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Measurement of the direct CP asymmetry in b-->s gamma Decays |
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| Authors: | Aubert B Barate R Boutigny D Couderc F Gaillard J M Hicheur A Karyotakis Y Lees J P Tisserand V Zghiche A Palano A Pompili A Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Ofte I Stugu B Abrams G S Borgland A W Breon A B Brown D N Button-Shafer J Cahn R N Charles E Day C T Gill M S Gritsan A V Groysman Y Jacobsen R G Kadel R W Kadyk J Kerth L T Kolomensky Yu G Kukartsev G LeClerc C Lynch G Merchant A M Mir L M Oddone P J Orimoto T J Pripstein M Roe N A Ronan M T Shelkov V G Wenzel W A Ford K Harrison T J Hawkes C M Morgan S E Watson A T Fritsch M Goetzen K Held T Koch H Lewandowski B |
| Institution: | Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France. |
| Abstract: | We describe a measurement of the direct CP asymmetry between inclusive b-->s gamma and b-->s 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 x 10(6) BB pairs recorded with the BABAR detector at SLAC 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 |
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