DOI 10.1007/s100529900965
A low-energy compatible SU(4)-type model
for vector leptoquarks of mass 
1TeV
A. Blumhofer1 - B. Lampe2
1 Department of Physics, University of Munich,
Theresienstrasse 37, D-80333 Munich, Germany
2 Max Planck Institute for Physics,
Föhringer Ring 6, D-80805 Munich, Germany
Received: 8 March 1998 / Published online: 25 January 1999
Abstract
The Standard Model is extended by a SU(2)L singlet
of vector leptoquarks. An additional SU(4) gauge symmetry between
right-handed up quarks and right-handed leptons is introduced
to render the model
renormalizable. The arrangement is made in such a way that
no conflict with low energy restrictions is encountered.
The SU(2)L singlet mediates interactions between the
right-handed leptons and up type quarks for which only moderate
low energy restrictions MLQ/gLQ > few hundred GeV exist.
However, it is not a candidate
to explain the anomalous HERA data at large Q2
because theoretical reasons imply that 
which
would give a much stronger anomalous HERA effect.
We furthermore argue that the inequality is a general
feature of consistent vector leptoquark models.
Although our model is not relevant for HERA, it is
interesting per se as a description of leptoquarks of mass 1TeV
consistent with all low-energy requirements.
Copyright Springer-Verlag
