Toward a First-Principles Calculation of Electroweak Box Diagrams - INSPIRE

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Toward a First-Principles Calculation of Electroweak Box Diagrams

Chien-Yeah Seng
(
- Bonn U. and
- Bonn U., HISKP
)
,
Ulf-G Meißner
(
- Bonn U. and
- Bonn U., HISKP and
- IAS, Julich and
- JCHP, Julich and
- Tbilisi State U.
)

Mar 19, 2019

6 pages

Published in:

Phys.Rev.Lett. 122 (2019) 21, 211802

Published: May 29, 2019

e-Print:

1903.07969 [hep-ph]

DOI:

10.1103/PhysRevLett.122.211802 (publication)

View in:

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Abstract: (APS)

We derive a Feynman-Hellmann theorem relating the second-order nucleon energy shift resulting from the introduction of periodic source terms of electromagnetic and isovector axial currents to the parity-odd nucleon structure function F3N. It is a crucial ingredient in the theoretical study of the γW and γZ box diagrams that are known to suffer from large hadronic uncertainties. We demonstrate that for a given Q2 one only needs to compute a small number of energy shifts in order to obtain the required inputs for the box diagrams. Future lattice calculations based on this approach may shed new light on various topics in precision physics including the refined determination of the Cabibbo-Kobayashi-Maskawa matrix elements and the weak mixing angle.

Note:

Version to appear in PRL

Elementary Particles and Fields
electroweak interaction
nucleon: structure function
nucleon: energy
current: electromagnetic
current: axial
Weinberg angle
CKM matrix
loop integral: 4
quantum chromodynamics: lattice

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