Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Affolder, A.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Anderson, J.
name: Andreassen, R.
name: Andreotti, M.
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name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Băbeanu, A.
name: Bachmann, S.
name: Back, J. J.
name: Badalov, A.
name: Balagura, V.
name: Baldini, W.
name: Barlow, R. J.
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name: Batozskaya, V.
name: Battista, V.
name: Bay, A.
name: Beaucourt, L.
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name: Bencivenni, G.
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name: Bernet, R.
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name: Bird, T.
name: Bizzeti, A.
name: Bjørnstad, P. M.
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name: Blanc, F.
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name: Bocci, V.
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name: Borsato, M.
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name: Bozzi, C.
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name: Brand, J. van den
name: Bressieux, J.
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name: Calvi, M.
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name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
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name: Garcia, L. Castillo
name: Cattaneo, M.
name: Cauet, Ch.
name: Cenci, R.
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name: Charpentier, Ph.
name: Chen, S.
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name: Chrzaszcz, M.
name: Ciba, K.
name: Vidal, X. Cid
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Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The first observation of the Cabibbo-suppressed decay $Λ_b^0\rightarrow J/ψp π^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative to the decay mode $Λ_b^0\rightarrow J/ψp K^-$ is determined to be $$ \frac{{\cal B}(Λ_b^0\rightarrow J/ψp π^-)}{{\cal B}(Λ_b^0\rightarrow J/ψp K^-)}=0.0824\pm0.0025\:(\text{stat})\pm0.0042\:(\text{syst}). $$ A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be $$ {\cal A}_{CP}(Λ_b^0\rightarrow J/ψp π^-)-{\cal A}_{CP}(Λ_b^0\rightarrow J/ψp K^-)=(+5.7\pm 2.4\:(\text{stat})\pm1.2\:(\text{syst}))\%, $$ which is compatible with CP symmetry at the $2.2σ$ level.