scholarly journals IMPACT OF γV-VERTEX CORRECTIONS ON THE ωπ0γ AND ϕπ0γ TRANSITION FORM FACTORS

2014 ◽  
Vol 35 ◽  
pp. 1460459
Author(s):  
SERGII RASPOPOV
Keyword(s):  
Field Theory ◽  
Form Factor ◽  
Vector Meson ◽  
Effective Field Theory ◽  
Form Factors ◽  
Effective Field ◽  
Lepton Pair ◽  
Transition Form ◽  
Vertex Corrections ◽  
Conversion Transition

The aim of this paper is to present an effective field theory description of the conversion transition of the vector meson V into the pseudoscalar P and the lepton-pair l+l-. The normalized form factor for ω → π0γ* transition is presented and compared to the available data and to the predictions of other models.

scholarly journals EFT anomalous dimensions from the S-matrix

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Joan Elias Miró ◽  
James Ingoldby ◽  
Marc Riembau
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Form Factors ◽  
Effective Field ◽  
Higher Dimension ◽  
Powerful Method ◽  
Loop Contribution ◽  
Anomalous Dimensions ◽  
S Matrix ◽  
The Standard Model

Abstract We use the on-shell S-matrix and form factors to compute anomalous dimensions of higher dimension operators in the Standard Model Effective Field Theory. We find that in many instances, these computations are made simple by using the on-shell method. We first compute contributions to anomalous dimensions of operators at dimension-six that arise at one-loop. Then we calculate two-loop anomalous dimensions for which the corresponding one-loop contribution is absent, using this powerful method.

scholarly journals Effective field theory description of the pion form factor

1997 ◽  
Vol 412 (3-4) ◽  
pp. 382-388 ◽  
Author(s):  
Francisco Guerrero ◽  
Antonio Pich
Keyword(s):  
Field Theory ◽  
Form Factor ◽  
Effective Field Theory ◽  
Pion Form Factor ◽  
Effective Field

scholarly journals Nucleon electromagnetic form factors on the lattice and in chiral effective field theory

2005 ◽  
Vol 71 (3) ◽  
Author(s):  
M. Göckeler ◽  
T. R. Hemmert ◽  
R. Horsley ◽  
D. Pleiter ◽  
P. E. L. Rakow ◽  
...  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Form Factors ◽  
Effective Field ◽  
Electromagnetic Form Factors ◽  
Chiral Effective Field Theory

scholarly journals A FB in the SMEFT: precision Z physics at the LHC

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Víctor Bresó-Pla ◽  
Adam Falkowski ◽  
Martín González-Alonso
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
Precision Measurements ◽  
Vertex Corrections ◽  
The Standard Model ◽  
Electroweak Precision

Abstract We study the forward-backward asymmetry AFB in pp → ℓ+ℓ− at the Z peak within the Standard Model Effective Field Theory (SMEFT). We find that this observable provides per mille level constraints on the vertex corrections of the Z boson to quarks, which close a flat direction in the electroweak precision SMEFT fit. Moreover, we show that current AFB data is precise enough so that its inclusion in the fit improves significantly LEP bounds even in simple New Physics setups. This demonstrates that the LHC can compete with and complement LEP when it comes to precision measurements of the Z boson properties.

scholarly journals Vector form factor of the pion in chiral effective field theory

2015 ◽  
Vol 742 ◽  
pp. 55-60 ◽  
Author(s):  
D. Djukanovic ◽  
J. Gegelia ◽  
A. Keller ◽  
S. Scherer ◽  
L. Tiator
Keyword(s):  
Field Theory ◽  
Form Factor ◽  
Effective Field Theory ◽  
Effective Field ◽  
Vector Form Factor ◽  
Vector Form ◽  
Chiral Effective Field Theory
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