# Introduction

Please note: The tool is not ready for use and is not a current recommendation of TauWG!

The Tau Fake Factor Tool is an effort to harmonize estimation of jets reconstructed as tau objects, born from the Fake Tau Task Force (FTTF). The tool calculates fake factors (FF) for jets that are misidentified as taus. This is achieved by identifying the fraction of fake tau jets initiated by quarks and interpolating FF between known FFs associated with Z+jets and multijet processes for bins of pT and number of prongs. Therefore, the tool provides FFs for Z+jets and multijet regions as well as MC templates for quark and gluon initated jets in order to conduct the fit for the quark fraction. The discriminating variable used for quark/gluon separation is the LCTopo jet width.

An alternate method of the tool is available for use, which finds the fraction of multijet-like events in a given sample. This is achieved by using Z+jets and multijet jet width distributions as templates for the fit. The fraction of multijet-like events is then used to find the weighted combination of Z+jets and multijet FF to estimate the FF in the region of interest.

# Usage

The Tau Fake Factor Tool (TFFT) exists as a single executable in the Athena 21.2 framework. The nominal tool requires a specific directory structure to specify the region where FF is calculated. In order to accommodate full functionality, each directory (each region), should include pT and jet width distributions binned in supported pT bins. The tool will parse the directory structure and perform interpolation “on-the-fly”. The workflow of TFFT is shown in attachment below ("workflow").

Note, the FTTF has not provided recommendations for systematics at this time. The tool, subsequently, does not provide systematics.

TFFT’s single executable (named fakeTauTool) requires one argument with an option flag:

# Test Input

A sample file which can be used for testing the functionality of the tool is available. The sample file is a bin-by-bin 40/60 mixture of multijet/Z+jet interpolation regions with pT bins up to 150 GeV.

The file is located at /eos/user/j/jmuse/fakeToolInputs

# Contact

-- JosephMMuse - 2019-10-18

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png data_workflow.png r1 manage 91.3 K 2019-11-05 - 13:07 JosephMMuse
png workflow.png r1 manage 183.3 K 2019-11-05 - 13:07 JosephMMuse
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Topic revision: r4 - 2019-11-06 - JosephMMuse

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