StringSpinner 2.0 implements propagation of spin correlations from a user-defined joint q qbar density matrix in PYTHIA for e+e- to hadrons, demonstrated via Collins asymmetry calculations for back-to-back pions.
A high-statistics measurement of transverse spin effects in dihadron production from muon-proton semi-inclusive deep-inelastic scattering
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abstract
A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH$_{3}$) targets are presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year $2010$ with the COMPASS spectrometer using a $160\,\mbox{GeV}/c$ muon beam of the CERN SPS, increasing by a factor of about three the available statistics of the previously published data taken in the year $2007$. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation.
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StringSpinner 2.0: Enabling quark spin effects in PYTHIA for $e^+e^-$ annihilation
StringSpinner 2.0 implements propagation of spin correlations from a user-defined joint q qbar density matrix in PYTHIA for e+e- to hadrons, demonstrated via Collins asymmetry calculations for back-to-back pions.