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Showing 1 to 20 of 23 for “"Resummation"”.
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Resummation in Deep Inelastic Scattering
… techniques are needed to compute cross sections. Resummation is the process in which the perturbative series in the cross section is reordered and then resummed to give a prediction that includes nonperturbative QCD effects. In this paper we merge the resummed series into a redefinition of the …
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HIGH ENERGY RESUMMATION IN PERTURBATIVE QCD
… we review the general aspects of the high energy resummation technique. Recently derived results for high energy resummation of direct photon production are matched to NLO computations, and their implications at the Tevatron and at the LHC are explored. The effects of resummation are compared to …
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Aspects of Non-Perturbative Renormalization
… theory. The Wegner-Houghton equation provides a resummation of the loop-expansion, and the Polchinski equation is based on the resummation of the perturbation series. Therefore, these equations are exact in the sense that they contain all quantum corrections. In the framework of these …
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Measurement of Z Boson Transverse Momentum In Proton-Antiproton Collisions At sqrt(s)=1.96 TeV
… is done using traditional Collins-Soper-Sterman resummation than when using a recent resummed form factor with modifications in the small-x region.
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The Development of Computational Tools for Theoretical Predictions in Particle Physics at the Large Hadron Collider
… calculations associated with transverse momentum resummation for a wide range of LHC processes. Details of the methods, assumptions, validation and results for channels so far included are all provided, these show excellent agreement with previous theoretical results and experimental data. Both …
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Accuracy and precision in collider event shapes
… the Soft-Collinear Eective Theory (SCET) with a resummation to N³LL' accuracy of the most singular partonic terms. Our result holds for C in the peak, tail, and far-tail regions. We treat hadronization effects using a field theoretic nonperturbative soft function, with moments [omega]n, and …
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The Runny Gauge Plasma: shear viscosity to entropy for quarks and gluons
… both the thermal and vacuum fluctuations in resummation-improved perturbation theory. In this respect, we thoroughly analyse the range of applicability for perturbative approximations in which the coupling may be 'moderately' large.η
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W-pair production near threshold in unstable particle effective theory
… order Standard Model diagrams. The effect of resummation of logarithmically enhanced terms is also investigated, but found to be negligible.
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Optimierte Borelsummation von kritischen Exponenten und universellen Amplitudenverhältnissen im phi 4-Modell
… stems from an enhancement of the method of resummation. Amplitude functions at the fixpoint are resummed. Analytical results for certain universal amplitude ratios are achieved. So far only numerical or experimental quantitative results for these ratios are known.
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On Different Parametrizations of Feynman Integrals
… at the Large Hadron Collider. We use the resummation of soft gluon emission corrections to study the associated production of a top pair and a Z boson to next-to-next-to-leading logarithmic accuracy, and compute the total cross section and differential distributions for a range of …
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Third-order QCD corrections to heavy quark pair production near threshold
… results obtained could be used for a third order resummation of large logarithms. Further applications are also the extraction of the bottom quark mass with sum rules.
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Perturbative and non perturbative effects in the Standard Model and orbifolded ADS/CFT based theories
… effects, we consider the leading logarithmic resummation in small Bjorken x QCD, concentrating ourselves on the Nc dependence of the Green functions associated to reggeized gluons. Here the eigenvalues of the BKP kernel for states of more than three reggeized gluons are unknown in general, …
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Strangeness production in a quark-gluon plasma
… into consideration through Braaten-Pisarski resummation. In Chapter 3 we use the Cutkosky rules to calculate the standard QCD quark production mechanisms. The intention is to eventually generalise these calculations to finite temperature. We then derive the rate of plasmon decay (gluons pick …
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Phenomenological aspects of new physics at high energy hadron colliders
… in the HERWIG++ event generator. By applying resummation techniques, we provide, in chapter 4, analytical calcula- tions of two types of hadron collider observables. The first, global inclusive variables, are observables that make use of all measured particle momenta and can provide useful …
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Precision determination of the strong coupling constant
… which smoothly interpolate between regions where resummation of large logarithms is important and where it is not. To determine non perturbative effects, we fit renormalon-free nonperturbative matrix elements of operators defined in field theory, Q1. We perform a global analysis to all available …
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Jet production at hadron colliders
… hard, jet, beam, and soft functions enables such resummation. We begin by studying jet production at e + e- collisions in order to focus on the effects of jet algorithms. These results can be carried over to the more complicated case of hadron collisions. We use the Sterman-Weinberg algorithm as a …
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Thermal QCD on the lattice – from finite density to non-uniform magnetic fields
… a new approximation technique -- based on a resummation of $B$-dependent expectation values into so-called sea and valence contributions -- to extract information about the medium properties, such as the magnetic susceptibility, at a lower computational cost. Our continuum-extrapolated …
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A Charcuterie Platter of QCD Matter
… Model, using tools such as factorization and resummation from EFT. Last but not least, the final question explores the underlying symmetry properties of QCD and its potential completions: How robust is the axion solution to the strong CP (ChargeParity) problem, and what are some of its …
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TOWARDS A GENERALIZATION OF THE NESTED SOFT-COLLINEAR SUBTRACTION SCHEME FOR NNLO INFRA-RED DIVERGENCES IN QCD
… data, including parton distribution functions, resummation, parton showers, hadronization modeling, and fixed-order calculations. In fixed-order calculations, one of the major challenges consists of constructing infra-red (IR) regularization schemes: this thesis focuses on the latter area. It is …
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Analytic Modelling of Gravitational-Wave Source in General Relativity and Alternative Theories of Gravity
… relativity (NR) for merger and ringdown, or resummation methods such as the effective-one-body (EOB) formalism to describe the complete dynamics. In this thesis, we discuss the construction of analytical waveform models within the EOB formalism for a specific alternative theory of gravity the …
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