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678023.pdf (463.78 KB)

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2017-11

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cc-by (c) Alfonso Albero, Alejandro et al., 2017
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/186504

Measurement of CP violation in B 0 → J/ ψK S 0 and B 0 → ψ(2 S) K S 0 decays

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Recurs relacionat

https://doi.org/10.1007/JHEP11(2017)170

Resum

A measurement is presented of decay-time-dependent CP violation in the decays B 0 → J/ ψ K S 0 and B 0 → ψ(2 S) K S 0 , where the J/ ψ is reconstructed from two electrons and the ψ(2 S) 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({B}^0\to J/ψ {K}S^0)=0.12± 0.07± 0.02, {}S({B}^0\to J/ψ {K}S^0)=0.83± 0.08± 0.01, {}C({B}^0\to ψ (2S){K}S^0)=-0.05± 0.10± 0.01, {}S({B}^0\to ψ (2S){K}S^0)=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 {B}^0-{\overline{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 B 0 → J/ ψ K S 0 decays, where the J/ ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are C({B}^0\to [c\overline{c}]{K}S^0)=-0.017± 0.029, {}S({B}^0\to [c\overline{c}]{K}S^0)=0.760± 0.034, under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.

Matèries

Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

Matèries (anglès)

Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

Citació

Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

ALFONSO ALBERO, Alejandro, et al. Measurement of CP violation in B 0 → J/ ψK S 0 and B 0 → ψ(2 S) K S 0 decays. Journal of High Energy Physics. 2017. Vol. 2017, num. 170, pags. 1-18. ISSN 1126-6708. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/186504

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