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Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron

A. Airapetian et al. (HERMES Collaboration)
Phys. Rev. D 87, 074029 – Published 23 April 2013
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Abstract
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  • INTRODUCTION
  • THE EXPERIMENT
  • DATA ANALYSIS
  • HADRON MULTIPLICITIES
  • COMPARISON OF MULTIPLICITIES WITH LO…
  • SUMMARY
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of π± and K± mesons. The data were collected by the HERMES experiment at the HERA storage ring using 27.6 GeV electron and positron beams incident on a hydrogen or deuterium gas target. The results are presented as a function of the kinematic quantities xB, Q2, z, and Ph⊥. They represent a unique data set for identified hadrons that will significantly enhance our understanding of the fragmentation of quarks into final-state hadrons in deep-inelastic scattering.

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    • Received 27 December 2012

    DOI:https://doi.org/10.1103/PhysRevD.87.074029

    © 2013 American Physical Society

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    Vol. 87, Iss. 7 — 1 April 2013

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    Images

    • Figure 1
      Figure 1

      Schematic view of the HERMES spectrometer.

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    • Figure 2
      Figure 2

      Born space in (x,Q2) for the multiplicities extracted.

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    • Figure 3
      Figure 3

      Fraction of mesons generated by the decay of exclusive vector mesons as a function of z, from pythia (see text). The widths of the bands indicate the uncertainty in the corresponding fractions. The vertical dashed lines are the limits in z used in the multiplicity extractions.

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    • Figure 4
      Figure 4

      Multiplicities corrected for exclusive vector mesons as a function of z from a hydrogen target (full circles) and a deuterium target (empty squares). Error bars for the statistical uncertainties are too small to be visible. The systematic uncertainties are given by the error bands.

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    • Figure 5
      Figure 5

      Comparison of measured Born multiplicities for a proton target with and without the correction for exclusive vector mesons as a function of z. The open (closed) circles include (exclude) exclusive vector meson production. The statistical error bars are too small to be visible. Also shown (bottom panels) are the ratios of these multiplicities.

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    • Figure 6
      Figure 6

      The asymmetry Ad−ph as defined in Eq. (7) as a function of z, for the multiplicities shown in Fig. 4. The values given by an LO calculation using fragmentation functions from DSS [22] and parton distributions from CTEQ6L [45] are given by the solid curves.

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    • Figure 7
      Figure 7

      The asymmetry Ad−ph as defined in Eq. (7) as a function of xB, for the pion multiplicities shown in Fig. 8. The statistical uncertainty is shown by the error bars, while the systematic uncertainty is given by the error bands.

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    • Figure 8
      Figure 8

      Multiplicities of pions (left panels) and kaons (right panels) for the proton and the deuteron as a function of Ph⊥, xB, and Q2 in four z bins. Positive charge is on the left and negative charge is on the right of each panel. Uncertainties are as in Fig. 4.

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    • Figure 9
      Figure 9

      Comparison of the vector-meson-corrected multiplicities measured on the proton for various hadrons with LO calculations using CTEQ6L parton distributions [45] and three compilations (see text) of fragmentation functions. Also shown are the values obtained from the HERMES Lund Monte Carlo. The statistical error bars on the experimental points are too small to be visible.

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    • Figure 10
      Figure 10

      As in Fig. 9 but for deuterons.

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