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Measurement of $\mathrm {t}\overline{\mathrm {t}}$ production with additional jet activity, including $\mathrm {b}$ quark jets, in the dilepton decay channel using pp collisions at $\sqrt{s} =$ 8 TeV

The collaboration
Eur.Phys.J.C 76 (2016) 379, 2016.

Abstract (data abstract)
Jet multiplicity distributions in top quark pair (ttbar) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7 inverse-femtobarns. The measurement is performed in the dilepton decay channels (e+ e-, mu+ mu-, and e+/- mu-/+). The absolute and normalized differential cross sections for t-tbar production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential t-tbar-b and t-tbar-b-bbar cross sections are presented for the first time as a function of the kinematic properties of the leading additional b jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation.

• #### Table 1

Data from Page 48 of preprint, table B.1, top 5 lines of table, jet multiplicity (ptjet>30 GeV)

10.17182/hepdata.70880.v1/t1

Absolute differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 30GeV, along with...

• #### Table 2

Data from Page 48 of preprint, table B.1, top 5 lines of table, jet multiplicity (ptjet>30 GeV)

10.17182/hepdata.70880.v1/t2

Normalized differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 30GeV, along with...

• #### Table 3

Data from Page 48 of preprint, table B.1, lines 6 to 11 of table, jet multiplicity (ptjet>60 GeV)

10.17182/hepdata.70880.v1/t3

Absolute differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 60GeV, along with...

• #### Table 4

Data from Page 48 of preprint, table B.1, lines 6 to 11 of table, jet multiplicity (ptjet>60 GeV)

10.17182/hepdata.70880.v1/t4

Normalized differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 60GeV, along with...

• #### Table 5

Data from Page 48 of preprint, table B.1, lines 12 to 16 of table, jet multiplicity (ptjet>100 GeV)

10.17182/hepdata.70880.v1/t5

Absolute differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 100GeV, along with...

• #### Table 6

Data from Page 48 of preprint, table B.1, lines 12 to 16 of table, jet multiplicity (ptjet>100 GeV)

10.17182/hepdata.70880.v1/t6

Normalized differential ttbar cross sections as a function of the jet multiplicity for jets with pt > 100GeV, along with...

• #### Table 7

Data from Page 49 of preprint, table B.2, top 5 lines of table,

10.17182/hepdata.70880.v1/t7

Absolute differential ttbar cross sections as a function of the pt of the leading additional jet in the event (not...

• #### Table 8

Data from Page 49 of preprint, table B.2, top 5 lines of table,

10.17182/hepdata.70880.v1/t8

Normalized differential ttbar cross sections as a function of the pt of the leading additional jet in the event (not...

• #### Table 9

Data from Page 49 of preprint, table B.2, lower 4 lines of table,

10.17182/hepdata.70880.v1/t9

Absolute differential ttbar cross sections as a function of the eta of the leading additional jet in the event (not...

• #### Table 10

Data from Page 49 of preprint, table B.2, lower 4 lines of table,

10.17182/hepdata.70880.v1/t10

Normalized differential ttbar cross sections as a function of the eta of the leading additional jet in the event (not...

• #### Table 11

Data from Page 49 of preprint, table B.3, top 5 lines of table,

10.17182/hepdata.70880.v1/t11

Absolute differential ttbar cross sections as a function of the pt of the subleading additional jet in the event (not...

• #### Table 12

Data from Page 49 of preprint, table B.3, top 5 lines of table,

10.17182/hepdata.70880.v1/t12

Normalized differential ttbar cross sections as a function of the pt of the subleading additional jet in the event (not...

• #### Table 13

Data from Page 49 of preprint, table B.3, lower 4 lines of table,

10.17182/hepdata.70880.v1/t13

Absolute differential ttbar cross sections as a function of |eta| of the subleading additional jet in the event (not coming...

• #### Table 14

Data from Page 49 of preprint, table B.3, lower 4 lines of table,

10.17182/hepdata.70880.v1/t14

Normalized differential ttbar cross sections as a function of |eta| of the subleading additional jet in the event (not coming...

• #### Table 15

Data from Page 50 of preprint, table B.4, top 4 lines of table,

10.17182/hepdata.70880.v1/t15

Absolute differential ttbar cross sections as a function of the invariant mass of the two leading additional jets in the...

• #### Table 16

Data from Page 50 of preprint, table B.4, top 4 lines of table,

10.17182/hepdata.70880.v1/t16

Normalized differential ttbar cross sections as a function of the invariant mass of the two leading additional jets in the...

