ABSTRACT We introduce zeus, a well-tested Python implementation of the Ensemble Slice Sampling (ESS) method for Bayesian parameter inference. ESS is novel Markov chain Monte Carlo (MCMC) algorithm specifically designed to tackle computational challenges posed by modern astronomical and cosmological analyses. In particular, requires only minimal hand-tuning 1−2 hyperparameters that are often tri...

(on behalf of the H1 and ZEUS collaborations) The H1 and ZEUS collaborations have used the HERA I data to search for physics beyond the SM and to test electroweak physics in electron-proton collisions. The new period of data taking (HERA II) has started and first HERA II analyses become available. An overview is given of recent highlights, including isolated lepton and multi-lepton events, test...

The upgrade of the HERA accelerator has provided much increased collider luminosity. In turn, the improvements have necessitated a new design for the ZEUS luminosity measurements. The intense synchrotron radiation field, as well as the high probability of a bremsstrahlung photon in each bunch crossing, posed new experimental constraints. In this report, we describe how these challenges were met...

There is an emerging desire among agent researchers to move away from developing point solutions to point problems in favour of developing methodologies and tool-kits for building distributed multi-agent systems. This philosophy has led to the development of the ZEUS agent building tool-kit, which facilitates the engineering of collaborative agent applications through the provision of a library...

Many have argued that anthropology, as a four-field discipline, lacks intellectual coherence. Recent developments in the field of biotechnology and the possibility of producing chimeras with recognizable human characteristics make it necessary to think in terms of a new kind of “old” four-field holism. The production of a human/nonhuman chimera raises theoretical questions about the nature of t...

The H1 and ZEUS Collaborations have performed searches for events with high energy leptons and missing transverse momentum in the positron-proton collisions collected at p s = 300 GeV between 1994 and 1997. Altogether 9 candidates were found, of which 4 e and 2 events behave as expected from exclusive W-boson production,whereas 3 events show kinematicproperties atypicalof all Standard Model pro...

Inelastic J/ψ photoproduction is an interesting area where one can test QCD predictions. This article reviews the recent experimental results obtained by the ZEUS and H1 Collaborations. Single differential and double differential cross sections have been measured by the H1 Collaboration using an integrated luminosity of 166 pb −1 , taken in the years 2006-2007. The J/ψ decay angular distributio...

Representing the H1 and ZEUS collaborations Recent results from the HERA experiments H1 and ZEUS on the exclusive production of heavy vector mesons V in ep collisions, i.e. the reaction ep ! eV p, are reviewed. The new measurements 1 include photoproduction of J== at larger photon-proton centre-of-mass energy W than previously, more precise data on J== electroproduction and (2S) photoproduction...

A search for physics beyond the Standard Model is performed using high-Q 2 deep inelastic e ± p scattering data, corresponding to a total integrated luminosity of about 0.5 fb −1 per experiment, collected with the H1 and ZEUS detectors at HERA. ZEUS derives limits on the effective mass scale in eeqq contact interactions, on the ratio of the mass to the Yukawa coupling for heavy-leptoquark model...