First observation of the ฮ0๐ โ D+Dโฮ decay
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinรฉn, F.
Ackernley, T.
Adams, J. A.
Adefisoye, A. A.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Date Issued
July 16, 2024
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. First observation of the ฮ0๐
โ D+Dโฮ decay. J. High Energ. Phys. 2024, 140 (2024).
Version
Final published version
Abstract
The ฮ0๐
โ D+Dโฮ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.3 fbโ1. Using the B0 โ ๐ท+๐ทโ๐พ0๐
decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be
๎พ=ฯฮ0๐ฯ๐ต0=๎ฎ(ฮ0๐โ๐ท+๐ทโฮ)๎ฎ(๐ต0โ๐ท+๐ทโ๐พ0S)=0.179ยฑ0.022ยฑ0.014,
where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, ๎ฎ(๐ต0โ๐ท+๐ทโ๐พ0S)
, and the cross-section ratio, ฯฮ0๐/ฯ๐ต0
, previously measured by LHCb are used to derive the branching fraction of the ฮ0๐
โ D+Dโฮ decay
๎ฎ(ฮ0๐โ๐ท+๐ทโฮ)=(1.24ยฑ0.15ยฑ0.10ยฑ0.28ยฑ0.11)ร10โ4,
where the third and fourth contributions are due to uncertainties of ๎ฎ(๐ต0โ๐ท+๐ทโ๐พ0S)
and ฯฮ0๐/ฯ๐ต0
, respectively. Inspection of the D+ฮ and D+Dโ invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The ฮ0๐
โ D*+Dโฮ decay is also observed for the first time as a partially reconstructed component in the D+Dโฮ invariant mass spectrum.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep07(2024)140
