Relativistic, model-independent determination of electromagnetic finite-size effects beyond the pointlike approximation : Relativistic, model-independent determination of electromagnetic finite-size effects beyond the pointlike approximation

Summary, in English

We present a relativistic and model-independent method to derive structure-dependent electromagnetic finite-size effects. This is a systematic procedure, particularly well-suited for automation, which works at arbitrarily high orders in the large-volume expansion. Structure-dependent coefficients appear as zero-momentum derivatives of physical form factors which can be obtained through experimental measurements or auxiliary lattice calculations. As an application we derive the electromagnetic finite-size effects on the pseudoscalar meson mass and leptonic decay amplitude, through orders O(1/L3) and O(1/L2), respectively. The structure dependence appears at this order through the meson charge radius and the real radiative leptonic amplitude, which are known experimentally.

• Author: Nils Hermansson-Truedsson; Antonin Portelli; Mawell T. Hansen; Matteo Di Carlo
• Publishing year: 2022
• Language: English
• Publication/Series: Physical Review D
• Links: http://dx.doi.org/10.1103/PhysRevD.105.074509
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 2470-0010