Novel effects in deep inelastic scattering from spin-one hadrons

Angular momentum sum rule for spin-one hadronic systems

“…A similar effect also can be shown for H 5 (x, 0, 0) ≡ b 1 , in agreement with the model calculations of [23].…”

“…As in the forward case [23], we find that the distinct angular dependence of the D-wave component plays a non trivial role (more details will be given in [13]) producing a most striking effect through the GPD E. Its impact is however suppressed. A similar effect also can be shown for H 5 (x, 0, 0) ≡ b 1 , in agreement with the model calculations of [23].…”

Relativistic calculation of structure functions b1,2(x) of the deuteron

“…The spin-dependent SFs b 1,2 (x) 2 of spin-1 hadrons have been studied on a few occasions, including the vector mesons and deuteron [3,4,5,6]. For mesons some qualitative estimates have been done, but "a real understanding of b 1 (x) at the quark level is not yet available" [5].…”

The spin-dependent structure function g1(x) of the deuteron from polarized deep-inelastic muon scattering

“…We neglect the contribution from quadrupole structure functions which is expected to be small in the kinematic range of our data [12,13] [13,16]. Here, T = 1 3 ( T 0 + T 1 + T 2 ) is the total transverse photoabsorption cross-section, T J is the cross section for absorption of a virtual photon by a deuteron with total spin projection J in the photon direction, and TL J results from the spin-ip amplitude in forward photon-deuteron Compton scattering.…”

“…The axial charge a 0 and the corresponding charges of the individual quark avours can be understood as quark contributions to the proton spin, up to a gluonic contribution which is due to the U(1) anomaly of the singlet axial vector current [38]. In the Adler{ Bardeen scheme, the axial charges are decomposed into quark and gluon contributions q and g as a q = q s 2 g ( q = u; d; s): (13) The axial charge a q depends on Q 2 , whereas q is Q 2 -independent in the AB scheme. This suggests to interpret q as the intrinsic quark-spin content of the nucleon.…”