Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS; Physics Letters B; Vol. 807
| Parent link: | Physics Letters B Vol. 807.— 2020.— [135600, 10 p.] |
|---|---|
| Autor corporatiu: | , |
| Altres autors: | , , , , , , |
| Sumari: | Title screen 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 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. |
| Idioma: | anglès |
| Publicat: |
2020
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| Matèries: | |
| Accés en línia: | https://doi.org/10.1016/j.physletb.2020.135600 |
| Format: | Electrònic Capítol de llibre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665753 |
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| 200 | 1 | |a Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS |f G. D. Alekseev, M. G. Alekseev, A. Amoroso [et al.] | |
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| 300 | |a Title screen | ||
| 320 | |a [References.: 34 tit.] | ||
| 330 | |a 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 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. | ||
| 461 | |t Physics Letters B | ||
| 463 | |t Vol. 807 |v [135600, 10 p.] |d 2020 | ||
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| 610 | 1 | |a deep-inelastic scattering | |
| 610 | 1 | |a hadron multiplicities | |
| 610 | 1 | |a COMPASS | |
| 610 | 1 | |a квантовая хромодинамика | |
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| 701 | 1 | |a Alekseev |b M. G. |g Maksim | |
| 701 | 1 | |a Amoroso |b A. | |
| 701 | 1 | |a Andrieux |b V. | |
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