Search for the doubly charmed baryon Ξ+cc in the Ξ+cπ−π+ final state
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.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; ... Show more Show less
Download13130_2021_Article_17378.pdf (1.113Mb)
Publisher with Creative Commons License
Publisher with Creative Commons License
Creative Commons Attribution
Terms of use
Metadata
Show full item recordAbstract
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.
Date issued
2021-12-16Department
Massachusetts Institute of Technology. Department of PhysicsPublisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2021 Dec 16;2021(12):107
Version: Final published version