Phenomenological constraints on A(N) in p(up arrow)p -> pi X from Lorentz invariance relations

作者：Gamberg Leonard; Kang Zhong Bo; Pitonyak Daniel^*; Prokudin Alexei

来源：Physics Letters B, 2017, 770: 242-251.

DOI：10.1016/j.physletb.2017.04.061

• Transverse spin
• Perturbative QCD
• Collinear factorization
• JLAB-THY-17-2405

We present a new analysis of A(N) in p(up arrow)p -> pi X within the collinear twist-3 factorization formalism. We incorporate recently derived Lorentz invariance relations into our calculation and focus on input from the kinematical twist-3 functions, which are weighted integrals of transverse momentum dependent (TMD) functions. In particular, we use the latest extractions of the Sivers and Collins functions with TMD evolution to compute certain terms in A(N). Consequently, we are able to constrain the remaining contributions from the lesser known dynamical twist-3 correlators.

• 出版日期2017-7-10
• 单位Los Alamos