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Measurement of double-differential cross sections for top quark pair production in pp collisions at sqrt(s) = 8 TeV and impact on parton distribution functions

The collaboration
No Journal Information, 2017

Abstract
Normalized double-differential cross sections for top quark pair (ttbar) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 inverse femtobarns. The measurement is performed in the dilepton e+/- mu-/+ final state. The ttbar cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and ttbar system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured ttbar cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.

• #### Table 5

Data from Table 5 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t1

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $y(t)$ and $p_{T}(t)$, along with their relative statistical and...

• #### Table 6

Data from Table 6 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t2

The correlation matrix of statistical uncertainties for the normalized $t\bar{t}$ double-differential cross sections as a function of $y(t)$ and $p_{T}(t)$....

• #### Table 7

Data from Table 7 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t3

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...

• #### Table 8

Data from Table 8 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t4

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $M(t\bar{t})$ and $y(t)$, along with their relative statistical and...

• #### Table 9

Data from Table 9 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t5

The correlation matrix of statistical uncertainties for the normalized $t\bar{t}$ double-differential cross sections as a function of $M(t\bar{t})$ and $y(t)$....

• #### Table 10

Data from Table 10 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t6

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...

• #### Table 11

Data from Table 11 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t7

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $M(t\bar{t})$ and $y(t\bar{t})$, along with their relative statistical and...

• #### Table 12

Data from Table 12 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t8

The correlation matrix of statistical uncertainties for the normalized $t\bar{t}$ double-differential cross sections as a function of $M(t\bar{t})$ and $y(t\bar{t})$....

• #### Table 13

Data from Table 13 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t9

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...

• #### Table 14

Data from Table 14 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t10

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $M(t\bar{t})$ and $\Delta \eta(t, \bar{t})$, along with their relative...

• #### Table 15

Data from Table 15 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t11

• #### Table 22

Data from Table 22 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t18

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...