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Title: Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays
Author: LHCb Collaboration
Alfonso Albero, Alejandro
Garcia Moreno, P.
Garrido Beltrán, Lluís
Gironella Gironell, P.
Gomez Fernandez, S.
Graugés Pous, Eugeni
Lobo Salvia, A.
Mauricio, J.
Vazquez Gomez, R.
Marin Benito, Carla
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: 2021
Publisher: Springer Verlag
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2021, vol. 2021, p. 1-30
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ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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