Olivier Couet

CERN | CERN · Software Design for Experiments Group (SFT)

ROOT is high energy physics' software for storing and mining data in a statistically sound way, to publish results with scientific graphics. It is evolving since 25 years, now providing the storage format for more than one exabyte of data; virtually all high energy physics experiments use ROOT. With another significant increase in the amount of dat...

This document discusses the state, roadmap, and risks of the foundational components of ROOT with respect to the experiments at the HL-LHC (Run 4 and beyond). As foundational components, the document considers in particular the ROOT input/output (I/O) subsystem. The current HEP I/O is based on the TFile container file format and the TTree binary ev...

The high energy physics community is discussing where investment is needed to prepare software for the HL-LHC and its unprecedented challenges. The ROOT project is one of the central software players in high energy physics since decades. From its experience and expectations, the ROOT team has distilled a comprehensive set of areas that should see r...

In the context of ROOT7, the graphics system is completely redefined. Based on client server architecture and with the use of modern C++ and JavaScript, ROOT7 provides a new web based graphics system. The new concepts of ROOT7 can be displayed directly in the browsers using the new classes for opening a new web window, communicate with the server a...

The ATLAS experiment records data from the proton-proton collisions produced by the Large Hadron Collider (LHC). The Tile Calorimeter is the hadronic sampling calorimeter of ATLAS in the region | η | < 1.7 . It uses iron absorbers and scintillators as active material. Jointly with the other calorimeters it is designed for reconstruction of hadrons,...

Following the release of version 6, ROOT has entered a new area of development. It will leverage the industrial strength compiler library shipping in ROOT 6 and its support of the C++11/14 standard, to significantly simplify and harden ROOT's interfaces and to clarify and substantially improve ROOT's support for multi-threaded environments. This ta...

Rainbow Color Definition Problems Color maps in High Energy Physics How the rainbow color map can mask structure in the data From a rainbow color map plot to a more meaningful one Rainbow color map in linear scale Dark Body Radiator color map in linear scale Rainbow color map in logarithmic scale Dark Body Radiator color map in logarithmic scale Su...

A new stable version ("production version") v5.28.00 of ROOT [1] has been published [2]. It features several major improvements in many areas, most noteworthy data storage performance as well as statistics and graphics features. Some of these improvements have already been predicted in the original publication Antcheva et al. (2009) [3]. This versi...

The ROOT [1] graphical framework provides support for many different functions including basic graphics, high-level visualization techniques, output on files, 3D viewing etc. They use well-known world standards to render graphics on screen, to produce high-quality output files, and to generate images for Web publishing. Many techniques allow visual...

https://ref.web.cern.ch/ref/CERN/CNL/2001/001/paw/

The Anaphe project is an ongoing effort to provide an Object Oriented software environment for data analysis in HENP experiments. A range of commercial and public domain libraries is used to cover basic functionalities; on top of these libraries a set of HENP-specific C++ class libraries for histogram management, fitting, plotting and ntuple-like d...

This paper starts by indicating the motivation for the rewrite of the Ntuple handling part of P AW. A list of the major improvements and new features is presented as well as a discussion of the compatibility with the old system. Some ideas for future developments are outlined. 1 Interactive Analysis of Ntuples in PAW. The interactive analysis of hi...

During the last twenty years, CERN has played a leading role as the focus for development of packages and software libraries to solve problems related to high energy physics (HEP). The results of the integration of resources from many different laboratories can be expressed in several million lines of code written at CERN during this period of time...

In recent years interactive data analysis and presentation packages have become more and more attractive on conventional timesharing systems. The advent of personal workstations with their good response time and powerful graphics capabilities is making these systems even more popular. PAW has been designed in that spirit. It combines the best featu...