Results 51 to 60 of about 12,651 (236)
QCD equation of state and dark matter
, 2012 The QCD equation of state is not often discussed in cosmology. However, the relic density of weakly interacting massive particles (WIMPs) depends on the entropy and the expansion rate of the Universe when they freeze out, at a temperature in the range ...
Philipsen, Owe +3 more
core +1 more source
Annalen der Physik, Volume 538, Issue 1, January 2026.The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley +1 more source
On-shelļ methods for perturbative QCD [PDF]
, 2006 We present new on-shell techniques for the calculation of colour ordered helicity amplitudes in QCD. We review the methods of on-shell recursion and the MHV rules before applying them to tree-level processes within the Standard Model.
Badger, Simon D., Badger, Simon D
core
Numerical studies of QCD renormalons in high-order perturbative expansions
, 2013 Perturbative expansions in four-dimensional non-Abelian gauge theories such as Quantum Chromodynamics (QCD) are expected to be divergent, at best asymptotic. One reason is that it is impossible to strictly exclude from the relevant Feynman diagrams those
Bauer, Clemens
core +1 more source
Results and techniques for higher order calculations within the gradient-flow formalism
Journal of High Energy Physics, 2019 We describe in detail the implementation of a systematic perturbative approach to observables in the QCD gradient-flow formalism. This includes a collection of all relevant Feynman rules of the five-dimensional field theory and the composite operators ...
Johannes Artz +4 more
doaj +1 more source
The Purely Leptonic and Semileptonic Decays of Ds∗ Meson
Advances in High Energy Physics, Volume 2026, Issue 1, 2026.With the potential prospects of the Ds∗ at high‐luminosity heavy‐flavor experiments in the future, we investigated the CKM‐favored and tree‐dominated leptonic Ds∗⟶ℓν¯ℓ,ℓ=e,μ,τ and semileptonic Ds∗⟶Mℓ′ν¯ℓ′ M=ϕ,η′,K and ℓ′=e,μ weak decays in the standard model (SM).
Xiao-Lin Wang +3 more
wiley +1 more source
Reggeon interactions in perturbative QCD [PDF]
Zeitschrift für Physik C Particles and Fields, 1995 13 pages LATEX, 2 figures using package FEYNMAN, N4 ...
openaire +2 more sources
ON PERTURBATIVE QCD OF HARD AND SOFT PROCESSES [PDF]
Modern Physics Letters A, 2009 We discuss some problems concerning the application of perturbative QCD to high energy processes. In particular for hard processes, we analyze higher order and higher twist corrections. It is argued that these effects are of great importance for understanding the behaviour of pion electromagnetic form factor at moderately large momentum transfers. For
Efremov, A. V., Radyushkin, A. V.
openaire +3 more sources
Non-leptonic B-decays in and beyond QCD factorisation [PDF]
, 2005 This thesis examines the non-leptonic B-decays within QCD factorization and beyond, to challenge the assumptions and limitations of the method. We analyse the treatment of the distribution amplitudes of light mesons and present a new model described by ...
Talbot, Angelique N. +1 more
core
Advances in High Energy Physics, Volume 2026, Issue 1, 2026.The effective string tension (κ) in the Schwinger mechanism and the effective temperature (T) in Bose–Einstein statistics are extracted from the transverse momentum (pT) spectra of heavy quarkonia produced in proton‐proton (p + p) collisions at the Large Hadron Collider (LHC).
Peng-Cheng Zhang +4 more
wiley +1 more source