New Fitting Concept in ATLAS muon tracking for the LHC Run-2

¹ Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
² IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
³ Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam, Netherlands
⁴ Department of Physics, Technion, Israel Institute of Technology Haifa, Israel
⁵ Department of Physics, University of Massachussetts Amherst, MA, USA
⁶ CERN Geneva, Switzerland

^* e-mail: william.leight@desy.de
^** e-mail: pierre-francois.giraud@cern.ch
^*** e-mail: s01@nikhef.nl
^**** e-mail: jochen.meyer@cern.ch
^† e-mail: edward.moyse@cern.ch
^‡ e-mail: alan.poppleton@cern.ch

Published online: 17 September 2019

Abstract

Muons with high momentum - above 500 GeV - are an important constituent of new physics signatures in many models. Run-2 of the LHC is greatly increasing ATLAS’s sensitivity to such signatures thanks to an ever-larger dataset of such particles, enhanced further by an increase in the center-of-mass energy. The ATLAS Muon Spectrometer chamber alignment contributes significantly to the uncertainty of the reconstruction of these high-momentum objects. The proper treatment of measurements during tracking and the correct propagation of the alignment effects is extremely challenging. Recently, an innovative approach that imposes Gaussian constraints on ensembles of detector hits was implemented. It provides a significant improvement to high-momentum tracking without increasing the CPU budget. Furthermore, it allows for the verification of the expected alignment quality using high-statistics collision data. A detailed discussion of the algorithmic realization is given, the expected performance gains are presented and prospects for further applications of the approach are outlined.