Ruhe Tim
Contact
 Position:
 TU Dortmund University
 Address
 Germany
Miscellaneous Information
 Miscellaneous Information

Abstract Reference: 30517
Identifier: P1.26
Presentation: Poster presentation
Key Theme: 1 Reduction and Analysis Algorithms for Large Databases and ViceversaMining for Spectra  The Dortmund Spectrum Estimation Algorithm
Authors:
Ruhe Tim, Voigt Tobias , Wornowizki MaxObtaining energy spectra of incident particles such as neutrinos or gammarays is a common challenge in neutrino and AirCherenkov astronomy, as the particle's energy cannot be observed directly but has to be inferred from other observables e.g. energy losses of secondary particles utilized for detection. The task is further made difficult by the fact that the production of secondaries, e.g. in a neutrinonucleon interaction is governed by stochastical processes. Mathematically this corresponds to an inverse problem, which is described by the Fredholm integral equation of the first kind. Several algorithms for solving inverse problems exist, which are, however, somewhat limited, for example in the number of input variables or in the sense that only the unfolded distribution is returned and information on individual events is lost.
We present the Dortmund Spectrum Estimation Algorithm (DSEA), which aims at overcoming the afore mentioned obstacles by treating the inverse problem as a multinominal classification task. Within DSEA the final spectrum is obtained by summing the classconfidences of the individual events. DSEA, therefore, offers the advantage that any learning algorithm can be used as long as it returns the confidences of the individual classes. This results in a modular and highly flexible algorithm that can easily be tailored to a problem at hand. To avoid a potential bias on the class distribution used for the training of the learner, DSEA can be used iteratively using a uniform classdistribution as input.