content_type = "text/plain"
user_agent = "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
moz = "Mozilla/5.0 "
moz_version = "5"
We describe a measurement of the direct CP asymmetry between inclusive b -> s gamma
and bbar -> sbar gamma decays. This asymmetry is expected to be less than 0.01 in the Standard Model,
but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89 million
BB pairs recorded with the BaBar detector at PEP-II, from which we reconstruct a set
of 12 exclusive b -> s gamma final states containing one charged or neutral kaon and one to three pions.
We measure an asymmetry of A_CP(b -> s gamma) = 0.025 +/- 0.050(stat.) +/- 0.015(syst.),
corresponding to an allowed range of -0.06 < A_CP(b -> s gamma) < +0.11 at 90% confidence level.
|
