Počet záznamů: 1
Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS
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SYSNO ASEP 0533930 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS Tvůrce(i) Alexeev, G. D. (RU)
Alexeev, M. G. (IT)
Amoroso, A. (IT)
Srnka, Aleš (UPT-D) RID, ORCID, SAICelkový počet autorů 200 Číslo článku 135600 Zdroj.dok. Physics Letters. B. - : Elsevier - ISSN 0370-2693
Roč. 807, AUG (2020)Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova quantum chromodynamics ; pQCD ; deep-inelastic scattering ; hadron multiplicities ; compass Vědní obor RIV BJ - Termodynamika Obor OECD Particles and field physics Způsob publikování Open access Institucionální podpora UPT-D - RVO:68081731 UT WOS 000571765700068 EID SCOPUS 85087686810 DOI 10.1016/j.physletb.2020.135600 Anotace 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 (LiD)-Li-6 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 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. (C) 2020 Published by Elsevier B.V. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0370269320304044
Počet záznamů: 1