Recent results on kaon decays by the NA48/2 experiment at CERN

被引：0
|
作者：
Bloch-Devaux, Brigitte [1 ]
Venditti, Stefano [1 ]
机构：
[1] CERN, CH-1211 Geneva 23, Switzerland
来源：
HYPERFINE INTERACTIONS | 2016年 / 237卷
关键词：
Flavour physics; Kaon physics; Rare decays; Dark photon; SEARCH;
D O I：
10.1007/s10751-016-1318-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
The NA48/2 experiment reports the first observation of the rare decay K (+/-) -> pi (+/-) pi (0) e (+) e (-), based on about 2000 candidates from 2003 data. The preliminary branching ratio in the full kinematic region is . A sample of 4.687 x 10(6) events collected in 2003/4 is analyzed to search for the dark photon () via the decay chain K (+/-) -> pi (+/-) pi (0), , . No signal is observed, limits in the plane mixing parameter epsilon (2) versus its mass are reported.
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