Constraining gluon distributions in nuclei using dijets in proton-proton and proton-lead collisions at sNN =5.02 TeV
The pseudorapidity distributions of dijets as functions of their average transverse momentum (pave T ) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
American Physical Society
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/66765/ http://irep.iium.edu.my/66765/ http://irep.iium.edu.my/66765/ http://irep.iium.edu.my/66765/1/66765_Constraining%20Gluon%20Distributions%20in%20Nuclei%20Using_article.pdf http://irep.iium.edu.my/66765/2/66765_Constraining%20Gluon%20Distributions%20in%20Nuclei%20Using_scopus.pdf http://irep.iium.edu.my/66765/13/66765_Constraining%20Gluon%20Distributions%20in%20Nuclei%20Using%20Dijets%20in%20Proton-Proton%20and%20Proton-Lead%20Collisions%20at%20sNN%20%3D5.02%20TeV_WOS.pdf |
| Summary: | The pseudorapidity distributions of dijets as functions of their average transverse momentum (pave
T ) are
measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the
CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. A significant
modification of the pPb spectra with respect to the pp spectra is observed in all pave
T intervals investigated.
The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum
chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs).
These results give the first evidence that the gluon PDF at large Bjorken x in lead ions is strongly
suppressed with respect to the PDF in unbound nucleons. |
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