The spin-dependent corrections to the static inter-quark potential are phenomenologically relevant to describing the fine and hyperfine spin splitting of the heavy quarkonium spectra. We investigate these corrections, which are represented as the field strength correlators on the quark-antiquark source, in SU(3) lattice gauge theory. We use the Polyakov loop correlation function as the quark-an...

We compare vector boson fusion and quark antiquark annihilation production of vector boson pairs at the LHC and include the effects of anomalous couplings. Results are given for confidence intervals for anomalous couplings at the LHC assuming that measurements will be in agreement with the standard model. We consider all couplings of the general triple vector boson vertex and their correlations...

Quark spin and orbital angular momentum in the nucleon are calculated in symmetry-breaking chiral quark model. The results are compared with data and other models. Synopsis: Recent measurements show (1) strong flavor asymmetry of the antiquark sea 1 : ¯ d > ¯ u, (2) nonzero strange quark content 2 : < ¯ ss > = 0, (3) sum of quark spins is small 3 : < s z > q+¯ q = 0.1 − 0.2, and (4) antiquark s...

We present a method for computing the static quark-antiquark potential, which is not based on Wilson loops, but where the trial states are formed by eigenvector components of the covariant lattice Laplace operator. We have tested this method in SU(2) Yang-Mills theory and have obtained results with statistical errors of similar magnitude compared to a standard Wilson loop computation. The runti...

We calculate the cross section for the production of two jets with large transverse momenta k in DIS diffractive dissociation for both transverse and longitudinally polarized photons. The scale which defines the hardness of the Pomeron is found to be k Q 2 +M M . We present analytic expressions and discuss numerical results relevant for the diffractive dissociation at HERA. 1.) The diffractive ...

Tremendous progress has been made experimentally in the hadron spectrum containing heavy quarks last two decades. It is surprising that many resonant structures are around thresholds of a pair hadrons. There should be threshold cusp at any $S$-wave threshold. By constructing nonrelativistic effective field theory with open channels, we discuss generalities behavior, and offer an explanation abu...

Leading terms of the static quark-antiquark potential in the background perturbation theory are reviewed, including perturbative, nonperturbative and interference ones. The potential is shown to describe lattice data at short quark-antiquark separations with a good accuracy. 1. The static quark-antiquark potential was calculated with high accuracy in lattice QCD some years ago [1]. It was shown...

According to quantum chromodynamics, vacuum is not an empty space, because it filled with quark–antiquark pairs. The pair has the same numbers as and forms a condensate strong interaction of chromodynamics too leave empty. This condensation, chiral condensate, breaks symmetry vacuum. expectation value order parameter symmetry, which expected decrease at high temperatures or matter densities whe...

We report on investigations concerning the production of large transverse momentum jets in DIS diffractive dissociation. These processes constitute a new class of events that allow for a clean test of perturbative QCD and of the hard (perturbative) pomeron picture. The measurement of the corresponding cross sections might possibly serve to determine the gluon density of the proton.

We present a number of jet fragmentation measurements in ee ! hadrons. The ALEPH collaboration measures inclusive (770), f0(980) and f2(1270) production rates, improving the world averages. The SLD collaboration measures , K and p/ p production in light-, cand bavor Z decays, as well as leading hadrons in light-quark jets, precisely. The DELPHI collaboration measures the average charged multipl...