A measurement is presented of decay-time-dependent CP violation in the decays B0->J/ψKS0 and B0->ψˆ(2S)KS0, 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/ψ ˆKS0)=0.12±0.07±0.02, S(B0->J/ψKS0)=0.83±0.08±0.01,C(B0->ψˆ(2S)KS0)=-’0.05±0.10±0.01,S(B0->ψˆ(2S)KS0)=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-B0bar 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€‚KS0 decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are C(B0->[ccbar] KS0)=-’0.017±0.029, S(B0->’[ccbar] KS0)=0.760±0.034,under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of CP violation in B0->J/ψKS0 and B0 ->ψ(2S)KS0 decays. JOURNAL OF HIGH ENERGY PHYSICS, 2017(11) [10.1007/JHEP11(2017)170].

Measurement of CP violation in B0->J/ψKS0 and B0’->ψ(2S)KS0 decays

Belloli, N.;Borgheresi, A.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;García Pardiñas, J.;Gotti, C.
;
Grillo, L.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2017

Abstract

A measurement is presented of decay-time-dependent CP violation in the decays B0->J/ψKS0 and B0->ψˆ(2S)KS0, 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/ψ ˆKS0)=0.12±0.07±0.02, S(B0->J/ψKS0)=0.83±0.08±0.01,C(B0->ψˆ(2S)KS0)=-’0.05±0.10±0.01,S(B0->ψˆ(2S)KS0)=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-B0bar 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€‚KS0 decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are C(B0->[ccbar] KS0)=-’0.017±0.029, S(B0->’[ccbar] KS0)=0.760±0.034,under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions
Articolo in rivista - Articolo scientifico
B physics; CKM angle beta; CP violation; Flavor physics; Hadron-Hadron scattering (experiments); Nuclear and High Energy Physics
English
2017
2017
11
170
open
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of CP violation in B0->J/ψKS0 and B0 ->ψ(2S)KS0 decays. JOURNAL OF HIGH ENERGY PHYSICS, 2017(11) [10.1007/JHEP11(2017)170].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/181642
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