Precision Determination of Electroweak Coupling from Atomic Parity Violation and Implications for Particle Physics

被引：229

作者：

Porsev, S. G. ^{[1
,2
]}

Beloy, K. ^{[1
]}

Derevianko, A. ^{[1
]}

机构：

[1] Univ Nevada, Dept Phys, Reno, NV 89557 USA

[2] Petersburg Nucl Phys Inst, Gatchina 188300, Russia

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 18期

关键词：

HIGH-ACCURACY CALCULATION; STANDARD MODEL; LIFETIME MEASUREMENTS; CESIUM; TRANSITION; CS; NONCONSERVATION; AMPLITUDE;

D O I：

10.1103/PhysRevLett.102.181601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We carry out high-precision calculation of parity violation in a cesium atom, reducing theoretical uncertainty by a factor of 2 compared to previous evaluations. We combine previous measurements with calculations and extract the weak charge of the Cs-133 nucleus, Q(W)=-73.16(29)(expt)(20)(theor). The result is in agreement with the standard model (SM) of elementary particles. This is the most accurate to-date test of the low-energy electroweak sector of the SM. In combination with the results of high-energy collider experiments, we confirm the energy dependence (or "running") of the electroweak force over an energy range spanning 4 orders of magnitude (from similar to 10 MeV to similar to 100 GeV). Additionally, our result places constraints on a variety of new physics scenarios beyond the SM. In particular, we increase the lower limit on the masses of extra Z bosons predicted by models of grand unification and string theories.

引用

页数：4

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