Measurement of the top-quark mass in tt¯ + 1-jet events collected with the ATLAS detector in pp collisions at √s = 8 TeV
A determination of the top-quark mass is presented using 20.2 fb⁻¹ of 8 TeV proton-proton collision data produced by the Large Hadron Collider and collected by the ATLAS experiment. The normalised differential cross section of top-quark pair production in association with an energetic jet is measure...
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| Autores principales: | , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2019
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124610 |
| Aporte de: |
| Sumario: | A determination of the top-quark mass is presented using 20.2 fb⁻¹ of 8 TeV proton-proton collision data produced by the Large Hadron Collider and collected by the ATLAS experiment. The normalised differential cross section of top-quark pair production in association with an energetic jet is measured in the lepton+jets final state and unfolded to parton and particle levels. The unfolded distribution at parton level can be described using next-to-leading-order QCD predictions in terms of either the top-quark pole mass or the running mass as defined in the (modified) minimal subtraction scheme. A comparison between the experimental distribution and the theoretical prediction allows the top-quark mass to be extracted in the two schemes. The value obtained for the pole-mass scheme is:
m<sup>pole</sup><sub>t</sub> = 171.1 ± 0.4 (stat) ± 0.9 (syst) <sup>+0.7</sup> <sub>−0.3</sub> (theo) GeV.
The extracted value in the running-mass scheme is:
m<sub>t</sub>(m<sub>t</sub>) = 162.9 ± 0.5 (stat) ± 1.0 (syst) <sup>+2.1</sup> <sub>−1.2</sub> (theo) GeV.
The results for the top-quark mass using the two schemes are consistent, when translated from one scheme to the other. |
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