The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.

Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). Observation of CP Violation in B0 →j/ψρ (770)0 Decays. PHYSICAL REVIEW LETTERS, 137(3) [10.1103/6f6r-51br].

Observation of CP Violation in B0 →j/ψρ (770)0 Decays

Anelli A.;Arnone L.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Moro A.;Pizzichemi M.;Salomoni M.;
2026

Abstract

The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.
Articolo in rivista - Articolo scientifico
Astrophysics; Particle detectors; Tellurium compounds
English
15-lug-2026
2026
137
3
031803
none
Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2026). Observation of CP Violation in B0 →j/ψρ (770)0 Decays. PHYSICAL REVIEW LETTERS, 137(3) [10.1103/6f6r-51br].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/625385
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