The first full angular analysis of the B0 → D*− Ds*+ 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 Ds*+ → Ds+ γ and D*− → anti-D0 π− vector meson decays are used with the subsequent Ds+ → K+ K− π+ and anti-D0 → K+ π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be f_L = 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*− Ds*+) × B(Ds*+ → Ds+ γ)]/B(B0 → D*− Ds+) 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*− Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio B(Bs → D*− Ds+)/B(B0 → D*− Ds+) 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.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Angular Analysis of B0 → D*− Ds*+ with Ds*+ → Ds+ γ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(6), 0-29 [10.1007/JHEP06(2021)177].

Angular Analysis of B0 → D*− Ds*+ with Ds*+ → Ds+ γ Decays

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

Abstract

The first full angular analysis of the B0 → D*− Ds*+ 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 Ds*+ → Ds+ γ and D*− → anti-D0 π− vector meson decays are used with the subsequent Ds+ → K+ K− π+ and anti-D0 → K+ π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be f_L = 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*− Ds*+) × B(Ds*+ → Ds+ γ)]/B(B0 → D*− Ds+) 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*− Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio B(Bs → D*− Ds+)/B(B0 → D*− Ds+) 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.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Angular Analysis of B0 → D*− Ds*+ with Ds*+ → Ds+ γ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(6), 0-29 [10.1007/JHEP06(2021)177].
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/11585/849001
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