Background modeling for the GERDA experiment.

The neutrinoless double beta (0νββ) decay experiment GERDA at the LNGS of INFN has started physics data taking in November 2011. This paper presents an analysis aimed at understanding and modeling the observed background energy spectrum, which plays an essential role in searches for a rare signal like 0νββ decay. A very promising preliminary model has been obtained, with the systematic uncertainties still under study. Important information can be deduced from the model such as the expected background and its decomposition in the signal region. According to the model the main background contributions around Qββ come from ²¹⁴Bi, ²²⁸Th, ⁴²K, ⁶⁰Co and α emitting isotopes in the ²²⁶Ra decay chain, with a fraction depending on the assumed source positions. [ABSTRACT FROM AUTHOR]