RT Journal Article
T1 Measurement of CP violation in B0 → J/ψK 0S and B0 → ψ(2S)K0S decays
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 Lucio Martínez, Miriam
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
K1 B physics
K1 CKM angle beta
K1 CP violation
K1 Flavor physics
K1 Hadron-Hadron scattering (experiments)
AB A measurement is presented of decay-time-dependent CP violation in the decays B0 → J/ψ K 0S and B0 → ψ(2S)K 0S, where the J/ψ is reconstructed from two electrons and the ψ(2S) from two muons. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The CP -violation observables are measured to beC(B0→J/ψK0S)=0.12±0.07±0.02,S(B0→J/ψK0S)=0.83±0.08±0.01,C(B0→ψ(2S)K0S)=−0.05±0.10±0.01,S(B0→ψ(2S)K0S)=0.84±0.10±0.01,where C describes CP violation in the direct decay, and S describes CP violation in the interference between the amplitudes for the direct decay and for the decay after B0−B¯0 oscillation. The first uncertainties are statistical and the second are systematic. The two sets of results are compatible with the previous LHCb measurement using B0 → J/ψ K 0S decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results areC(B0→[cc¯]K0S)=−0.017±0.029,S(B0→[cc¯]K0S)=0.760±0.034,under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.
PB Springer
SN 1029-8479
YR 2017
FD 2017
LK http://hdl.handle.net/10347/22658
UL http://hdl.handle.net/10347/22658
LA eng
NO Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of CP violation in B0 → J/ψK 0S and B0 → ψ(2S)K0S decays. J. High Energ. Phys. 2017, 170 (2017). https://doi.org/10.1007/JHEP11(2017)170
DS Minerva
RD 22 abr 2026