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K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy
- Source :
- Physics Letters B, Vol 786, Iss, Pp 390-398 (2018), Physics Letters B, Physics Letters B, Elsevier, 2018, 786, pp.390-398. ⟨10.1016/j.physletb.2018.09.052⟩, Phys.Lett.B, Phys.Lett.B, 2018, 786, pp.390-398. ⟨10.1016/j.physletb.2018.09.052⟩, Physics Letters, Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos), Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação, instacron:RCAAP, Physics letters / B 786, 390-398 (2018). doi:10.1016/j.physletb.2018.09.052
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD 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. Kaons are identified in the momentum range from 12 GeV/$c$ to 40 GeV/$c$, thereby restricting the range in Bjorken-$x$ to $0.010.75$. For very large values of $z$, $i.e.$ $z>0.8$, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.<br />Comment: 16 pages, 7 figures
- Subjects :
- Hadron
0 [higher-order]
target: isoscalar
01 natural sciences
COMPASS
deep inelastic scattering [muon+ nucleon]
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
K: multiplicity
High Energy Physics - Phenomenology (hep-ph)
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
isoscalar [target]
Invariant mass
Nuclear Experiment
Boson
Physics
Quantum chromodynamics
quark: fragmentation function
higher-order: 0
photon
perturbation theory: higher-order
hep-ph
мюоны
lcsh:QC1-999
Bjorken [scaling]
High Energy Physics - Phenomenology
beam [muon]
рассеяние
factorization [cross section]
multiplicity [pi]
Particle Physics - Experiment
perturbation theory [quantum chromodynamics]
Particle physics
Nuclear and High Energy Physics
Meson
FOS: Physical sciences
ratio [multiplicity]
fragmentation function [quark]
x-dependence
scaling: Bjorken
charged particle: multiplicity
phase space
multiplicity [charged particle]
[ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
виртуальные фотоны
0103 physical sciences
ddc:530
universality
quantum chromodynamics: perturbation theory
010306 general physics
Particle Physics - Phenomenology
muon+ nucleon: deep inelastic scattering
Muon
multiplicity: ratio
pi: multiplicity
010308 nuclear & particles physics
hep-ex
muon: beam
Multiplicity (mathematics)
cross section: factorization
CERN SPS
Deep inelastic scattering
higher-order [perturbation theory]
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
каоны
[ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
High Energy Physics::Experiment
multiplicity [K]
hadronization
lcsh:Physics
experimental results
Subjects
Details
- Language :
- English
- ISSN :
- 03702693
- Volume :
- 786
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi.dedup.....d571f2cc8db9632ed6a3dfd9dab5cf1a