-- KrystsinaPetukhova - 2020-07-12

Validation of excited tau-lepton signal samples

This page describes basic steps made towards production of the Monte Carlo (MC) samples for excited tau-lepton signal. This analysis searches for excited tau-leptons in proton-proton collisions at a center-of-mass energy of 13 TeV.

Benchmark model

The excited lepton production by contact interaction described by four-fermion Lagrangian as introduced by U. Baur, M. Spira, and P. M. Zerwas (Phys.Rev. D42(1990) 815, Excited-quark and -lepton production at hadron colliders).

MC Generator

The MC generator of use is Pythia 8 with the version 8.243p and EvtGen (v.1.7.0) using the NNPDF23LO PDF set and the A14 underlying event tune. This Pythia 8 version includes correct mass suppression for excited fermion three-body decays F* -> F Fbar f, primarily for excited lepton decays with top-quarks in the final state (F = t).

Excited tau-lepton production

The single production of excited tau-leptons via four-fermion contact interaction (CI) is considered. CI.png

Strength of the SU(2), U(1) coupling, and SU(3) couplings are supposed to be unity (1.).

Excited tau-lepton decay

Generated excited tau-leptons decay via CI to a SM tau-lepton and a quark-antiquark pair. Feynman-diagram-for-the-production-of-an-excited-lepton-in-association-with-an-SM-lepton_W640.jpg

Exclusive mode "tau* -> tau + b + bbar" might be added to the analysis later on.

Mass range and scan points

For the compositeness scale Lambda = 5 TeV, excited tau-lepton mass was assumed to lay in the range [250, 5000] GeV with a step 250 GeV.

For the compositeness scale Lambda = 7 TeV, excited tau-lepton mass was assumed to be one of the following values {1000, 3000, 5000, 5500, 6000, 6500, 7000} GeV.

Additionally, samples at m_tau* = Lambda for {1000, 2000, 3000, 4000} GeV were produced.

Cross section, BR, effective luminosity

XS.pngBR.pngLumi.png

Athena commands

EVNT containers were produced with Athena branch 21.6 intended purposefully for event generation:

asetup AthGeneration, 21.6.12,here

An example if the command is given below:

Generate_tf.py --ecmEnergy=13000 --maxEvents=200000 --firstEvent=1 --randomSeed=0897557 --localPath=/afs/cern.ch/work/k/kpetukho/ExcTau/Generators/MC15JobOptions --jobConfig=421111/mc.Py8_A14_NNPDF23LO_excited_tau_CI_mtau_250_lam5000.py --runNumber=08973427 --outputEVNTFile=CI_tau_250_5000_200000evt.pool.root > log_CI_1000_5000_50000evt.generate

EVNT files were converted into xAOD for an analysis at truth level with Athena release 21.2:

asetup 21.2.86.0,AthDerivation

To check performance limitations, several samples are going to be checked at RECO level (ATLFastIISimulation and AOD derivation is being performed).

An example of the command is given below:

Reco_tf.py --inputEVNTFile evnt.pool.root --outputDAODFile test.pool.root --reductionConf TRUTH3

 

Spreadsheet

MC production spreadsheet can be found at Google Docs.

Plots with kinematic distributions

DSIS to be set after MC request approval.

