Cobra Performance

This note presents the performance of the Cobra combined muon reconstruction package. It consists of two parts: the first part gives a proof of concept of the generic fit, as implemented in Cobra, and tests the fit qualitatively. The second part uses single tracks to estimate the Cobra 'physics' performance and compares the resultant momentum resolutions with those of the final fits of the Atlas pattern recognition packages iPatRec and Muonbox. The performance of the combined, global fit is compared to the results of the muon identification package MuID

The Athena Startup Kit

The Athena Startup Kit (ASK), is an interactive front-end to the Atlas software framework (ATHENA). Written in python, a very effective "glue" language, it is build on top of the, in principle unrelated, code repository, build, configuration, debug, binding, and analysis tools. ASK automates many error-prone tasks that are otherwise left to the end-user, thereby pre-empting a whole category of potential problems. Through the existing tools, which ASK will setup for the user if and as needed, it locates available resources, maintains job coherency, manages the run-time environment, allows for interactivity and debugging, and provides standalone execution scripts. An end-user who wants to run her own analysis algorithms within the standard environment can let ASK generate the appropriate skeleton package, the needed dependencies and run-time, as well as a default job options script. For new and casual users, ASK comes with a graphical user interface; for advanced users, ASK has a scriptable command line interface. Both are built on top of the same set of libraries. ASK does not need to be, and isn't, experiment neutral. Thus it has built-in workarounds for known gotcha's, that would otherwise be a major time-sink for each and every new user. ASK minimizes the overhead for those physicists in Atlas who just want to write and run their analysis code

Cobra Overview

This note provides an overview of the COmBined Reconstruction for Atlas (Cobra) package. Cobra extends on the L3 Geane package and implements a combined muon reconstruction in Atlas. The concepts behind the package, the assumptions made and their implications in a general sense are documented here, but their validity and their implications for Atlas in specific are investigated in an upcoming note

The Athena Startup Kit

The Athena Startup Kit (ASK), is an interactive front-end to the Atlas software framework (ATHENA). Written in python, a very effective "glue" language, it is build on top of the, in principle unrelated, code repository, build, configuration, debug, binding, and analysis tools. ASK automates many error-prone tasks that are otherwise left to the end-user, thereby pre-empting a whole category of potential problems. Through the existing tools, which ASK will setup for the user if and as needed, it locates available resources, maintains job coherency, manages the run-time environment, allows for interactivity and debugging, and provides standalone execution scripts. An end-user who wants to run her own analysis algorithms within the standard environment can let ASK generate the appropriate skeleton package, the needed dependencies and run-time, as well as a default job options script. For new and casual users, ASK comes with a graphical user interface; for advanced users, ASK has a scriptable command line interface. Both are built on top of the same set of libraries. ASK does not need to be, and isn't, experiment neutral. Thus it has built-in workarounds for known gotcha's, that would otherwise be a major time-sink for each and every new user. ASK minimizes the overhead for those physicists in Atlas who just want to write and run their analysis code

GANGA: a user-Grid interface for Atlas and LHCb

The Gaudi/Athena and Grid Alliance (GANGA) is a front-end for the configuration, submission, monitoring, bookkeeping, output collection, and reporting of computing jobs run on a local batch system or on the grid. In particular, GANGA handles jobs that use applications written for the Gaudi software framework shared by the Atlas and LHCb experiments. GANGA exploits the commonality of Gaudi-based computing jobs, while insulating against grid-, batch- and framework-specific technicalities, to maximize end-user productivity in defining, configuring, and executing jobs. Designed for a python-based component architecture, GANGA has a modular underpinning and is therefore well placed for contributing to, and benefiting from, work in related projects. Its functionality is accessible both from a scriptable command-line interface, for expert users and automated tasks, and through a graphical interface, which simplifies the interaction with GANGA for beginning and c1asual users. This paper presents the GANGA design and implementation, the development of the underlying software bus architecture, and the functionality of the first public GANGA release

Search for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 20 fb−1 of √s= 8 TeV proton-proton collision data with the ATLAS detector

© 2014, The Author(s). A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, at least one hadronically decaying tau lepton and zero or one additional light leptons (electron/muon), has been performed using 20.3fb−1of proton-proton collision data at √ s= 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed in the various signal regions and 95% confidence level upper limits on the visible cross section for new phenomena are set. The results of the analysis are interpreted in several SUSY scenarios, significantly extending previous limits obtained in the same final states. In the framework of minimal gauge-mediated SUSY breaking models, values of the SUSY breaking scale Λ below 63 TeV are excluded, independently of tan β. Exclusion limits are also derived for an mSUGRA/CMSSM model, in both the R-parity-conserving and R-parity-violating case. A further interpretation is presented in a framework of natural gauge mediation, in which the gluino is assumed to be the only light coloured sparticle and gluino masses below 1090 GeV are excluded