A measurement is presented of decay-time-dependent CP violation in the decays B0 → J/ψ K S 0 and B0 → ψ(2S)K S 0 , 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 (0→0S) = 0.12±0.07±0.02, (0→0S) =0.83±0.08±0.01, (0→(2)0S)= −0.05±0.10±0.01, (0→(2)0S)= 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 0−⎯⎯⎯⎯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 S 0 decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are (0→[⎯⎯⎯]0S)=−0.017±0.029,(0→[⎯⎯⎯]0S)=0.760±0.034, under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.

Measurement of CP violation in B0→ J/ψK<inf>S</inf>0and B0→ ψ(2S)K<inf>S</inf>0decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2017:11(2017). [10.1007/JHEP11(2017)170]

Measurement of CP violation in B0→ J/ψKS0and B0→ ψ(2S)KS0decays

Capriotti, L.;Casse, G.;Kazeev, N.;Sarti, A.;Sciubba, A.;
2017

Abstract

A measurement is presented of decay-time-dependent CP violation in the decays B0 → J/ψ K S 0 and B0 → ψ(2S)K S 0 , 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 (0→0S) = 0.12±0.07±0.02, (0→0S) =0.83±0.08±0.01, (0→(2)0S)= −0.05±0.10±0.01, (0→(2)0S)= 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 0−⎯⎯⎯⎯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 S 0 decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are (0→[⎯⎯⎯]0S)=−0.017±0.029,(0→[⎯⎯⎯]0S)=0.760±0.034, under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.
2017
B physics, CKM angle beta, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of CP violation in B0→ J/ψK<inf>S</inf>0and B0→ ψ(2S)K<inf>S</inf>0decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2017:11(2017). [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/11573/1074324
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