Contributions to the quark flavor and spin observables from the intrinsic charm in the proton are discussed in the SU(4) quark meson fluctuation model. Our results suggest that the probability of finding the intrinsic charm in the proton is less than 1%. The intrinsic charm helicity is small and negative, ∆c ≃ −(0.003 ∼ 0.015). The fraction of the total quark helicity carried by the intrinsic c...

Since a few years, charm and charmonium spectroscopy has revived, both from experimental and theoritical point of views. Many new states have been discovered triggering numerous theoritical publications. The B-factories with their large enriched charm sample have played a leading role on the experimental side with the observation and study of most of the new states. Other experiments such as CL...

We argue that a large fraction of the proton spin comes from a contribution due to a nonperturbative intrinsic charm component of the proton. An account of this contribution removes an apparent contradiction between the data and exact Kühn-Zakharov low energy theorem. On the other hand, we show that a large intrinsic charm spin component of the proton is implied by recent CLEO data on B → η dec...

Borrowing the structures of hydrogen atom, molecular ion, and diatomic molecule, we predict nature a new type hydrogenlike charm-pion or charm-kaon matter that could be obtained by replacing proton electron in with charmed meson pion kaon, respectively. We find spectra molecule can simultaneously Coulomb potential for hydrogen, charm-pion, systems. The predicted also allows us to explore mass s...

M e t h o d s Design: Prespecified secondary analysis of 3 randomized, placebo-controlled trials (Candesartan in Heart Failure: Assessment of Reduction in Mortality and Morbidity Program [CHARM]). Allocation: {Concealed}†.* Blinding: Blinded {clinicians, patients, data collectors, outcome assessors, monitoring committee, manuscript writers, and data analysts}†.* Follow-up period: Median 3.1 yea...

Based on a perturbative theory of quantum chromodynamics and non-relativistic quark model, associated J/ψ plus open charm photoproduction on charm quarks in a proton via partonic subprocess γc→ J/ψc is discussed. It is shown that the value and energy dependence of the cross section for such process remarkably depends on the choice of charm distribution function in a proton. In the region of sma...

In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...

The systematic investigations of the role of the virtual charm axial currents in the decay of B-mesons to η ′ K and the spin structure of the nucleon are performed. We reduce the divergence of the virtual charm axial current to a specific gluon operator. Since this operator receives the main contribution from topologically nontrivial components of the QCD vacuum, we rederive the Diakonov-Petrov...

We outline the existing descriptions of the charm component of the deep inelastic proton structure function F2. We discuss recent approaches to include charm mass effects in the parton evolution equations and the coefficient functions. Contribution to the Proceedings of the Madrid low x Workshop, June 18-21 1997, Miraflores, Spain Both H1 and ZEUS have used c → D to measure charm production in ...