2021 Impact factor 4.991
Particles and Fields
Eur. Phys. J. C 7, 141-148
DOI 10.1007/s100529900965

A low-energy compatible SU(4)-type model
for vector leptoquarks of mass $\leq$ 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

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 $g_{LQ} \geq g_s$ which would give a much stronger anomalous HERA effect. We furthermore argue that the inequality $g_{LQ} \geq g_s$ 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 $\leq$ 1TeV consistent with all low-energy requirements.

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