منابع مشابه
Hard Processes on Nuclear Targets in Qcd
We calculate the A-dependence of open charm and beauty as well as DrellYan pair production cross sections on nuclear targets taking into account the difference of quark and gluon distributions in free and bound nucleons. The results are presented for both proton-nucleus and nucleus-nucleus collisions. For the case of heavy flavour production at comparatively low energies, if σ ∼ Aα, the values ...
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We consider the exclusive production of J/ψ mesons in polarized virtual-photon–proton collisions. We derive helicity amplitudes for the dominant subprocess γ * g → J/ψ g and show that polarization asymmetries vanish in the case of collinear scattering. Thus, contrary to what has been suggested earlier, this process is not a good probe of the polarized gluon distribution ∆g(x, Q 2) of the proton.
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It is a pleasure to present our results [1] here in Gatchina, where many of the fundamental ideas on the use of unitarity cutting rules perhaps originated [2]. Consider, for example, (not too) small-x deep inelastic scattering (DIS). On the free nucleon target, the qq̄ dipole will exchange a single gluon with the target and the recoiling nucleon debris will be in the color octet state. On a heav...
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Epilepsy is a neurological condition characterized by recurrent seizures influencing about 1% of the worldwide population. Despite much progress in understanding the pathogenesis of epilepsy, the molecular basis of human epilepsy still remains unclear. Common approaches for pharmacotherapy of epilepsy are still directed towards controlling the symptoms and suppression of seizures. Clinical use ...
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Unexpected drug toxicity is a critical problem for the pharmaceutical industry. Toxicity problems cause around 40% of drug candidates to be discontinued, oftentimes only after significant resources have been invested. Furthermore, drug-induced liver injury (DILI) is the most common reason already approved drugs are withdrawn from the marker, and causes half of all cases of acute liver failure, ...
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ژورنال
عنوان ژورنال: Tobacco Control
سال: 2001
ISSN: 0964-4563
DOI: 10.1136/tc.10.2.89