Strangeness production in minimum bias and jet data

Abstract

For the first time, the KS production inside jets originating from 1.8 TeV Tevatron proton-antiproton collisions is researched utilizing the CDF data at Fermilab. Prior to the study of KS production inside jets, the KS production in the Minimum Bias events is examined. The properties of KS production, such as the values of , $\left(\frac{dN_{KS}}{dη}\right)$, lifetime, and invariant cross-section, are found to be consistent with other Minimum Bias publications. After this, the number of KS and tracks inside 0.7 jet cones are computed along with the trigger, background, and efficiency corrections for both the data and the HERWIG+QFL (event generator + detector simulator) Monte Carlo. Furthermore, the fragmentation functions are contrasted with those from the e+e- machines. In the data, the number of KS per jet increases and then reaches a plateau as a function of the jet ET. In particular, the number of KS per jet within 1.5 < pT < 10.0 GeV is determined to be 0.156 ± 0.007, 0.206 ± 0.011, and 0.199 ± 0.011 for the 20–50 GeV, 50–100 GeV, and 100–150 GeV jets. Conversely, the number of tracks per jet in the data strictly grows with the jet ET, and its values within 1.5 < pT < 10.0 GeV are 2.816 ± 0.008, 5.107 ± 0.009, and 5.972 ± 0.008 for the 20–50 GeV, 50–100 GeV, and 100–150 GeV cases. These data results are then compared with those from the HERWIG+QFL Monte Carlo. The Herwig+QFL Monte Carlo results are in agreement to within 10% as to the number of tracks per jet. Moreover, the number of KS per jet, the data and the Monte Carlo agree to within 5% for the 20–50 GeV case. However, the HERWIG+QFL Monte Carlo KS per jet values are increasingly above those of the data for KS inside the 50–100 GeV jets (around 20% too high) and 100–150 GeV jets (approximately 35% too high). We conclude that the HERWIG generates far too many KS inside jets at these higher energy jets. Finally, the fragmentation function is contrasted with equivalently computed quantities from e+ e- machines, and the results from the Tevatron are below those from e+e- machines for all measured jet ET ranges.