Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses

LHCb collaboration

doi:10.1103/PhysRevLett.110.182001

Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses

LHCb collaboration

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Lambda(0)(b) -> J/psi Lambda, Xi(-)(b) -> J/psi Xi(-) and Omega(-)(b) -> J/psi Omega(-) signals are observed and the corresponding masses are measured to be M(Lambda(0)(b)) = 5619.53 +/- 0.13(stat.) +/- 0.45(syst.) MeV/c(2), M(Xi(-)(b)) = 5795.8 +/- 0.9(stat.) +/- 0.4(syst.) MeV/c(2), M(Omega(-)(b)) = 6046.0 +/- 2-2(stat.) +/- 0.5(syst.) MeV/c(2), while the differences with respect to the Lambda(0)(b) mass are M(Xi(-)(b)) - M(Lambda(0)(b)) = 176.2+/-0.9(stat.) +/- 0.1(syst.) MeV/c(2), M(Omega(-)(b)) - M(Lambda(0)(b)) = 426.4 +/- 2.2(stat.) +/-0.4(syst.) MeV/c(2). These are the most precise mass measurements of the Lambda(0)(b), Xi(-)(b) and Omega(-)(b) baryons to date. Averaging the above Lambda(0)(b) mass measurement with that published by LHCb using 35 pb(-1) of data collected in 2010 yields M(Lambda(0)(b)) = 5619.44 +/- 0.13(stat.) +/- 0.38(syst.) MeV/c(2).

Original language	English
Article number	182001
Number of pages	8
Journal	Physical Review Letters
Volume	110
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.110.182001
Publication status	Published - 2 May 2013
Externally published	Yes

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@article{febe8645bdfe4b7c90522c9123dc9bd6,

title = "Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses",

abstract = "Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Lambda(0)(b) -> J/psi Lambda, Xi(-)(b) -> J/psi Xi(-) and Omega(-)(b) -> J/psi Omega(-) signals are observed and the corresponding masses are measured to be M(Lambda(0)(b)) = 5619.53 +/- 0.13(stat.) +/- 0.45(syst.) MeV/c(2), M(Xi(-)(b)) = 5795.8 +/- 0.9(stat.) +/- 0.4(syst.) MeV/c(2), M(Omega(-)(b)) = 6046.0 +/- 2-2(stat.) +/- 0.5(syst.) MeV/c(2), while the differences with respect to the Lambda(0)(b) mass are M(Xi(-)(b)) - M(Lambda(0)(b)) = 176.2+/-0.9(stat.) +/- 0.1(syst.) MeV/c(2), M(Omega(-)(b)) - M(Lambda(0)(b)) = 426.4 +/- 2.2(stat.) +/-0.4(syst.) MeV/c(2). These are the most precise mass measurements of the Lambda(0)(b), Xi(-)(b) and Omega(-)(b) baryons to date. Averaging the above Lambda(0)(b) mass measurement with that published by LHCb using 35 pb(-1) of data collected in 2010 yields M(Lambda(0)(b)) = 5619.44 +/- 0.13(stat.) +/- 0.38(syst.) MeV/c(2).",

author = "R. Aaij and C.A. Beteta and A. Adametz and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and P.A. Cartelle and A.A. Alves and S. Amato and Y. Amhis and L. Anderlini and J. Anderson and R. Andreassen and R.B. Appleby and O.A. Gutierrez and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and J.J. Back and C. Baesso and V. Balagura and W. Baldini and R.J. Barlow and C. Barschel and S. Barsuk and W. Barter and T. Bauer and A. Bay and J. Beddow and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and A. Berezhnoy and \{van den Brand\}, J. and \{LHCb collaboration\}",

year = "2013",

month = may,

day = "2",

doi = "10.1103/PhysRevLett.110.182001",

language = "English",

volume = "110",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "18",

}

TY - JOUR

T1 - Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses

AU - Aaij, R.

AU - Beteta, C.A.

AU - Adametz, A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adrover, C.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Cartelle, P.A.

AU - Alves, A.A.

AU - Amato, S.

AU - Amhis, Y.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, R.

AU - Appleby, R.B.

AU - Gutierrez, O.A.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Bachmann, S.

AU - Back, J.J.

AU - Baesso, C.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R.J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Bauer, T.

AU - Bay, A.

AU - Beddow, J.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Belous, K.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Benayoun, M.

AU - Bencivenni, G.

AU - Benson, S.

AU - Benton, J.

AU - Berezhnoy, A.

AU - van den Brand, J.

AU - LHCb collaboration

PY - 2013/5/2

Y1 - 2013/5/2

N2 - Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Lambda(0)(b) -> J/psi Lambda, Xi(-)(b) -> J/psi Xi(-) and Omega(-)(b) -> J/psi Omega(-) signals are observed and the corresponding masses are measured to be M(Lambda(0)(b)) = 5619.53 +/- 0.13(stat.) +/- 0.45(syst.) MeV/c(2), M(Xi(-)(b)) = 5795.8 +/- 0.9(stat.) +/- 0.4(syst.) MeV/c(2), M(Omega(-)(b)) = 6046.0 +/- 2-2(stat.) +/- 0.5(syst.) MeV/c(2), while the differences with respect to the Lambda(0)(b) mass are M(Xi(-)(b)) - M(Lambda(0)(b)) = 176.2+/-0.9(stat.) +/- 0.1(syst.) MeV/c(2), M(Omega(-)(b)) - M(Lambda(0)(b)) = 426.4 +/- 2.2(stat.) +/-0.4(syst.) MeV/c(2). These are the most precise mass measurements of the Lambda(0)(b), Xi(-)(b) and Omega(-)(b) baryons to date. Averaging the above Lambda(0)(b) mass measurement with that published by LHCb using 35 pb(-1) of data collected in 2010 yields M(Lambda(0)(b)) = 5619.44 +/- 0.13(stat.) +/- 0.38(syst.) MeV/c(2).

AB - Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Lambda(0)(b) -> J/psi Lambda, Xi(-)(b) -> J/psi Xi(-) and Omega(-)(b) -> J/psi Omega(-) signals are observed and the corresponding masses are measured to be M(Lambda(0)(b)) = 5619.53 +/- 0.13(stat.) +/- 0.45(syst.) MeV/c(2), M(Xi(-)(b)) = 5795.8 +/- 0.9(stat.) +/- 0.4(syst.) MeV/c(2), M(Omega(-)(b)) = 6046.0 +/- 2-2(stat.) +/- 0.5(syst.) MeV/c(2), while the differences with respect to the Lambda(0)(b) mass are M(Xi(-)(b)) - M(Lambda(0)(b)) = 176.2+/-0.9(stat.) +/- 0.1(syst.) MeV/c(2), M(Omega(-)(b)) - M(Lambda(0)(b)) = 426.4 +/- 2.2(stat.) +/-0.4(syst.) MeV/c(2). These are the most precise mass measurements of the Lambda(0)(b), Xi(-)(b) and Omega(-)(b) baryons to date. Averaging the above Lambda(0)(b) mass measurement with that published by LHCb using 35 pb(-1) of data collected in 2010 yields M(Lambda(0)(b)) = 5619.44 +/- 0.13(stat.) +/- 0.38(syst.) MeV/c(2).

U2 - 10.1103/PhysRevLett.110.182001

DO - 10.1103/PhysRevLett.110.182001

M3 - Article

SN - 0031-9007

VL - 110

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

M1 - 182001

ER -

Measurement of the Lambda(0)(b), Xi(-)(b), and Omega(-)(b) Baryon Masses

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