Theoretical interpretation and calculation of the European muon collaboration effect.
Item
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Title
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Theoretical interpretation and calculation of the European muon collaboration effect.
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Identifier
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AAI9130299
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identifier
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9130299
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Creator
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Cao, Nanwei.
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Contributor
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Adviser: Carl Shakin
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Date
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1991
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Nuclear
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Abstract
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First, we briefly review different models used in the description of deep inelastic scattering in nuclei (EMC effect). We discuss Fermi motion, nuclear binding, 'exess' pions in nuclei, Q{dollar}\sp2{dollar}-rescaling, etc. We present three novel calculations of the EMC effect which are of a 'microscopic' nature, in that the virtual photon is coupled to the quarks and quark wave functions are used. In our first analysis we investigated whether the EMC effect might be understood as having its origin in an off-mass-shell effect due to nuclear binding. Although we are able to fit the EMC data, we found that our results are very sensitive to the off-shell characterization of the struck quark. In our second calculation, we use the analytic parameterization of the structure function, F{dollar}\sb2{dollar}(x,Q{dollar}\sp2{dollar}), given by the EMC, in a convolution integral. In our discussion of Fermi motion and nuclear binding, we found that the results are not very satisfactory. We also considered the effect of 'swollen' nucleons in our analysis and found that our results improved somewhat. In our third approach to this problem, we considered the effect of final-state interactions (FSI). Instead of calculating FSI in detail, which is not really possible, we introduce a parameter {dollar}\delta{dollar} representing the momentum lost by the struck quark due to FSI. Combining this analysis with our calculation of the effects of Fermi motion and binding, we find that our results are much improved.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
