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Observation of a J/ψΛ Resonance Consistent with a Strange Pentaquark Candidate in B−→J/ψΛ¯p Decays

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2023). Observation of a J/ψΛ Resonance Consistent with a Strange Pentaquark Candidate in B−→J/ψΛ¯p Decays. Physical Review Letters, 131(3): 031901. doi:10.1103/PhysRevLett.131.031901.


Cite as: https://hdl.handle.net/21.11116/0000-000D-DFAC-7
Abstract
An amplitude analysis of B→J/ψΛp decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9  fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4  MeV and 7.0±1.2±1.3  MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B mass to date, 5279.44±0.05±0.07  MeV, is obtained.