• #### Table 17

Data from Page 50 of preprint, table B.4, lines 5 to 9 of table,

10.17182/hepdata.70880.v1/t17

Absolute differential ttbar cross sections as a function of the angle DeltaR between the two leading additional jets in the...

• #### Table 18

Data from Page 50 of preprint, table B.4, lines 5 to 9 of table,

10.17182/hepdata.70880.v1/t18

Normalized differential ttbar cross sections as a function of the angle DeltaR between the two leading additional jets in the...

• #### Table 19

Data from Page 50 of preprint, table B.4, lower 5 lines of table,

10.17182/hepdata.70880.v1/t19

Absolute differential ttbar cross sections as a function of the observable HT, along with their statistical and systematic uncertainties. The...

• #### Table 20

Data from Page 50 of preprint, table B.4, lower 5 lines of table,

10.17182/hepdata.70880.v1/t20

Normalized differential ttbar cross sections as a function of the observable HT, along with their statistical and systematic uncertainties. The...

• #### Table 21

Data from Page 51 of preprint, table B.5, top 5 lines of table,

10.17182/hepdata.70880.v1/t21

Absolute differential ttbar cross sections as a function of the pt of the leading additional jet j1 in the event...

• #### Table 22

Data from Page 51 of preprint, table B.5, top 5 lines of table,

10.17182/hepdata.70880.v1/t22

Normalized differential ttbar cross sections as a function of pt of the leading additional jet j1 in the event (not...

• #### Table 23

Data from Page 51 of preprint, table B.5, lower 4 lines of table,

10.17182/hepdata.70880.v1/t23

Absolute differential ttbar cross sections as a function of |eta| of the leading additional jet j1 in the event (not...

• #### Table 24

Data from Page 51 of preprint, table B.5, lower 4 lines of table,

10.17182/hepdata.70880.v1/t24

Normalized differential ttbar cross sections as a function of |eta| of the leading additional jet j1 in the event (not...

• #### Table 25

Data from Page 51 of preprint, table B.6, top 5 lines of table,

10.17182/hepdata.70880.v1/t25

Absolute differential ttbar cross sections as a function of the pt of the subleading additional jet j2 in the event...

• #### Table 26

Data from Page 51 of preprint, table B.6, top 5 lines of table,

10.17182/hepdata.70880.v1/t26

Normalized differential ttbar cross sections as a function of pt of the subleading additional jet j2 in the event (not...

• #### Table 27

Data from Page 51 of preprint, table B.6, lower 4 lines of table,

10.17182/hepdata.70880.v1/t27

Absolute differential ttbar cross sections as a function of |eta| of the subleading additional jet j2 in the event (not...

• #### Table 28

Data from Page 51 of preprint, table B.6, lower 4 lines of table,

10.17182/hepdata.70880.v1/t28

Normalized differential ttbar cross sections as a function of |eta| of the subleading additional jet j2 in the event (not...

• #### Table 29

Data from Page 52 of preprint, table B.7, top 4 lines of table,

10.17182/hepdata.70880.v1/t29

Absolute differential ttbar cross sections as a function of the invariant mass of the two leading additional jets in the...

• #### Table 30

Data from Page 52 of preprint, table B.7, top 4 lines of table,

10.17182/hepdata.70880.v1/t30

Normalized differential ttbar cross sections as a function of the invariant mass of the two leading additional jets in the...

• #### Table 31

Data from Page 52 of preprint, table B.7, lines 5 to 9 of table,

10.17182/hepdata.70880.v1/t31

Absolute differential ttbar cross sections as a function of the angle DeltaR between the two leading additional jets in the...

• #### Table 32

Data from Page 52 of preprint, table B.7, lines 5 to 9 of table,

10.17182/hepdata.70880.v1/t32

Normalized differential ttbar cross sections as a function of the angle DeltaR between the two leading additional jets in the...

• #### Table 33

Data from Page 52 of preprint, table B.7, lower 5 lines of table,

10.17182/hepdata.70880.v1/t33

Absolute differential ttbar cross sections as a function of the observable HT, along with their statistical and systematic uncertainties. The...

• #### Table 34

Data from Page 52 of preprint, table B.7, lower 5 lines of table,

10.17182/hepdata.70880.v1/t34

Normalized differential ttbar cross sections as a function of the observable HT, along with their statistical and systematic uncertainties. The...

• #### Table 35

Data from Page 53 of preprint, table B.8, top 4 lines of table,

10.17182/hepdata.70880.v1/t35

Absolute differential ttbar cross sections as a function of the pt of the leading additional b-jet b1 in the event...

