RT Journal Article
T1 Study of η − η′ mixing from measurement of B 0(s) → J/ψη(′) decay rates
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 García Pardiñas, Julián
A1 Hernando Morata, José Ángel
A1 Plo Casasus, Máximo
A1 Romero Vidal, Antonio
A1 Saborido Silva, Juan José
A1 Sanmartín Sedes, Brais
A1 Santamarina Ríos, Cibrán
A1 Vázquez Regueiro, Pablo
A1 Vázquez Sierra, Carlos
A1 Vieites Díaz, María
K1 Spectroscopy
K1 Hadron-Hadron Scattering
K1 QCD
K1 Branching fraction
K1 B physics
AB A study of B and Bs meson decays into J/ψ η and J/ψ η′ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment and corresponding to 3.0 fb−1 of integrated luminosity. The decay B0 → J/ψ η′ is observed for the first time. The following ratios of branching fractions are measured:B(B0→J/ψη′)B(B0s→ J/ψη′)=(2.28±0.65 (stat)±0.10 (syst)±0.13 (fs/fd))×10−2,B(B0→ J/ψη)B(B0s→ J/ψη)=(1.85±0.61 (stat)±0.09 (syst)±0.11 (fs/fd))×10−2,where the third uncertainty is related to the present knowledge of fs/fd, the ratio between the probabilities for a b quark to form a Bs or a B0 meson. The branching fraction ratios are used to determine the parameters of η − η′ meson mixing. In addition, the first evidence for the decay Bs → ψ(2S)η′ is reported, and the relative branching fraction is measured,B(B0s→ ψ(2S)η′)B(B0s→ J/ψη′)=(38.7±9.0 (stat)±1.3 (syst)±0.9(B))×10−2,where the third uncertainty is due to the limited knowledge of the branching fractions of J/ψ and ψ(2S) mesons.
PB Springer
SN 1029-8479
YR 2015
FD 2015
LK http://hdl.handle.net/10347/21923
UL http://hdl.handle.net/10347/21923
LA eng
NO Aaij, R., Adeva, B., Adinolfi, M. et al. Study of η − η′ mixing from measurement of B 0(s) → J/ψη(′) decay rates. J. High Energ. Phys. 2015, 24 (2015). https://doi.org/10.1007/JHEP01(2015)024
DS Minerva
RD 24 abr 2026