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Measurement of the Υ production cross section in 920 GeV fixed-target proton–nucleus collisions

MPS-Authors
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Bauer,  C.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Braeuer,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Ehret,  K.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hofmann,  W.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Jagla,  T.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Knöpfle,  K. T.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Masciocchi,  S.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Pleier,  M. A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Pugatch,  V.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Reeves,  K.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Sanchez,  F.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Schwingenheuer,  B.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Sciacca,  F.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Spengler,  J.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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van Eldik,  C.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Agari,  Michaela
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., Aplin, S. J., et al. (2006). Measurement of the Υ production cross section in 920 GeV fixed-target proton–nucleus collisions. Physics Letters B, 638(1), 13-21. doi:http://dx.doi.org/10.1016/j.physletb.2006.04.042.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7FBB-0
Abstract
The cross section ratio RJ/ψ=Br(Υ→l+l−)dσ(Υ)/dy|y=0/σ(J/ψ) has been measured with the HERA-B spectrometer in fixed-target proton–nucleus collisions at 920 GeV proton beam energy corresponding to a proton–nucleon c.m.s. energy of √s=41.6 GeV. The combined results for the decay channels Υ→e+e− and Υ→μ+μ− yield a ratio RJ/ψ=(9.0±2.1)×10−6. The corresponding Υ production cross section per nucleon at mid-rapidity (y=0) has been determined to be Br(Υ→l+l−)dσ(Υ)/dy|y=0=4.5±1.1 pb/nucleon.