direct decays in the Upsilon(4S) system, for the case in which only one of the B decay times is observed, integrating over the decay time of the other B. I observe that neither the difference of the decay times Delta t, nor even their time-ordering, need be detected. A technique for measurement of the CP-violating weak decay parameter sin(2beta) is described which exploits this observation.

Comments: 9 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS