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Study of Very Forward Neutrons with the CMS Zero Degree Calorimeter

by Olivér Surányi on Behalf of the CMS Collaboration
MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, 1053 Budapest, Hungary
Universe 2019, 5(10), 210; https://doi.org/10.3390/universe5100210
Received: 15 August 2019 / Revised: 4 October 2019 / Accepted: 5 October 2019 / Published: 9 October 2019
(This article belongs to the Special Issue The Zimányi School and Analytic Hydrodynamics in High Energy Physics)
Forward neutrons are studied in proton-lead collisions at the CMS experiment at the CERN LHC. They provide information on the centrality and event plane of collisions and provide an opportunity to study nuclear breakup. At the CMS experiment they are detected by the Zero Degree Calorimeters (ZDCs) in the | η | > 8.5 pseudorapidity range. The ZDCs are quartz fiber Cherenkov calorimeters using tungsten as absorber. Test beam data and events with a single spectator neutron are used for the calibration of these detectors. A Fourier-based method is used correct for the effect of multiple pPb collisions. The corrected ZDC energy distribution is used to calculate centrality percentiles and unfold the neutron multiplicity distribution. View Full-Text
Keywords: forward neutrons; zero degree calorimetry; centrality; heavy ions forward neutrons; zero degree calorimetry; centrality; heavy ions
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Surányi, O., on Behalf of the CMS Collaboration; Study of Very Forward Neutrons with the CMS Zero Degree Calorimeter. Universe 2019, 5, 210.

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