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Study of the branching ratio and charge asymmetry for the decay K-S -> pi e nu with the KLOE detector
KLOE Collaboration
2006
发表期刊PHYSICS LETTERS B
卷号636期号:3--4页码:173-182
通讯作者Gatti, C (reprint author), Ist Nazl Fis Nucl, Lab Nazl Frascati, Casella Postale 13, I-00044 Frascati, ROMA, Italy.
摘要Among some 400 million KSKL pairs produced in e(+)e(-) annihilations at DA Phi DNE, similar to 6500 each of K-S -> pi(+)e(-)(v) over bar and K-S -> pi(-)e(+)v decays have been observed with the KLOE detector. From these, the ratio Gamma(K-S -> pi ev)/Gamma(K-S -> pi(+)pi(-)) = (10.19 +/- 0.13) x 10(-4) is obtained, improving the accuracy on BR(K-S -> pi ev) by a factor of four and providing the most precise test of the Delta S = Delta Q rule. From the partial width F(K-S -> pi ev), a value for f(+)(K0) (0) x V-us is obtained that is in agreement with unitarity of the quark-mixing matrix. The lepton charge asymmetry A(S) = (1.5 +/- 9.6(stat) 2.9(syst)) x 10(-3) is compatible with the requirements of CPT invariance. The form-factor slope agrees with recent results from semileptonic K-L and K+ decays. These are the first measurements of the charge asymmetry and form-factor slope for semileptonic K-S decays. (c) 2006 Elsevier B.V. All rights reserved.
关键词TAGGED NEUTRAL KAONS FORM-FACTORS LIFETIME SYSTEM
学科领域Physics
DOI10.1016/j.physletb.2006.03.047
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000237506900005
引用统计
被引频次:56[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212660
专题实验物理中心
作者单位中国科学院高能物理研究所
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KLOE Collaboration. Study of the branching ratio and charge asymmetry for the decay K-S -> pi e nu with the KLOE detector[J]. PHYSICS LETTERS B,2006,636(3--4):173-182.
APA KLOE Collaboration.(2006).Study of the branching ratio and charge asymmetry for the decay K-S -> pi e nu with the KLOE detector.PHYSICS LETTERS B,636(3--4),173-182.
MLA KLOE Collaboration."Study of the branching ratio and charge asymmetry for the decay K-S -> pi e nu with the KLOE detector".PHYSICS LETTERS B 636.3--4(2006):173-182.
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