Study of tau-pair production with the ZEUS detector at HERA

A search for events containing two high-transverse-momentum tau leptons 
has been performed with the ZEUS detector at HERA, using the data sample 
collected between 2004 and 2007, corresponding to 0.36 fb-1. At least one 
of the tau candidates is required to decay hadronically, while the second 
tau is required to decay either in and electron or in hadrons. The number 
of observed tau pairs has been compared with the prediction from the 
Standard Model, where the largest contribution is expected from 
Bethe-Heitler interactions. Possible deviations from the Standard Model, 
especially at high invariant masses of the tau pair, have been searched 
for.