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.
Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton
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abstract
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.
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New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.
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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.
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Measurements of transverse-momentum dependent effects in semi-inclusive DIS at COMPASS
New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.