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Article
Parton energy loss without transverse momentum broadening
The Jewel 1.0 Monte Carlo simulates jet evolution in a medium with a microscopic description of splitting and scattering processes. In the framework of this model we investigate the transverse momentum broaden...
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Article
Small-x phenomenology – Summary of the 3rd Lund small-x workshop in 2004
A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the experimental stat...
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Article
Soft colour interactions and diffractive Higgs production
The topical subject of Higgs production in diffractive hard scattering events at the Tevatron and LHC is discussed. This has been proposed as a Higgs discovery channel with appealing experimental features. Pre...
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Article
String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies
The observed polarisation of Λ hyperons from the inclusive pA → ΛX reaction at high energies has previously been well described within the Lund string model through polarised s¯s quark pair production in the stri...
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Article
Soft and hard QCD dynamics in hadroproduction of charmonium
Both hard and soft QCD dynamics are important in charmonium production, as presented here through a next-to-leading order QCD matrix element calculation combined with the color evaporation model. The observed ...
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Chapter
Diffractive Hard Scattering
Diffraction is an old subject which has received much interest in recent years due to the advent of diffractive hard scattering. We discuss some theoretical models and experimental results that have shown new ...
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Article
Properties of HERA events from DIS on pions in the proton
Recently the concept of the pion cloud in the nucleon turned out to be successful in understanding the Gottfried sum rule violation observed by the New Muon Collaboration and the Drell-Yan asymmetry measured i...
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Article
Signals for intrinsic charm in high energy interactions
The prospects to test the hypothesis of intrinsic charm quarks in the proton are investigated. We consider how this component can be directly or indirectly probed in deep inelastic scattering at HERA and in fi...
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Article
Unified description of rapidity gaps and energy flows in DIS final states
We show that the ‘orthogonal’ characteristics of the observed rapidity gaps and large forward energy flows in deep inelastic scattering at HERA, can be described within a single framework. Our Monte Carlo mode...
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Article
Renormalisation scale uncertainty in the DIS 2+1 jet cross-section
The deep inelastic scattering 2+1 jet cross-section is a useful observable for precision tests of QCD, e.g. measuring the strong coupling constantα s. A consistent analysis requires a good understanding of the th...
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Article
Study of jet reconstruction algorithms for deep-inelastic events at HERA
Three commonly used jet algorithms and two new ones have been studied with respect to their performance in the new experimental situation of deep-inelastic scattering at the HERA electron-proton collider. Thei...
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Article
Heavy majorana neutrinos atep colliders
Heavy Majorana neutrinos (N), predicted in various extensions of the standard model, are examined with respect to the present limits on their masses and mixings with ordinary leptons resulting in explicit example...
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Article
The pomeron structure in DIS and gluon recombination effects
A formalism for diffractive deep inelastic scattering is presented based on the concept of a pomeron structure function. Assuming the pomeron to be essentially a gluonic object with the small size indicated by...
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Article
Separation of minimum and higher twist in photoproduction of high-P T mesons
Photo- and hadroproduction data in the beam energy range 65–175 GeV have been studied with a view to isolating higher-twist processes in photoproduction from other point-like and hadron-like contributions. Wit...
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Article
Testing QCD scaling violations in the HERA energy range
High energy electron-proton colliders open new kinematical domains for the investigation of scaling violations in nucleon structure functions. Focussing on HERA as a definite study case we explore the precisio...
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Article
Quark momentum distributions fromep collisions: strategies and prospects
We present the results of a comprehensive investigation of possibilities to extract structure functions and momentum distributions of individual quark flavours from cross-section measurements atep colliders. Appr...
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Article
Measurement of the longitudinal structure function and the smallx gluon density of the proton
At HERA energies the smallx region (x≲10−2) can be explored atQ 2 values large enough that leading twist QCD calculations are valid. We show how measurement of the longitudinal structure function,F ...
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Article
Characteristics of heavy flavour production inep collisions
The production of heavy flavours inep collisions at the HERA energy is studied using a model based on boson-gluon fusion into a heavy quark-antiquark pair followed by gluon emission and string hadronization. Tota...
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Article
Jet reconstruction and jet properties at HERA
We discuss jet reconstruction methods with respect to their suitability forep collisions at HERA and study the expected properties of such jets. The results are based on complete event simulation using current mo...
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Chapter
Soft Process in Very High Energy Proton-Proton Collisions
Soft processes in terms of fragmentation of high-p⊥ and low-p⊥ jets are considered in relation to the high and low momentum transfer mechanisms that produce them. The evolution of high-p⊥ jets can be reliably ...
