General search for new phenomena in e p scattering at HERA

A model-independent search for deviations from the Standard Model prediction is performed in e+p and e−p collisions at HERA using H1 data corresponding to an integrated luminosity of 117 pb −1. For the first time all event topologies involving isolated electrons, photons, muons, neutrinos and jets with high transverse momenta are investigated in a single analysis. Events are divided into exclusive event classes according to their final state. A novel statistical algorithm is used to search for deviations from the Standard Model in the distributions of the scalar sum of transverse momenta and invariant mass of final state particles and to quantify their significance. A good agreement with the Standard Model prediction is observed in most of the event classes and one interesting event is measured with four jets and an electron. The most significant deviation is found in a topology containing an isolated muon, missing transverse momentum and a jet, where a deviation has been previously reported.