Measurement of the two-photon width of the. eta. prime (958)

Using 203 pb{sup {minus}1} of data collected by the Mark II detector at the SLAC storage ring PEP, we have measured the radiative width of the {eta}{prime} for quasireal photons. The width is separately measured in the three reactions {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital...

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Veröffentlicht in:	Physical review. D, Particles and fields Particles and fields, 1990-09, Vol.42:5
Hauptverfasser:	Butler, F., Boyer, J., Gidal, G., Abrams, G., Amidei, D., Baden, A.R., Gold, M.S., Goldhaber, G., Golding, L., Haggerty, J., Herrup, D., Juricic, I., Kadyk, J.A., Levi, M.E., Nelson, M.E., Rowson, P.C., Schellman, H., Schmidke, W.B., Sheldon, P.D., Trilling, G.H., Wood, D.R., Riles, K., Perl, M.L., Barklow, T., Boyarski, A., Burchat, P.R., Burke, D.L., Dorfan, J.M., Feldman, G.J., Gladney, L., Hanson, G., Hayes, K., Hollebeek, R.J., Innes, W.R., Jaros, J.A., Karlen, D., Klein, S.R., Lankford, A.J., Larsen, R.R., LeClaire, B.W., Lockyer, N.S., Lueth, V., Ong, R.A., Richter, B., Yelton, J.M., Schaad, T.
Format:	Artikel
Sprache:	eng
Schlagworte:	645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties A2-1320 MESONS ANNIHILATION BASIC INTERACTIONS BOSONS ELECTROMAGNETIC INTERACTIONS ELECTRON-POSITRON INTERACTIONS ELEMENTARY PARTICLES ETA MESONS ETA PRIME-958 MESONS HADRONS INTERACTIONS LEPTON-LEPTON INTERACTIONS MESONS MONTE CARLO METHOD PARTICLE INTERACTIONS PARTICLE PROPERTIES PARTICLE WIDTHS PEP STORAGE RINGS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PIONS MINUS PIONS NEUTRAL PIONS PLUS PSEUDOSCALAR MESONS RADIATIVE DECAY RHO-770 MESONS STORAGE RINGS TENSOR MESONS TIME-OF-FLIGHT METHOD VECTOR MESONS
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Zusammenfassung:	Using 203 pb{sup {minus}1} of data collected by the Mark II detector at the SLAC storage ring PEP, we have measured the radiative width of the {eta}{prime} for quasireal photons. The width is separately measured in the three reactions {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{eta}{sup 0}{pi}{sup +}{pi}{sup {minus}}, {eta}{sup 0}{r arrow}{gamma}{gamma}; {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{eta}{sup 0}{pi}{sup +}{pi}{sup {minus}}; {eta}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}}({pi}{sup 0},{gamma}); and {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{rho}{sup 0}{gamma}, giving a statistically weighted average two-photon width of {Gamma}{sub {eta}{prime}{r arrow}{gamma}{gamma}}=4.57{plus minus}0.25{plus minus}0.44 keV. As a byproduct of the study of the decay mode {eta}{prime}{r arrow}{rho}{gamma}, we also measured the two-photon decay width of the {ital a}{sub 2}(1320) as {Gamma}{sub {ital a}2}(1320){r arrow}{gamma}{gamma}=1.03{plus minus}0.13{plus minus}0.21 keV.
ISSN:	0556-2821 1089-4918
DOI:	10.1103/PhysRevD.42.1368