Search for primarily non-interacting decay modes of the upsilon Metadata

Title

• Main Title Search for primarily non-interacting decay modes of the upsilon

Creator

• Author: Leffler, J.S.
  Creator Type: Personal

Publisher

• Name: Stanford Linear Accelerator Center
  Place of Publication: Menlo Park, California

Date

• Creation: 1986-03-01

Language

• English

Description

• Content Description: The hadronic transition UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S) is utilized to search for the reactions: UPSILON(1S) ..-->.. non-interacting particles and UPSILON(1S) ..-->.. ..gamma.. + non-interacting particles. 44 pb/sup -1/ of UPSILON(2S) data were taken by the Crystal Ball detector at the DORIS II storage ring in order to perform this study. An upper limit of BR(UPSILON ..-->.. Unseen) < 12% (90% C.L.), is obtained via this approach. The second process investigated involved the radiative decay of the Upsilon into non-interacting particles. 57 pb/sup -1/ of UPSILON(2S) data was available for this study. An upper limit on the branching ratio BR(UPSILON ..-->.. ..gamma.. + Unseen) is measured for photon energies in the range 500 MeV < E..gamma.. < M/sub ..gamma..//2. This is the first reported measurement of this type. For the highest energy photons, an upper limit of BR(UPSILON ..-->.. ..gamma.. + Unseen) < 2.3 x 10/sup -3/ (90% C.L.), is obtained. The compact size of the Crystal Ball detector enhances the observable branching ratio for noninteracting particles with short lifetimes such as massive axions. The identification of the recent Darmstadt events with a 1.6 MeV axion is excluded by the present result assuming the minimal Peccei-Quinn model. Limits on the spontaneous supersymmetry breaking mass scale are also derived as a function of gravitino mass.
• Physical Description: Pages: 148

Subject

• Keyword: Radiation Detectors
• Keyword: Scatterplots
• Keyword: Storage Rings
• Keyword: Pions
• Keyword: Pions Neutral
• Keyword: Data
• Keyword: Solid Scintillation Detectors
• Keyword: Scintillation Counters
• Keyword: Spectra
• Keyword: Symmetry 645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
• Keyword: Hadrons
• Keyword: Missing-Mass Spectra
• Keyword: Branching Ratio
• Keyword: Distribution
• STI Subject Categories: 645101 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
• Keyword: Upsilon-9500 Resonances
• Keyword: Particle Decay
• Keyword: Elementary Particles
• Keyword: Pseudoscalar Mesons
• Keyword: Experimental Data
• STI Subject Categories: 72 Physics Of Elementary Particles And Fields
• Keyword: Numerical Data
• Keyword: Mesons
• Keyword: Symmetry Breaking
• Keyword: Decay
• Keyword: Angular Distribution
• Keyword: Information
• Keyword: Energy Spectra
• Keyword: Upsilon-10000 Resonances
• Keyword: Doris Storage Ring
• Keyword: Measuring Instruments
• Keyword: Nai Detectors
• Keyword: Bosons
• Keyword: Radiative Decay
• Keyword: Supersymmetry
• Keyword: Diagrams

Source

• Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted. Thesis

Collection

• Name: Office of Scientific & Technical Information Technical Reports
  Code: OSTI

Institution

• Name: UNT Libraries Government Documents Department
  Code: UNTGD

Resource Type

• Report

Format

• Text

Identifier

• Other: DE86009733
• Report No.: SLAC-293
• Grant Number: AC03-76SF00515
• DOI: 10.2172/5937235
• Office of Scientific & Technical Information Report Number: 5937235
• Archival Resource Key: ark:/67531/metadc1100423

Note

• Display Note: NTIS, PC A07/MF A01; 1.