Home > Publications database > Measurement and phenomenology of azimuthal correlations in high transverse momentum multi-jet topologies in CMS at the center-of-mass energy of 13 TeV > print

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024 7 _ |a 10.3204/PUBDB-2019-02858
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088 1 _ |a DESY-THESIS-2019-013
088 _ _ |a DESY-THESIS-2019-013
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100 1 _ |a Bermudez Martinez, Armando
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245 _ _ |a Measurement and phenomenology of azimuthal correlations in high transverse momentum multi-jet topologies in CMS at the center-of-mass energy of 13 TeV
|f 2016-01-08 - 2019-03-07
260 _ _ |a Hamburg
|c 2019
|b Verlag Deutsches Elektronen-Synchrotron
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502 _ _ |a Dissertation, Universität Hamburg, 2019
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|o 2019-06-21
520 _ _ |a This work addresses the measurements and phenomenology of the azimuthal separation $\Delta\phi_{12}$ between the jets with the largest transverse momenta $(p_T)$ in multi-jet event topologies. The measurements are based on proton-proton collision data at the center-of-mass energy of 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment in 2016, and correspond to an integrated luminosity of 35.9 fb$^{−1}$. The measurements are performed in ranges of the leading jet transverse momentum $(p^{max}_{T})$, covering the range $p^{max}_{T} >$ 200 GeV. Special attention is given to the investigation of the Sudakov region 170° $< \Delta \phi_{12} <$ 180° in inclusive 2- and 3-jet event topologies. This region characterizes nearly back-to-back jet topologies and is sensitive to contributions from soft partonic radiation. The observables are compared to theoretical predictions based on matrix element (ME) calculation at leading- and next-to-leading-order accuracy in perturbative quantum chromodynamics (pQCD) combined with parton showers (PS). Discrepancies of up to 15% are observed for $\Delta \phi_{12} <$ 177°. The measurements are complemented with a wide phenomenological investigation of the PS impact and its subsequent combination with the ME calculation on the $\Delta \phi_{12}$ distribution. The measurements of $\Delta \phi_{12}$ in nearly back-to-back jet topologies for inclusive 2- and 3-jet events are not simultaneously described by any of the theoretical models. Predictions using ME and PS at different accuracies in pQCD provide a similar description of the data.
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700 1 _ |a Jung, Hannes
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700 1 _ |a Gallo-Voss, Elisabetta
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