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arXiv · 2405.12688

Study of $b$-hadron decays to $\mathit{\Lambda}_{c}^+ h^- h^{\prime -}$ final states

LHCb collaboration·R. Aaij·A. S. W. Abdelmotteleb·C. Abellan Beteta·F. Abudinén·T. Ackernley·A. A. Adefisoye·B. Adeva·M. Adinolfi·P. Adlarson·C. Agapopoulou·C. A. Aidala·Z. Ajaltouni·S. Akar·K. Akiba·P. Albicocco·J. Albrecht·F. Alessio·M. Alexander·Z. Aliouche·P. Alvarez Cartelle·R. Amalric·S. Amato·J. L. Amey·Y. Amhis·L. An·L. Anderlini·M. Andersson·A. Andreianov·P. Andreola·M. Andreotti·D. Andreou·A. Anelli·D. Ao·F. Archilli·M. Argenton·S. Arguedas Cuendis·A. Artamonov·M. Artuso·E. Aslanides·R. Ataide Da Silva·M. Atzeni·B. Audurier·D. Bacher·I. Bachiller Perea·S. Bachmann·M. Bachmayer·J. J. Back·P. Baladron Rodriguez·V. Balagura·W. Baldini·H. Bao·J. Baptista de Souza Leite·M. Barbetti·I. R. Barbosa·R. J. Barlow·M. Barnyakov·S. Barsuk·W. Barter·M. Bartolini·J. Bartz·J. M. Basels·G. Bassi·B. Batsukh·A. Bay·A. Beck·M. Becker·F. Bedeschi·I. B. Bediaga·S. Belin·V. Bellee·K. Belous·I. Belov·I. Belyaev·G. Benane·G. Bencivenni·E. Ben-Haim·A. Berezhnoy·R. Bernet·S. Bernet Andres·A. Bertolin·C. Betancourt·F. Betti·J. Bex·Ia. Bezshyiko·J. Bhom·M. S. Bieker·N. V. Biesuz·P. Billoir·A. Biolchini·M. Birch·F. C. R. Bishop·A. Bitadze·A. Bizzeti·T. Blake·F. Blanc·J. E. Blank·S. Blusk·V. Bocharnikov·J. A. Boelhauve
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Abstract

Decays of $\mathit{\Xi}_{b}^-$ and $\mathit{\Omega}_{b}^-$ baryons to $\mathit{\Lambda}_{c}^+ h^- h^{\prime -}$ final states, with $h^- h^{\prime -}$ being $\pi^-\pi^-$, $K^-\pi^-$ and $K^-K^-$ meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of $8.7\,\mathrm{fb}^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\sqrt{s} = 7$, $8$ and $13\,\mathrm{Te\kern -0.1em V}$. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the $B^- \to \mathit{\Lambda}_{c}^+ \overline{p} \pi^-$ mode, are measured, with $\mathit{\Xi}_{b}^- \to\mathit{\Lambda}_{c}^+ K^- \pi^-$, $\mathit{\Xi}_{b}^- \to\mathit{\Lambda}_{c}^+ K^- K^-$ and $\mathit{\Omega}_{b}^- \to\mathit{\Lambda}_{c}^+ K^- K^-$ decays being observed at over $5\,\sigma$ significance. The $\mathit{\Xi}_{b}^- \to\mathit{\Lambda}_{c}^+ K^- \pi^-$ mode is also used to measure the $\mathit{\Xi}_{b}^-$ production asymmetry, which is found to be consistent with zero. In addition, the $B^- \to \mathit{\Lambda}_{c}^+ \overline{p} K^-$ decay is observed for the first time, and its branching fraction is measured relative to that of the $B^- \to \mathit{\Lambda}_{c}^+ \overline{p} \pi^-$ mode.

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LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. Akar, K. Akiba, P. Albicocco, J. Albrecht, F. Alessio, M. Alexander, Z. Aliouche, P. Alvarez Cartelle, R. Amalric, S. Amato, J. L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, P. Andreola, M. Andreotti, D. Andreou, A. Anelli, D. Ao, F. Archilli, M. Argenton, S. Arguedas Cuendis, A. Artamonov, M. Artuso, E. Aslanides, R. Ataide Da Silva, M. Atzeni, B. Audurier, D. Bacher, I. Bachiller Perea, S. Bachmann, M. Bachmayer, J. J. Back, P. Baladron Rodriguez, V. Balagura, W. Baldini, H. Bao, J. Baptista de Souza Leite, M. Barbetti, I. R. Barbosa, R. J. Barlow, M. Barnyakov, S. Barsuk, W. Barter, M. Bartolini, J. Bartz, J. M. Basels, G. Bassi, B. Batsukh, A. Bay, A. Beck, M. Becker, F. Bedeschi, I. B. Bediaga, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Benane, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, S. Bernet Andres, A. Bertolin, C. Betancourt, F. Betti, J. Bex, Ia. Bezshyiko, J. Bhom, M. S. Bieker, N. V. Biesuz, P. Billoir, A. Biolchini, M. Birch, F. C. R. Bishop, A. Bitadze, A. Bizzeti, T. Blake, F. Blanc, J. E. Blank, S. Blusk, V. Bocharnikov, J. A. Boelhauve. 2024-05-21. Study of $b$-hadron decays to $\mathit{\Lambda}_{c}^+ h^- h^{\prime -}$ final states. https://doi.org/10.1007/jhep08(2024)132

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