scholarly journals Ghost-gluon running coupling, power corrections, and the determination ofΛMS¯

2009 ◽  
Vol 79 (1) ◽  
Author(s):  
Ph. Boucaud ◽  
F. De Soto ◽  
J. P. Leroy ◽  
A. Le Yaouanc ◽  
J. Micheli ◽  
...  
Keyword(s):  
Power Corrections ◽  
Running Coupling

scholarly journals PQCD ANALYSIS OF PARTON-HADRON DUALITY

2011 ◽  
Vol 04 ◽  
pp. 190-199 ◽  
Author(s):  
SIMONETTA LIUTI
Keyword(s):  
Resonance Region ◽  
Infrared Region ◽  
Coupling Constant ◽  
Final State ◽  
Higher Twist Effects ◽  
Power Corrections ◽  
Target Mass ◽  
Running Coupling ◽  
Running Coupling Constant ◽  
Bjorken X

We propose an extraction of the running coupling constant of QCD in the infrared region from experimental data on deep inelastic inclusive scattering at Bjorken x → 1. We first attempt a perturbative fit of the data that extends NLO PQCD evolution to large x values and final state invariant mass, W, in the resonance region. We include both target mass corrections and large x resummation effects. These effects are of order [Formula: see text], and they improve the agreement with the Q2dependence of the data. Standard analyses require the presence of additional power corrections, or dynamical higher twists, to achieve a fully quantitative fit. Our analysis, however, is regulated by the value of the strong coupling in the infrared region that enters through large x resummation effects, and that can suppress, or absorb, higher twist effects. Large x data therefore indirectly provide a measurement of this quantity that can be compared to extractions from other observables.

scholarly journals DIJET EVENT SHAPES AS DIAGNOSTIC TOOLS

2005 ◽  
Vol 20 (16) ◽  
pp. 1187-1201 ◽  
Author(s):  
CAROLA F. BERGER
Keyword(s):  
Diagnostic Tools ◽  
Additional Parameter ◽  
Final States ◽  
Final State ◽  
Power Corrections ◽  
Continuous Parameter ◽  
Running Coupling ◽  
Event Shapes ◽  
Hadronic Final States ◽  
Extract Information

Event shapes have long been used to extract information about hadronic final states and the properties of QCD, such as particle spin and the running coupling. Recently, a family of event shapes, the angularities, has been introduced that depends on a continuous parameter. This additional parameter-dependence further extends the versatility of event shapes. It provides a handle on nonperturbative power corrections, on non-global logarithms, and on the flow of color in the final state.

POWER CORRECTIONS TO THE PION–PHOTON TRANSITION FORM FACTOR Fπγ(Q2)

2001 ◽  
Vol 16 (18) ◽  
pp. 3179-3190 ◽  
Author(s):  
SHAHIN S. AGAEV ◽  
ABDULLA I. MUKHTAROV
Keyword(s):  
Form Factor ◽  
Transition Form Factor ◽  
Renormalization Scale ◽  
Transition Form ◽  
Coupling Constant ◽  
Electromagnetic Transition ◽  
Power Corrections ◽  
Model Distribution ◽  
Running Coupling ◽  
Running Coupling Constant

Power-suppressed corrections ~(1/Q2)p, p = 1,2… to the electromagnetic transition form factor Q2Fπγ(Q2) are estimated using the running coupling constant method. Within this method the renormalization scale in the QCD expression for Fπγ(Q2) is taken to be equal to [Formula: see text] (or to [Formula: see text]) and computation of the form factor with running coupling [Formula: see text] is carried out. In calculations the pion asymptotic and model distribution amplitudes (DAs), as well as DAs found in the context of the "naive non-Abelianization" approximation are employed. Comparisons are made with frozen coupling constant approximation results and with the experimental data.

scholarly journals Running coupling and power corrections in non-linear evolution at the high-energy limit

2007 ◽  
Vol 784 (1-4) ◽  
pp. 282-340 ◽  
Author(s):  
Einan Gardi ◽  
Janne Kuokkanen ◽  
Kari Rummukainen ◽  
Heribert Weigert
Keyword(s):  
High Energy ◽  
Energy Limit ◽  
High Energy Limit ◽  
Linear Evolution ◽  
Power Corrections ◽  
Running Coupling ◽  
Non Linear

scholarly journals Spontaneous chiral symmetry breaking in the massive Landau gauge: Realistic running coupling

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
Marcela Peláez ◽  
Urko Reinosa ◽  
Julien Serreau ◽  
Matthieu Tissier ◽  
Nicolás Wschebor
Keyword(s):  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Chiral Symmetry Breaking ◽  
Landau Gauge ◽  
Spontaneous Chiral Symmetry Breaking ◽  
Running Coupling
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