TY - RPRT TI - Spin-dependent quark beam function at NNLO AU - Boughezal, Radja AU - Petriello, Frank AU - Schubert, Ulrich AU - Xing, Hongxi PY - 2017 DO - 10.1103/physrevd.96.034001 UR - https://www.osti.gov/biblio/1373951 ID - 1373951 ER -