Search for the doubly charmed baryon Ξ cc + in the Ξ c + π − π + final state
Creators: name: Aaij, R.
name: Abdelmotteleb, A. S. W.
name: Abellán Beteta, C.
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Afsharnia, H.
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name: Alessio, F.
name: Alexander, M.
name: Alfonso Albero, A.
name: Aliouche, Z.
name: Alkhazov, G.
name: Alvarez Cartelle, P.
name: Amato, S.
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name: An, L.
name: Anderlini, L.
name: Andreianov, A.
name: Andreotti, M.
name: Archilli, F.
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name: Aslanides, E.
name: Atzeni, M.
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name: Bachmann, S.
name: Bachmayer, M.
name: Back, J. J.
name: Baladron Rodriguez, P.
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name: Baldini, W.
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name: Barbetti, M.
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name: Bediaga, I.
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name: Belin, S.
name: Bellee, V.
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name: Belov, I.
name: Belyaev, I.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Berezhnoy, A.
name: Bernet, R.
name: Berninghoff, D.
name: Bernstein, H. C.
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name: Bertolin, A.
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name: Bifani, S.
name: Billoir, P.
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name: Bizzeti, A.
name: Bjørn, M.
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name: Blanc, F.
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name: Boelhauve, J. A.
name: Boente Garcia, O.
name: Boettcher, T.
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name: Carbone, A.
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name: Cardini, A.
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Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Regular Article - Experimental Physics
Charm physics
Hadron-Hadron scattering (experiments)
Branching fraction
QCD
Flavor physics

description: Abstract: A search for the doubly charmed baryon Ξcc+ is performed in the Ξc+π−π+ invariant-mass spectrum, where the Ξc+ 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 Ξcc++→ (Ξc+→ pK−π+)π+ decay for different Ξcc+ 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 Ξcc+→Λc+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.