Pion vector form factor from lattice QCD at the physical point

Alexandrou, C.; Bacchio, S.; Dimopoulos, P.; Finkenrath, J.; Frezzotti, R.; Jansen, K.; Kostrzewa, B.; Mangin-Brinet, M.; Sanfilippo, F.; Simula, S.; Urbach, C.; Wenger, Urs (2018). Pion vector form factor from lattice QCD at the physical point. Physical review. D - particles, fields, gravitation, and cosmology, 97(1) American Physical Society 10.1103/PhysRevD.97.014508

[img]
Preview
Text
PhysRevD.97.014508.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (862kB) | Preview

We present an investigation of the electromagnetic pion form factor, FπðQ2Þ, at small values of the four- momentum transfer Q2 (≲0.25 GeV2), based on the gauge configurations generated by the European Twisted Mass Collaboration with Nf = 2 twisted-mass quarks at maximal twist including a clover term. Momentum is injected using nonperiodic boundary conditions and the calculations are carried out at a fixed lattice spacing (a ≃ 0.09 fm) and with pion masses equal to its physical value, 240 MeV and 340 MeV. Our data are successfully analyzed using chiral perturbation theory at next-to-leading order in the light-quark mass. For each pion mass two different lattice volumes are used to take care of finite size effects. Our final result for the squared charge radius is hr2iπ = 0.443ð29Þ fm2, where the error includes several sources of systematic errors except the uncertainty related to discretization effects. The corresponding value of the SU(2) chiral low-energy constant l ̄6 is equal to l ̄6 = 16.2ð1.0Þ.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Wenger, Urs

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

02 Mar 2018 12:32

Last Modified:

25 Oct 2019 14:18

Publisher DOI:

10.1103/PhysRevD.97.014508

ArXiv ID:

1710.10401

BORIS DOI:

10.7892/boris.111849

URI:

https://boris.unibe.ch/id/eprint/111849

Actions (login required)

Edit item Edit item
Provide Feedback