Phd defense by Casper Nygaard – University of Copenhagen

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Phd defense by Casper Nygaard

Charged particle multiplicity distributions into forward pseudo-rapidities at the LHC. 


Abstract:

The Large Hadron Collider has successfully provided relativistic collisions of protons on protons and lead-ions on lead ions at unprecedented collision energies. This thesis defense presents result from the ALICE experiment of charged particle multiplicity distributions over various intervals in pseudo-rapidity. By combining sub-detectors in ALICE is is possible to present measurements spanning more than 8 units of pseudo-rapidity. 

This thesis defense presents result from the ALICE experiment of charged particle multiplicity distributions over the widest possible pseudo-rapidity range. By combining sub-detectors in ALICE is is possible to present measurements spanning more than 8 units of pseudo-rapidity, and segmented in various ways. Measurements of charged particle multiplicities yield crucial input for the phenomenologists, when modeling particle production and collision dynamics. In addition to charged particle multiplicity distributions, results on KNO scaling violation are also presented. KNO scaling is a proposed universal energy scaling of particle production, which has been shown to be violated at lower energies due to the changing collision dynamics at high collision energies. 

The results will be presented for the first time ever at this thesis defense.