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Design, performance, and calibration of the CMS hadron-outer calorimeter

2008    Abdullin, S.; Abramov, V.; Acharya, B.; Adam, N.; Adams, M.; Akchurin, N.; Akgun, U.; Albayrak, E.; Anderson, E. W.; Antchev, G.; Arcidy, M.; Ayan, S.; Aydin, S.; Aziz, T.; Baarmand, M.; Babich, K.; Baden, D.; Bakirci, M. N.; Banerjee, Sudeshna; Banerjee, Sunanda; Banerjee, Sunanda

The Outer Hadron Calorimeter (HCAL HO) of the CMS detector is designed to measure the energy that is not contained by the barrel (HCAL HB) and electromagnetic (ECAL EB) calorimeters. Due to space limitation the barrel calorimeters do not contain completely the hadronic shower and an outer calorimeter (HO) was designed, constructed and inserted in the muon system of CMS to measure the energy leakage. Testing and calibration of the HO was carried out in a 300 GeV/c test beam that improved the linearity and resolution. HO will provide a net improvement in missing E (T) measurements at LHC energies. Information from HO will also be used for the muon trigger in CMS.