Measurement of the matrix elements for the decays η →π+π-π0 and η/η′ →π0π0π0 /M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

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Другой Автор
Ablikim, M.
Ai, X. C.
Chelkov, G. A.
Achasov, M. N.
Источник
Physical Review D 2015 Vol. 92, № 1. P. 012014-1-012014-11
Аннотация
Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π−π0 events, 33,908 η→π0π0π0 events, and 1,888 η′→π0π0π0 events are performed. The measured matrix elements of η→π+π−π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 are determined to be −0.055±0.014±0.004 and −0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.
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$a Measurement of the matrix elements for the decays η →π+π-π0 and η/η′ →π0π0π0 $c M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]
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$a Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π−π0 events, 33,908 η→π0π0π0 events, and 1,888 η′→π0π0π0 events are performed. The measured matrix elements of η→π+π−π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 are determined to be −0.055±0.014±0.004 and −0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.
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$a BESIII, детектор
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$a BEPCII, коллайдер
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$a статьи в журналах
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$a Ablikim, M.
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$a Chelkov, G. A.
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$a Achasov, M. N.
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$a Томский государственный университет $b Радиофизический факультет $b Научные подразделения РФФ
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$t Physical Review D $d 2015 $g Vol. 92, № 1. P. 012014-1-012014-11 $x 1550-7998
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Предмет
статьи в журналах
Резюме
Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π−π0 events, 33,908 η→π0π0π0 events, and 1,888 η′→π0π0π0 events are performed. The measured matrix elements of η→π+π−π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 are determined to be −0.055±0.014±0.004 and −0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.