Using 106 x 10(6) psi' decays collected with the BESIII detector at the BEPCII, three decays of chi(cJ) (J = 0, 1, 2) with baryon pairs (Lambda(Lambda) over bar, Sigma(0)(Sigma) over bar (0),Sigma(+)(Sigma) over bar (-)) in the final state have been studied. The branching fractions are measured to be B(chi(c0,1,2) -> Lambda(Lambda) over bar) = (33.3 +/- 2.0 +/- 2.6) x 10(-5), (12.2 +/- 1.1 +/- 1.1) x 10(-5), (20.8 +/- 1.6 +/- 2.3) x 10(-5), B(chi(c0,1,2) -> Sigma(0)(Sigma) over bar (0)) = (47.8 +/- 3.4 +/- 3.9) x 10(-5), (3.8 +/- 1.0 +/- 0.5) x 10(-5), (4.0 +/- 1.1 +/- 0.5) x 10(-5), and B(chi(c0,1,2) -> Sigma(+)(Sigma) over bar (-)) = (45.4 +/- 4.2 +/- 3.0) x 10(-5), (5.4 +/- 1.5 +/- 0.5) x 10(-5), (4.9 +/- 1.9 +/- 0.7) x 10(-5), where the first error is statistical and the second is systematic. Upper limits on the branching fractions for the decays of chi(c1,2) -> Sigma(0)(Sigma) over bar (0), Sigma(+)(Sigma) over bar (-) are estimated to be B(chi(c1) -> Sigma(0)(Sigma) over bar (0)) 6.2 x 10(-5), B(chi(c2) -> Sigma(0)<(Sigma) over bar (0)) 6.5 x 10(-5), B(chi(c1) -> Sigma(+)<(Sigma) over bar (-)) 8.7 x 10(-5) and B(chi(c2) -> Sigma(+)<(Sigma) over bar (-)) < 8.8 x 10(-5) at the 90% confidence level.

Measurements of baryon pair decays of χ_{cJ} mesons

DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2013-01-01

Abstract

Using 106 x 10(6) psi' decays collected with the BESIII detector at the BEPCII, three decays of chi(cJ) (J = 0, 1, 2) with baryon pairs (Lambda(Lambda) over bar, Sigma(0)(Sigma) over bar (0),Sigma(+)(Sigma) over bar (-)) in the final state have been studied. The branching fractions are measured to be B(chi(c0,1,2) -> Lambda(Lambda) over bar) = (33.3 +/- 2.0 +/- 2.6) x 10(-5), (12.2 +/- 1.1 +/- 1.1) x 10(-5), (20.8 +/- 1.6 +/- 2.3) x 10(-5), B(chi(c0,1,2) -> Sigma(0)(Sigma) over bar (0)) = (47.8 +/- 3.4 +/- 3.9) x 10(-5), (3.8 +/- 1.0 +/- 0.5) x 10(-5), (4.0 +/- 1.1 +/- 0.5) x 10(-5), and B(chi(c0,1,2) -> Sigma(+)(Sigma) over bar (-)) = (45.4 +/- 4.2 +/- 3.0) x 10(-5), (5.4 +/- 1.5 +/- 0.5) x 10(-5), (4.9 +/- 1.9 +/- 0.7) x 10(-5), where the first error is statistical and the second is systematic. Upper limits on the branching fractions for the decays of chi(c1,2) -> Sigma(0)(Sigma) over bar (0), Sigma(+)(Sigma) over bar (-) are estimated to be B(chi(c1) -> Sigma(0)(Sigma) over bar (0)) 6.2 x 10(-5), B(chi(c2) -> Sigma(0)<(Sigma) over bar (0)) 6.5 x 10(-5), B(chi(c1) -> Sigma(+)<(Sigma) over bar (-)) 8.7 x 10(-5) and B(chi(c2) -> Sigma(+)<(Sigma) over bar (-)) < 8.8 x 10(-5) at the 90% confidence level.
2013
87
3
032007-1
032007-9
M. Ablikim;M. N. Achasov;O. Albayrak;D. J. Ambrose;F. F. An;Q. An;J. Z. Bai;Y. Ban;J. Becker;J. V. Bennett;M. Bertani;J. M. Bian;E. Boger...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/133520
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