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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 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

• #### 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...