A flavour-tagged time-dependent angular analysis of B0s → J/ψ (→ e+ e−) ϕ decays is presented where the J/ψ meson is reconstructed through its decay to an e+ e− pair. 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-violating phase and lifetime parameters of the B0s system are measured to be ϕ_s = 0.00 ± 0.28 ± 0.07 rad, ΔΓ_s = 0.115 ± 0.045 ± 0.011 ps^−1 and Γ_s = 0.608 ± 0.018 ± 0.012 ps^−1, where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the B0s → J/ψ ϕ decay with an e+ e− pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First Measurement of the CP-Violating Phase in B0s → J/ψ (→ e+ e−) ϕ Decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(11), 1-18 [10.1140/epjc/s10052-021-09711-7].

First Measurement of the CP-Violating Phase in B0s → J/ψ (→ e+ e−) ϕ Decays

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Zucchelli, S.;
2021

Abstract

A flavour-tagged time-dependent angular analysis of B0s → J/ψ (→ e+ e−) ϕ decays is presented where the J/ψ meson is reconstructed through its decay to an e+ e− pair. 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-violating phase and lifetime parameters of the B0s system are measured to be ϕ_s = 0.00 ± 0.28 ± 0.07 rad, ΔΓ_s = 0.115 ± 0.045 ± 0.011 ps^−1 and Γ_s = 0.608 ± 0.018 ± 0.012 ps^−1, where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the B0s → J/ψ ϕ decay with an e+ e− pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First Measurement of the CP-Violating Phase in B0s → J/ψ (→ e+ e−) ϕ Decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(11), 1-18 [10.1140/epjc/s10052-021-09711-7].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/849177
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