RT Journal Article
T1 Observation of the Ξ−b→J/ψΛK−decay
A1 LHCb Collaboration, 
A1 Adeva Andany, Bernardo
A1 Borsato, Martino
A1 Chobanova, Veronika
A1 Cid Vidal, Xabier
A1 Dosil Suárez, Álvaro
A1 Fernández Prieto, Antonio
A1 Gallas Torreira, Abraham Antonio
A1 García Pardiñas, Julián
A1 Lemos Cid, Edgar
A1 Martínez Santos, Diego
A1 Plo Casasus, Máximo
A1 Prisciandaro, Jessica
A1 Ramos Pernas, Miguel
A1 Romero Vidal, Antonio
A1 Saborido Silva, Juan José
A1 Sanmartín Sedes, Brais
A1 Santamarina Ríos, Cibrán
A1 Vázquez Regueiro, Pablo
A1 Vieites Díaz, María
A1 Vázquez Sierra, Carlos
AB The observation of the decay Ξ−b→J/ψΛK−is reported, using a data sample corresponding to an integrated luminosity of 3 fb−1, collected by the LHCb detector in ppcollisions at centre-of-mass energies of 7and 8 TeV. The production rate of Ξ−bbaryons detected in the decay Ξ−b→J/ψΛK−is measured relative to that of Λ0bbaryons using the decay Λ0b→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25 GeV/cand rapidity 2.0 <y <4.5, the measured ratio isfΞ−bfΛ0bB(Ξ−b→ J/ψΛK−)B(Λ0b→ J/ψΛ)= (4.19±0.29 (stat)± 0.15 (syst))×10−2,where fΞ−band fΛ0bare the fragmentation fractions of b →Ξ−band b →Λ0btransitions, and Brepresents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξ−band Λ0bbaryons is measured to beM(Ξ−b )− M(Λ0b ) = 177.08±0.47 (stat)± 0.16 (syst)MeV/c2.
PB Elsevier
SN 0370-2693
YR 2017
FD 2017
LK http://hdl.handle.net/10347/22485
UL http://hdl.handle.net/10347/22485
LA eng
NO Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., ... & Cartelle, P. A. (2017). Observation of the Ξb−→ J/ψΛK− decay. Physics Letters B, 772, 265-273
DS Minerva
RD 27 abr 2026