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Inclusive Jet cross section and strong coupling constant measurements at CMS
The probes which are abundantly produced in high energetic proton-proton ($pp$) collisions at the LHC are called jets. Events with jets can be described by Quantum Chromodynamics (QCD) in terms of parton-parton scattering. The inclusive jet cross section in $pp$ collision is the fundamental quantity...
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Lenguaje: | eng |
Publicado: |
2015
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1063/1.4944157 http://cds.cern.ch/record/2104208 |
Sumario: | The probes which are abundantly produced in high energetic proton-proton ($pp$) collisions at the LHC are called jets. Events with jets can be described by Quantum Chromodynamics (QCD) in terms of parton-parton scattering. The inclusive jet cross section in $pp$ collision is the fundamental quantity which can be measured and predicted within the framework of perturbative QCD (pQCD). The strong coupling constant $\alpha_\mathrm{S }$ which can be determined empirically in the limit of massless quarks, is the single parameter in QCD. The jet measurements can also be used to determine strong coupling constant $\alpha_\mathrm{S}$ and parton density functions (PDFs). The recent jet measurements which are performed with the data collected by the CMS detector at different center-of-mass energies and down to very low transverse momentum $p_T$ are presented. The measurements are compared to Monte Carlo predictions and perturbative calculations up to next-to-next-to leading order. Finally, the precision jet measurements give further insight into the QCD dynamics. |
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