Abstract
Recent set of structure functions, branching ratios and the current understanding of detector performance lead to a new evaluation of the CP reach of CMS. Compared to previous analysis, expected numbers of fully reconstructed and μ tagged B events are smaller, but are partly recovered thanks to progress on low pT electron identification based upon the high-resolution and fine granular electromagnetic calorimeter. This allow to use electrons for tagging purpose as well as for J/ψ − e+e− reconstruction.
Highlights
SUPERCONDUCTINCGOILIn Compact Muon Solenoid (CMS) a uniform magnetic field of 4 T is produced by a superconducting solenoid of 13 m length and 6 m diameter
2 The CMS detector In CMS a uniform magnetic field of 4 T is produced by a superconducting solenoid of 13 m length and 6 m diameter
The inner tracker, electromagnetic (ECAL) and hadron (HCAL) calorimeters are located inside the coil
Summary
In CMS a uniform magnetic field of 4 T is produced by a superconducting solenoid of 13 m length and 6 m diameter. The inner tracker consists of three parts: silicon pixels (two layers located at mean radii of 7.7 and 11.7 cm for barrel, Total Weight : Overall diameter : Overall length : Magnetic field : VERY FORWARD CALORIMETER and three for endcap) are closest to the beam pipe, silicon microstrips are located behind the pixels and microstrip. In front of the endcap ECAL a preshower (SF) is placed; it consists of two planes of silicon strip detectors interleaved with lead planes of 2 X0 and 1X0, respectively. This detector is primarily designed to measure impact points of photons, and helps for electron/hadron separation. The expected ECAL energy resolution in the barrel is shown in Fig., where a stands for the stochastic term, b for.
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