Observation of the decay Λ b 0 → χ c1 pπ −
Creators: name: Aaij, R.
name: Abellán Beteta, C.
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Afsharnia, H.
name: Aidala, C. A.
name: Aiola, S.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Alfonso Albero, A.
name: Aliouche, Z.
name: Alkhazov, G.
name: Alvarez Cartelle, P.
name: Amato, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreianov, A.
name: Andreotti, M.
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Arzymatov, K.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bachmann, S.
name: Bachmayer, M.
name: Back, J. J.
name: Baladron Rodriguez, P.
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name: Baldini, W.
name: Baptista Leite, J.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
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name: Baryshnikov, F.
name: Basels, J. M.
name: Bassi, G.
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name: Belavin, V.
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name: Bellee, V.
name: Belous, K.
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.
name: Bertella, C.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bezshyiko, Ia.
name: Bhasin, S.
name: Bhom, J.
name: Bian, L.
name: Bieker, M. S.
name: Bifani, S.
name: Billoir, P.
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name: Bjørn, M.
name: Blago, M. P.
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name: Bobulska, D.
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name: Boente Garcia, O.
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Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Regular Article - Experimental Physics
B physics
Branching fraction
Hadron-Hadron scattering (experiments)
QCD
Quarkonium

description: Abstract: The Cabibbo-suppressed decay Λb0→ χc1pπ− is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λb0→ χc2pπ− decay is also found. Using the Λb0→ χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to beBΛb0→χc1pπ−BΛb0→χc1pK−=6.59±1.01±0.22×10−2, BΛb0→χc2pπ−BΛb0→χc1pπ−=0.95±0.30±0.04±0.04, BΛb0→χc2pK−BΛb0→χc1pK−=1.06±0.05±0.04±0.04, where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1, 2→ J/ψγ decays.