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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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Detalles Bibliográficos
Autor principal: Cerci, Salim
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1063/1.4944157
http://cds.cern.ch/record/2104208
Descripción
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.