Belle studies of CP violation in B → ππ decays

被引：0

作者：

Itoh, Ryosuke ^{[1
]}

机构：

[1] High Energy Accelerator Res Org, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan

来源：

EUROPEAN PHYSICAL JOURNAL C | 2004年 / 33卷 / Suppl 1期

关键词：

Violation Parameter; Belle Detector; Belle Study;

D O I：

10.1140/epjcd/s2004-03-1641-1

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：

A measurement of CP violating asymmetries in B-0 -> pi(+)pi(-) decays in a data sample of 78 fb(-1) is presented. The data are taken on Gamma (4S) resonance with the Belle detector in the KEKB asymmetry e(+) e(-) collider. A time-dependent analysis is performed for 740 reconstructed B-0 -> pi(+)pi(-) candidates and the CP violation parameters are obtained to be A(pi pi) = +0.77 +/- 0.27 +/- 0.08 and S-pi pi = -1.23 +/- 0.41(-0.07)(+0.08). The result rules out the CP- conservation hypothesis (A(pi pi) = 0, S-pi pi = 0) at 3.4 sigma.

引用

页码：S370 / S372

页数：3

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