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The NEXT experiment aims to observe the neutrinoless double beta decay ofxenon in a high-pressure Xe136 gas TPC using electroluminescence (EL) toamplify the signal from ionization. One of the main advantages of thistechnology is the possibility to reconstruct the topology of events withenergies close to Qbb. This paper presents the first demonstration that thetopology provides extra handles to reject background events using data obtainedwith the NEXT-DEMO prototype.  Single electrons resulting from the interactions of Na22 1275 keV gammas andelectron-positron pairs produced by conversions of gammas from the Th228 decaychain were used to represent the background and the signal in a double betadecay. These data were used to develop algorithms for the reconstruction oftracks and the identification of the energy deposited at the end-points,providing an extra background rejection factor of 24.3 +- 1.4 (stat.)%, whilemaintaining an efficiency of 66.7 +- 1% for signal events.

First proof of topological signature in the high pressure xenon gas TPC with electroluminescence amplification for the NEXT experiment