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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: The parton distribution functions (PDFs) of the proton, a necessary input to almost all theory predictions for hadron colliders, are reviewed in this article, with an introduction to the PDF determination by global analyses of the main PDF fitting groups with an emphasis on HERA PDFs.
Abstract: The parton distribution functions (PDFs) of the proton, a necessary input to almost all theory predictions for hadron colliders, are reviewed in this document. An introduction to the PDF determination by global analyses of the main PDF fitting groups with an emphasis on HERA PDFs is presented. Finally, theory predictions based on different PDFs are compared to some recent relevant LHC and Tevatron measurements.
110 citations
TL;DR: In this article, a GPU parallelized (3 + 1 )D hydrodynamics that has a source term from the energy-momentum deposition by propagating jet shower partons and provides real time update of the bulk medium evolution for subsequent jet transport is developed for co-current and event-by-event simulations of jet transport and jet-induced medium excitation.
110 citations
TL;DR: In this paper, the authors studied the production and decay dynamics for processes containing a very heavy quark Q of a new flavor, decaying via weak interactions, and showed that the event-by-event distribution of hadrons is similar to what would exist in a similar direct process involving the same produced partons (with the same momenta), but not involving a cascade decay.
Abstract: We study, in the framework of the naive quark-parton model, production and decay dynamics for processes containing a very heavy quark Q of a new flavor, decaying via weak interactions. We argue the following. (i) The event-by-event distribution of hadrons is similar to what would exist in a similar direct process involving the same produced partons (with the same momenta), but not involving a cascade decay. (ii) For neutrino production, electroproduction, and e/sup +/e/sup -/ annihilation, at energies far above threshold, the inclusive momentum distribution of a stable hadron H containing the Q peaks near the maximum momentum, i.e., at values of the scaling variable z approx. 1. (iii) For events containing a nonleptonic decay of Q into ordinary quarks via Q ..-->.. qq-barq, the leading hadron distribution is characterized by multiplicity approx.3 times normal multiplicity, as well as abnormally large transverse momenta.
109 citations
TL;DR: In this article, a new approach to combine multiple NLO parton-level calculations matched to parton showers into a single inclusive event sample is presented, which provides a description of hard multi-jet configurations at next-to-leading order in the perturbative expansion of QCD, and is supplemented with the all-orders resummed modelling of jet fragmentation provided by the parton shower.
Abstract: We present a new approach to combine multiple NLO parton-level calculations matched to parton showers into a single inclusive event sample. The method provides a description of hard multi-jet configurations at next-to leading order in the perturbative expansion of QCD, and it is supplemented with the all-orders resummed modelling of jet fragmentation provided by the parton shower. The formal accuracy of this technique is discussed in detail, invoking the example of electron-positron annihilation into hadrons. We focus on the effect of renormalisation scale variations in particular. Comparison with experimental data from LEP underlines that this novel formalism describes data with a theoretical accuracy that has hitherto not been achieved in standard Monte Carlo event generators.
109 citations
TL;DR: In this paper, the authors present two independent procedures through which background subtraction can be performed and discuss the impact of the medium recoil on jet shape observables, which significantly improves the JEWEL description of jet shape measurements.
Abstract: Realistic modeling of medium-jet interactions in heavy ion collisions is becoming increasingly important to successfully predict jet structure and shape observables. In JEWEL, all partons belonging to the parton showers initiated by hard scattered partons undergo collisions with thermal partons from the medium, leading to both elastic and radiative energy loss. The recoiling medium partons carry away energy and momentum from the jet. Since the thermal component of these recoils' momenta is part of the soft background activity, comparison with data requires the implementation of a subtraction procedure. We present two independent procedures through which background subtraction can be performed and discuss the impact of the medium recoil on jet shape observables. Keeping track of the medium response significantly improves the JEWEL description of jet shape measurements.
109 citations