Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻

LHCb Collaboration

Research School of High-Energy Physics

Research output: Contribution to journal › Article

Abstract

The decay Λ_b ⁰→Λ_c ⁺pp‾π⁻ is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb⁻¹. The ratio of branching fractions between Λ_b ⁰→Λ_c ⁺pp‾π⁻ and Λ_b ⁰→Λ_c ⁺π⁻ decays is measured to be [Formula presented]=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λ_c ⁺π⁻ mass spectrum of the Λ_b ⁰→Λ_c ⁺pp‾π⁻ decays, corresponding to the Σ_c(2455)⁰ and Σ_c ^⁎(2520)⁰ states. The ratios of branching fractions with respect to the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻ are [Formula presented]=0.089±0.015±0.006,[Formula presented]=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

Original language	English
Pages (from-to)	101-111
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	784
DOIs	https://doi.org/10.1016/j.physletb.2018.07.033
Publication status	Published - 10 Sep 2018

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decay

mass spectra

center of mass

luminosity

collisions

detectors

energy

ASJC Scopus subject areas

Nuclear and High Energy Physics

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LHCb Collaboration (2018). Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 784, 101-111. https://doi.org/10.1016/j.physletb.2018.07.033

Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻. / LHCb Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 784, 10.09.2018, p. 101-111.

Research output: Contribution to journal › Article

LHCb Collaboration 2018, 'Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 784, pp. 101-111. https://doi.org/10.1016/j.physletb.2018.07.033

LHCb Collaboration. Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 Sep 10;784:101-111. https://doi.org/10.1016/j.physletb.2018.07.033

LHCb Collaboration. / Observation of the decay Λ_b ⁰→Λ_c ⁺pp‾π⁻. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 ; Vol. 784. pp. 101-111.

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title = "Observation of the decay Λb 0→Λc +pp‾π−",

abstract = "The decay Λb 0→Λc +pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb 0→Λc +pp‾π− and Λb 0→Λc +π− decays is measured to be [Formula presented]=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λc +π− mass spectrum of the Λb 0→Λc +pp‾π− decays, corresponding to the Σc(2455)0 and Σc ⁎(2520)0 states. The ratios of branching fractions with respect to the decay Λb 0→Λc +pp‾π− are [Formula presented]=0.089±0.015±0.006,[Formula presented]=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d'Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and M. Atzeni and G. Auriemma and S. Bachmann and Back, {J. J.} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, {R. J.} and S. Barsuk and W. Barter and F. Baryshnikov and V. Batozskaya and V. Battista and A. Bay and J. Beddow and F. Bedeschi and A. Mazurov and A. Petrov and S. Strokov and A. Vagner",

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doi = "10.1016/j.physletb.2018.07.033",

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AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Auriemma, G.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Batozskaya, V.

AU - Battista, V.

AU - Bay, A.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Mazurov, A.

AU - Petrov, A.

AU - Strokov, S.

AU - Vagner, A.

PY - 2018/9/10

Y1 - 2018/9/10

N2 - The decay Λb 0→Λc +pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb 0→Λc +pp‾π− and Λb 0→Λc +π− decays is measured to be [Formula presented]=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λc +π− mass spectrum of the Λb 0→Λc +pp‾π− decays, corresponding to the Σc(2455)0 and Σc ⁎(2520)0 states. The ratios of branching fractions with respect to the decay Λb 0→Λc +pp‾π− are [Formula presented]=0.089±0.015±0.006,[Formula presented]=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

AB - The decay Λb 0→Λc +pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb 0→Λc +pp‾π− and Λb 0→Λc +π− decays is measured to be [Formula presented]=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λc +π− mass spectrum of the Λb 0→Λc +pp‾π− decays, corresponding to the Σc(2455)0 and Σc ⁎(2520)0 states. The ratios of branching fractions with respect to the decay Λb 0→Λc +pp‾π− are [Formula presented]=0.089±0.015±0.006,[Formula presented]=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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10.1016/j.physletb.2018.07.033