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

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dc.abstract.enThe 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 Q2 > 1 (GeV/c)2 for the photon virtuality and W>5 GeV/c2 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 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBadełek, Barbara
dc.contributor.authorJandek, M.
dc.contributor.authorPešek, M.
dc.contributor.authorJary, V.
dc.contributor.authorPeshekhonov, D.V.
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dc.contributor.authorMaggiora, A.
dc.contributor.authorTownsend, A.
dc.contributor.authorTskhay, V.
dc.contributor.authorAmoroso, A.
dc.contributor.authorAndrieux, V.
dc.contributor.authorTosello, F.
dc.contributor.authorVauth, A.
dc.contributor.authorVeit, B.M.
dc.contributor.authorUhl, S.
dc.contributor.authorVasilishin, B.I.
dc.contributor.authorVidon, A.
dc.contributor.authorVeloso, J.
dc.contributor.authorVentura, B.
dc.contributor.authorAnosov, V.
dc.contributor.authorAntoshkin, A.
dc.contributor.authorAugsten, K.
dc.contributor.authorAugustyniak, W.
dc.contributor.authorAzevedo, C.D.R.
dc.contributor.authorBalestra, F.
dc.contributor.authorBall, M.
dc.contributor.authorBarth, J.
dc.contributor.authorZhao, Y.
dc.contributor.authorZiembicki, M.
dc.contributor.authorZemko, M.
dc.contributor.authorZemlyanichkina, E.
dc.contributor.authorSuzuki, H.
dc.contributor.authorTessarotto, F.
dc.contributor.authorThiel, A.
dc.contributor.authorSznajder, P.
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dc.contributor.authorTomsa, J.
dc.date.accessioned2024-01-24T16:40:58Z
dc.date.available2024-01-24T16:40:58Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.volume807
dc.identifier.doi10.1016/J.PHYSLETB.2020.135600
dc.identifier.issn0370-2693
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100807
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.relation.pages1-10
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleAntiproton over proton and K− over K+ multiplicity ratios at high z in DIS
dc.typeJournalArticle
dspace.entity.typePublication