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April 30, 2026
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First observation of the decay Λ0b→ηc(1S)pK−

Physical Review D - Particles, Fields, Gravitation and Cosmology. 2020. Vol. 102. No. 11. Article 112012.
Aaij R., Beteta C. A., Arzymatov K., Belavin V., Borisyak M., Derkach D., Гайнцева Т. А., Hushchyn M., Kazeev N., Maevskiy A., Филиппов А. А., Попов С. А., Ratnikov F., Ryzhikov A., Ustyuzhanin A., LHCb C.

The decay Λ0b→ηc(1S)pK− is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5  fb−1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λ0b→J/ψpK− decay as a normalization mode, to be B(Λ0b→ηc(1S)pK−)=(1.06±0.16±0.06+0.22−0.19)×10−4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S)p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λ0b→Pc(4312)+K−)×B(Pc(4312)+→ηc(1S)p)B(Λ0b→ηc(1S)pK−)<0.24 is obtained at the 95% confidence level.

Research target: Physics
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Keywords: high energy physicsфизика высоких энергий
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Machine learning to check and improve the quality of data collected at the Large Hadron Collider and other particle physics experiments (2021)
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