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- Del Valle, AE
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- Frühwirth, R
- Ghete, VM
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- Jeitler, M
- Krammer, N
- Krätschmer, I
- Liko, D
- Madlener, T
- Mikulec, I
- Rad, N
- Rohringer, H
- Schieck, J
- Schöfbeck, R
- Spanring, M
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- Waltenberger, W
- Wittmann, J
- Wulz, CE
- Zarucki, M
- Chekhovsky, V
- Mossolov, V
- Gonzalez, JS
- De Wolf, EA
- Di Croce, D
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- Pieters, M
- Van Haevermaet, H
- Van Mechelen, P
- Van Remortel, N
- Blekman, F
- D’Hondt, J
- De Clercq, J
- Deroover, K
- Flouris, G
- Lontkovskyi, D
- Lowette, S
- Marchesini, I
- Moortgat, S
- Moreels, L
- Python, Q
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- Tavernier, S
- Van Doninck, W
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- Van Parijs, I
- Beghin, D
- Bilin, B
- Brun, H
- Clerbaux, B
- De Lentdecker, G
- Delannoy, H
- Dorney, B
- Fasanella, G
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- Grebenyuk, A
- Kalsi, AK
- Luetic, J
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- Starling, E
- Thomas, L
- Velde, CV
- Vanlaer, P
- Vannerom, D
- Wang, Q
- Cornelis, T
- Dobur, D
- Fagot, A
- Gul, M
- Khvastunov, I
- Roskas, C
- Trocino, D
- Tytgat, M
- Verbeke, W
- Vermassen, B
- Vit, M
- Zaganidis, N
- Bondu, O
- Bruno, G
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- et al.
Normalised multi-differential cross sections for top quark pair (t t ¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9fb-1. The double-differential t t ¯ cross section is measured as a function of the kinematic properties of the top quark and of the t t ¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t t ¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength α and the top quark pole mass (mtpole) using several sets of parton distribution functions (PDFs). The measurement of mtpole exploits the sensitivity of the t t ¯ invariant mass distribution to mtpole near the production threshold. Furthermore, a simultaneous fit of the PDFs, α , and mtpole is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of α and mtpole. The values αS(mZ)=0.1135-0.0017+0.0021 and mtpole=170.5±0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t t ¯ production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of mtpole of the order of +1GeV, which can be regarded as additional theoretical uncertainty in the current mtpole extraction. S S S