16796042
Quark Confinement in Light-Front QCD and A Weak-Coupling Treatment to Heavy Hadrons
In this paper, we develop a weak-coupling treatment of nonperturbative QCD to heavy hadrons on the light-front. First, we present a derivation of quark confining interaction in light-front QCD for heavy quark systems, based on the recently developed light-front similarity renormalization group approach and the light-front heavy quark effective theory. The resulting effective lightfront QCD Hamiltonian Hλ at a low-energy cutoff λ manifests the coexistence of a confining potential and a Coulomb potential. A clear light-front picture of quark confinement emerges. Using this low energy QCD Hamiltonian Hλ, we study heavy hadron bound state equations in the framework of a recently proposed possible weak-coupling treatment of non-perturbative QCD. Lightfront heavy hadron bound states with definite spin and parity are constructed and the general structure of the corresponding wavefunctions is explored. A Gaussian-type wavefunction ansatz is used to solve the light-front quarkonium
120753030
Coherent states: Theory and some Applications
In this review, a general algorithm for constructing coherent states of dynamical groups for a given quantum physical system is presented. The result is that, for a given dynamical group, the coherent states are isomorphic to a coset space of group geometrical space. Thus the topological and algebraic structure of the coherent states as well as the associated dynamical system can be extensively discussed. In addition, a quantum-mechanical phase-space representation is constructed via the coherent-state theory. Several useful methods for employing the coherent states to study the physical phenomena of quantum-dynamic systems, such as the path integral, variational principle, classical limit, and thermodynamic limit of quantum mechanics, are described.
35314072
Geometrical structure and critical phenomena in the fermion dynamical symmetry model: Sp(6).
296941
Influence of Dynamical Pauli Effect and Dynamical Symmetry Breaking to Quantum Chaos
In this paper, we study the influence of quantum effects to chaotic dynamics, especially the influence of Pauli effect and dynamical symmetry breaking to chaotic motions. We apply the semiquantal theory to the Sp(6) fermion symmetry model in nuclear collective motion. We demonstrate that quantum chaos appears when dynamical symmetry is broken. We further show that dynamical Pauli effect enhances quantum chaos.
41901069
Geometrical interpretation of SO(7): A critical dynamical symmetry.
Potential-energy surfaces are obtained for the three dynamical-symmetry chains of SO(8) within the fermion-dynamical-symmetry model. A remarkable feature is that the SO(7) dynamical symmetry is transitional and ..beta.. soft. The transitional or ''critical'' behavior of SO(7) is vividly demonstrated.
119531804
Light front dynamics and light front QCD
In this article we review the basic formulation of light-front field theory and light-front phenomena in strong interaction. We also explore various approaches to the understanding of these phenomena and the associated problems of hadronic bound states based on QCD (quantum chromodynamics) on the light-front.
123077981
Electroweak measurements in the forward region at the LHCb
LHCb [1] is a single arm forward spectrometer specially designed to study b-physics. It covers the pseudo-rapidity, η, in the range of 2.0 < η < 5.0. Of this, 2.0 < η < 2.5 is common to ATLAS and CMS while 2.5 < η < 5.0 is unique to LHCb. Thus, LHCb provides complementary measurements of electroweak physics to those performed by ATLAS and CMS. Here, we report on the cross section results for W , Z and low mass Drell–Yan production in the LHCb with approximately 37 pb−1 of data recorded in 2010 and 1 fb−1 of data recorded in 2011 at √ s = 7 TeV. W , Z and low mass Drell–Yan production cross section measurements provide an important test of the Standard Model. The uncertainty on NNLO predictions is dominated by PDF uncertainties. The PDF uncertainties change with boson rapidity [2]. In the kinematic region, where the uncertainty is low, electroweak measurements can test the Standard Model to a precision of 1%. In the kinematic region, where the uncertainty is high, a precise electroweak measurement in LHCb can be used to constrain PDFs.