Topic
Parton
About: Parton is a research topic. Over the lifetime, 13484 publications have been published within this topic receiving 368877 citations.
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TL;DR: In this article, the authors present a calculation of the next-to-leading-order QCD corrections, with the one-scale phase space slicing method, to single top quark production and decay process at hadron colliders.
Abstract: We present a calculation of the next-to-leading-order QCD corrections, with the one-scale phase space slicing method, to single top quark production and decay process $p\overline{p},pp\ensuremath{\rightarrow}t\overline{b}+X\ensuremath{\rightarrow}b\ensuremath{\ell}\ensuremath{
u}\overline{b}+X$ at hadron colliders. Using the helicity amplitude method, the angular correlation of the final state partons and the spin correlation of the top quark are preserved. The effect of the top quark width is also examined.
88 citations
CERN1
TL;DR: In this paper, it was shown that the limit of sums of very high order, unrenormalized planar Feynman diagrams lead to dual N point functions, and the parton mass turns out to be of the order of one GeV.
88 citations
TL;DR: In this article, the authors derived a quantum mechanical upper bound on the amount of radiative energy loss suffered by high energy quarks and gluons in nuclear matter and showed that the nuclear suppression observed in quarkonium production at high xF cannot be explained in terms of energy loss of the initial or final parton states.
88 citations
TL;DR: In this paper, a method to facilitate the consistent inclusion of cross-section measurements based on complex final states from HERA, TEVATRON and the LHC in proton parton density function (PDF) fits has been developed.
Abstract: A method to facilitate the consistent inclusion of cross-section measurements based on complex final-states from HERA, TEVATRON and the LHC in proton parton density function (PDF) fits has been developed. This can be used to increase the sensitivity of LHC data to deviations from Standard Model predictions. The method stores perturbative coefficients of NLO QCD calculations of final-state observables measured in hadron colliders in look-up tables. This allows the posteriori inclusion of parton density functions (PDFs), and of the strong coupling, as well as the a posteriori variation of the renormalisation and factorisation scales in cross-section calculations.
The main novelties in comparison to original work on the subject are the use of higher-order interpolation, which substantially improves the trade-off between accuracy and memory use, and a CPU and computer memory optimised way to construct and store the look-up table using modern software tools.
It is demonstrated that a sufficient accuracy on the cross-section calculation can be achieved with reasonably small look-up table size by using the examples of jet production and electro-weak boson (Z, W) production in proton-proton collisions at a center-of-mass energy of 14 TeV at the LHC.
The use of this technique in PDF fitting is demonstrated in a PDF-fit to HERA data and simulated LHC jet cross-sections as well as in a study of the jet cross-section uncertainties at various centre-of-mass energies.
88 citations
TL;DR: In this article, the Faddeev-Kulish approach of asymptotic dynamics is used to construct the QCD coherent states at the level of leading and first sub-leading infrared singularities.
88 citations