10 research outputs found
The role of distal myocardial protection devices during percutaneous coronary interventions
Testes de laboratório em sementes de canola e a correlação com a emergência das plântulas em campo
Fundus changes in mesangiocapillary glomerulonephritis type II: clinical and fluorescein angiographic findings.
Microvascular Obstruction after Successful Fibrinolytic Therapy in Acute Myocardial Infarction. Comparison of Reteplase vs Reteplase+Abciximab: A Cardiovascular Magnetic Resonance Study
Study of hard scattering processes in multi - hadron production from gamma gamma collisions at LEP
The production of multihadronic states in γγ collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32pb−1, collected in the LEP runs of 1990–1992. Minimum bias data and a sample of events with jets at highp T have been selected under the requirement that no scattered electron or positron is observed. The two data sets have been compared to Monte Carlo predictions. The non-perturbative contribution described by the vector meson dominance Model and direct qqˉ production from pointlike photons described by the quark parton model were found to be insufficient to reproduce the data. It has been necessary to include a third interaction component, which is due to perburbative hard scattering of the partonic constituents of the photon. Several parametrisations of the quark and gluon densities of the photon have been tested. The interplay with the cut in jet transverse momentum, which is necessary for the separation of the perturbative and non-perturbative regions, is discussed. The data favour parametrisations with rather soft partonic content of the photon