Results 81 to 90 of about 166,360,743 (213)

Tetraquarks in the Born-Oppenheimer approximation

Journal of High Energy Physics
The conventional loosely bound molecule interpretation of the X(3872) is not compatible with the recent LHCb experimental measurement of the ratio of branching fractions R $$ \mathcal{R} $$ = Br(X → ψ′γ)/Br(X → ψγ). We systematically determine the entire
D. Germani, B. Grinstein, A. D. Polosa
doaj   +1 more source

A Superalgebra Within: Representations of Lightest Standard Model Particles Form a Z25$\mathbb {Z}_2^5$‐Graded Algebra

Annalen der Physik, Volume 537, Issue 12, December 2025.
 A set of particle representations, familiar from the Standard Model, collectively form a superalgebra. Those representations mirroring the behaviour of the Standard Model's gauge bosons, and three generations of fermions, are each included in this algebra, with exception only to those representations involving the top quark.
N. Furey
wiley   +1 more source

The anomalous chiral Lagrangian at order p 8

Journal of High Energy Physics
We derive the order p 8 Lagrangian of odd intrinsic parity for mesonic chiral perturbation theory, and provide the resulting operator basis in the supplementary material.
Johan Bijnens, Nils Hermansson-Truedsson, Joan Ruiz-Vidal   +2 more
doaj   +1 more source

Topics in Lattice QCD and Effective Field Theory

, 2010
Effective field theories provide a formalism for categorizing low-energy effects of a high-energy fundamental theory in terms of the low-energy degrees of freedom. This process has been well established in mapping the fundamental theory of QCD in terms of the hadronic degrees of freedom, which allows for quantitative connections and predictions between
openaire   +2 more sources

LARGE COMPONENT QCD AND THEORETICAL FRAMEWORK OF HEAVY QUARK EFFECTIVE FIELD THEORY [PDF]

International Journal of Modern Physics A, 2006
Based on a large component QCD derived directly from full QCD by integrating over the small components of quark fields with |p| < E + mQ, an alternative quantization procedure is adopted to establish a basic theoretical framework of heavy quark effective field theory (HQEFT) in the sense of effective quantum field theory.
openaire   +2 more sources

Lattice QCD at finite density [PDF]

, 1987
Karsch F. Lattice QCD at finite density. Nuclear Physics, A. 1987;461(1-2):305-316.We discuss the behavior of the zero temperature limit of lattice field theories with finite chemical potential.
Karsch, Frithjof
core   +1 more source

Improved π 0 , η, η′ transition form factors in resonance chiral theory and their a μ HLbL $$ {a}_{\mu}^{\textrm{HLbL}} $$ contribution

Journal of High Energy Physics
Working with Resonance Chiral Theory, within the two resonance multiplets saturation scheme, we satisfy leading (and some subleading) chiral and asymptotic QCD constraints and accurately fit simultaneously the π 0 , η, η′ transition form factors, for ...
Emilio J. Estrada, Sergi Gonzàlez-Solís, Adolfo Guevara, Pablo Roig   +3 more
doaj   +1 more source

Effective field theories in QCD

, 2002
These are the proceedings of the workshop on ``Effective Field Theories of QCD'' held at the Physikzentrum Bad Honnef of the Deutsche Physikalische Gesellschaft, Bad Honnef, Germany from November 26 to 30, 2001.
Meissner, Ulf-G., Bijnens, Johan, Wirzba, Andreas   +2 more
core  

NRQCD, Effective Field Theories and Potential Models [PDF]

, 2000
We review some recent developments on non-relativistic effective field theories for heavy quark-antiquark systems and how they can bring a well founded connection between QCD and potential models.We review some recent developments on non-relativistic ...
Pineda, Antonio, Antonio Pineda
core   +1 more source

Producing fully-charmed tetraquarks via charm quark fragmentation in colliders

Journal of High Energy Physics
Within the framework of nonrelativistic QCD (NRQCD), we calculate the fragmentation function for a charm quark into an S-wave fully-charmed tetraquark, denoted as T 4c .
Xiao-Wei Bai, Feng Feng, Chang-Man Gan, Yingsheng Huang, Wen-Long Sang, Hong-Fei Zhang   +5 more
doaj   +1 more source