Probing the lepton universality with K±l2 decays

被引：0
|
作者：
Kozhuharov, V.
机构：
[1] Univ Sofia, Fac Phys, Dept Atom Phys, Sofia 1164, Bulgaria
[2] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2007年 / 168卷
关键词：
D O I：
10.1016/j.nuclphysbps.2007.02.038
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The ratio of the decay rates R-K = Gamma(K-+/- -> e(+/-)v)/Gamma(K-+/- -> mu(+/-)v) provides a powerful probe for the weak interaction structure. Recent calculations show its sensitivity to possible presence of New Physics. The value Of RK is calculated with very high precision within the Standard Model, however the achieved accuracy by the previous experiments is two orders of magnitude lower due to the lack of statistics. During two years of data taking at the CERN SPS accelerator, the NA48/2 experiment has collected more than four times the World statistics sample of K-+/- -> e(+/-)v decays allowing to perform a precision measurement of the ratio R-K and to test the theoretical predictions. The preliminary result R-K = (2.416 +/- 0.043(stat) +/- 0.024(syst)) X 10(-5) is presented.
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页码：356 / 359
页数：4
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