Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

This paper presents an analysis of the Λ0b→ J/ψΛ angular distribution and the transverse production polarisation of Λ0b baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1,...

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Detalhes bibliográficos
Autores: LHCb Collaboration, Alfonso Albero, Alejandro, Calvo Gómez, Míriam, Camboni, Alessandro, Coquereau, Samuel, Garrido Beltrán, Lluís, Gascón Fora, David, Gironella Gironell, Pere, Golobardes, Elisabet, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Manera Escalero, R., Marin Benito, Carla, Vázquez Gómez, Ricard, Vilasis-Cardona, Xavier
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/185289
Acesso em linha:https://hdl.handle.net/2445/185289
Access Level:acceso abierto
Palavra-chave:Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Experiments
Large Hadron Collider (France and Switzerland)
Particle physics
Descrição
Resumo:This paper presents an analysis of the Λ0b→ J/ψΛ angular distribution and the transverse production polarisation of Λ0b baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λ0b transverse momentum and pseudorapidity of 1 < pT < 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λ0b baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration.

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