I. A. Savin

Double $J/ψ$ production in pion-nucleon scattering at COMPASS

G. D. Alexeev, M. G. Alexeev, A. Amoroso, V. Andrieux et autres

We present the study of the production of double $J/ψ$ mesons using COMPASS data collected with a 190 GeV/$c$ $π^-$ beam scattering off NH$_{3}$, Al and W targets. Kinematic distributions of the collected double $J/ψ$ events are analysed, and the double $J/ψ$ …

Spin density matrix elements in exclusive $$\omega $$ meson muoproduction

G. D. Alexeev, M. Alexeev, A. Amoroso, V. Andrieux et autres

Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ ω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ μ + and $$ \mu ^{-}$$ μ - beams impinging …

ru, it, us, ch, cz, pl, pt, de, fr, tw, jp (code pays fourni par la source)

Light isovector resonances in π−p→π−π−π+p at 190 GeV/c

M. Aghasyan, M. Alexeev, G. D. Alexeev, A. Amoroso et autres

We have performed the most comprehensive resonance-model fit of ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}+{p}_{\text{recoil}}$ with a $190\text{ }\text{ }\mathrm{GeV}/c$ pion beam. The PWA …

it, ru, us, fr, cz, pl, de, pt, ch, tw, jp (code pays fourni par la source)

Azimuthal asymmetries of charged hadrons produced by high-energy muons scattered off longitudinally polarised deuterons

M. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov, G. D. Alexeev et autres

Azimuthal asymmetries in semi-inclusive production of positive (h +) and negative hadrons (h −) have been measured by scattering 160 GeV muons off longitudinally polarised deuterons at CERN. The asymmetries were decomposed in several terms according to their expected modulation in the …

it, ru, de, ch, pl, fr, pt, jp, cz (code pays fourni par la source)

The QCD Analysis Of The World Data On Structure Functions g[sub 1][sup p,d,n] For Proton, Deuteron And Neutron

I. A. Savin

The fits of all published data on g1, including the new COMPASS measurements of g1d(x,Q2), have been performed by using two different QCD evolution formalisms in the next‐to‐leading‐order (NLO) approximation. In both methods we obtain two solutions for fitted parameters of the …

First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-inclusive Deep Inelastic Scattering

V. Alexakhin, Yu. Alexandrov, G. D. Alexeev, A. Amoroso et autres

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN …

ru, it, pl, fr, de, fi, in, jp, ch (code pays fourni par la source)