A flavour-tagged time-dependent angular analysis of Bs0→J/ψϕ 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 ,Te V , corresponding to an integrated luminosity of 3 ,fb - 1. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be ϕs= 0.00 ± 0.28 ± 0.07 ,rad , Δ Γ 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 Bs0→J/ψϕ 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., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(11) [10.1140/epjc/s10052-021-09711-7].

First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays

Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Martinazzoli L.;Martinelli M.;Meloni S.;Petruzzo M.;Shields E. B.;
2021

Abstract

A flavour-tagged time-dependent angular analysis of Bs0→J/ψϕ 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 ,Te V , corresponding to an integrated luminosity of 3 ,fb - 1. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be ϕs= 0.00 ± 0.28 ± 0.07 ,rad , Δ Γ 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 Bs0→J/ψϕ 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.
Articolo in rivista - Articolo scientifico
Flavour Physics; CP violation;
English
Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(11) [10.1140/epjc/s10052-021-09711-7].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/340216
Citazioni
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
Social impact