نتایج جستجو برای: معیار who
تعداد نتایج: 819767 فیلتر نتایج به سال:
We report on new results of the spin dependent structure functions g 1 and h 1 of the nucleon. An attempt is made to convert the moments, which is what one computes on the lattice, to quark distribution functions.
A new classification approach was developed to improve the noninvasive diagnosis of brain tumors. Within this approach, information is extracted from magnetic resonance imaging and spectroscopy data, from which the relative location and distribution of selected tumor classes in feature space can be calculated. This relative location and distribution is used to select the best information extrac...
Top quark production at the Fermilab Tevatron probes very high mass scales, O(500 GeV ), and therefore is sensitive to new physics at this scale. Hence, it is important that we studied this process with high precision and compare the results with the standard model predictions. Also the top quark mass along with the W-boson mass can be used as an indirect measurement of the Higgs boson mass or ...
We study soft-gluon radiation for heavy quark production in charged-current Deep Inelastic Scattering processes. We resum large-x contributions to the MS coefficient function to next-to-leading logarithmic accuracy and present results for charm quark structure functions for several values of the ratio mc/Q. The effect of soft resummation turns out to be visible, especially at small Q, and the r...
We make a quenched lattice simulation of hadron spectroscopy at β = 6.2 with the Wilson action non-perturbatively improved. With respect to the unimproved case, the estimate of the lattice spacing is less influenced by the choice of input hadron masses. We study also the effects of using an improved quark mass in the fits to the dependence of hadron masses upon quark masses. CERN-TH/97-321 Nove...
Microarray technology allows the simultaneous analysis of up to thousands of different genes in histological or cytological specimens. Although microarray technology has so far mainly been applied in the research setting, its clinical application in pathology is expected in the foreseeable future. This paper presents an overview of the technical "ins and outs" of microarray technology, and disc...
I discuss mechanisms of heavy quark production in (real) photon-nucleon and (real) photon (real) photon collisions. In particular, I focuse on application of the Saturation Model. In addition to the main dipole-nucleon or dipole-dipole contribution included in recent analyses, I propose how to calculate within the same formalism the hadronic single-resolved contribution to heavy quark productio...
We discuss the determination of polarized parton distributions from a NLO analysis of recent experimental data. We extract the first moment of the polarized quark and gluon distribution and assess the corresponding uncertainties, with special regard to those related to scheme dependence. Talk given at DIS96, Rome, April 1996 to be published in the proceedings
Two broad charmed mesons, the D∗ 0 and D ′ 1, have recently been observed. We examine the quark model predictions for the D∗ 0 and D ′ 1 properties and discuss experimental measurements that can shed light on them. We find that these states are well described as the broad, j = 1/2 non-strange charmed P -wave mesons. Understanding the D∗ 0 and D ′ 1 states can provide important insights into the...
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