“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 8901
School of Particles and Accelerator
  Title:   Design, performance, and calibration of CMS forward calorimeter wedges
1.  Mohammad Mohammadi Baarmand
2.  Mojtaba Mohammadi Najafabadi
3.  Saeid Paktinat
  Status:   Published
  Journal: Eur. Phys. J. C
  Vol.:  53
  Year:  2008
  Pages:   139-166
  Supported by:  IPM
We report on the test beam results and calibration methods using high energy electrons, pions and muons with the CMS forward calorimeter (HF). The HF calorimeter covers a large pseudorapidity region (3 #8804; - #951; - #8804; 5), and is essential for a large number of physics channels with missing transverse energy. It is also expected to play a prominent role in the measurement of forward tagging jets in weak boson fusion channels in Higgs production. The HF calorimeter is based on steel absorber with embedded fused-silica-core optical fibers where Cherenkov radiation forms the basis of signal generation. Thus, the detector is essentially sensitive only to the electromagnetic shower core and is highly non-compensating (e/h #8776; 5). This feature is also manifest in narrow and relatively short showers compared to similar calorimeters based on ionization. The choice of fused-silica optical fibers as active material is dictated by its exceptional radiation hardness. The electromagnetic energy resolution is dominated by photoelectron statistics and can be expressed in the customary form as #8730;a E #8853;b. The stochastic term a is 198constant term b is 9neutral pion production in showers, and when it is expressed as in the electromagnetic case, a = 280and b = 11

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