Phases of augmented hadronic light-front wave functions

详细信息    查看全文

• 作者：Stanley J. Brodsky ; Barbara Pasquini ; Bo-Wen Xiao ; Feng Yuan
• 关键词：QCD ; Lift-front wave function ; Single spin asymmetry
• 刊名：Physics Letters B
• 出版年：2010
• 出版时间：19 April 2010
• 年：2010
• 卷：687
• 期：4-5
• 页码：327-330
• 全文大小：161 K

文摘

It is an important question whether the final/initial state gluonic interactions which lead to naive-time-reversal-odd single-spin asymmetries and diffraction at leading twist can be associated in a definite way with the light-front wave function hadronic eigensolutions of QCD. We use light-front time-ordered perturbation theory at the lowest nontrivial order to obtain augmented light-front wave functions which contain an imaginary phase which depends on the choice of advanced or retarded boundary condition for the gauge potential in light-cone gauge. We apply this formalism to the wave functions of the valence Fock states of nucleons and pions, and show how this illuminates the factorization properties of naive-time-reversal-odd transverse momentum dependent observables which arise from rescattering. In particular, one calculates the identical leading-twist Sivers function from the overlap of augmented light-front wave functions that one obtains from explicit calculations of the single-spin asymmetry in semi-inclusive deep inelastic lepton–polarized nucleon scattering where the required phases come from the final-state rescattering of the struck quark with the nucleon spectators.