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dc.contributor.authorCMS Collaborationen_US
dc.contributor.authorSirunyan, A. M.en_US
dc.contributor.authorSAHOO, N.en_US
dc.contributor.authorCHAUHAN , S.en_US
dc.contributor.authorDUBE, SOURABHen_US
dc.contributor.authorHEGDE, V.en_US
dc.contributor.authorKAPOOR, A.en_US
dc.contributor.authorKOTHEKAR, K.en_US
dc.contributor.authorPANDEY, S.en_US
dc.contributor.authorRANE, A.en_US
dc.contributor.authorRASTOGI, A. et al.en_US
dc.date.accessioned2020-12-04T11:39:56Z
dc.date.available2020-12-04T11:39:56Z
dc.date.issued2020-07en_US
dc.identifier.citationEuropean Physical Journal C, 80(7).en_US
dc.identifier.issn1434-6044en_US
dc.identifier.issn1434-6052en_US
dc.identifier.urihttp://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/5403-
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-020-7917-7en_US
dc.description.abstractNormalised multi-differential cross sections for top quark pair (t¯t) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV 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 35.9 fb−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 αS and the top quark pole mass (mpole t ) using several sets of parton distribution functions (PDFs). The measurement of mpole t exploits the sensitivity of the t¯t invariant mass distribution to mpole t near the production threshold. Furthermore, a simultaneous fit of the PDFs, αS, and mpole t 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 αS and mpole t . The values αS(mZ) = 0.1135+0.0021 −0.0017 and mpole t = 170.5 ± 0.8 GeV 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 mpole t of the order of +1 GeV, which can be regarded as additional theoretical uncertainty in the current mpole t extractionen_US
dc.language.isoenen_US
dc.publisherSpringer Natureen_US
dc.subject3-Loop Splitting Functionsen_US
dc.subjectPlus Plusen_US
dc.subjectQCDen_US
dc.subjectDensitiesen_US
dc.subjectEvolutionen_US
dc.subject2020en_US
dc.titleMeasurement of t¯t normalised multi-differential cross sections in pp collisions at √s = 13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functionsen_US
dc.typeArticleen_US
dc.contributor.departmentDept. of Physicsen_US
dc.identifier.sourcetitleEuropean Physical Journal Cen_US
dc.publication.originofpublisherForeignen_US
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