Using a sample of 1.06 x 10^8 psi' mesons collected with the BESIII detector at theBEPCII e+e- collider and chi_cJ mesons produced via radiative transitions from the psi', we report the first observation for psi' -> pbarK+Sigma0 + c.c. (charge conjugate), as well as improved measurements for the chi_cJ hyperon decays chi_cJ -> pbarK+Lambda + c.c. The branching fractions are measured to be B(psi' -> pbarK+Sigma0 + c.c.) = (1.67 +- 0.13 +- 0.12) x 10^-5, B(chi_c0 -> pbarK+Lambda + c.c.) = (13.2 +- 0.3 +- 1.0) x 10^-4, B(chi_c1 -> pbarK+Lambda + c.c.) = (4.5 +- 0.2 +- 0.4) x 10^-4, and B(chi_c2 -> pbarK+Lambda + c.c.) = (8.4 +- 0.3 +- 0.6) x 10^-4, where the first error is statistical, and the second is systematic. In the decay of chi_c0 -> pbarK+Lambda + c.c., an anomalous enhancement near threshold is observed in the invariant mass distribution of pbarLambda + c.c., which cannot be explained by phase space.

Measurements of ψ^{′}→p[over ¯]K^{+}Σ^{0} and χ_{cJ}→p[over ¯]K^{+}Λ

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

Abstract

Using a sample of 1.06 x 10^8 psi' mesons collected with the BESIII detector at theBEPCII e+e- collider and chi_cJ mesons produced via radiative transitions from the psi', we report the first observation for psi' -> pbarK+Sigma0 + c.c. (charge conjugate), as well as improved measurements for the chi_cJ hyperon decays chi_cJ -> pbarK+Lambda + c.c. The branching fractions are measured to be B(psi' -> pbarK+Sigma0 + c.c.) = (1.67 +- 0.13 +- 0.12) x 10^-5, B(chi_c0 -> pbarK+Lambda + c.c.) = (13.2 +- 0.3 +- 1.0) x 10^-4, B(chi_c1 -> pbarK+Lambda + c.c.) = (4.5 +- 0.2 +- 0.4) x 10^-4, and B(chi_c2 -> pbarK+Lambda + c.c.) = (8.4 +- 0.3 +- 0.6) x 10^-4, where the first error is statistical, and the second is systematic. In the decay of chi_c0 -> pbarK+Lambda + c.c., an anomalous enhancement near threshold is observed in the invariant mass distribution of pbarLambda + c.c., which cannot be explained by phase space.
2013
87
012007-1
012007-10
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/2318/130753
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