• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 255
  • 82
  • 44
  • 18
  • 17
  • 15
  • 9
  • 8
  • 6
  • 6
  • 6
  • 6
  • 6
  • 6
  • 2
  • Tagged with
  • 500
  • 221
  • 175
  • 140
  • 137
  • 126
  • 116
  • 94
  • 85
  • 79
  • 75
  • 74
  • 69
  • 68
  • 64
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
151

Measurement of the strangeness spectral function and the mass of the strange quark in hadronic t decays with the opal detector

Mader, Wolfgang Franz. Unknown Date (has links) (PDF)
University, Diss., 2004--Bonn.
152

Paarproduktion schwerer Quarks in e+e--Kollisionen: QCD-Strahlungskorrekturen für die Quark-Antiquark-Beiträge zur Ordnung a2S

Leineweber, Thilo. Unknown Date (has links) (PDF)
Techn. Hochsch., Diss., 2005--Aachen.
153

Scale dependence of mean transverse momentum fluctuations at top sps energy measured by the CERES experiment and studies of gas properties for the ALICE experiment

Tsiledakis, Georgios Karolos. Unknown Date (has links)
Techn. University, Diss., 2006--Darmstadt.
154

Modelling ultra-relativistic heavy ion collisions with the quark molecular dynamics qMD

Scherer, Stefan. Unknown Date (has links)
University, Diss., 2006--Frankfurt (Main). / Zsfassung in engl. und dt. Sprache.
155

Lebensmittelqualität zwischen Geschmack und Zeichen eine natur- und kulturwissenschaftliche Analyse am Beispiel von Speisequark /

Kalka, Edith. Unknown Date (has links)
Universiẗat, Diss., 2005--Kassel. / Erscheinungsjahr an der Haupttitelstelle: 2004.
156

RPA relativística para ressonâncias gigantes isovetoriais /

Socolowski Jr., O, (Otávio) January 1994 (has links)
Orientador: Alfredo Pio Noronha Rodrigues Galeão / Banca: Diógenes Galetti / Banca: Brett V. Carlson / Resumo: Utilizamos o modelo hidrodinâmico de emissão contínua de partículas para estudar vários dados experimentais do SPS/CERN. Dados sobre razões de partículas estranhas das colaborações WA85 e WA97 são usados para determinar um conjunto de condições iniciais para o fluxo hidrodinâmico. Testamos a autoconsistência do modelo estudando outros dados experimentais com as mesmas condições iniciais que reproduziram as razões de partículas estranhas. Mostramos que os espectros em massa transversal de NA35, WA85, NA49 e WA97 podem ser bem reproduzidas. A grande vantagem dessa abordagem (além de ser corroborada pelos modelos microscópicos) é que ela pode resolver, de um modo natural, alguns dos problemas enfrentados pelo modelo usual de freeze-out: possíveis altas densidades de partículas, pequena abundância de píons e temperatura incorreta do 'ômega' / Abstract: We use the hydrodynamical model of continuous particle emission to study several ex- perimental data from SPS/CERN. Data on strange particle ratios from WA85 and WA97 Collaborations are used to determine a set of initial conditions for the hydrodynamical flow. We test the self-consistency of the model by studying several other experimental data by using the same initial conditions that reproduce strange particle ratios. We show that the transverse mass spectra from WA35, WA85, NA49 and WA97 can be well repro- duced. We also reproduce particle abundances, including the tt one. The big advantage of this approach (in addition to being corroborated by microscopical models) is that it may solve, in a natural way, some of the problems met by the standard hydrodynamical approach with sudden freeze-out: possible too high densities, too small pion abundance and wrong 'ômega' temperature / Mestre
157

Phenomenology of Λb → Λcτν¯τ using lattice QCD calculations

Datta, Alakabha, Kamali, Saeed, Meinel, Stefan, Rashed, Ahmed 29 August 2017 (has links)
In a recent paper we studied the effect of new-physics operators with different Lorentz structures on the semileptonic Λb → Λcτν¯τ decay. This decay is of interest in light of the R(D(∗)) puzzle in the semileptonic B¯ → D(∗)τν¯τ decays. In this work we add tensor operators to extend our previous results and consider both model-independent new physics (NP) and specific classes of models proposed to address the R(D(∗)) puzzle. We show that a measurement of R(Λc) = B[Λb → Λcτν¯τ ]/B[Λb → Λcℓν¯ℓ] can strongly constrain the NP parameters of models discussed for the R(D(∗)) puzzle. We use form factors from lattice QCD to calculate all Λb → Λcτν¯τ observables. The Λb → Λc tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.
158

A measurement of spin correlation in top anti-top pairs and a search for top squarks at √s=8 TeV using the ATLAS detector

Neep, Thomas James January 2015 (has links)
The first measurement of the spin correlation strength in pairs of top quarks at √s=8 TeV is presented, using data collected using the ATLAS detector, corresponding to an integrated luminosity of 20.3 fb⁻¹. Dileptonically decaying tt^- events are selected with two high-pT leptons and at least two jets, one of which is required to be b-tagged. The azimuthal angle between the two charged leptons, Δφ, is used to measure the degree of spin correlation of top quark pairs. The extracted value of fSM, which is a measure of the spin-correlation strength, is fSM=1.20 ± 0.14. This is the most precise spin-correlation measurement to date. Using the Δφ distribution, a search for Supersymmetric top squarks is performed, with the assumption that the top squarks decay to a top quark and a neutralino. No excess of events is observed and top squarks with masses between the top quark mass and 191 GeV are excluded at 95% confidence level, extending previous limits.
159

Search for the Standard Model Higgs boson produced in association with a pair of top quarks and decaying into a bb-pair in the single lepton channel at √s = 13 TeV with the ATLAS experiment at the LHC

Mantoani, Matteo 28 June 2017 (has links)
No description available.
160

Search for pair production of scalar top quarks in jets and missing transverse energy channel with the D0 detector

Shamim, Mansoora January 1900 (has links)
Doctor of Philosophy / Department of Physics / Timothy A. Bolton / This dissertation describes a search for the pair production of scalar top quarks, tilde[subscript] 1, using a luminosity of 995 pb[superscript-1] of data collected in p[bar over]p collisions with the D0 detector at the Fermilab Tevatron Collider at a center-of-mass energy sqrt[s] = 1.96 TeV. Both scalar top quarks are assumed to decay into a charm quark and a neutralino, [tilde chi superscript 0 subscript 1]where [(tilde chi superscript 0 subscript 1)]is the lightest supersymmetric particle. This leads to a final state with two acoplanar charm jets and missing transverse energy. The yield of such events in data is found to be consistent with the expectations from known standard model processes. Sets of tilde [subscript 1] and tilde chi [superscript 0 subscript 1] masses are excluded at the 95% confidence level that substantially extend the domain excluded by previous searches. With the theoretical uncertainty on the pair production cross section taken into account, the largest limit for m[subscript tilde subscript 1] is m[subscript tilde chi subscript 1> 150 GeV, for m [subscript tilde chi negative 0 subscript 1]= 65 GeV.

Page generated in 0.0341 seconds