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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185482
Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays
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The first full angular analysis of the B0 → D∗−D∗+ s decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The D∗+ s → D+ s γ and D∗− → D 0 π − vector meson decays are used with the subsequent D+ s → K+K−π + and D 0 → K+π − decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578±0.010±0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [B(B0 → D∗−D∗+ s ) × B(D∗+ s → D+ s γ)]/B(B0 → D∗−D+ s ) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D∗−D+ s decay is made with a significance of seven standard deviations. The branching fraction ratio B(Bs → D∗−D+ s )/B(B0 → D∗−D+ s ) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions.
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LHCb Collaboration, ALFONSO ALBERO, Alejandro, GARCÍA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GIRONELLA GIRONELL, P., GOMEZ FERNANDEZ, S., GRAUGÉS POUS, Eugeni, LOBO SALVIA, A., MAURICIO, J., VAZQUEZ GOMEZ, R., MARIN BENITO, Carla. Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays. _Journal of High Energy Physics_. 2021. Vol. 2021, núm. 1-30. [consulta: 9 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185482]