Alec Aivazis edited The CMS Detector`.tex  over 9 years ago

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\section{The CMS detector}\label{sect:CMS}  At the core of the CMS detector is a superconducting solenoid that is 6m in diameter, 13m long, and generates a 4T field which is used to determine the sign of the charge of the particle. On the outside of the magnet is an electromagnetic calorimeter (ECAL) which is designed to measure electromagnetic deposits. After the products of the decay have passed through the ECAL, they reach a brass/scintilator hadronic calorimeter (HCAL) which absorbs most of the energy left in the collision. The particles that do make it through the HCAL are either neutrinos or muons. The muons are detected and collected in a separate configuration around the magnet composed of a drift tube and cathode-strip detector\cite{AUFFRAY_2002}\cite{Pooth_2010}\cite{Khachatryan_2014}  and since the effects of baryonic matter on neutrinos is taken to be negligible by the reconstruction algorithms, neutrinos appear in the data as missing energy in the transverse direction (MET). (MET) \cite{AUFFRAY_2002}\cite{Pooth_2010}\cite{Khachatryan_2014}.  CMS uses a right-handed coordinate system whose origin is at the point of interaction between the two proton beams, $x$-axis pointing to the center of the LHC, $y$-axis perpendicular to the plane created by the beam, and $z$-axis in the anticlockwise-beam direction, and $\theta$ measured from the positive $z$-axis \cite{Khachatryan_2014}. For a detailed description of the CMS detector see ref \cite{Collaboration_2008}.