• #### Table 36

Data from Page 53 of preprint, table B.8, top 4 lines of table,

10.17182/hepdata.70880.v1/t36

Normalized differential ttbar cross sections as a function of the pt of the leading additional b-jet b1 in the event...

• #### Table 37

Data from Page 53 of preprint, table B.8, lines 5-8 of table,

10.17182/hepdata.70880.v1/t37

Absolute differential ttbar cross sections as a function of |eta| of the leading additional b-jet b1 in the event (not...

• #### Table 38

Data from Page 53 of preprint, table B.8, lines 5-8 of table,

10.17182/hepdata.70880.v1/t38

Normalized differential ttbar cross sections as a function of |eta| of the leading additional b-jet b1 in the event (not...

• #### Table 39

Data from Page 53 of preprint, table B.8, lines 9-11 lines of table,

10.17182/hepdata.70880.v1/t39

Absolute differential ttbar cross sections as a function of the pt of the subleading additional b-jet b2 in the event...

• #### Table 40

Data from Page 53 of preprint, table B.8, lines 9-11 of table,

10.17182/hepdata.70880.v1/t40

Normalized differential ttbar cross sections as a function of the pt of the subleading additional b-jet b2 in the event...

• #### Table 41

Data from Page 53 of preprint, table B.8, lines 12-14 of table,

10.17182/hepdata.70880.v1/t41

Absolute differential ttbar cross sections as a function of |eta| of the leading additional b-jet b2 in the event (not...

• #### Table 42

Data from Page 53 of preprint, table B.8, lines 12-14 of table,

10.17182/hepdata.70880.v1/t42

Normalized differential ttbar cross sections as a function of |eta| of the leading additional b-jet b2 in the event (not...

• #### Table 43

Data from Page 54 of preprint, table B.9, top 4 lines of table,

10.17182/hepdata.70880.v1/t43

Absolute differential ttbar cross sections as a function of the invariant mass of the two leading additional b-jets in the...

• #### Table 44

Data from Page 54 of preprint, table B.9, top 4 lines of table,

10.17182/hepdata.70880.v1/t44

Normalized differential ttbar cross sections as a function of the invariant mass of the two leading additional b-jets in the...

• #### Table 45

Data from Page 54 of preprint, table B.9, lines 5 to 7 of table,

10.17182/hepdata.70880.v1/t45

Absolute differential ttbar cross sections as a function of the angle DeltaR between the two leading additional b-jets in the...

• #### Table 46

Data from Page 54 of preprint, table B.9, lines 5 to 7 of table,

10.17182/hepdata.70880.v1/t46

Normalized differential ttbar cross sections as a function of the angle DeltaR between the two leading additional b-jets in the...

• #### Table 47

Data from Page 55 of preprint, table B.10, top 4 lines of table,

10.17182/hepdata.70880.v1/t47

Absolute differential ttbar cross sections as a function of the pt of the leading additional b-jet b1 in the event...

• #### Table 48

Data from Page 55 of preprint, table B.10, top 4 lines of table,

10.17182/hepdata.70880.v1/t48

Normalized differential ttbar cross sections as a function of the pt of the leading additional b-jet b1 in the event...

• #### Table 49

Data from Page 55 of preprint, table B.10, lines 5-8 of table,

10.17182/hepdata.70880.v1/t49

Absolute differential ttbar cross sections as a function of |eta| of the leading additional b-jet b1 in the event (not...

• #### Table 50

Data from Page 55 of preprint, table B.10, lines 5-8 of table,

10.17182/hepdata.70880.v1/t50

Normalized differential ttbar cross sections as a function of |eta| of the leading additional b-jet b1 in the event (not...

• #### Table 51

Data from Page 55 of preprint, table B.10, lines 9-11 lines of table,

10.17182/hepdata.70880.v1/t51

Absolute differential ttbar cross sections as a function of the pt of the subleading additional b-jet b2 in the event...

• #### Table 52

Data from Page 55 of preprint, table B.10, lines 9-11 of table,

10.17182/hepdata.70880.v1/t52

Normalized differential ttbar cross sections as a function of the pt of the subleading additional b-jet b2 in the event...

• #### Table 53

Data from Page 55 of preprint, table B.10, lines 12-14 of table,

10.17182/hepdata.70880.v1/t53

Absolute differential ttbar cross sections as a function of |eta| of the leading additional b-jet b2 in the event (not...

• #### Table 54

Data from Page 55 of preprint, table B.10, lines 12-14 of table,

10.17182/hepdata.70880.v1/t54

Normalized differential ttbar cross sections as a function of |eta| of the leading additional b-jet b2 in the event (not...

