Neutral pion lifetime measurements and the QCD chiral anomaly

被引：35

作者：

Bernstein, A. M. ^{[1
]}

Holstein, Barry R. ^{[2
]}

机构：

[1] MIT, Dept Phys, Nucl Sci Lab, Cambridge, MA 02139 USA

[2] Univ Massachusetts, Dept Phys LGRT, Amherst, MA 01003 USA

来源：

REVIEWS OF MODERN PHYSICS | 2013年 / 85卷 / 01期

基金：

美国国家科学基金会;

关键词：

NOBEL-LECTURE; PERTURBATION-THEORY; ASYMPTOTIC FREEDOM; VIRTUAL PHOTONS; CURRENT-ALGEBRA; MEAN LIFETIME; COULOMB FIELD; DECAY WIDTH; ETA; PI-0;

D O I：

10.1103/RevModPhys.85.49

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A fundamental property of QCD is the presence of the chiral anomaly, which is the dominant component of the pi(0) -> gamma gamma decay rate. Based on this anomaly and its small (similar or equal to 4.5%) chiral correction, a prediction of the pi(0) lifetime can be used as a test of QCD at confinement scale energies. The interesting experimental and theoretical histories of the pi(0) meson are reviewed, from discovery to the present era. Experimental results are in agreement with the theoretical prediction, within the current (similar or equal to 3%) experimental error; however, they are not yet sufficiently precise to test the chiral corrected result, which is a firm QCD prediction and is known to similar or equal to 1% uncertainty. At this level there exist experimental inconsistencies, which require attention. Possible future work to improve the present precision is suggested. DOI: 10.1103/RevModPhys.85.49

引用

页码：49 / 77

页数：29

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