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Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S et al (show 943 more authors) , Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Aliouche, Z, Alkhazov, G, Cartelle, P Alvarez, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Baldini, W, Leite, J Baptista, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, JM, Bassi, G, Batsukh, B, Battig, A, Bay, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Belavin, V, Belin, S, Bellee, V, Belous, K, Belov, I, Belyaev, I, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Berninghoff, D, Bernstein, HC, Bertella, C, Bertolin, A, Betancourt, C, Betti, F, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bian, L, Bieker, MS, Bifani, S, Billoir, P, Birch, M, Bishop, FCR, Bitadze, 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(2021)
Angular analysis of B0→D-Ds+ with Ds+→Ds+γ decays.
JOURNAL OF HIGH ENERGY PHYSICS, 2021 (6).
177-.
Abstract
The first full angular analysis of the $B^0 \to D^{*-} D_s^{*+}$ 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 $D_s^{*+} \to D_s^+
\gamma$ and $D^{*-} \to \bar{D}^0 \pi^-$ vector meson decays are used with the
subsequent $D_s^+ \to K^+ K^- \pi^+$ and $\bar{D}^0 \to K^+ \pi^-$ decays. All
helicity amplitudes and phases are measured, and the longitudinal polarisation
fraction is determined to be $f_{\rm L} = 0.578 \pm 0.010 \pm 0.011$ 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 $[\mathcal{B}(B^0 \to D^{*-} D_s^{*+}) \times
\mathcal{B}(D_s^{*+} \to D_s^+ \gamma)]/\mathcal{B}(B^0 \to D^{*-} D_s^+)$ is
measured to be $2.045 \pm 0.022 \pm 0.071$ with world-best precision. In
addition, the first observation of the Cabibbo-suppressed $B_s^0 \to D^{*-}
D_s^+$ decay is made with a significance of seven standard deviations. The
branching fraction ratio $\mathcal{B}(B_s^0 \to D^{*-} D_s^+)/\mathcal{B}(B^0
\to D^{*-} D_s^+)$ is measured to be $0.049 \pm 0.006 \pm 0.003 \pm 0.002$,
where the third uncertainty is due to limited knowledge of the ratio of
fragmentation fractions.
Item Type: |
Article
|
Additional Information: |
All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-006.html (LHCb
public pages) |
Uncontrolled Keywords: |
B physics, Branching fraction, Hadron-Hadron scattering (experiments), Polarization |
Divisions: |
Faculty of Science and Engineering > School of Physical Sciences |
Depositing User: |
Symplectic Admin
|
Date Deposited: |
02 Sep 2021 08:58 |
Last Modified: |
14 Mar 2024 23:01 |
DOI: |
10.1007/JHEP06(2021)177 |
Related URLs: |
|
URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3134983 |