Parts | Days | Selection | Search | Downloads | Help
T: Teilchenphysik
T 203: Protonstruktur 2
T 203.4: Talk
Monday, March 15, 1999, 17:25–17:40, TE10
Strange Quark Contributions to Nucleon Structure Functions: 1/NC and Symmetry Breaking Corrections — •O. Schröder, H. Reinhardt, and H. Weigel — Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen
Nucleon structure functions can be efficiently computed [1] in the NJL chiral soliton model [2] of the nucleon. Employing the collective coordinate approach to the three flavor version [3],[4] of this model the contributions of strange degrees of freedom to both the unpolarized and polarized structure functions of the nucleon are computed. This yields these structure functions at the low energy scale characteristic for the model. Subsequently they are evolved to the experimentally relevant scale using the DGLAP treatment. We are especially interested in the polarized structure functions since they are in close connection with the “proton spin puzzle”[5]. Symmetry breaking and 1/NC corrections arise from both, the explicit cranking pieces associated with the collective rotation as well as the bilocality of the hadronic tensor even when the Weyl ordering for the collective operators is adopted.
[1] H. Weigel, L. Gamberg, H. Reinhardt, Phys. Lett. B399 (1997) 287; Phys. Rev. D55 (1997) 6910.
[2] R. Alkofer, H. Reinhardt, H. Weigel, Phys. Rep. 265 (1996) 139.
[3] H. Yabu, H. Ando, Nucl. Phys. B301 (1988) 601.
[4] H. Weigel, Intl. J. Mod. Phys. A11 (1996) 2419.
[5] O.Schröder, H. Reinhardt, H.Weigel, Phys. Lett. B439 (1998) 398