Measurement of the two-photon width of the. eta. and. eta. prime mesons

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.17· OSTI ID:6916457

Roe, N A; Bartha, G; Burke, D L; Garbincius, P; Hawkins, C A; Jonker, M J; Steele, T R ^[1]; Johnson, A S; Whitaker, J S; Wilson, R J ^[2]; Hearty, C; Rothberg, J E; Young, K K ^[3]; Hollebeek, R J ^[4]

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1. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (US)
2. Boston University, Boston, Massachusetts 02215 (USA)
3. University of Washington, Seattle, Washington 98195 (USA)
4. University of Pennsylvania, Philadelphia, Pennsylvania 19104 (USA)

Formation of the {eta} and {eta}{prime} mesons in two-photon interactions has been observed with the ASP detector at the SLAC {ital e}{sup +}e{sup {minus}} storage ring PEP ({radical}{ital s}=29 GeV). In a data sample of 108 pb{sup {minus}1}, a total of 2287 {eta} and 547 {eta}{prime} events have been detected in the {gamma}{gamma} decay mode. The two-photon widths are determined to be {Gamma}{sub {gamma}{gamma}}({eta})=0.490{plus minus}0.010{plus minus}0.048 keV and {Gamma}{sub {gamma}{gamma}}({eta}{prime})=4.96{plus minus}0.23{plus minus}0.72 keV. The SU(3) pseudoscalar mixing angle deduced from these values is {theta}{sub {ital p}}={minus}19.8 {degree}{plus minus}2.2 {degree}.

• DOE Contract Number: AC03-76SF00515; AC02-86ER40284; AC02-76ER03071
• OSTI ID: 6916457
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:1; ISSN 0556-2821; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ETA MESONS
ETA PRIME-958 MESONS
GEV RANGE
GEV RANGE 10-100
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIE GROUPS
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE WIDTHS
PEP STORAGE RINGS
PHOTON-PHOTON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
STORAGE RINGS
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS