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First observation of the Λb0→ D+D−Λ decay

Aaij, R. ; Ruiz-Vidal, Joan LU and Zunica, G. (2024) In Journal of High Energy Physics 2024(7).
Abstract
The Λb0 → D+D−Λ 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 fb−1. Using the B0 → D+D−KS0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be (Formula presented.) where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, BB0→D+D−KS0, and the cross-section ratio, σΛb0/σB0, previously measured by LHCb are used to derive the branching fraction of the Λb0→ D+D−Λ decay (Formula presented.) where the third and fourth contributions are due to uncertainties... (More)
The Λb0 → D+D−Λ 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 fb−1. Using the B0 → D+D−KS0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be (Formula presented.) where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, BB0→D+D−KS0, and the cross-section ratio, σΛb0/σB0, previously measured by LHCb are used to derive the branching fraction of the Λb0→ D+D−Λ decay (Formula presented.) where the third and fourth contributions are due to uncertainties of BB0→D+D−KS0 and σΛb0/σB0, respectively. Inspection of the D+Λ and D+D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+D−Λ decay is also observed for the first time as a partially reconstructed component in the D+D−Λ invariant mass spectrum. © The Author(s) 2024. (Less)
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Contribution to journal
publication status
published
subject
keywords
B Physics, Branching fraction, Flavour Physics, Hadron-Hadron Scattering
in
Journal of High Energy Physics
volume
2024
issue
7
article number
140
publisher
Springer
external identifiers
  • scopus:85199130521
ISSN
1029-8479
DOI
10.1007/JHEP07(2024)140
language
English
LU publication?
yes
id
c989d3cb-6b24-416c-b2ad-b6ae10b095dc
date added to LUP
2024-09-12 14:18:55
date last changed
2024-09-12 14:19:19
@article{c989d3cb-6b24-416c-b2ad-b6ae10b095dc,
  abstract     = {{The Λb0 → D+D−Λ 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 fb−1. Using the B0 → D+D−KS0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be (Formula presented.) where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, BB0→D+D−KS0, and the cross-section ratio, σΛb0/σB0, previously measured by LHCb are used to derive the branching fraction of the Λb0→ D+D−Λ decay (Formula presented.) where the third and fourth contributions are due to uncertainties of BB0→D+D−KS0 and σΛb0/σB0, respectively. Inspection of the D+Λ and D+D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+D−Λ decay is also observed for the first time as a partially reconstructed component in the D+D−Λ invariant mass spectrum. © The Author(s) 2024.}},
  author       = {{Aaij, R. and Ruiz-Vidal, Joan and Zunica, G.}},
  issn         = {{1029-8479}},
  keywords     = {{B Physics; Branching fraction; Flavour Physics; Hadron-Hadron Scattering}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{First observation of the Λb0→ D+D−Λ decay}},
  url          = {{http://dx.doi.org/10.1007/JHEP07(2024)140}},
  doi          = {{10.1007/JHEP07(2024)140}},
  volume       = {{2024}},
  year         = {{2024}},
}