| Autor: |
Tippens, W.B., Abaev, V., Batinić, Mijo, Bekrenev, V., Briscoe, W.J., Chiren, R.E., Clajus, M., Isenhower, D., Kozlenko, N., Kruglov, S., Leitch, M.J., Marušić, Aljoša, Moriwaki, T., Morrison, T., Nefkens, B.M.K., Peng, J.C., Pile, P.H., Price, J.W., Rigsby, D., Sadler, M.E., Sawafta, R., Šlaus, Ivo, Seyfarth, H., Starostin, A., Supek, Ivan, Sutter, R.J., Švarc, Alfred, White, D.B. |
| Jazyk: |
angličtina |
| Rok vydání: |
2001 |
| Předmět: |
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| DOI: |
10.1103/physrevd.63.052001 |
| Popis: |
We report a measurement of charge symmetry breaking in the NN Eta system. We have measured the ratio of the differential cross sections of the charge-symmetric reactions Pi^+d->p p Eta with Pi^-d->n n Eta in the energy region of the Eta threshold. Our result is R=d Sigma(Pi^+d->ppEta)/d Sigma(Pi^-d->nn Eta)=0.938+-0.009 after a phase-space correction is made for the difference in the threshold energies of the two reactions. The deviation of R from unity is an indication of charge symmetry breaking, which is mostly due to Pi^0 - Eta mixing. A theoretical model for Eta production which includes Pi^0 - Eta mixing was used to fit the data and yields a mixing angle of (1.5+-0.4)^o. Our result is consistent with the mixing angle determined in particle decay and isospin-forbidden processes as well as predictions by several theoretical analyses which yield ~ 1^o and another which yields ~ 2^o. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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