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-massenergy of 13 TeV. The D∗+s → D+s γ and D∗− → D0π− vector meson decays are usedwith the subsequent D+s → K+K−π+ and D0→ K+π− decays. All helicity amplitudesand phases are measured, and the longitudinal polarisation fraction is determined to befL = 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 toalign 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 be2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of theCabibbo-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 tobe 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledgeof the ratio of fragmentation fractions.

Angular analysis of B0→D∗−Ds∗+ with Ds∗+→Ds+γ decays / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:6(2021). [10.1007/JHEP06(2021)177]

Angular analysis of B0→D∗−Ds∗+ with Ds∗+→Ds+γ decays

Capriotti, L.;Casse, G.;Sarti, A.;
2021

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-massenergy of 13 TeV. The D∗+s → D+s γ and D∗− → D0π− vector meson decays are usedwith the subsequent D+s → K+K−π+ and D0→ K+π− decays. All helicity amplitudesand phases are measured, and the longitudinal polarisation fraction is determined to befL = 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 toalign 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 be2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of theCabibbo-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 tobe 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledgeof the ratio of fragmentation fractions.
2021
B physics, Branching fraction, Hadron-Hadron scattering (experiments), Polarization
01 Pubblicazione su rivista::01a Articolo in rivista
Angular analysis of B0→D∗−Ds∗+ with Ds∗+→Ds+γ decays / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:6(2021). [10.1007/JHEP06(2021)177]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1579538
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