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Angular analysis of B0 → D*- D*+s with D*+s → D+s γ decays

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*− → D0 π- vector meson decays are used with the subsequent D+s → K+K−π+ and D0 → K+π− decays. All...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Frau, Giulia (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Li, Peilian (Author) , Malygina, Hanna (Author) , Marks, Jörg (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: June 29, 2021
In: Journal of high energy physics
Year: 2021, Issue: 6, Pages: 1-29
ISSN:1029-8479
DOI:10.1007/JHEP06(2021)177
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP06(2021)177
Verlag, lizenzpflichtig, Volltext: https://link.springer.com/article/10.1007%2FJHEP06%282021%29177
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Author Notes:The LHCb collaboration
Description
Summary: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*− → D0 π- vector meson decays are used with the subsequent D+s → K+K−π+ and D0 → 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.
Item Description:Im Text sind "0", "*", "+" und "-" hochgestellt, "s" jeweils tiefgestellt
The LHCb collaboration: R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, G. Frau, D. Gerick, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, P. Li, H. Malygina, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und viele weitere]
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP06(2021)177

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