We discuss a pulsar acceleration mechanism based on asymmetric neutrino emission from the direct quark Urca process in the interior of proto neutron stars. The anisotropy is caused by a strong magnetic field which polarises the spin of the electrons opposite to the field direction. Due to parity violation the neutrinos and anti-neutrinos leave the star in one direction accelerating the pulsar. ...

The energy loss effect in nuclear matter is another nuclear effect apart from the nuclear effects on the parton distribution as in deep inelastic scattering process. The quark energy loss can be measured best by the nuclear dependence of the high energy nuclear Drell-Yan process. By means of two typical kinds of quark energy loss parametrization and the different sets of nuclear parton distribu...

We demonstrate that the global properties of the “rapidity gap” events, observed at HERA, can be understood based on electron-gluon scattering as the underlying partonic process. Using the measured inclusive structure function F2 to determine the parameters of the parton model, the diffractive structure function F 2 is predicted. The ratio of diffractive and inclusive cross sections, RD = σD/σi...

Orbital angular momentum is crucial for the description of several process at large momentum transfer in the impulse approximation in perturbative QCD. We review the mechanism of independent scattering which makes violation of the helicity conservation rule possible at leading order and without any need to flip a quark helicity in exclusive hadron-hadron reactions. We argue that helicity flip f...

It is shown that the proton " spin crisis " or " spin puzzle " can be understood by the relativistic effect of quark transversal motions due to the Melosh-Wigner rotation. The quark helicity ∆q measured in polarized deep inelastic scattering is actually the quark spin in the infinite momentum frame or in the light-cone formalism, and it is different from the quark spin in the nucleon rest frame...

The strikingly large spin-spin correlation ANN observed in pp elastic scattering at plab = 2.5 GeV/c and 11.75 GeV/ c and the unexpected energy dependence of absorptive corrections to quasi-elastic proton-proton scattering in a nuclear target can be interpreted in terms of two J = L = S = 1, B = 2 resonance structures associated with the strange and charmed particle production thresholds, inter...

In this HADRON2001 contribution we summarize the status of our quark-model calculations of hadron-hadron scattering amplitudes in annihilation-free channels. The predictions are in reasonably good agreement with experimentally known S-wave meson-meson and meson-baryon phase shifts, and there are very recent indications that S-wave πω scattering (extracted from FSIs in b1 decay) may also be simi...