Reconstruction of τ lepton pair invariant mass using an artificial neural network

Abstract The reconstruction of the invariant mass of τ lepton pairs is important for analyses containing Higgs and Z bosons decaying to τ + τ − , but highly challenging due to the neutrinos from the τ lepton decays, which cannot be measured in the detector. In this paper, we demonstrate how artificial neural networks can be used to reconstruct the mass of a di- τ system and compare this procedure to an algorithm used by the CMS Collaboration for this purpose. We find that the neural network output shows a smaller bias and better resolution of the di- τ mass reconstruction and an improved discrimination between a Higgs boson signal and the Drell–Yan background with a much shorter computation time.

[1]  Gorjan Alagic,et al.  #p , 2019, Quantum information & computation.

[2]  V. M. Ghete,et al.  Observation of the Higgs boson decay to a pair of τ leptons with the CMS detector , 2018 .

[3]  A. Djouadi,et al.  Higgs production at the lHC , 2010, 1012.0530.

[4]  Jimmy Ba,et al.  Adam: A Method for Stochastic Optimization , 2014, ICLR.

[5]  Tsuyoshi Murata,et al.  {m , 1934, ACML.

[6]  S. Mrenna,et al.  Pythia 6.3 physics and manual , 2003, hep-ph/0308153.

[7]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.

[8]  Peter Skands,et al.  An introduction to PYTHIA 8.2 , 2014, Comput. Phys. Commun..

[9]  Ryszard S. Romaniuk,et al.  Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC , 2012 .

[10]  J. Favereau,et al.  DELPHES 3: a modular framework for fast simulation of a generic collider experiment , 2013, Journal of High Energy Physics.

[11]  A. Elagin,et al.  A new mass reconstruction technique for resonances decaying to ττ , 2011 .

[12]  W. Marsden.  I and J , 2012 .

[13]  Martín Abadi,et al.  TensorFlow: Large-Scale Machine Learning on Heterogeneous Distributed Systems , 2016, ArXiv.

[14]  João Paulo Teixeira,et al.  The CMS experiment at the CERN LHC , 2008 .

[15]  Hoang Dai Nghia Nguyen,et al.  Cross-section measurements of the Higgs boson decaying into a pair of τ -leptons in proton-proton collisions at ffiffi s p = 13 TeV with the ATLAS detector , 2019 .

[16]  R. Frederix,et al.  The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations , 2014, 1405.0301.

[17]  I. Hinchliffe,et al.  Higgs decay to τ+τ−A possible signature of intermediate mass Higgs bosons at high energy hadron colliders , 1988 .

[18]  The Cms Collaboration.  Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC , 2012, 1207.7235.

[19]  B. Calpas,et al.  Reconstruction of the Higgs mass in events with Higgs bosons decaying into a pair of τ leptons using matrix element techniques , 2016, 1603.05910.

[20]  Christian Veelken,et al.  Reconstruction of the Higgs mass in H → ττ Events by Dynamical Likelihood techniques , 2014 .

[21]  M. Kelsey,et al.  Study of the B0 → ρ(770)°K*(892)0 decay with an amplitude analysis of B0 → (π+π−)(K+π−) decays , 2018, Journal of High Energy Physics.