HERMES Measurements of Collins and Sivers Asymmetries from a transversely polarised Hydrogen Target
نویسنده
چکیده
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of πmesons and charged K-mesons in deep-inelastic scattering of positrons and electrons on a transversely polarised hydrogen target were observed. Significant SSA amplitudes for both the Collins and the Sivers mechanism are presented for the full data set recorded with transverse target polarisation at the HERMES experiment.
منابع مشابه
Single – spin Asymmetries in Semi – inclusive Pion Produc - tion
For the first time single–spin asymmetries in semi–inclusive pion production are measured by the Hermes experiment with a transversely polarised hydrogen target. Two different sine–modulations are extracted which can be related to the transversity δq(x) and Sivers f 1T (x) quark distribution functions. The extracted sine–moments still contain small sub–leading twist contributions which can be e...
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متن کاملAzimuthal single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarised hydrogen target
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of charged pions and kaons in deep-inelastic scattering of positrons on a transversely polarised hydrogen target were observed. SSA amplitudes for both the Collins and the Sivers mechanism are presented.
متن کاملTransverse Spin Physics at Hermes
HERMES has measured azimuthal single-spin asymmetries of charged pions produced in deep-inelastic scattering of positrons on a transversely polarised hydrogen target. The presented azimuthal moments provide access to two yet unknown quark distribution functions, the transversity distribution function δq and the Sivers function f ⊥ 1T .
متن کاملTransverse Spin Physics at Hermes
Single–spin asymmetries in semi–inclusive pion production are measured by the HERMES experiment for the first time, with a transversely polarised hydrogen target. Two different sine–dependencies are extracted which can be related to the quark distributions transversity h1(x) and the Sivers function f ⊥ 1T (x).
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تاریخ انتشار 2008