Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS - INSPIRE

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Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS

COMPASS

Collaboration

Mar 26, 2020

19 pages

Published in:

Phys.Lett.B 807 (2020) 135600,
Phys.Lett.B 807 (2020) 135600

Published: Jul 2, 2020
and
Published: Aug 10, 2020

e-Print:

2003.11791 [hep-ex]

DOI:

10.1016/j.physletb.2020.135600 (publication)

Report number:

CERN-EP-2020-041

Experiments:

CERN-SPS-NA58

View in:

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Abstract: (Elsevier B.V.)

The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, for the first time, for antiprotons and protons. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar ⁶LiD target. The regime of deep-inelastic scattering is ensured by requiring

Q^{2}

> 1 (GeV/c)² for the photon virtuality and

W > 5

GeV/

c^{2}

for the invariant mass of the produced hadronic system. Bjorken-x is restricted to the range 0.01 to 0.40. Protons and antiprotons are identified in the momentum range from 20 GeV/c to 60 GeV/c and required to carry a large fraction of the virtual-photon energy,

z > 0.5

. In the whole studied z-region, the

\bar{p}

over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Kaons were previously analysed in the momentum range 12 GeV/c to 40 GeV/c. In the present analysis this range is extended up to 55 GeV/c, whereby events with larger virtual-photon energies are included in the analysis and the observed K⁻ over K⁺ ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that at COMPASS energies the phase space available for single-hadron production in deep-inelastic scattering should be taken into account in the standard pQCD formalism.

Note:

19 pages, 7 figures, 3 tables

Quantum chromodynamics
pQCD
Deep-inelastic scattering
Hadron multiplicities
COMPASS
charged particle: multiplicity: measured
multiplicity: ratio
K+: multiplicity
K-: multiplicity
quantum chromodynamics: perturbation theory

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