نتایج جستجو برای: first top
تعداد نتایج: 1541463 فیلتر نتایج به سال:
Single top quark production at hadron colliders allows a direct measurement of the top quark charged current coupling. We present the complete tree-level helicity amplitudes for four processes involving the production and semileptonic decay of a single top quark: W -gluon fusion, flavor excitation, s-channel production and W associated production. For the first three processes we study the qual...
We explore the potential for discovery of an exotic color sextet scalar in same-sign top quark pair production in early running at the LHC. We present the first phenomenological analysis at colliders of color sextet scalars with full top quark spin correlations included. We demonstrate that one can measure the scalar mass, the top quark polarization, and confirm the scalar resonance with 1 fb⁻...
abstract nowadays, the science of decision making has been paid to more attention due to the complexity of the problems of suppliers selection. as known, one of the efficient tools in economic and human resources development is the extension of communication networks in developing countries. so, the proper selection of suppliers of tc equipments is of concern very much. in this study, a ...
BACKGROUND The commonest reason for undertaking termination of pregnancy (TOP) in the UK is as defined by Clause 2 of the Abortion Act. There are no agreed criteria for defining 'recurrent abortion seekers'. We aimed to review the characteristics of women requesting termination of at least two consecutive pregnancies within 24 months of the first and to identify any factors for seeking repeat T...
Top is a most remarkable particle, even for a quark. A single top quark weighs 175 GeV/c 2 , about as much as an atom of gold. But unlike the gold atom, which can be disassembled into 79 protons, 79 electrons, and 118 neutrons, top seems indivisible, for we discern no structure at a resolution approaching 10 −18 m. Top's expected lifetime of about 0.4 yoctosecond (0.4× 10 −24 s) makes it by far...
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