Abstract

Normalized double-differential cross sections for top quark pair (t t-bar) 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 t t-bar cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and t t-bar 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 t t-bar 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

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 $\Delta...
Table 16

Data from Table 16 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t12

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...
Table 17

Data from Table 17 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t13

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $M(t\bar{t})$ and $p_{T}(t\bar{t})$, along with their relative statistical and...
Table 18

Data from Table 18 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t14

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 $p_{T}(t\bar{t})$....
Table 19

Data from Table 19 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t15

Sources and values of the relative systematic uncertainties in percent of the measured normalized $t\bar{t}$ double-differential cross sections as a...
Table 20

Data from Table 20 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t16

The measured normalized $t\bar{t}$ double-differential cross sections in different bins of $M(t\bar{t})$ and $\Delta \phi(t, \bar{t})$, along with their relative...
Table 21

Data from Table 21 of preprint arXiv:1703.01630

10.17182/hepdata.77008.v1/t17

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 $\Delta...
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...

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