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40 papers · 1 filter
Heavy Flavours in Collider Experiments
R D St. Denis
Current issues in the studies of Heavy Flavours in colliders are described with particular emphasis on experiments in which the UK is involved. Results on charm production at HERA…
Mass Measurement of the W-boson using the ALEPH Detector at LEP
A. S. Thompson
The W-boson mass has been measured using the ALEPH detector at LEP. Preliminary results from data taken in 1998 are added to previous measurements to give mW = 80.411 +- 0.064(stat…
Hadronic Final States in Deep Inelastic Scattering at HERA
N. H. Brook
Results on the analysis of the hadronic final state in neutral current deep inelastic scattering at HERA are presented; recent results on inclusive single particle distributions, p…
A Comparison of Deep Inelastic Scattering Monte Carlo Event Generators to HERA Data
N. H. Brook, T. Carli, E. Rodrigues +3
The Monte Carlo models ARIADNE, HERWIG and LEPTO are compared to deep-inelastic scattering data measured at the ep-collider HERA.
Hard Photoproduction and the Structure of the Photon
Laurel Sinclair
A pedagogical introduction to the experimental results on hard photoproduction at HERA is provided. Then the latest results in this field from ZEUS and H1 are reviewed.
Event Shapes and Forward Jet Production at HERA
A. T. Doyle
Analyses of event shapes and forward jet production in deep inelastic scattering at the HERA collider are described. The results are compared to QCD predictions.
The ramifications of the centres: quantised function algebras at roots of unity
K. A. Brown, I. Gordon
Let H be a Hopf algebra which is a finite module over a central sub-Hopf algebra R. We continue the study of such algebras begun in RT/9911234, concentrating in this case on the ex…
Heavy-light Mesons and Baryons with b quarks
A. Ali Khan, T. Bhattacharya, S. Collins +5
We present lattice results for the spectrum of mesons containing one heavy quark and of baryons containing one or two heavy quarks. The calculation is done in the quenched approxim…
Pendulum Mode Thermal Noise in Advanced Interferometers: A comparison of Fused Silica Fibers and Ribbons in the Presence of Surface Loss
Andri M. Gretarsson, Sheila Rowan, Geppo Cagnoli +5
The use of fused-silica ribbons as suspensions in gravitational wave interferometers can result in significant improvements in pendulum mode thermal noise. Surface loss sets a lowe…
Prompt photon processes in photoproduction at HERA
Sung Won Lee
We present results for the photoproduction of inclusive prompt photons and for prompt photons accompanied by jets, measured with the ZEUS detector at HERA. Cross sections as a func…
Comparison of Dijet Cross Sections vs Q^2 with Various Monte Carlo Models
N. Macdonald
The dijet cross section as a function of both the fraction of the photon momentum participating in the hard process, x_γ^{OBS}, and the photon's virtuality, Q^2, is compared with t…
Structure of Real and Virtual Photons from ZEUS
N. Macdonald
Measurements sensitive to the structure of both real and virtual photons are presented and compared to theoretical models with various photon parton distribution functions (PDFs).…
Analysis of trap spectra in LEC and epitaxial GaAs
J. Vaitkus, E. Gaubas, V. Kazukauskas +5
Different methods of trap parameter measurement are analysed. Transient photoconductivity and thermally stimulated effects were used to investigate the influence of traps in LEC SI…
A Compact Solid State Detector for Small Angle Particle Tracking
S. Altieri, O. Barnaba, A. Braghieri +11
MIDAS (MIcrostrip Detector Array System) is a compact silicon tracking telescope for charged particles emitted at small angles in intermediate energy photonuclear reactions. It was…
Measurement of the e+e- -> ZZ production cross-section at centre-of-mass energies of 183 and 189GeV
ALEPH Collaboration
The ee -> ZZ cross section at sqrt(s)=182.7 and 188.6 GeV has been measured using the ALEPH detector. The analysis covers all of the visible ZZ final states and yields cross sectio…
Undermining the Cosmological Principle: Almost Isotropic Observations in Inhomogeneous Cosmologies
R. K. Barrett, C. A. Clarkson
We challenge the widely held belief that the cosmological principle is an obvious consequence of the observed isotropy of the cosmic microwave background radiation, combined with t…
Reheating Temperature and Inflaton Mass Bounds from Thermalization After Inflation
John McDonald
We consider the conditions for the decay products of perturbative inflaton decay to thermalize. The importance of considering the full spectrum of inflaton decay products in the th…
Photoproduction at low Q^2
Peter J. Bussey
The past year has seen a number of important developments in hard photoproduction physics at the HERA Collider. These are surveyed.
Commensurability oscillations due to pinned and drifting orbits in a two-dimensional lateral surface superlattice
David E. Grant, Andrew R. Long, John H. Davies
We have simulated conduction in a two-dimensional electron gas subject to a weak two-dimensional periodic potential, . The usual commensurability…
Investigation of the Exclusive 3He(e,e'pp) Reaction
D. L. Groep, M. F. van Batenburg, Th. S. Bauer +24
Cross sections for the 3He(e,e'pp)n reaction were measured at an energy transfer of 220 MeV and three-momentum transfers q of 305, 375, and 445 MeV/c. Results are presented as a fu…
Semi-leptonic decays heavy-light to heavy light
J. Hein, P. Boyle, C. T. H. Davies +2
We present results for the QCD matrix elements involved in semi-leptonic decays of B-mesons into pseudo scalar heavy light states. The application of NRQCD heavy quarks allows for…
A robust method for measuring the Hubble parameter
M. A. Hendry, S. Rauzy
We obtain a robust, non-parametric, estimate of the Hubble constant from galaxy linear diameters calibrated using HST Cepheid distances. Our method is independent of the parametric…
Determination of the E2/M1 Ratio in the γN \to Δ(1232) Transition from a Simultaneous Measurement of p(\vecγ,p)π^0 and p(\vecγ,π^+)n
R. Beck
Tagged linearly polarized photons have been used at the Mainz Microtron MAMI for simultaneous measurements of the p(\vecγ,p)π^0 and p(\vecγ,π^+)n reaction channels to study the γN…
Summary of activities in the Working Group on QCD Cascades of the HERA Monte Carlo workshop
Nick Brook, Leif Lonnblad
We summarize the activities in working group 10 concerned with QCD cascades, and find that although much work still needs to be done, much progress was made during this workshop in…