DSID m_tau* [GeV] Lambda [TeV] N_events BR Cross section [pb] Luminosity [inv. fb] Job option Supporting plots
  250 5000 200,000 0.0193439 1.85E-02 1.081081E+04 JO example on gitlab Validation plots
  500 5000 200,000 0.066282 3.955E-02 5.05689E+03 JO example on gitlab Validation plots
  750 5000 200,000 0.1378238 5.271E-02 5.352685E+02 JO example on gitlab  
  1000 5000 50,000 0.217389 5.441E-02 9.189487E+02 JO example on gitlab Validation plots
  1250 5000 50,000 0.2930013 4.812E-02 5.305278E+02 JO example on gitlab  
  1500 5000 50,000 0.3594063 3.969E-02 6.452255E+02 JO example on gitlab  
  1750 5000 50,000 0.4153779 3.033E-02 1.648532E+03 JO example on gitlab  
  2000 5000 50,000 0.4616152 2.26E-02 1.739071E+03 JO example on gitlab Validation plots
  2250 5000 50,000 0.4995065 1.633E-02 1.575628E+03 JO example on gitlab  
  2500 5000 50,000 0.5305279 1.151E-02 2.164466E+03 JO example on gitlab  
  2750 5000 50,000 0.5560033 8.027E-03 3.431793E+03 JO example on gitlab  
  3000 5000 50,000 0.5770356 5.58E-03 6.079032E+03 JO example on gitlab  
  3250 5000 50,000 0.5945127 3.821E-03 1.12324E+04 JO example on gitlab  
  3500 5000 50,000 0.6091368 2.609E-03 1.277041E+04 JO example on gitlab  
  3750 5000 50,000 0.6214611 1.765E-03 1.925836E+04 JO example on gitlab  
  4000 5000 50,000 0.6319198 1.214E-03 4.119944E+04 JO example on gitlab Validation plots
  4250 5000 50,000 0.6408556 8.348E-04 6.008717E+04 JO example on gitlab  
  4500 5000 50,000 0.6485395 5.89E-04 8.62735E+04 JO example on gitlab Validation plots
  4750 5000 50,000 0.6551873 4.214E-04 1.242164E+05 JO example on gitlab  
  5000 5000 50,000 0.6609715 3.12E-04 1.76481E+05 JO example on gitlab  
  1000 7000 50,000 0.1305925 8.523E-03 5.866479E+03 JO example on gitlab Validation plots
  3000 7000 50,000 0.4854073 1.218E-03 4.10509E+04 JO example on gitlab  
  5000 7000 50,000 0.6131864 5.765E-05 8.7063E+05 JO example on gitlab  
  5500 7000 50,000 0.6293402 2.869E-05 1.83739E+06 JO example on gitlab  
  6000 7000 50,000 0.6422108 1.619E-05 3.436359E+06 JO example on gitlab  
  6500 7000 50,000 0.6526012 1.059E-05 6.129468E+06 JO example on gitlab  
  7000 7000 50,000 0.6610913 8.041E-06 1.148319E+07 JO example on gitlab  
  1000 1000 50,000 0.6482211 9.622E+01 5.196425E-01 JO example on gitlab  
  2000 2000 50,000 0.6581329 1.194E+00 4.187605E+01 JO example on gitlab  
  3000 3000 50,000 0.6601056 4.922E-02 1.015988E+03 JO example on gitlab  
  4000 4000 50,000 0.660733 3.343E-03 1.512976E+04 JO example on gitlab  

Analysis milestones

The kick-off meeting 06.07.2020 Weekly meeting of the Exotics: Lepton + X subgroup

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf BR.pdf r1 manage 15.0 K 2020-07-27 - 00:06 KrystsinaPetukhova BR vs m_tau*
PNGpng BR.png r1 manage 10.0 K 2020-07-27 - 00:12 KrystsinaPetukhova Branching ratio
PNGpng CI.png r1 manage 10.4 K 2020-07-26 - 15:46 KrystsinaPetukhova Prod_Sketch
JPEGjpg Feynman-diagram-for-the-production-of-an-excited-lepton-in-association-with-an-SM-lepton_W640.jpg r1 manage 14.0 K 2020-07-26 - 15:44 KrystsinaPetukhova Feynman_Prod_Decay
PDFpdf Lumi.pdf r1 manage 15.2 K 2020-07-27 - 00:06 KrystsinaPetukhova Effective luminosty estimated
PNGpng Lumi.png r1 manage 11.3 K 2020-07-27 - 00:12 KrystsinaPetukhova Effective luminosty
PDFpdf XS.pdf r1 manage 14.8 K 2020-07-27 - 00:05 KrystsinaPetukhova Cross section
PNGpng XS.png r1 manage 11.7 K 2020-07-27 - 00:11 KrystsinaPetukhova Cross section
PDFpdf val_m1000_lam5000.pdf r1 manage 308.2 K 2020-07-26 - 14:15 KrystsinaPetukhova Validation plots for ETL mass 1000 GeV and scale 5 TeV
PDFpdf val_m1000_lam7000.pdf r1 manage 268.2 K 2020-07-26 - 14:16 KrystsinaPetukhova Validation plots for ETL mass 1000 GeV and scale 7 TeV
PDFpdf val_m2000_lam5000.pdf r1 manage 309.5 K 2020-07-26 - 14:15 KrystsinaPetukhova Validation plots for ETL mass 2000 GeV and scale 5 TeV
PDFpdf val_m250_lam5000.pdf r1 manage 305.7 K 2020-07-26 - 14:14 KrystsinaPetukhova Validation plots for ETL mass 250 GeV and scale 5 TeV
PDFpdf val_m4000_lam5000.pdf r1 manage 310.2 K 2020-07-26 - 14:15 KrystsinaPetukhova Validation plots for ETL mass 4000 GeV and scale 5 TeV
PDFpdf val_m4500_lam5000.pdf r1 manage 312.1 K 2020-07-26 - 14:15 KrystsinaPetukhova Validation plots for ETL mass 4500 GeV and scale 5 TeV
PDFpdf val_m500_lam5000.pdf r1 manage 307.1 K 2020-07-26 - 14:14 KrystsinaPetukhova Validation plots for ETL mass 500 GeV and scale 5 TeV

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Topic revision: r6 - 2020-07-31 - KrystsinaPetukhova
 
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