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.File | Dimensione | Formato | |
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PRD87.012007.arxiv.pdf
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