Upgraded breaking of the HLS model: a full solution to the τ - e+e- and φ decay issues and its consequences on g-2 VMD estimates

被引：73

作者：

Benayoun, M. ^{[1
,2
]}

David, P. ^{[1
,2
]}

DelBuono, L. ^{[1
,2
]}

Jegerlehner, F. ^{[3
,4
]}

机构：

[1] Univ Paris 06, LPNHE, F-75252 Paris, France

[2] Univ Paris 07, CNRS, IN2P3, F-75252 Paris, France

[3] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[4] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2012年 / 72卷 / 01期

关键词：

PION FORM-FACTOR; PI(+)PI(-) CROSS-SECTION; DYNAMICAL GAUGE BOSONS; HIDDEN LOCAL SYMMETRY; RANGE; 600-1380; MEV; HADRONIC CONTRIBUTIONS; CMD-2; DETECTOR; VECTOR-MESONS; ENERGY-RANGE; RADIATIVE-CORRECTIONS;

D O I：

10.1140/epjc/s10052-011-1848-2

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 muon anomalous magnetic moment a(mu) and the hadronic vacuum polarization are examined using data analyzed within the framework of a suitably broken HLS model. The analysis relies on all available scan data samples and leaves provisionally aside the existing ISR data. Our HLS model based global fit approach allows for a better check of consistency between data sets and we investigate how results depend on different strategies which may be followed. Relying on global fit qualities, we find several acceptable solutions leading to ambiguities in the reconstructed value for (a(mu))th. Among these, the most conservative solution is a(mu)(had,LO)[HLS improved] = 687.72(4.63) x 10(-10) and (a(mu))th = 11 659 175.37(5.31) x 10(-10) corresponding to a 4.1 sigma significance for the difference Delta a(mu) = (a(mu))exp - (a(mu))th. It is also shown that the various contributions accessible through the model yield uniformly a factor 2 improvement of their uncertainty. The breaking procedure implemented in the HLS model is an extension of the former procedure based on a mechanism defined by Bando, Kugo and Yamawaki (BKY). This yields a quite satisfactory simultaneous description of most e(+) e(-) annihilation channels up to and including the phi meson (pi(+)pi(-), pi(0)gamma, eta gamma, pi(+)pi(-)pi(0), K+K-, K-0(K) over bar (0)) and of a set of 10 (mostly radiative) decay widths of light mesons. It also allows to achieve the proof of consistency between the e(+)e(-) -> pi(+)pi(-) annihilation and the tau(+/-) -> pi(+/-)pi(0 nu) decay and gives a solution to the reported problem concerning the measured partial width ratio Gamma (phi -> K+K-)/ Gamma (phi -> K-0(K) over bar (0)). Prospects for improving the VMD based estimates of a(mu) are emphasized.

引用

页码：1 / 52

页数：52

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