Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb^−1 of data collected in 2011 with the LHCb detector. Significant Λb0 → J/ψ Λ, Ξb- → J/ψ Ξ− and Ωb− → J/ψ Ω− signals are observed and the corresponding masses are measured to be M(Λb0) = 5619.53 ± 0.13(stat.) ± 0.45(syst.) MeV/c2, M(Ξb−) = 5795.8 ± 0.9(stat.) ± 0.4(syst.) MeV/c2, M(Ωb−) = 6046.0 ± 2.2(stat.) ± 0.5(syst.) MeV/c2, while the differences with respect to the Λb0 mass are M(Ξb−) − M(Λb0) = 176.2 ± 0.9(stat.) ± 0.1(syst.) MeV/c2, M(Ωb−) − M(Λb0) = 426.4 ± 2.2(stat.) ± 0.4(syst.) MeV/c2. These are the most precise mass measurements of the Λb0, Ξb− and Ωb− baryons to date. Averaging the above Λb0 mass measurement with that published by LHCb using 35 pb^−1 of data collected in 2010 yields M(Λb0) = 5619.44 ± 0.13(stat.) ± 0.38(syst.) MeV/c2.

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2013). Measurement of the Λb0, Ξb−, and Ωb− Baryon Masses. PHYSICAL REVIEW LETTERS, 110(18), 1-8 [10.1103/PhysRevLett.110.182001].

Measurement of the Λb0, Ξb−, and Ωb− Baryon Masses

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb^−1 of data collected in 2011 with the LHCb detector. Significant Λb0 → J/ψ Λ, Ξb- → J/ψ Ξ− and Ωb− → J/ψ Ω− signals are observed and the corresponding masses are measured to be M(Λb0) = 5619.53 ± 0.13(stat.) ± 0.45(syst.) MeV/c2, M(Ξb−) = 5795.8 ± 0.9(stat.) ± 0.4(syst.) MeV/c2, M(Ωb−) = 6046.0 ± 2.2(stat.) ± 0.5(syst.) MeV/c2, while the differences with respect to the Λb0 mass are M(Ξb−) − M(Λb0) = 176.2 ± 0.9(stat.) ± 0.1(syst.) MeV/c2, M(Ωb−) − M(Λb0) = 426.4 ± 2.2(stat.) ± 0.4(syst.) MeV/c2. These are the most precise mass measurements of the Λb0, Ξb− and Ωb− baryons to date. Averaging the above Λb0 mass measurement with that published by LHCb using 35 pb^−1 of data collected in 2010 yields M(Λb0) = 5619.44 ± 0.13(stat.) ± 0.38(syst.) MeV/c2.
2013
R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2013). Measurement of the Λb0, Ξb−, and Ωb− Baryon Masses. PHYSICAL REVIEW LETTERS, 110(18), 1-8 [10.1103/PhysRevLett.110.182001].
R. Aaij; C. Abellan Beteta; A. Adametz; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/136200
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