TY - JOUR
T1 - Measurement of the branching fraction of the Λb0→J/ψΛ decay and isospin asymmetry of B → J/ψK decays
AU - The LHCb collaboration
AU - Aaij, R.
AU - Abdelmotteleb, A. S.W.
AU - Abellan Beteta, C.
AU - Abudinén, F.
AU - Ackernley, T.
AU - Adefisoye, A. A.
AU - Adeva, B.
AU - Adinolfi, M.
AU - Adlarson, P.
AU - Agapopoulou, C.
AU - Aidala, C. A.
AU - Ajaltouni, Z.
AU - Akar, S.
AU - Akiba, K.
AU - Akthar, M.
AU - Albicocco, P.
AU - Albrecht, J.
AU - Aleksiejunas, R.
AU - Alessio, F.
AU - Alvarez Cartelle, P.
AU - Amalric, R.
AU - Amato, S.
AU - Amey, J. L.
AU - Amhis, Y.
AU - An, L.
AU - Anderlini, L.
AU - Andersson, M.
AU - Andreola, P.
AU - Andreotti, M.
AU - Andres Estrada, S.
AU - Anelli, A.
AU - Ao, D.
AU - Arata, C.
AU - Archilli, F.
AU - Areg, Z.
AU - Argenton, M.
AU - Arguedas Cuendis, S.
AU - Arnone, L.
AU - Artamonov, A.
AU - Artuso, M.
AU - Aslanides, E.
AU - Ataíde Da Silva, R.
AU - Atzeni, M.
AU - Audurier, B.
AU - Authier, J. A.
AU - Bacher, D.
AU - Bachiller Perea, I.
AU - Bachmann, S.
AU - Bachmayer, M.
AU - Calderon Ramirez, S.
N1 - Publisher Copyright:
© The Author(s) 2026.
PY - 2026/1
Y1 - 2026/1
N2 - This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb−1. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28×10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B+→ J/ψK+ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.
AB - This paper describes a measurement of the Λb0→J/ψΛ branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb−1. The branching fraction is determined relative to that of B0→J/ψKS0 decays, (Formula presented.) yielding BΛb0→J/ψΛ=3.34±0.02±0.10±0.08±0.28×10−4, where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Λb0 baryon and B0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B0→J/ψKS0 and B+→ J/ψK+ decays is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.
KW - B Physics
KW - Branching fraction
KW - Flavour Physics
KW - Hadron-Hadron Scattering
UR - https://www.scopus.com/pages/publications/105032111418
U2 - 10.1007/JHEP01(2026)159
DO - 10.1007/JHEP01(2026)159
M3 - Artículo
AN - SCOPUS:105032111418
SN - 1029-8479
VL - 2026
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 1
M1 - 159
ER -