The asymmetries between charm and anticharm mesons observed in fixedtarget photoproduction experiments are an order of magnitude larger than the asymmetries predicted by conventional perturbative QCD. We show that these charm meson asymmetries can be explained by a perturbative recombination mechanism for heavy meson production. In this process, a charm quark combines with a light antiquark fro...

Recently Plaga [1] claimed that the existence of a vector coupling of neutrinos in neutral currents, observed in the Charm II collaboration [2], led to the conclusion that neutrinos were Dirac particles. Although he successfully defended [1, 3] some of his assertions, his claim that Charm II data inevitably required Dirac neutrinos is not necessarily correct. Namely, Charm II data are fitted wi...

Intrinsic heavy quarks in hadrons emerge from the non-perturbative structure of a hadron bound state [1] and are a rigorous prediction of QCD [2, 3]. Lattice QCD calculations indicate significant intrinsic charm and strangeness probabilities [4, 5]. Since the light-front momentum distribution of the Fock states is maximal at equal rapidity, intrinsic heavy quarks carry significant fractions of ...

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...