Distortions in the negative energy Dirac sea: violation of the Gottfried sum rule and ∆¯ u in proton We report on recent work concerning the effect which the change in vacuum structure (negative energy Dirac sea), in the presence of a confining scalar field, has on the nucleon structure functions and parton distributions. Using the Dirac equation in 1+1 dimensions, we show that distortions in t...

In this paper, I intend to present a series of observations concerning the relationship between the Bodhisattvapiṭaka and Akṣayamatinirdeśa. Analysis of these sūtras has shown that the Akṣayamatinirdeśa is greatly indebted to the Bodhisattvapiṭaka for its material, often to the extent of reproducing entire passages from the Bodhisattvapiṭaka verbatim. Presumably in response to changes in curren...

A novel nuclear effect on the flavour asymmetry of anti-quarks in the nucleon bound in a nucleus is discussed in terms of the meson cloud model and the Pauli exclusion principle. It is expected that the flavour asymmetry is enhanced in a nucleus. PACS. 13.60.Hb Nuclear structure functions (flavour asymmetry) – 21.90.+f Mesons in nuclei It is a rather surprising that the distribution of ū is dif...

We give a brief summary of the Gottfried sum rule and a flavor asymmetric distribution ¯ u− ¯ d in the nucleon. First, experimental history of the sum-rule studies is discussed. Second, future prospects for studying the asymmetry at Fermilab and RHIC are discussed. We also comment on possible nuclear modification.

The Pauli exclusion principle is advocated for constructing the proton and neutron deep inelastic structure functions in terms of Fermi-Dirac distributions that we parametrize with very few parameters. It allows a fair description of the recent NMC data on F p 2 (x, Q ) and F n 2 (x, Q ) at Q = 4GeV , as well as the CCFR neutrino data at Q = 3 and 5GeV . We also make some reasonable and simple ...

We have performed the first comprehensive global QCD analysis including the CCFR and NuTeV di-muon data; this data provides strong constraints on the strange quark PDF. Introduction The recent measurements of both neutrino and anti-neutrino production of charm (as di-muon final states) by the CCFR and NuTeV collaborations provide important new information on the strange quark distribution, s(x)...

Longitudinally polarized, unpolarized and forward-backward mass differential cross sections for Drell-Yan lepton-pair production by arbitrary vector bosons are calculated in next-to-leading order (NLO) QCD. Analytical results are presented in a form valid for all consistent n-dimensional regularization schemes, with the mass factorization scheme kept general. NLO predictions for all Drell-Yan t...

We investigate the mass spectrum of pentaquark baryons in quenched lattice QCD with exact chiral symmetry. Using interpolating operators based on the diquark-diquark-antiquark picture in the Jaffe-Wilzcek model, we measure time correlation functions for 70 gauge configurations generated with Wilson gauge action at β = 6.1 on the 203 × 40 lattice, and extract the masses of even and odd parity st...