Pion transition form factor from twisted-mass lattice QCD and the hadronic light-by-light ir0-pole contribution to the muon g-2

被引：7

作者：

Alexandrou, C. ^{[1
,2
]}

Bacchio, S. ^{[2
]}

Bergner, G. ^{[3
]}

Burri, S. ^{[4
]}

Finkenrath, J. ^{[2
,5
]}

Gasbarro, A. ^{[4
]}

Hadjiyiannakou, K. ^{[1
,2
]}

Jansen, K. ^{[6
]}

Kanwar, G.

Kostrzewa, B. ^{[7
]}

Koutsou, G.

Ottnad, K. ^{[8
,9
]}

Petschlies, M. ^{[10
,11
]}

Pittler, F. ^{[2
]}

Steffens, F. ^{[10
,11
]}

Urbach, C. ^{[10
,11
]}

Wenger, U. ^{[4
]}

机构：

[1] Univ Cyprus, Dept Phys, CY-20537 Nicosia, Cyprus

[2] Cyprus Inst, Computat Based Sci & Technol Res Ctr, 20 Konstantinou Kavafi St, CY-2121 Nicosia, Cyprus

[3] Univ Jena, Inst Theoret Phys, Max Wien Pl 1, D-07743 Jena, Germany

[4] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

[5] Berg Univ Wuppertal, Gaussstr 20, D-42119 Wuppertal, Germany

[6] Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany

[7] Rhein Friedrich Wilhelms Univ Bonn, High Performance Comp & Analyt Lab, Friedrich Hirzebruch Allee 8, D-53115 Bonn, Germany

[8] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany

[9] Johannes Gutenberg Univ Mainz, Inst Kernphys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany

[10] Rheinische Friedrich Wilhelms Univ Bonn, HISKP Theory, Nussallee 14-16, D-53115 Bonn, Germany

[11] Rhein Friedrich Wilhelms Univ Bonn, Bethe Ctr Theoret Phys, Wegelerstr 10, D-53115 Bonn, Germany

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 09期

基金：

瑞士国家科学基金会; 欧盟地平线“2020”;

关键词：

EXCLUSIVE PROCESSES; SUM-RULES; QUANTUM; EQUATIONS; SYSTEMS; PHOTON; TRACE;

D O I：

10.1103/PhysRevD.108.094514

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor F pi 0 gamma gamma(q21; q22). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCD. We report our results for the transition form factor parametrized using a model-independent conformal expansion valid for arbitrary spacelike kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g - 2, finding a pi 0-pole mu = 56.7(3.2) x 10-11.

引用

页数：23

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