Photon-photon scattering at future lepton colliders can access Collins and unpolarized TMD fragmentation functions through two-hadron azimuthal asymmetries around the jet thrust axis, with enhanced up-quark flavor sensitivity.
Off-diagonal helicity density matrix elements for heavy vector mesons inclusively produced in N-N, gamma-N, l-N interactions
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abstract
Final state interactions in quark fragmentation may give origin to non zero values of the off-diagonal element rho_(1,-1) of the helicity density matrix of vector mesons V produced in current jets, with a large energy fraction x_E; the value of rho_(1,-1)(V) is related to the hard constituent dynamics and tests unusual properties of it. Some recent data on phi, K^* and D^* produced in e^+ e^- annihilations at LEP show such effects. Predictions are given here for rho_(1,-1) of heavy mesons produced in nucleon-nucleon, gamma-nucleon and lepton-nucleon interactions.
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First insight into transverse-momentum-dependent fragmentation physics at photon-photon colliders
Photon-photon scattering at future lepton colliders can access Collins and unpolarized TMD fragmentation functions through two-hadron azimuthal asymmetries around the jet thrust axis, with enhanced up-quark flavor sensitivity.