Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets
Measurements of fragmentation functions for jets associated with an isolated photon are presented for the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the CERN LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Fragmentation functions ar...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70737/ http://irep.iium.edu.my/70737/1/70737_Observation%20of%20Medium-Induced%20Modifications_article.pdf http://irep.iium.edu.my/70737/2/70737_Observation%20of%20Medium-Induced%20Modifications_scopus_new.pdf |
| _version_ | 1848787341471121408 |
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| author | Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli |
| author_facet | Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli |
| author_sort | Sirunyan, A. M. |
| building | IIUM Repository |
| collection | Online Access |
| description | Measurements of fragmentation functions for jets associated with an isolated photon are presented for
the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the
CERN LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Fragmentation functions are obtained
for jets with pjet
T > 30 GeV=c in events containing an isolated photon with pγ
T > 60 GeV=c, using charged
tracks with transverse momentum ptrk
T > 1 GeV=c in a cone around the jet axis. The association with an
isolated photon constrains the initial pT and azimuthal angle of the parton whose shower produced the jet.
For central Pb-Pb collisions, modifications of the jet fragmentation functions are observed when compared
to those measured in pp collisions, while no significant differences are found in the 50% most peripheral
collisions. Jets in central Pb-Pb events show an excess (depletion) of low (high) pT particles, with a
transition around 3 GeV=c. This measurement shows for the first time the in-medium shower modifications
of partons (quark dominated) with well-defined initial kinematics. It constitutes a new well-controlled
reference for testing theoretical models of the parton passage through the quark-gluon plasma. |
| first_indexed | 2025-11-14T17:23:24Z |
| format | Article |
| id | iium-70737 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:23:24Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-707372019-07-15T01:09:24Z http://irep.iium.edu.my/70737/ Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics Measurements of fragmentation functions for jets associated with an isolated photon are presented for the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the CERN LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Fragmentation functions are obtained for jets with pjet T > 30 GeV=c in events containing an isolated photon with pγ T > 60 GeV=c, using charged tracks with transverse momentum ptrk T > 1 GeV=c in a cone around the jet axis. The association with an isolated photon constrains the initial pT and azimuthal angle of the parton whose shower produced the jet. For central Pb-Pb collisions, modifications of the jet fragmentation functions are observed when compared to those measured in pp collisions, while no significant differences are found in the 50% most peripheral collisions. Jets in central Pb-Pb events show an excess (depletion) of low (high) pT particles, with a transition around 3 GeV=c. This measurement shows for the first time the in-medium shower modifications of partons (quark dominated) with well-defined initial kinematics. It constitutes a new well-controlled reference for testing theoretical models of the parton passage through the quark-gluon plasma. American Physical Society 2018-12-14 Article PeerReviewed application/pdf en http://irep.iium.edu.my/70737/1/70737_Observation%20of%20Medium-Induced%20Modifications_article.pdf application/pdf en http://irep.iium.edu.my/70737/2/70737_Observation%20of%20Medium-Induced%20Modifications_scopus_new.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets. Physical Review Letters, 121 (24). pp. 1-18. ISSN 0031-9007 E-ISSN 1079-7114 https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.242301 10.1103/PhysRevLett.121.242301 |
| spellingShingle | Q Science (General) QC Physics Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title | Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title_full | Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title_fullStr | Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title_full_unstemmed | Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title_short | Observation of medium-induced modifications of Jet fragmentation in Pb-Pb collisions at sNN =5.02 TeV using isolated photon-tagged jets |
| title_sort | observation of medium-induced modifications of jet fragmentation in pb-pb collisions at snn =5.02 tev using isolated photon-tagged jets |
| topic | Q Science (General) QC Physics |
| url | http://irep.iium.edu.my/70737/ http://irep.iium.edu.my/70737/ http://irep.iium.edu.my/70737/ http://irep.iium.edu.my/70737/1/70737_Observation%20of%20Medium-Induced%20Modifications_article.pdf http://irep.iium.edu.my/70737/2/70737_Observation%20of%20Medium-Induced%20Modifications_scopus_new.pdf |