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Showing 1 to 20 of 236 for “"gluon"”.
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Tracking the quark-gluon plasma
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Unintegrated Gluon Distributions at Small-x
… momentum of their parent hadrons. In this regime gluon occupation numbers are believed to be very high leading to saturation of the corresponding parton densities. This thesis is intended to explore the validity of factorization approaches in the small-x regime and establish a relation with …
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Gluon radiation beyond Poisson using MHV techniques
… the equivalent current for the case of multiple gluon emissions in vacuum. We then use the previous result to compute the two gluon correlation. We also study the radiation current induced from a change in the color state of an energetic quark: we start with the case of 1, 2, and 3 gluon induced …
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Strangeness production in a quark-gluon plasma
… We then derive the rate of plasmon decay (gluons pick up finite masses and widths due to interactions with the medium), which was proposed by Tanguy Altherr and David Seibert to be another important mechanism for the production of strangeness. In Chapter 4 we use Bjorken's framework of …
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Quark and gluon jet discrimination by neural networks
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:02Z Item is restricted indefinitely.
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Quark and gluon jet discrimination by neutral networks
… is on increasing the light quark jet signal to gluon jet background. We begin by demonstrating that there are characteristics common to quark jets and to gluon jets regardless of the interaction that produced them. The classification technique we use depends on the mass of the jet as well as …
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Towards the quark gluon plasma via MHV techniques
We study the multiple radiative gluon emission off a massless and highly energetic quark in the pQCD picture. We introduce the Maximally Helicity Violating (MHV) techniques to cope with the complexities in computing cross sections in multi-jet QCD. The multiphoton emission in QED is reviewed to …
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Bose-Einstein condensation from a gluon transport equation
… thesis we investigate the evolution of the quark gluon plasma, as produced in the early stages of a relativistic heavy ion collision, towards equilibrium. To this end we put forward a new numerical scheme to solve the QCD Boltzmann equation in the small-scattering angle approximation, which we …
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The gluon self-energy in cavity quantum chromodynamics
… It is shown for the case of the self-energy of a gluon in a cavity that no new divergences arise due to the presence of the boundary, provided that the regularization can be achieved in such a way that no subtractions are necessary. In order to avoid such subtractions, the so-called method of …
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Energy loss and theoretical uncertainties in small quark-gluon plasmas
There is a wealth of evidence that a Quark Gluon Plasma (QGP) is formed in heavy-ion collisions at RHIC and the LHC. Recently, there have been observations of QGP signatures in much smaller collision systems—including proton proton, and proton heavy-ion collisions—wherein QGP was not expected to …
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Two-gluon exchange graphs in cavity QCD to order αs2
… first order calculations and to evaluate the two-gluon exchange diagrams, which are second order in as. Two distinct Feynman diagrams exist, of which each consists of twenty-four timeordered diagrams. All the possible time-ordered diagrams are calculated here. A similar calculation of only the …
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Properties of quark gluon plasma at weak and strong coupling
… of probe particle traveling through quark gluon plasma as created in heavy ion collisions are investigated. In the first part, probability distribution P(k1 ) is calculated for an energetic parton that propagates for a distance L through a weakly coupled medium without radiating to pick up …
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Quark and Gluon Form Factors at Three Loops in Perturbative QCD
We compute the quark and gluon form factors at up to three-loop order within massless perturbative Quantum Chromodynamics by studying the photon-quark-anti-quark vertex and the effective vertex of a Higgs boson and two gluons. We use Feynman diagram methods to derive expressions for the …
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Quark and Gluon Propagation in Two-Colour Quantum Chromodynamics at Finite Density
… and chromomagnetic components of the gluon propagator have been calculated and their response to varying temperatures and chemical potentials are studied. The form factors of the normal and anomalous quark propagator are presented and their behaviour with respect to changing chemical …
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Exploring the quark-gluon content of hadrons: from mesons to nuclear matters
… properties of hadrons from the underlying quark-gluon degrees of freedom. Moreover, the problem of describing the nuclear force from its quark-gluon origin is still open. While a direct solution of QCD to describe the hadrons and nuclear force is not possible at this time, we explore a variety of …
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Short path length pQCD corrections to energy loss in the quark gluon plasma
Recent surprising discoveries of collective behaviour of low-pT particles in pA collisions at LHC hint at the creation of a hot, uid-like QGP medium. The seemingly conflicting measurements of non-zero particle correlations and RpA that appears to be consistent with unity demand a more careful …
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Towards a spacetime description of hard parton evolution in the quark gluon plasma
… created before the formation of the Quark Gluon Plasma. We propose this as a foundational model to use as an initial condition in jet energy loss calculations.
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