Search for the doubly charmed baryon Ξ+cc in the Ξ+cπ−π+ final state
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13130_2021_Article_17378.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellán Beteta, C.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Agapopoulou, C.
Aidala, C. A.
Aiola, S.
Date Issued
December 16, 2021
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2021 Dec 16;2021(12):107
Version
Final published version
Abstract
Abstract
A search for the doubly charmed baryon
Ξ
cc
+
$$ {\varXi}_{cc}^{+} $$
is performed in the
Ξ
c
+
π
−
π
+
$$ {\varXi}_c^{+}{\pi}^{-}{\pi}^{+} $$
invariant-mass spectrum, where the
Ξ
c
+
$$ {\varXi}_c^{+} $$
baryon is reconstructed in the pK−π+ final state. The study uses proton-proton collision data collected with the LHCb detector at a centre- of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 5.4 fb−1. No significant signal is observed in the invariant-mass range of 3.4–3.8 GeV/c2. Upper limits are set on the ratio of branching fractions multiplied by the production cross-section with respect to the
Ξ
cc
+
+
$$ {\varXi}_{cc}^{++} $$
→ (
Ξ
c
+
$$ {\varXi}_c^{+} $$
→ pK−π+)π+ decay for different
Ξ
cc
+
$$ {\varXi}_{cc}^{+} $$
mass and lifetime hypotheses in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2.5 to 25 GeV/c. The results from this search are combined with a previously published search for the
Ξ
cc
+
$$ {\varXi}_{cc}^{+} $$
→
Λ
c
+
$$ {\varLambda}_c^{+} $$
K−π+ decay mode, yielding a maximum local significance of 4.0 standard deviations around the mass of 3620 MeV/c2, including systematic uncertainties. Taking into account the look-elsewhere effect in the 3.5–3.7 GeV/c2 mass window, the combined global significance is 2.9 standard deviations including systematic uncertainties.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP12(2021)107