• #### Table 55

Data from Page 56 of preprint, table B.11, top 4 lines of table,

10.17182/hepdata.70880.v1/t55

Absolute differential ttbar cross sections as a function of the invariant mass of the two leading additional b-jets in the...

• #### Table 56

Data from Page 56 of preprint, table B.11, top 4 lines of table,

10.17182/hepdata.70880.v1/t56

Normalized differential ttbar cross sections as a function of the invariant mass of the two leading additional b-jets in the...

• #### Table 57

Data from Page 56 of preprint, table B.11, lines 5 to 7 of table,

10.17182/hepdata.70880.v1/t57

Absolute differential ttbar cross sections as a function of the angle DeltaR between the two leading additional b-jets in the...

• #### Table 58

Data from Page 56 of preprint, table B.11, lines 5 to 7 of table,

10.17182/hepdata.70880.v1/t58

Normalized differential ttbar cross sections as a function of the angle DeltaR between the two leading additional b-jets in the...

• #### Table 59

Data from Additional Table, Figures 19 and 20 of preprint

10.17182/hepdata.70880.v1/t59

Gap fraction $f(p_T^{\rm jet})$ as function of leading additional jet transverse momentum $p_T^{\rm jet}$.

• #### Table 60

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t60

Gap fraction $f(p_T^{\rm jet})$ as function of leading additional jet transverse momentum $p_T^{\rm jet}$ in the region $|\eta|<0.8$.

• #### Table 61

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t61

Gap fraction $f(p_T^{\rm jet})$ as function of leading additional jet transverse momentum $p_T^{\rm jet}$ in the region $0.8<|\eta|<1.5$.

• #### Table 62

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t62

Gap fraction $f(p_T^{\rm jet})$ as function of leading additional jet transverse momentum $p_T^{\rm jet}$ in the region $1.5<|\eta|<2.4$.

• #### Table 63

Data from Additional Table, Figures 19 and 20 of preprint

10.17182/hepdata.70880.v1/t63

Gap fraction $f(p_T^{\rm jet_2})$ as function of subleading additional jet transverse momentum $p_T^{\rm jet_2}$.

• #### Table 64

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t64

Gap fraction $f(p_T^{\rm jet_2})$ as function of subleading additional jet transverse momentum $p_T^{\rm jet_2}$ in the region $|\eta|<0.8$.

• #### Table 65

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t65

Gap fraction $f(p_T^{\rm jet_2})$ as function of subleading additional jet transverse momentum $p_T^{\rm jet_2}$ in the region $0.8<|\eta|<1.5$.

• #### Table 66

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t66

Gap fraction $f(p_T^{\rm jet_2})$ as function of subleading additional jet transverse momentum $p_T^{\rm jet_2}$ in the region $1.5<|\eta|<2.4$.

• #### Table 67

Data from Additional Table, Figures 19 and 20 of preprint

10.17182/hepdata.70880.v1/t67

Gap fraction $f(H_T)$ as function of $H_T$.

• #### Table 68

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t68

Gap fraction $f(H_T)$ as function of $H_T$ in the region $|\eta|<0.8$.

• #### Table 69

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t69

Gap fraction $f(H_T)$ as function of $H_T$ in the region $0.8<|\eta|<1.5$.

• #### Table 70

Data from Additional Table, Figure 21 of preprint

10.17182/hepdata.70880.v1/t70

Gap fraction $f(H_T)$ as function of $H_T$ in the region $1.5<|\eta|<2.4$.

• #### Table 71

10.17182/hepdata.70880.v1/t71

Statistical covariance matrix for the absolute differential cross-section as a function of the number of jets with pt>30 GeV (see...

• #### Table 72

10.17182/hepdata.70880.v1/t72

Statistical covariance matrix for the normalized differential cross-section as a function of the number of jets with pt>30 GeV.

• #### Table 73

10.17182/hepdata.70880.v1/t73

Statistical covariance matrix for the absolute differential cross-section as a function of the number of jets with pt>60 GeV (see...

• #### Table 74

10.17182/hepdata.70880.v1/t74

Statistical covariance matrix for the normalized differential cross-section as a function of the number of jets with pt>60 GeV.

• #### Table 75

10.17182/hepdata.70880.v1/t75

Statistical covariance matrix for the absolute differential cross-section as a function of the number of jets with pt>100 GeV (see...

• #### Table 76

10.17182/hepdata.70880.v1/t76

Statistical covariance matrix for the normalized differential cross-section as a function of the number of jets with pt>100 GeV.