Diagnostic for new physics in B -> pi K decays

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题名:	Diagnostic for new physics in B -> pi K decays
作者:	Baek,S;Chiang,CW;Gronau,M;London,D;Rosner,JL
贡献者:	物理研究所
关键词:	ELECTROWEAK PENGUIN;ISOSPIN ANALYSIS;CP ASYMMETRIES;SUM-RULE;PARAMETERS;VIOLATION;MESONS;PUZZLE;GAMMA;PHASE
日期:	2009
上传时间:	2010-07-08 13:59:23 (UTC+8)
出版者:	中央大學
摘要:	A recent analysis of B 7 K decays concludes that present data do not clearly indicate whether (i) the standard model (or Delta l= 0 new physics) is sufficient. or (ii) Delta l = 1 new physics is needed. We show that these two possibilities can be distinguished by whether a sum rule relating the CP asymmetries of the four B -> pi K decays is valid. If case (i) is favored, the sum rule holds, and one predicts A(Cp)(pi K-0(0)) = -0,15, while in case (ii) fits to new physics involving large values of a color-suppressed tree amplitude entail A(Cp)(pi K-0(0)) = -0.03. The Current experimental average A(Cp)(pi K-0(0)) = -0.01 +/- 0.10 must be measured a factor of at least three times more precisely in order to distinguish between the two cases. (C) 2009 Elsevier B.V. All rights reserved.
關聯:	PHYSICS LETTERS B
显示于类别:	[物理研究所] 期刊論文

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