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AbstractAbstract
[en] The resummation of double-logarithmic perturbative contributions produced by soft-gluon radiation (Sudakov resummation) has proved to be an important tool for enlarging the applications of perturbative QCD to a wider range of kinematical regions. In particular, a complete description of W and Z boson production at high-energy hadron colliders requires the resummation of large double logarithms that dominate the transverse momentum (pT) distribution at small pT. This can be performed either directly in transverse momentum space or in impact parameter (Fourier transform) b space. The b space method succeeds in resumming all the leading and sub-leading logarithmic terms, but does not allow a smooth transition to fixed-order dominance at high transverse momenta. In contrast, the pT space approach experiences difficulties with resumming more sub-leading logarithms. This thesis concentrates on developing the pT space formalism which completely resums the first four towers of logarithms. The number of fully resummed towers is the same as for the b space method. The results are compared, both analytically and numerically, with the original b space result as well as with results of other pT space methods. Parametrization of the non-perturbative effects in pT space is, discussed. Given recent Tevatron data on Z boson production we find good agreement between the data and the theoretical predictions. Using the same formalism, the transverse momentum distributions are also calculated for W and Z boson production at the LHC. Finally, we discuss production of like-sign W pair production in the context of double parton scattering at the LHC. (author)
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Sep 2000; [vp.]; Available from British Library Document Supply Centre- DSC:DXN039275; Thesis (Ph.D.)
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Miscellaneous
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Thesis/Dissertation
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