Abstract
Two neutral particle detectors, Zero Degree Calorimeters (ZDCs) at the LHC-CMS experiment, cover the |η| > 8.5 region. The ZDCs are Cherenkov calorimeters that use tungsten as the absorber and quartz clad quartz fibers as the active medium. They have a five element electromagnetic section followed by a hadronic section divided into four depth segments. For the 2016 pPb run, the ZDCs were calibrated using test beam data and the single spectator neutron peak at 2.56 TeV. Peaks corresponding to 1, 2 and 3 neutrons are visible in the ZDC total signal distribution. The effect of pileup is corrected by a Fourier deconvolution method. Using this, the spectator neutron number distribution can be unfolded by a linear regularization method. This information serves as a strong constraint to models of pPb collisions and has the potential to produce an unbiased measure of centrality in pPb collisions.
Highlights
The Zero Degree Calorimeters (ZDCs) at the LHC-CMS experiment are Cherenkov calorimeters that observe very forward (|η| > 8.5) neutral products [1]
They have a five element electromagnetic section followed by a hadronic section divided into four depth segments
In heavy ion and hadron-nucleus collisions the main contribution is due to the spectator neutrons, which can be used as a centrality estimator [2]
Summary
The Zero Degree Calorimeters (ZDCs) at the LHC-CMS experiment are Cherenkov calorimeters that observe very forward (|η| > 8.5) neutral products [1]. Zero Degree Calorimeters (ZDCs) at the LHC-CMS experiment, cover the |η| > 8.5 region. For the 2016 pPb run, the ZDCs were calibrated using test beam data and the single spectator neutron peak at 2.56 TeV.
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