Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"impact parameter"”.
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Toward a Rigorous Justification of the Three-Body Impact Parameter Approximation
The impact parameter (IP) approximation is a semiclassical model in quantum scattering theory wherein N large masses interact with one small mass. We study this model in one spatial dimension using the tools of time-dependent scattering theory, considering a system of two large-mass particles and …
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The effect of δ [delta] rays on impact parameter resolution in pixel detectors
A review of the ALICE detector in the context of heavy ion collisions is given, along with a discussion on the use of Monte Carlo simulations in high energy physics. An investigation of the accuracy of GEANT3 simulation of low energy electrons is detailed.
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Pattern recognition analysis on heavy ion reaction data
… is to get information on the value of the impact parameter b. This work consists in the application of pattern recognition techniques aimed at associating values of b to groups of events. To this end, a support vec- tor machine (SVM) classifier is adopted to analyze multifragmentation …
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From Static Potentials to High-Energy Scattering
… with experimental data for cross sections, slope parameters, and structure functions. The obtained impact parameter profiles for proton-proton and longitudinal photon-proton reactions and the impact parameter dependent gluon distribution of the proton xG(x,Q^2,b) show saturation at ultra-high …
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Aspects of QCD at high energies and their Phenomenological Consequences
… a new model (3) that takes into account the impact parameter distributionof the initial state nuclear structure — the transverse projection of nuclear matter centered at thecollision point — in shaping the forward-forward dijet distribution in dilute-dense regimes. Dilutefast moving partons …
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Study of jet quenching using [gamma]-jet events in heavy ion collisions at 2.76TeV
… measured and their dependence on the collisional impact parameter is examined in lead-lead collision. The results of proton-proton collisions are used as the reference to which the lead-lead results are compared. Significant energy loss of jets induced by the hot and dense medium, and its gradual …
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Measurement of the CP Asymmetry in Semimuonic B Decays Produced in Proton-Antiproton Collisions at Center of Mass Energy= 1.96 TeV
… using a log likelihood fit to two-dimensional impact parameter significance templates. Corrections are made for asymmetries arising from the detector, trigger, and hadrons which are reconstructed as muons. Using 1.1 million muon pairs from data corresponding to an integrated luminosity of 1.6 …
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Theoretically Valid Aggregates in the Absence of Homothetic Preferences, Separable Utility, and Complete Price Data
… restrictions on the model that can significantly impact parameter and elasticity estimates. An alternative to imposing weak separability is to employ the Generalized Composite Commodity Theorem, which requires the relative intra-group commodity prices to be independent of the group price index. …
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Calculations on production reactions using the absorptive peripheral model
… method~ which is used here, and the earlier impact parameter formalism is given. The reaction K p -> K*N is treated in detail, as both pseudoscalar and vector meson exchanges appear to be important. The possibility of determining the signs of coupling constants from a study of these reactions …
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Machine Learning for Exotic Particle Detection in Ultraperipheral Relativistic Heavy-Ion Collisions
… collisions of relativistic nuclei in which the impact parameter is greater than the sum of the two radii; this leads to electromagnetic interactions rather than strong interactions. Standard searches for new or rare particles in ultraperipheral collisions rely on predefined decay topologies or …
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Angular Correlation of Emitted Neutrons Due to Giant Dipole Resonance in Ultra Peripheral Collisions
… are emitted independently but with a common impact parameter. This thesis attempts to measure the expected angular correlation of emitted neutrons from mutual GDR excitation in ultrarelativistic gold-gold collisions at the Relativistic Heavy Ion Collider (RHIC). The Sodnialdal Tracker At RHIC …
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Clustering phenomena from two-particle angular correlations in proton-proton and heavy ion collisions
… section (which is related to the ratio of the impact parameter to the nuclear radius, b/2R), suggesting a geometric origin. Further analysis for pairs from restricted azimuthal regions shows that the effective cluster size at [delta phi] ~ 180° drops more rapidly toward central collisions than …
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Korrelierte Elektron-Ion-Stöße in starken Laserfeldern
… be treated instantaneously, if the ratio of the impact parameter to the quiver amplitude is small. The energy distributions calculated in this approximation show an elastic peak and a broad plateau due to rescattered electrons. At incident velocities smaller than the quiver velocity, correlated …
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Measurement of non-flow correlations and elliptic flow fluctuations in Au+Au collisions at RHIC
… geometry of heavy ion collisions with finite impact parameter leads to an anisotropic particle production in the azimuthal direction through collective flow of the produced medium. In "head-on" collisions of Copper nuclei at ultrarelativistic energies, the magnitude of this "elliptic flow" has …
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Incoherent Photoproduction of $\phi$ Mesons in Ultra-Peripheral Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
… when the lead nuclei miss each other, having an impact parameter greater than twice the radius of the nucleus. The interaction, in this case, is electromagnetic. These electromagnetic interactions can be treated as the exchange of virtual photons. In a photonuclear interaction, the photon from …
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Non-adiabatic electron-ion dynamics in semiconductors under ionizing particle irradiation
… industry to medicine. However, as they impact materials, they inevitably cause damage, which fundamentally determines the materials' properties. Hence, the success of these applications relies on quantitative understanding of how energetic ions interact with target materials. Studying …
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Entwicklung von Objekt orientierten C++ Algorithmen zur b-Quark Identifikation
… the significance of the signed 3-dimensional impact parameter and used this to compute the track probabilities and the jet lifetime probability. The developed b-tag for ALEPH was put in perspective by comparison with the latest Rb measurements at the Z0 resonance: e.g. The newly implemented …
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Energy loss and equilibration of a highly energetic parton in QCD plasmas
… Second, the non-perturbative kernel being in impact parameter space is Fourier transformed back to momentum space. We then compute medium-induced radiation rates in infinite and finite medium lengths and compare with leading order and next-to-leading order kernels that are usually used in the …
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Numerical Modelling of the Dynamics and Gravitational Radiation of Compact Binaries in General Relativity
… collision of boson stars in 3D with non-zero impact parameter as an illustration of the methods. The previous innovations for the binary initial data, which significantly reduce spurious initial excitations of the scalar field profiles, as well as a measure for the angular momentum are used to …
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