Abstract
A selection of results obtained with very forward detectors of the CMS experiment at LHC is presented. Studies of the energy flow, d E ⁄d η , are extended into very forward region with CASTOR calorimeter (−6.6 η < 5.2) for pp collisions at 3 different center-of-mass energies (0.9, 2.76 and 7 TeV) and PbPb collisions at 2.76A TeV. Results are compared to hadronic interaction models as implemented in standard collider physics generators and generators used in cosmic-ray physics.
Highlights
At the collider energy frontier and with the most complete detector pseudorapidity coverage the Compact Muon Solenoid (CMS) experiment is a perfect laboratory to uncover the long-awaited signatures of a possible new parton dynamics regime at low x
Using minimum bias PbPb collision events collected by CMS at nominal magnetic field at center-of-mass energy of 2.76 TeV per nucleon it is possible to extend the absolute measurement of the energy flow, dE/dη, into the region close to the beam rapidity [4, 5]
First results obtained with CMS forward CASTOR calorimeter using pp and PbPb collision data are presented
Summary
At the collider energy frontier and with the most complete detector pseudorapidity coverage the CMS experiment is a perfect laboratory to uncover the long-awaited signatures of a possible new parton dynamics regime at low x. Benchmark measurements performed in CMS provide valuable information for standard collider Monte Carlo model tuning. In particular interesting is testing against the data the cosmic-ray hadronic Monte Carlo models ( , , ) which are assumed to provide best extrapolation up to highest interaction energies
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