Some text from the Atlas workbook that uses this plugin

ATLAS (A Toroidal LHC ApparatuS) is one of two General Purpose Detectors at the CERN Large Hadron Collider (LHC). The LHC will collide 7 TeV protons together with a centre of mass energy of 14 TeV and a design luminosity of $10^{34}\mathrm{cm}^{-2}\mathrm{s}^{-1}$. The bunch crossing time will be 25ns and at full luminosity there will be approximately 22 proton-proton collisions per bunch crossing. The ATLAS Detector is situated at Point 1, directly opposite the CERN main entrance. The ATLAS detector consists of four major components, the Inner Tracker which measures the momentum of each charged particle, the Calorimeter which measures the energies carried by the particles, the Muon spectrometer which identifies and measures muons and the Magnet system that bends charged particles for momentum measurement. The detector is a cylinder with a total length of 42 m and a radius of 11 m and weighs approximately 7000 tonnes.

The ATLAS Coordinate System

The ATLAS Coordinate System is a right-handed system with the $x$-axis pointing to the centre of the LHC ring, the $z$-axis following the beam direction and the $y$-axis going upwards. In Point 1, positive $z$ points towards Point 8 with a slope of -1.23%. The azimuthal angle $\phi=0$ corresponds to the positive $x$-axis and $\phi$ increases clock-wise looking into the positive $z$ direction. The polar angle $\theta$ is measured from the positive $z$ axis. Pseudorapidity, $\eta$, is defined by
\[\eta = - \log \left(\tan \frac{\theta}{2}\right)\]
Transverse momentum, $p_T$, is defined as the momentum perpendicular to the LHC beam axis.

-- PeterJones - 19 Nov 2007

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