We report the observation of the X(3823) state in the process e+e−→π+π−X(3823)→π+π−γχc1 with a statistical significance of 6.2σ, in data samples at center-of-mass energies s√=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the X(3823) state is (3821.7±1.3±0.7) MeV/c2, where the first error is statistical and the second systematic, and the width is less than 16 MeV at the 90% confidence level. The products of the Born cross sections for e+e−→π+π−X(3823) and the branching ratio B[X(3823)→γχc1,c2] are also measured. These measurements are in good agreement with the assignment of the X(3823) state as the ψ(1 D23) charmonium state.
Observation of the ψ(13D2) state in e+e-→π+π-γχc1 at BESIII
AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, MARCO GIOVANNI;DE MORI, FRANCESCA;GRECO, Michela;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;
2015-01-01
Abstract
We report the observation of the X(3823) state in the process e+e−→π+π−X(3823)→π+π−γχc1 with a statistical significance of 6.2σ, in data samples at center-of-mass energies s√=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the X(3823) state is (3821.7±1.3±0.7) MeV/c2, where the first error is statistical and the second systematic, and the width is less than 16 MeV at the 90% confidence level. The products of the Born cross sections for e+e−→π+π−X(3823) and the branching ratio B[X(3823)→γχc1,c2] are also measured. These measurements are in good agreement with the assignment of the X(3823) state as the ψ(1 D23) charmonium state.File | Dimensione | Formato | |
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PhysRevLett.115.011803.pdf
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