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Title: Correlations in neutral strange particle pairs at HERA
Author: Robertson, Aileen Mary
ISNI:       0000 0004 2725 3497
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2011
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Correlations in pairs of neutral strange particles have been studied with the ZEDS detector at HERA, using 320 pb-1 of integrated luminosity from the HERA II period of running (2004-2007). The distributions in Q = JM;air - 4M~o and r.",p = JΔn2 + Δǿ2 were found for pairs of ΛΛ¯, ΛΛ+Λ¯Λ¯, ΛKs+ΛKs and KsKs particles as well as for the ratios ΛΛ/ΛΛ¯, ΛΛ/ KsKs and ΛΛ/ KsKs. The distributions were compared to a mixture of ARIADNE deep inelastic scattering (DIS) Monte Carlo and PYTHIA photoproduction MC and found to be in agreement. The ratios ΛΛ/ KsKs and ΛΛ/ KsKs were compared to the measured baryon-to-meson ratio for single particles. The ΛΛ/ KsKs ratio was found to be compatible with the product of single ratios which would apply if the particles were produced independently. The ΛΛ/ KsKs ratio was found to be larger than the value predicted from the single ratios. The Q and rήǿ distributions were also obtained for DIS and PHP enriched samples of ΛKs and KsKs pairs. The DIS distributions were found to agree with ARIADNE MC. The Q distributions were found to disagree with the shape of PYTHIA MC distributions, however the rήǿ distributions agreed with the MC. The rήǿ distributions were compared to the distance in 'r/

Supervisor: Walczak, Z. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available