科研之友
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摘要
The recent measurement of an anomalous like-sign dimuon asymmetry by the D0 collaboration has prompted theoretical speculation on possible sources of physics beyond the standard model that may affect lifetimes and lifetime differences in neutral B meson systems. One observable that deserves closer attention is the width difference in the B-d(0) system, Delta Gamma(d). Since the standard model prediction for this quantity is well below 1%, it serves as a 'null test' whereby the measurement of a larger value would cleanly reveal the presence of new physics. Methods to measure Delta Gamma(d) at current and future experiments are reviewed and an attractive new approach is proposed.
- 出版日期2011-1
