RT Journal Article
T1 Observation of the Λ0b → J/ψ pπ − decay
A1 LHCb Collaboration, 
A1 Adeva Andany, Bernardo
A1 Álvarez Cartelle, Paula
A1 Dosil Suárez, Álvaro
A1 Fernández Albor, Víctor Manuel
A1 Gallas Torreira, Abraham Antonio
A1 Hernando Morata, José Ángel
A1 Pazos Álvarez, Antonio
A1 Pérez Trigo, Eliseo
A1 Plo Casasus, Máximo
A1 Romero Vidal, Antonio
A1 Saborido Silva, Juan José
A1 Sanmartín Sedes, Brais
A1 Santamarina Ríos, Cibrán
A1 Seco Miguélez, Marcos Antonio
A1 Vázquez Regueiro, Pablo
A1 Vázquez Sierra, Carlos
A1 Vieites Díaz, María
K1 B physics
K1 CP violation
K1 Branching fraction
K1 Flavor physics
K1 Hadron-Hadron Scattering
AB The first observation of the Cabibbo-suppressed decay Λ  0b → J/ψpπ − is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. A prominent signal is observed and the branching fraction relative to the decay mode Λ  0b → J/ψpK − is determined to beB(Λ0b→J/ψpπ−)B(Λ0b→J/ψpK−)=0.0824±0.0025 (stat)±0.0042 (syst).A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to beACP(Λ0b→J/ψpπ−)−ACP(Λ0b→J/ψpK−)=(+5.7±2.4 (stat)±1.2 (syst))%,which is compatible with CP symmetry at the 2.2σ level.
PB Springer
SN 1029-8479
YR 2014
FD 2014
LK http://hdl.handle.net/10347/21838
UL http://hdl.handle.net/10347/21838
LA eng
NO Aaij, R., Adeva, B., Adinolfi, M. et al. Observation of the Λ0b → J/ψ pπ − decay. J. High Energ. Phys. 2014, 103 (2014). https://doi.org/10.1007/JHEP07(2014)103
DS Minerva
RD 26 abr 2026