Measurement of the groomed jet mass in PbPb and pp collisions at √sNN=5.02 TeV
A measurement of the groomed jet mass in PbPb and pp collisions at a nucleonnucleon center-of-mass energy of 5.02 TeV with the CMS detector at the LHC is presented. Jet grooming is a recursive procedure which sequentially removes soft constituents of a jet until a pair of hard subjets is found. Th...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Nature
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/69693/ http://irep.iium.edu.my/69693/ http://irep.iium.edu.my/69693/ http://irep.iium.edu.my/69693/1/69693_Measurement%20of%20the%20groomed%20jet%20mass%20in%20PbPb%20_article.pdf http://irep.iium.edu.my/69693/2/69693_Measurement%20of%20the%20groomed%20jet%20mass%20in%20PbPb%20_scopus.pdf |
| Summary: | A measurement of the groomed jet mass in PbPb and pp collisions at a nucleonnucleon center-of-mass energy of 5.02 TeV with the CMS detector at the LHC is presented.
Jet grooming is a recursive procedure which sequentially removes soft constituents of a
jet until a pair of hard subjets is found. The resulting groomed jets can be used to
study modifications to the parton shower evolution in the presence of the hot and dense
medium created in heavy ion collisions. Predictions of groomed jet properties from the
pythia and herwig++ event generators agree with the measurements in pp collisions.
When comparing the results from the most central PbPb collisions to pp data, a hint of
an increase of jets with large jet mass is observed, which could originate from additional
medium-induced radiation at a large angle from the jet axis. However, no modification of
the groomed mass of the core of the jet is observed for all PbPb centrality classes. The PbPb
results are also compared to predictions from the jewel and q-pythia event generators,
which predict a large modification of the groomed mass not observed in the data. |
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