Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS; Physics Letters B; Vol. 807

Antiproton over proton and K- over K+ multiplicity ratios at high z in DIS; Physics Letters B; Vol. 807

Dettagli Bibliografici
Parent link:Physics Letters B
Vol. 807.— 2020.— [135600, 10 p.]
Enti autori: Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики, Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Altri autori: Alekseev G. D. Gennady, Alekseev M. G. Maksim, Amoroso A., Andrieux V., Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich
Riassunto: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.
Lingua:inglese
Pubblicazione: 2020
Soggetti:
электронный ресурс
труды учёных ТПУ
quantum chromodynamics
pQCD
deep-inelastic scattering
hadron multiplicities
COMPASS
квантовая хромодинамика
глубоконеупругое рассеяние
множественность
Accesso online:https://doi.org/10.1016/j.physletb.2020.135600
Natura: Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665753

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