First observation of $Λ_{b}^{0} \rightarrow Σ_c^{(*)++} D^{(*)-} K^{-}$ decays
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Abdelmotteleb, A. S. W.
name: Beteta, C. Abellan
name: Abudinén, F.
name: Ackernley, T.
name: Adefisoye, A. A.
name: Adeva, B.
name: Adinolfi, M.
name: Adlarson, P.
name: Agapopoulou, C.
name: Aidala, C. A.
name: Ajaltouni, Z.
name: Akar, S.
name: Akiba, K.
name: Albicocco, P.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Aliouche, Z.
name: Cartelle, P. Alvarez
name: Amalric, R.
name: Amato, S.
name: Amey, J. L.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andersson, M.
name: Andreianov, A.
name: Andreola, P.
name: Andreotti, M.
name: Andreou, D.
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name: Ao, D.
name: Archilli, F.
name: Argenton, M.
name: Cuendis, S. Arguedas
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bacher, D.
name: Perea, I. Bachiller
name: Bachmann, S.
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name: Rodriguez, P. Baladron
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name: Baldini, W.
name: Leite, J. Baptista de Souza
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name: Basels, J. M.
name: Bassi, G.
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name: Battig, A.
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name: Beck, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I. B.
name: Beiter, A.
name: Belin, S.
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name: Belous, K.
name: Belov, I.
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Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The four decays, $Λ_{b}^{0} \rightarrow Σ_c^{(*)++} D^{(*)-} K^{-}$, are observed for the first time using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of $13\,\rm{TeV}$, corresponding to an integrated luminosity of $6\,\rm{fb}^{-1}$. By considering the $Λ_b^0 \rightarrow Λ_c^{+} \overline{D}^0 K^{-}$ decay as reference channel, the following branching fraction ratios are measured to be
 $$\frac{\cal{B} (Λ_{b}^{0} \rightarrow Σ_{c}^{++} \rm{D}^{-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Λ_c^{+} \rm \overline{D}^0 {K}^{-})}
 = {0.282}\pm{0.016}\pm{0.016}\pm{0.005},
 \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{*++} \rm {D}^{-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm {D}^{-} {K}^{-})}
 = {0.460}\pm{0.052}\pm{0.028},
 \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{++} \rm {D}^{*-} {K}^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm {D}^{-} {K}^{-})}
 = {2.261}\pm{0.202}\pm{0.129}\pm{0.046},
 \frac{\cal{B}(Λ_{b}^{0} \rightarrow Σ_{c}^{*++} \rm D^{*-} K^{-})}{\cal{B}(Λ_{b}^{0} \rightarrow Σ_c^{++} \rm D^{-} K^{-})}
 = {0.896}\pm{0.137}\pm{0.066}\pm{0.018},$$
 where the first uncertainties are statistical, the second are systematic, and the third are due to uncertainties in the branching fractions of intermediate particle decays. These initial observations mark the beginning of pentaquark searches in these modes, with more data set to become available following the LHCb upgrade.
description: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-044.html (LHCb public pages)