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Observation of pentaquark resonances in $\Lambda b \to J/\psi K^−p$ decays
LHCb has recently reported the observation of exotic structures in the J/psip channel, in Lambda_b -> J/psiK^-p decay, which we discuss here and refer to as charmoniumpentaquarkstates. The data sample corresponds to an integrated luminosity of 3.0 fb^-1acquired with the LHCb detector from 7 and 8...
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Lenguaje: | eng |
Publicado: |
2016
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1051/epjconf/201612602002 http://cds.cern.ch/record/2282504 |
Sumario: | LHCb has recently reported the observation of exotic structures in the J/psip channel, in Lambda_b -> J/psiK^-p decay, which we discuss here and refer to as charmoniumpentaquarkstates. The data sample corresponds to an integrated luminosity of 3.0 fb^-1acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysisof the three-body final state reproduces the two-body mass and angular distributions. Toobtain a satisfactory fit of the structures seen in the J/psip mass spectrum, it is necessaryto include two Breit-Wigner amplitudes that each describe a resonant state. Details aregiven on the significance, and prefered quantum numbers, of these two resonances. |
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