Amplitude analysis of the B(s)0→ K* 0K‾* 0 decays and measurement of the branching fraction of the B0→ K* 0K‾* 0 decay
Name
Aaij2019_Article_AmplitudeAnalysisOfTheBs0K0K0B.pdf
Description
Published version
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666.55 KB
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5107833dbe5d95e884918f3f0d17a0e8
Author(s)
The LHCb Collaboration
Boettcher, Thomas Julian
Craik, Daniel C
Weisser, Constantin
Williams, Michael
Date Issued
2019
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Version
Final published version
Abstract
The $B^0 \to K^{*0} \overline{K}^{*0}$ and $B^0_s \to K^{*0}
\overline{K}^{*0}$ decays are studied using proton-proton collision data
corresponding to an integrated luminosity of 3fb$^{-1}$. An untagged and
time-integrated amplitude analysis of $B^0_{(s)} \to (K^+\pi^-)(K^-\pi^+) $
decays in two-body invariant mass regions of 150 MeV$/c^2$ around the $K^{*0}$
mass is performed. A stronger longitudinal polarisation fraction in the ${B^0
\to K^{*0} \overline{K}^{*0}}$ decay, ${f_L = 0.724 \pm 0.051 \,({\rm stat})
\pm 0.016 \,({\rm syst})}$, is observed as compared to ${f_L = 0.240 \pm 0.031
\,({\rm stat}) \pm 0.025 \,({\rm syst})}$ in the ${B^0_s\to K^{*0}
\overline{K}^{*0}}$ decay. The ratio of branching fractions of the two decays
is measured and used to determine $\mathcal{B}(B^0 \to K^{*0}
\overline{K}^{*0}) = (8.0 \pm 0.9 \,({\rm stat}) \pm 0.4 \,({\rm syst})) \times
10^{-7}$.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP07(2019)032
