Results 121 to 130 of about 166,360,743 (213)
Poincaré invariance in low-energy effective field theories for QCD
Journal of Physics: Conference Series, 2016 We present the calculations on deriving relations between the Wilson coefficients in non-relativistic quantum chromodynamics and potential non-relativistic quantum chromodynamics by exploiting the Poincare invariance. Implications of the constraints are briefly discussed in the context of the effective string theory.
openaire +1 more source
Large distance expansion in the Schrödinger representation of quantum field theory [PDF]
, 1997 This thesis is concerned with an approach to Quantum Field Theory in which the states are constructed from their large distance behaviour. The logarithm of the vacuum functional is expandable as a local quantity in any quantum field theory in which the ...
Sampaio, Marcos Donizeti Rodrigues +1 more
core
Renormalización de una Teoría Efectiva
Momento, 2008 The effective field theories are the best tool to describe that behavior at low energy of a theory known, for example the Quantum Chromodynamics (QCD), but the greater difficulty of these theories is its renormalization. It is necessary doing it order by
J. M. Cabarcas, J. Morales Aponte
doaj
On determining α s (m Z ) from dijets in e + e − thrust
Journal of High Energy PhysicsWe update a previous N3LL′+ O α s 3 $$ \mathcal{O}\left({\alpha}_s^3\right) $$ determination of the strong coupling from a global fit to thrust data by including newly available perturbative ingredients, upgrading the renormalization scales to include a ...
Miguel A. Benitez +4 more
doaj +1 more source
Effective field theory bootstrap, large-N χPT and holographic QCD
Journal of High Energy PhysicsA bstract We review the effective field theory (EFT) bootstrap by formulating it as an infinite-dimensional semidefinite program (SDP), built from the crossing symmetric sum rules and the S-matrix primal ansatz. We apply the program to study the large-
openaire +4 more sources
Heavy Quarkonium and QCD Non Relativistic Effective field Theories
, 2002 QCD nonrelativistic effective field theories (NREFT) are the modern and most suitable frame to describe heavy quarkonium properties. In this talk I summarize few relevant concepts and some interesting physical applications of NREFT.
openaire +2 more sources
Scalar mesons and tetraquarks by means of lattice QCD [PDF]
, 2012 We study the light scalar mesons a_0(980) and kappa using N_f = 2+1+1 flavor lattice QCD. In order to probe the internal structure of these scalar mesons, and in particular to identify, whether a sizeable tetraquark component is present, we use a large ...
Daldrop, Jan Oliver +7 more
core
A precise α s determination from the R-improved QCD static energy
Journal of High Energy PhysicsThe strong coupling α s is determined with high precision from fits to lattice QCD simulations on the static energy. Our theoretical setup relies on R-improving the three-loop fixed-order prediction for the static energy by removing its u = 1/2 ...
Jose M. Mena-Valle +2 more
doaj +1 more source
An effective field theory for thermal QCD with 2+1 flavours
We write a long-distance effective field theory (EFT) for QCD at finite temperature just below the crossover temperature $T_c$. The low energy constants (LECs) of this EFT are obtained from lattice measurements of the screening mass of pions at two temperatures for $N_f=2+1$ using lattice results obtained at physical values of pion and Kaon masses, and
Gupta, Sourendu +2 more
openaire +2 more sources
Transições de fase na matéria de quarks magnetizada com repulsão vetorial [PDF]
, 2015 Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Física, Florianópolis, 2015.Neste trabalho investigamos as transições de fase na matéria de quarks magnetizada usando o ...
Denke, Robson Zacarelli
core