Heavy quark currents in Ultra-High Energy Neutrino Interactions
R. Fiore+, V. R. Zoller*
+Dipartimento di Fisica, Universitàdella Calabria
and Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Cosenza, I-87036 Rende, Cosenza, Italy
*Alikhanov Jnstitute for Theoretical and Experimental Physics, 117218 Moscow, Russia
We discuss heavy quark contributions to the neutrino-nucleon total cross
section at very high energies, well above the real
top production threshold.
The top-bottom weak current is found to generate strong
left-right asymmetry of neutrino-nucleon interactions.
We separate contributions of
different helicity states and make use of the
κ-factorization to derive simple and
practically useful formulas for the left-handed (FL) and
components of the conventional structure function
2xF3=FL-FR in terms of the integrated gluon density.
We show that and, consequently,
, where FT is the transverse structure function.
The conventional structure function F2=FS+FT at
appears to be dominated by its scalar
(also known as longitudinal) component FS
and the hierarchy arises naturally.
We evaluate the total neutrino-nucleon cross section
at ultra-high energies within the color