نتایج جستجو برای: deep inelastic scattering
تعداد نتایج: 325219 فیلتر نتایج به سال:
The distribution of a suitably defined azimuthal angle in diffractive deep inelastic scattering contains information on the polarisation of the exchanged photon. In particular it allows one to constrain the longitudinal diffractive structure function. We investigate the potential of such bounds in general and for particular diffractive final states.
. With preliminary information from colliding beams relative to the coupling of photons with 7'high massn hadron states, we have extended the 1960 Drell model for photons interacting with nucleons, to estimate off the mass-shell photon cross sections. Based on kinematic considerations as to the domain in which the propagator of the virtual intermediate particle is large, one can predict cross s...
Jet cross sections in deep-inelastic scattering over a wide region of phase space have been measured at HERA. These cross section measurements provide a thorough test of the implementation of Quantum Chromodynamics in next-toleading order (NLO) calculations. They also provide the opportunity to test the consistency of the gluon distribution in the proton as extracted from (mainly) inclusive DIS...
Polarised quark distributions are extracted from semi-inclusive deep inelastic scattering data, which include the additional detection of a leading hadron to providestatisticaìàvour-tagging'. Results are combined from both proton and`neutron' targets to isolate the contributions to the nucleon spin of the individual quark avours, including the sea quarks. Spin asymmetries in the semi-inclusive ...
We perform an exploratory study of higher twist contributions to deep inelastic scattering. We estimate the size of two major sources of higher twist, namely absorptive corrections and the vector meson dominance (VMD) contribution. We find that they give a sizeable higher twist component of F2. For example at x = 0.01 it is about 8% (17%) at Q2 = 10 GeV2 (4 GeV2), reaching up to 27% at x = 10−4...
We present recent QCD results in ν−N scattering at the Fermilab CCFR/NuTeV experiments. We present the latest Next-to-Next-Leading order strong coupling constant, αs, extracted from Gross-Llewellyn-Smith sum rule. The value of αs from this measurement, at the mass of Z boson, is α s (M 2 Z ) = 0.114 −0.012 . We also present a preliminary result of the CCFR F2 at large-x. This measurement of F2 ...
The model–independent radiative corrections to deep–inelastic scattering of unpolarized electron beam off the tensor polarized deuteron target have been considered. The contribution to the radiative corrections due to the hard–photon emission from the elastic electron–deuteron scattering (the so–called elastic radiative tail) is also investigated. The calculation is based on the covariant param...
First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb. A signal for isolated photons in the transverse energy and rapidity ranges 5 < E T < 10GeV and −0.7 < η < 0.9 was observed for virtualities of the exchanged photon of Q > 3...
For the past 20 years the nuclear EMC effect — the nuclear medium modification of the nucleon structure functions — has posed a serious challenge to models of the nucleus which involve quark degrees of freedom. Although the basic features of the EMC effect can be understood within a conventional nuclear physics framework, a quantitative description over the entire range of Bjorken-x appears bey...
Jet production in neutral current (NC) deep inelastic ep scattering (DIS) has been studied by ZEUS and H1 using the full 1994-1997 ep datasets corresponding to 43 pband 37 pbrespectively . These luminosities and the high center of mass energy at HERA ( √ s = 300GeV) allow to investigate kinematic regions in the four momentum transfer Q and in jet transverse momenta E T not explored previously i...
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