Measurement of CP violation in B0 → J/ψK 0S and B0 → ψ(2S)K0S decays
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Título: | Measurement of CP violation in B0 → J/ψK 0S and B0 → ψ(2S)K0S decays |
Autor/a: | LHCb Collaboration Adeva Andany, Bernardo Borsato, Martino Chobanova, Veronika Cid Vidal, Xabier Dosil Suárez, Álvaro Fernández Prieto, Antonio Gallas Torreira, Abraham Antonio García Pardiñas, Julián Lemos Cid, Edgar Lucio Martínez, Miriam Martínez Santos, Diego Plo Casasus, Máximo Prisciandaro, Jessica Ramos Pernas, Miguel Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Vázquez Regueiro, Pablo Vieites Díaz, María Vázquez Sierra, Carlos |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
Palabras chave: | B physics | CKM angle beta | CP violation | Flavor physics | Hadron-Hadron scattering (experiments) | |
Data: | 2017 |
Editor: | Springer |
Cita bibliográfica: | 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 |
Resumo: | 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 be C(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 are C(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. |
Versión do editor: | https://doi.org/10.1007/JHEP11(2017)170 |
URI: | http://hdl.handle.net/10347/22658 |
DOI: | 10.1007/JHEP11(2017)170 |
ISSN: | 1029-8479 |
Dereitos: | © CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
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© CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
© CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.