Johan Rathsman

A generalised area law for hadronic string reinteractions

Abstract A new model for hadronic string reinteractions based on a generalised area law is presented. The model describes both the hadronic final states in e + e − annihilation and the diffractive structure function in deep inelastic scattering. The model also predicts a shift in the W-mass reconstructed from hadronic decays of W-pairs of the order 65 MeV.

Odderon-Pomeron Interference ∗

Abstract We show that the asymmetry in the fractional energy of charm versus anticharm jets produced in high energy diffractive photoproduction is sensitive to the interference of the Odderon ( C =−) and Pomeron ( C =+) exchange amplitudes in QCD. We predict the dynamical shape of the asymmetry in a simple model and estimate its magnitude to be of the order 15% using an Odderon coupling to the proton which saturates constraints from proton-proton vs. proton-antiproton elastic scattering. Measurements of this asymmetry at HERA could provide firm experimental evidence for the presence of Odderon exchange in the high energy limit of strong interactions.

Quarkonium production at the Fermilab Tevatron through soft color interactions

The direct charmonium and bottomonium production rate observed at high [Formula presented] in [Formula presented] collisions at the Fermilab Tevatron is factors of 10 larger than predictions based on conventional perturbative QCD. We show that this excess can be accounted for by our model for soft color interactions, previously introduced to describe in a novel way the large rapidity gap events observed at DESY HERA.

The Two-Loop Scale Dependence of the Static QCD Potential including Quark Masses

The interaction potential V(Q{sup 2}) between static test charges can be used to define an effective charge {alpha}{sub V}(Q{sup 2}) and a physically-based renormalization scheme for quantum chromodynamics and other gauge theories. In this paper we use recent results for the finite-mass fermionic corrections to the heavy-quark potential at two-loops to derive the next-to-leading order term for the Gell Mann-Low function of the V-scheme. The resulting effective number of flavors N{sub F}(Q{sup 2}/m{sup 2}) in the {alpha}{sub V} scheme is determined as a gauge-independent and analytic function of the ratio of the momentum transfer to the quark pole mass. The results give automatic decoupling of heavy quarks and are independent of the renormalization procedure. Commensurate scale relations then provide the next-to-leading order connection between all perturbatively calculable observables to the analytic and gauge-invariant {alpha}{sub V} scheme without any scale ambiguity and a well defined number of active flavors. The inclusion of the finite quark mass effects in the running of the coupling is compared with the standard treatment of finite quark mass effects in the {ovr MS} scheme.

Analytic extension of the modified minimal subtraction renormalization scheme

The conventional definition of the running coupling

Differences between Monte Carlo models for DIS at small x and the relation to BFKL dynamics

\alpha_{\bar{MS}}(\mu)

Soft color exchanges and the hadronic final state

in quantum chromodynamics is based on a solution to the renormalization group equations which treats quarks as either completely massless at a renormalization scale

Jet asymmetry and the detection of Odderon exchange in DIS

\mu

Rapidity gaps from colour string topologies

above their thresholds or infinitely massive at a scale below them. The coupling is thus nonanalytic at these thresholds. In this paper we present an analytic extension of

Soft colour interactions in non-perturbative QCD

\alpha_{\bar{MS}}(\mu)