Observation of Λb 0→ ψ(2S)pKand Λb 0→ J/ψπ+πpKdecays and a measurement of the Λb 0baryon mass

The Lhcb Collaboration

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Abstract: The decays Λb 0→ ψ(2S)pKand Λb 0→ J/ψπ+πpKare observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μand ψ(2S) → J/ψπ+π. The branching fractions relative to that of Λb 0→ J/ψpKare measured to beℬ(Λb 0→ψ(2S)pK)/ℬ(Λb 0→J/ψpK)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK)/ℬ(Λb 0→J/ψpK)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.

Original languageEnglish (US)
Article number132
JournalJournal of High Energy Physics
Volume2016
Issue number5
DOIs
StatePublished - May 1 2016

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protons
decay
center of mass
mesons
luminosity
collisions
detectors
energy

Keywords

  • B physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • Particle and resonance production
  • Spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Observation of Λb 0→ ψ(2S)pKand Λb 0→ J/ψπ+πpKdecays and a measurement of the Λb 0baryon mass. / The Lhcb Collaboration.

In: Journal of High Energy Physics, Vol. 2016, No. 5, 132, 01.05.2016.

Research output: Contribution to journalArticle

@article{a3df9839d3164b548f4d0e5d92cefcf8,
title = "Observation of Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−decays and a measurement of the Λb 0baryon mass",
abstract = "Abstract: The decays Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ−and ψ(2S) → J/ψπ+π−. The branching fractions relative to that of Λb 0→ J/ψpK−are measured to beℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.",
keywords = "B physics, Flavor physics, Hadron-Hadron scattering (experiments), Particle and resonance production, Spectroscopy",
author = "{The Lhcb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander 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 {Aquines Gutierrez}, O. and F. Archilli and P. d’Argent and A. Artamonov and M. Artuso and Marina Artuso and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and V. Battista and A. Bay and L. Beaucourt and J. Beddow and F. Bedeschi and I. Bediaga and Blusk, {Steven Roy} and Tomasz Skwarnicki and Sheldon Stone",
year = "2016",
month = "5",
day = "1",
doi = "10.1007/JHEP05(2016)132",
language = "English (US)",
volume = "2016",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
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TY - JOUR

T1 - Observation of Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−decays and a measurement of the Λb 0baryon mass

AU - The Lhcb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

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 - Aquines Gutierrez, O.

AU - Archilli, F.

AU - d’Argent, P.

AU - Artamonov, A.

AU - Artuso, M.

AU - Artuso, Marina

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Battista, V.

AU - Bay, A.

AU - Beaucourt, L.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Blusk, Steven Roy

AU - Skwarnicki, Tomasz

AU - Stone, Sheldon

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Abstract: The decays Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ−and ψ(2S) → J/ψπ+π−. The branching fractions relative to that of Λb 0→ J/ψpK−are measured to beℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.

AB - Abstract: The decays Λb 0→ ψ(2S)pK−and Λb 0→ J/ψπ+π−pK−are observed in a data sample corresponding to an integrated luminosity of 3 fb−1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ+μ−and ψ(2S) → J/ψπ+π−. The branching fractions relative to that of Λb 0→ J/ψpK−are measured to beℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb 0→ψ(2S)pK−)/ℬ(Λb 0→J/ψpK−)=(20.86±0.96±1.34)×10−2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λb 0baryon is measured to be M(Λb 0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.

KW - B physics

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

KW - Particle and resonance production

KW - Spectroscopy

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UR - http://www.scopus.com/inward/citedby.url?scp=84971421912&partnerID=8YFLogxK

U2 - 10.1007/JHEP05(2016)132

DO - 10.1007/JHEP05(2016)132

M3 - Article

AN - SCOPUS:84971421912

VL - 2016

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 5

M1 - 132

ER -