TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2021
DA  - 2021//
TI  - Angular analysis of B0 -> D*- D*s+ with D*s+ -> Ds + gamma decays
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 177
EP  - 30pp
VL  - 06
IS  - 6
PB  - Springer
KW  - B physics
KW  - Branching fraction
KW  - Hadron-Hadron scattering (experiments)
KW  - Polarization
AB  - 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+gamma and D*- -> D<overbar></mml:mover>0- vector meson decays are used with the subsequent Ds+ -> K+K-pi (+) and D<overbar></mml:mover>0 -> K+pi (-) 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+) x B(Ds+-> Ds+gamma)]/B(B-0 -> 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 B-s -> D(*-)Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio B(B-s -> D(*-)Ds<mml:mo>+)/B(B-0 -> D(*-)Ds<mml:mo>+) 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.<fig id="Figa" position="anchor"><graphic position="anchor" specific-use="HTML" mime-subtype="JPEG" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MediaObjects/13130_2021_16089_Figa_HTML.jpg" id="MO1"></graphic
SN  - 1029-8479
UR  - https://arxiv.org/abs/2105.02596
UR  - https://doi.org/10.1007/JHEP06(2021)177
DO  - 10.1007/JHEP06(2021)177
LA  - English
N1  - WOS:000671168600002
ID  - LHCbCollaborationAaij_etal2021
ER  -