Measurement of charge asymmetry braking by the comparison of pi+d --> pp eta with pi-d --> nn eta

pp eta with pi-d --> nn eta -->
Autoři: Abaev, V., Batinić, Mijo, Bekrenev, V., Briscoe, W.J., Chrien, 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.
Rok vydání: 2001
Témata: pion-deuteron interactions, eta mesons, meson production, C invariance, spontaneous symmetry breaking, isotopic spin, High Energy Physics::Experiment, Nuclear Experiment
Popis: We report a measurement of charge symmetry breaking in the NNeta system. We have measured the ratio of the differential cross sections of the charge-symmetric reactions pi+d-->ppeta and pi–d-->nneta in the energy region of the eta threshold. Our result is R[equivalent]dsigma(pi+d-->ppeta)/dsigma(pi–d-->nneta) = 0.938ą0.009 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 pi0-eta mixing. A theoretical model for eta production which includes pi0-eta mixing was used to fit the data and yields a mixing angle of (1.5ą0.4)°. 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 [approximate]1° and another which yields [approximate]2°.
Jazyk: English
Přístupová URL adresa: https://explore.openaire.eu/search/publication?articleId=57a035e5b1ae::c27e4db18dbd779f09b62f0d8c6c6d6b
https://www.bib.irb.hr/74559
Rights: CLOSED
Přírůstkové číslo: edsair.57a035e5b1ae..c27e4db18dbd779f09b62f0d8c6c6d6b
Autor: Abaev, V., Batinić, Mijo, Bekrenev, V., Briscoe, W.J., Chrien, 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:
Popis: We report a measurement of charge symmetry breaking in the NNeta system. We have measured the ratio of the differential cross sections of the charge-symmetric reactions pi+d-->ppeta and pi–d-->nneta in the energy region of the eta threshold. Our result is R[equivalent]dsigma(pi+d-->ppeta)/dsigma(pi–d-->nneta) = 0.938ą0.009 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 pi0-eta mixing. A theoretical model for eta production which includes pi0-eta mixing was used to fit the data and yields a mixing angle of (1.5ą0.4)°. 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 [approximate]1° and another which yields [approximate]2°.
Databáze: OpenAIRE
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