Observation and branching fraction measurement of the decay $Ξ_b^-\toΛ_b^0π^-$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Abdelmotteleb, A. S. W.
name: Beteta, C. Abellan
name: Abudinén, F.
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Adlarson, P.
name: Afsharnia, H.
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: Albero, A. Alfonso
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.
name: Ao, D.
name: Archilli, F.
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.
name: Bachmayer, M.
name: Back, J. J.
name: Bailly-reyre, A.
name: Rodriguez, P. Baladron
name: Balagura, V.
name: Baldini, W.
name: Leite, J. Baptista de Souza
name: Barbetti, M.
name: Barbosa, I. R.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Bartolini, M.
name: Baryshnikov, F.
name: Basels, J. M.
name: Bassi, G.
name: Batsukh, B.
name: Battig, A.
name: Bay, A.
name: Beck, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I. B.
name: Beiter, A.
name: Belin, S.
name: Bellee, V.
name: Belous, K.
name: Belov, I.
name: Belyaev, I.
name: Benane, G.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Berezhnoy, A.
name: Bernet, R.
name: Andres, S. Bernet
name: Berninghoff, D.
name: Bernstein, H. C.
name: Bertella, C.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bex, J.
name: Bezshyiko, Ia.
name: Bhom, J.
name: Bian, L.
name: Bieker, M. S.
name: Biesuz, N. V.
name: Billoir, P.
name: Biolchini, A.
name: Birch, M.
name: Bishop, F. C. R.
name: Bitadze, A.
name: Bizzeti, A.
name: Blago, M. P.
name: Blake, T.
name: Blanc, F.
name: Blank, J. E.
name: Blusk, S.
name: Bobulska, D.
name: Bocharnikov, V.
name: Boelhauve, J. A.
name: Garcia, O. Boente
name: Boettcher, T.
name: Bohare, A.
name: Boldyrev, A.
name: Bolognani, C. S.
name: Bolzonella, R.
name: Bondar, N.
name: Borgato, F.
name: Borghi, S.
name: Borsato, M.
name: Borsuk, J. T.
name: Bouchiba, S. A.
name: Bowcock, T. J. V.
name: Boyer, A.
name: Bozzi, C.
name: Bradley, M. J.
name: Braun, S.
name: Rodriguez, A. Brea
name: Breer, N.
name: Brodzicka, J.
name: Gonzalo, A. Brossa
name: Brown, J.
name: Brundu, D.
name: Buonaura, A.
name: Buonincontri, L.
name: Burke, A. T.
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name: Bursche, A.
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name: Gomez, M. Calvo
name: Bouzas, J. Cambon
name: Campana, P.
name: Perez, D. H. Campora
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name: Salgado, L. Carcedo
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name: Charles, M.
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name: Chen, S.
name: Chernov, A.
name: Chernyshenko, S.
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name: Chubykin, A.
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Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The decay $Ξ_b^-\toΛ_b^0π^-$ is observed using a proton-proton collision data sample collected at center-of-mass energy $\sqrt{s}=13$ TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb$^{-1}$. This process is mediated by the $s\to u\bar{u}d$ quark-level transition, where the $b$ quark in the $Ξ_b^-$ baryon is a spectator in the decay. Averaging the results obtained using the two $Λ_b^0$ decay modes, $Λ_b^0\toΛ_c^+π^-$ and $Λ_b^0\toΛ_c^+π^-π^+π^-$, the relative production ratio is measured to be $(f_{Ξ_b^-}/f_{Λ_b^0}){\cal{B}}(Ξ_b^-\toΛ_b^0π^-)=(7.3\pm0.8\pm0.6)\times10^{-4}$. Here the uncertainties are statistical and systematic, respectively, and $f_{Ξ_b^-}(f_{Λ_b^0})$ is the fragmentation fraction for a $b$ quark into a $Ξ_b^-$ ($Λ_b^0$) baryon. Using an independent measurement of $f_{Ξ_b^-}/f_{Λ_b^0}$, the branching fraction ${\cal{B}}(Ξ_b^-\toΛ_b^0π^-)=(0.89\pm0.10\pm0.07\pm0.29)\%$ is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of $f_{Ξ_b^-}/f_{Λ_b^0}$.
description: 14 pages, 4 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-015.html (LHCb public pages)