First observation and branching fraction measurement of the Λ b 0 → D s − p $$ {\Lambda}_b^0\to {D}_s^{-}p $$ decay

• Published in: The journal of high energy physics 2023-07, Vol.2023 (7), p.1-23
• Main Authors: The LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, B. Adeva, M. Adinolfi, P. Adlarson, H. Afsharnia, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. Akar, K. Akiba, P. Albicocco, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, P. Alvarez Cartelle, R. Amalric, S. Amato, J. L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, M. Andreotti, D. Andreou, D. Ao, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, B. Audurier, I. B Bachiller Perea, S. Bachmann, M. Bachmayer, J. J. Back, A. Bailly-reyre, P. Baladron Rodriguez, V. Balagura, W. Baldini, J. Baptista de Souza Leite, M. Barbetti, R. J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, A. Beck, M. Becker, F. Bedeschi, I. B. Bediaga, A. Beiter, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Benane, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, S. Bernet Andres, D. Berninghoff, H. C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, Ia. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. S. Bieker, N. V. Biesuz, P. Billoir, A. Biolchini, M. Birch, F. C. R. Bishop, A. Bitadze, A. Bizzeti, M. P. Blago, T. Blake, F. Blanc, J. E. Blank, S. Blusk, D. Bobulska, J. A. Boelhauve
• Format: Article
• Language: English
• Subjects: B Physics; Branching fraction; Flavour Physics; Hadron-Hadron Scattering
• ISSN: 1029-8479
• DOI: 10.1007/JHEP07(2023)075

Abstract The first observation of the Λ b 0 → D s − p $$ {\Lambda}_b^0\to {D}_s^{-}p $$ decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of s $$ \sqrt{s} $$ = 13 TeV, corresponding to a total integrated luminosity of 6 fb −1. Using the Λ b 0 → Λ c + π − $$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} $$ decay as the normalisation mode, the branching fraction of the Λ b 0 → D s − p $$ {\Lambda}_b^0\to {D}_s^{-}p $$ decay is measured to be B Λ b 0 → D s − p = 12.6 ± 0.5 ± 0.3 ± 1.2 × 10 − 6 $$ \mathcal{B}\left({\Lambda}_b^0\to {D}_s^{-}p\right)=\left(12.6\pm 0.5\pm 0.3\pm 1.2\right)\times {10}^{-6} $$ , where the first uncertainty is statistical, the second systematic and the third due to uncertainties in the branching fractions of the Λ b 0 → Λ c + π − $$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} $$ , D s − → K − K + π − $$ {D}_s^{-}\to {K}^{-}{K}^{+}{\pi}^{-} $$ and Λ c + → p K − π + $$ {\Lambda}_c^{+}\to p{K}^{-}{\pi}^{+} $$ decays.