Abstract
We present an algorithm for the reconstruction of the Higgs mass in events with Higgs bosons decaying into a pair of τ leptons. The algorithm is based on matrix element (ME) techniques and achieves a relative resolution on the Higgs boson mass of typically 15–20%. A previous version of the algorithm has been used in analyses of Higgs boson production performed by the CMS collaboration during LHC Run 1. The algorithm is described in detail and its performance on simulated events is assessed. The development of techniques to handle τ decays in the ME formalism represents an important result of this paper.
Highlights
A new boson of mass 125 GeV has been observed by the ATLAS and CMS collaborations [1,2]
Considering that the resolution on mττ, quantified by σl/M and σh/M, achieved by the SVfitMEM and cSVfit algorithms is almost identical, we find that the cSVfit algorithm represents the best compromise between physics performance and computing time requirements in practical applications of the SVfit algorithm
An example for such an application is the analysis of Standard Model (SM) H boson production in association with a pair of top quarks in final states with a τ lepton [80], in which the existence of neutrinos from W → lν decays preclude the reconstruction of the H boson mass by the SVfit algorithm
Summary
A new boson of mass 125 GeV has been observed by the ATLAS and CMS collaborations [1,2]. The properties of the new particle are compatible with the predictions for the Standard Model (SM) Higgs ( H) boson [3,4,5,6,7,8] within the present experimental uncertainties [9,10,11,12]. Decays of heavy resonances into τ lepton pairs provide high sensitivity to search for models with an extended Higgs sector, constituting an important experimental signature at the LHC. The signal is expected to show up as a small bump on the high mass tail of the mττ distribution of the background The signal is expected to show up as a small bump on the high mass tail of the mττ distribution of the background (see e.g. Figs. 8, 9, and 11 of Ref. [13])
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