Strange meson spectroscopy in Kω and KΦ at 11 GeV/c and Cherenkov ring imaging at SLD

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1993

DOI:https://doi.org/10.2172/10155433· OSTI ID:10155433

Kwon, Youngjoon ^[1]

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1. Stanford Univ., CA (United States)

This thesis consists of two independent parts; development of Cherenkov Ring Imaging Detector (CRID) system and analysis of high-statistics data of strange meson reactions from the LASS spectrometer. Part 1: The CRID system is devoted to charged particle identification in the SLAC Large Detector (SLD) to study e⁺e^- collisions at √s = m_Z⁰. By measuring the angles of emission of the Cherenkov photons inside liquid and gaseous radiators, {pi}/K/p separation will be achieved up to ~30 GeV/c. The signals from CRID are read in three coordinates, one of which is measured by charge-division technique. To obtain a ~1% spatial resolution in the charge-division, low-noise CRID preamplifier prototypes were developed and tested resulting in <1000 electrons noise for an average photoelectron signal with 2 x 10⁵ gain. To help ensure the long-term stability of CRID operation at high efficiency, a comprehensive monitoring and control system was developed. Part 2: Results from the partial wave analysis of strange meson final states in the reactions K^-p → K^-ωp and K^-p → $$\bar{K}$$⁰Φn are presented. The analyses are based on data from a 4.1 event/nb exposure of the LASS spectrometer in K^-p interactions at 11 GeV/c. The data sample of K^-ωp final state contains {approximately}10⁵ events. From the partial wave analysis, resonance structures of J^P= 2^-, 3^- and 2⁺ amplitudes are observed in the Kω system. The analysis of 2^- amplitudes provides an evidence for two strange meson states in the mass region around 1.75 GeV/c². The appropriate branching fractions are calculated and compared with the SU(3) predictions. The partial wave analysis of $$\bar{K}$$⁰Φ system favors J^P = 1^- and 2⁺ states in the 1.9--2.0 GeV/c² region.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 10155433
• Report Number(s): SLAC-409; ON: DE93013593; TRN: 93:001310
• Resource Relation: Other Information: TH: Thesis (Ph.D.); PBD: Jan 1993
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
43 PARTICLE ACCELERATORS
STANFORD LINEAR COLLIDER DETECTOR
PARTICLE IDENTIFICATION
CHERENKOV COUNTERS
DESIGN
PERFORMANCE TESTING
KAON MINUS-PROTON INTERACTIONS
MESON SPECTROSCOPY
STRANGE MESONS
PARTIAL WAVES
DATA ANALYSIS
MESON REACTIONS
ELECTRON-POSITRON INTERACTIONS
K 2-1430 MESONS
K 3-1780 MESONS
KAONS MINUS
KAONS NEUTRAL
PROTONS
662340
430303
HADRON INTERACTIONS
EXPERIMENTAL FACILITIES AND EQUIPMENT