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Measurement of $K_S^0$ and $\Lambda^0$ production in $t \bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s} =$ 7 TeV with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2019

Abstract
Measurements of $K_S^0$ and $\Lambda^0$ production in $t\bar{t}$ final states have been performed. They are based on a data sample with integrated luminosity of 4.6 $\mathrm{fb}^{-1}$ from proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron Collider. Neutral strange particles are separated into three classes, depending on whether they are contained in a jet, with or without a $b$-tag, or not associated with a selected jet. The aim is to look for differences in their main kinematic distributions. A comparison of data with several Monte Carlo simulations using different hadronisation and fragmentation schemes, colour reconnection models and different tunes for the underlying event has been made. The production of neutral strange particles in $t\bar{t}$ dileptonic events is found to be well described by current Monte Carlo models for $K_S^0$ and $\Lambda^0$ production within jets, but not for those produced outside jets.

  • Table 1

    Data from Figure 8A of the paper draft, and Table 13 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t1

    The transverse momentum ($p_{T}$) distribution for $K^{0}_{S}$ production inside $b$-jets for unfolded data to particle level, normalised to the total...

  • Table 2

    Data from Figure 8B of the paper draft

    10.17182/hepdata.91243.v1/t2

    The energy fraction ($x_{K}$) distribution for $K^{0}_{S}$ production inside $b$-jets for unfolded data to particle level, normalised to the total...

  • Table 3

    Data from Figure 8C of the paper draft

    10.17182/hepdata.91243.v1/t3

    The energy distribution for $K^{0}_{S}$ production inside $b$-jets for unfolded data to particle level, normalised to the total number of...

  • Table 4

    Data from Figure 8D of the paper draft, and Table 16 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t4

    The pseudorapidity ($|\eta|$) distribution for $K^{0}_{S}$ production inside $b$-jets for unfolded data to particle level, normalised to the total number...

  • Table 5

    Data from Figure 8E of the paper draft

    10.17182/hepdata.91243.v1/t5

    The multiplicity ($N_K$) distribution for $K^{0}_{S}$ production inside $b$-jets for unfolded data to particle level, including only visible decays ($K^0_S...

  • Table 6

    Data from Figure 9A of the paper draft, and Table 14 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t6

    The transverse momentum ($p_{T}$) distribution for $K^{0}_{S}$ production inside non $b$-jets for unfolded data to particle level, normalised to the...

  • Table 7

    Data from Figure 9B of the paper draft

    10.17182/hepdata.91243.v1/t7

    The energy fraction ($x_{K}$) distribution for $K^{0}_{S}$ production inside non $b$-jets for unfolded data to particle level, normalised to the...

  • Table 8

    Data from Figure 9C of the paper draft

    10.17182/hepdata.91243.v1/t8

    The energy distribution for $K^{0}_{S}$ production inside non $b$-jets for unfolded data to particle level, normalised to the total number...

  • Table 9

    Data from Figure 9D of the paper draft, and Table 17 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t9

    The pseudorapidity ($|\eta|$) distribution for $K^{0}_{S}$ production inside non $b$-jets for unfolded data to particle level, normalised to the total...

  • Table 10

    Data from Figure 9E of the paper draft

    10.17182/hepdata.91243.v1/t10

    The multiplicity ($N_K$) distribution for $K^{0}_{S}$ production inside non $b$-jets for unfolded data to particle level, including only visible decays...

  • Table 11

    Data from Figure 10A of the paper draft, and Table 12 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t11

    The transverse momentum ($p_{T}$) distribution for $K^{0}_{S}$ production not associated with jets for unfolded data to particle level, normalised to...

  • Table 12

    Data from Figure 10B of the paper draft

    10.17182/hepdata.91243.v1/t12

    The energy distribution for $K^{0}_{S}$ production not associated with jets for unfolded data to particle level, normalised to the total...

  • Table 13

    Data from Figure 10C of the paper draft, and Table 15 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t13

    The pseudorapidity ($|\eta|$) distribution for $K^{0}_{S}$ production not associated with jets for unfolded data to particle level, normalised to the...

  • Table 14

    Data from Figure 10D of the paper draft

    10.17182/hepdata.91243.v1/t14

    The multiplicity ($N_K$) distribution for $K^{0}_{S}$ production not associated with jets for unfolded data to particle level, including only visible...

  • Table 15

    Data from Figure 12A of the paper draft

    10.17182/hepdata.91243.v1/t15

    The transverse momentum ($p_{T}$) distribution for the total $K^{0}_{S}$ production for unfolded data to particle level, normalised to the total...

  • Table 16

    Data from Figure 12B of the paper draft

    10.17182/hepdata.91243.v1/t16

    The energy distribution for the total $K^{0}_{S}$ production for unfolded data to particle level, normalised to the total number of...

  • Table 17

    Data from Figure 12C of the paper draft

    10.17182/hepdata.91243.v1/t17

    The pseudorapidity ($|\eta|$) distribution for the total $K^{0}_{S}$ production for unfolded data to particle level, normalised to the total number...

  • Table 18

    Data from Figure 12D of the paper draft

    10.17182/hepdata.91243.v1/t18

    The multiplicity ($N_K$) distribution for the total $K^{0}_{S}$ production for unfolded data to particle level, including only visible decays ($K^0_S...

  • Table 19

    Data from Figure 11A of the paper draft, and Table 18 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t19

    The transverse momentum ($p_{T}$) distribution for the total $\Lambda$ production for unfolded data to particle level, normalised to the total...

  • Table 20

    Data from Figure 11B of the paper draft

    10.17182/hepdata.91243.v1/t20

    The energy distribution for the total $\Lambda$ production for unfolded data to particle level, normalised to the total number of...

  • Table 21

    Data from Figure 11C of the paper draft, and Table 19 of the Appendix of Numerical results

    10.17182/hepdata.91243.v1/t21

    The pseudorapidity ($|\eta|$) distribution for the total $\Lambda$ production for unfolded data to particle level, normalised to the total number...

  • Table 22

    Data from Table 6 of the paper draft

    10.17182/hepdata.91243.v1/t22

    $K^0_S$ and $\Lambda$ unfolded (particle-level) average multiplicities per event ($\langle n_{K,\Lambda}\rangle$), including statistical and systematic uncertainties, for each class and...

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