Higher–Twist Contribution to Pion Structure Function: 4–Fermi Operators
نویسندگان
چکیده
S. Capitani , M. Göckeler , R. Horsley , B. Klaus , V. Linke , P.E.L. Rakow , A. Schäfer b and G. Schierholz a,d aDeutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany bInstitut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany cInstitut für Physik, Humboldt-Universität zu Berlin, D-10115 Berlin, Germany dDeutsches Elektronen-Synchrotron DESY, John von Neumann-Institut für Computing NIC, D-15738 Zeuthen, Germany eInstitut für Theoretische Physik, Freie Universität Berlin, D-14195 Berlin, Germany
منابع مشابه
Meson twist - 4 parton distributions in terms of twist - 2 distribution amplitudes at large N c
In this particular isospin combination of structure functions the contribution of twist-2 operators cancels out exactly and twist-4 contributions are dominant. It is remarkable that in the large Nc limit the twist-4 distribution function of quarks in the pion can be reduced to a convolution of twist-2 pion distribution amplitudes. 2. One can read the contribution of four-quark twist-4 operators...
متن کاملRenormalon Model of Twist-4 Corrections to the Pion Distribution Amplitude
In this paper we describe a renormalon-inspired model of twist–4 power corrections to the light-cone pion distribution amplitude, and compare it to the results obtained using the conformal wave expansion. We find that the overall functional form predicted in this renormalon model is similar to the one predicted in the standard approach to higher twist contributions involving an expansion in con...
متن کاملA Model for the Twist-3 Wave Function of the Pion and Its Contribution to the Pion Form Factor
Tao Huang1,2∗ and Xing-Gang Wu2† CCAST(World Laboratory), P.O.Box 8730, Beijing 100080, P.R.China, Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918(4), Beijing 100049, China.‡ Abstract A model for the twist-3 wave function ψp(x,k⊥) of the pion has been constructed based on the moment calculation by applying the QCD sum rules, whose distribution amplitude has a better e...
متن کامل/ 96 05 46 6 v 1 3 J un 1 99 6 QCD Analysis of Twist - 4 Contributions to the g 1 Structure Functions
We analyze the twist-4 contributions to Bjorken and Ellis-Jaffe sum rules for spin-dependent structure function g1(x,Q ). We investigate the anomalous dimensions of the twist-4 operators which determine the logarithmic correction to the 1/Q behavior of the twist-4 contribution by evaluating off-shell Green’s functions in both flavor non-singlet and singlet case. It is shown that the EOM operato...
متن کاملQCD Analysis of Twist-4 Contributions to the g1 Structure Functions
We analyze the twist-4 contributions to Bjorken and Ellis-Jaffe sum rules for spin-dependent structure function g1(x,Q ). We investigate the anomalous dimensions of the twist-4 operators which determine the logarithmic correction to the 1/Q behavior of the twist-4 contribution by evaluating off-shell Green’s functions in both flavor non-singlet and singlet case. It is shown that the EOM operato...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1999