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

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>CP</mml:mi></mml:math>violation at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo>)</mml:mo><mml:mn /></mml:math>without time ordering or<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi><mml:mi>t</mml:mi></mml:math>

Measurement ofCPviolation at theΥ(4S)without time ordering orΔt