scholarly journals Inclusive and exclusive processes with a leading neutron in ep collisions

2016 ◽  
Author(s):  
Victor Goncalves ◽  
F. Carvalho ◽  
F. Navarra ◽  
D. Spiering
Keyword(s):  
Leading Neutron ◽  
Exclusive Processes

scholarly journals Exclusive processes with a leading neutron inepcollisions

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
V. P. Gonçalves ◽  
F. S. Navarra ◽  
D. Spiering
Keyword(s):  
Leading Neutron ◽  
Exclusive Processes

scholarly journals Perturbative QCD analysis of exclusive processes e+e−→VP and e+e−→TP

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
Cai-Dian Lü ◽  
Wei Wang ◽  
Ye Xing ◽  
Qi-An Zhang
Keyword(s):  
Perturbative Qcd ◽  
Qcd Analysis ◽  
Exclusive Processes

scholarly journals Optimal renormalization scale and scheme for exclusive processes

1998 ◽  
Vol 57 (1) ◽  
pp. 245-252 ◽  
Author(s):  
Stanley J. Brodsky ◽  
Chueng-Ryong Ji ◽  
Alex Pang ◽  
David G. Robertson
Keyword(s):  
Renormalization Scale ◽  
Exclusive Processes

scholarly journals Light-cone distribution amplitudes of light mesons with QED effects

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Martin Beneke ◽  
Philipp Böer ◽  
Jan-Niklas Toelstede ◽  
K. Keri Vos
Keyword(s):  
Light Cone ◽  
Electromagnetic Coupling ◽  
First Order ◽  
Order Expansion ◽  
Group Evolution ◽  
Fixed Order ◽  
Light Mesons ◽  
Charged Mesons ◽  
Qed Effects ◽  
Exclusive Processes

Abstract We discuss the generalization of the leading-twist light-cone distribution amplitude for light mesons including QED effects. This generalization was introduced to describe virtual collinear photon exchanges at the strong-interaction scale ΛQCD in the factorization of QED effects in non-leptonic B-meson decays. In this paper we study the renormalization group evolution of this non-perturbative function. For charged mesons, in particular, this exhibits qualitative differences with respect to the well-known scale evolution in QCD only, especially regarding the endpoint-behaviour. We analytically solve the evolution equation to first order in the electromagnetic coupling αem, which resums large logarithms in QCD on top of a fixed-order expansion in αem. We further provide numerical estimates for QED corrections to Gegenbauer coefficients as well as inverse moments relevant to (QED-generalized) factorization theorems for hard exclusive processes.

scholarly journals Gauge invariance and kT-factorization of exclusive processes

2009 ◽  
Vol 674 (3) ◽  
pp. 176-181 ◽  
Author(s):  
F. Feng ◽  
J.P. Ma ◽  
Q. Wang
Keyword(s):  
Gauge Invariance ◽  
Exclusive Processes

scholarly journals RESTRICTED LOCALITY OF QUARK-HADRON DUALITY IN EXCLUSIVE MESON PHOTOPRODUCTION REACTIONS ABOVE THE RESONANCE REGION

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1910-1913 ◽  
Author(s):  
QIANG ZHAO ◽  
FRANK E. CLOSE
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Scaling Laws ◽  
Resonance Region ◽  
Meson Photoproduction ◽  
Counting Rule ◽  
Dimensional Scaling ◽  
Exclusive Processes ◽  
Photoproduction Reactions ◽  
Hadron Duality

We show how deviations from the dimensional scaling laws for exclusive processes may be related to a breakdown in the locality of quark-hadron duality, i.e. the "restricted locality". For exclusive reactions like meson photo- and electroproduction above the resonance region, we explore the effects arising from such a local duality breaking and propose that it can be a possible source for oscillations about the smooth quark counting rule predicted by pQCD in the 90-degree differential cross sections.

scholarly journals Semi-exclusive processes: new probes of hadron structure

1999 ◽  
Vol 449 (3-4) ◽  
pp. 306-312 ◽  
Author(s):  
Stanley J. Brodsky ◽  
Markus Diehl ◽  
Paul Hoyer ◽  
Stéphane Peigné
Keyword(s):  
Hadron Structure ◽  
Exclusive Processes
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