Monte Carlo Samples and Codes for BSM in t tbar

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ttbar production without decay

These files are no longer relevant... See the Software.TopBSM model for the implementation of all these 'models'

Model files and plots used for ttbar paper by Rikkert Frederix and Fabio Maltoni ​arXiv:0712.2355 (Contact: Rikkert Frederix, rikkert.frederix -at- uclouvain.be)

pp>tt~ (QCD only)

These are files for the Standard Model ttbar production, for QCD production only.

• madevent.tar.gz​: model files qcd ttbar production

pp>zprime>tt~ signal production (no interference with SM Z>ttbar)

• madevent_zprime.tar.gz​: model files pp>zprime>ttbar production

pp>zprime/Z/A>tt~ signal +QED background production (with interference)

• madevent_QEDzprime.tar.gz​: model files pp>zprime/Z/A>ttbar production

QCD pp>tt~ + pp>h>tt~, including interference effects

• madevent_h_.tar.gz​: model files for pp>h>tt~ + pp>tt~ (QCD)

pp>spin-2>tt~ signal production (summed tower of KK states)

• madevent_s2.tar.gz​: model files pp>spin-2>ttbar production (no decay)

Some selected plots (parton-level)

• (pseudo-)scalar contribution invariant mass spectrum ttbar: ttbar_spin-0.png​ It is assumed that the (Pseudo-)scalar decays only to top quarks in the calculation of its width.
• zprime_run_3_plots.ps​: zprime contribution invariant mass spectrum ttbar
• spin_2.ps​: Graviton KK tower contribution invariant mass spectrum ttbar

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ttbar production with semi-leptonic decay

Model files used for ttbar paper by Johan Alwall, Rikkert Frederix and Fabio Maltoni in preparation (Contact: Rikkert Frederix, rikkert.frederix -at- uclouvain.be)

gg>tt~ + gg>h>tt~ Interference effects, semi-leptonic decay

• madevent_h.tar.gz​: model files gg>ttbar + gg>h>ttbar production

resonance pp>zprime>tt~ semi-leptonic decay

• madevent_zprime_semi.tar.gz​: model files pp>zprime>ttbar production semi-leptonic decay including QCD and QED ttbar production (+ interference).

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ttbar production with double leptonic decay

Model files and plots used for ttbar paper by Johan Alwall, Rikkert Frederix and Fabio Maltoni in preparation (Contact: Rikkert Frederix, rikkert.frederix -at- uclouvain.be)

QCD pp>tt~ double leptonic decay

• madevent_QCD_decay.tar.gz​: model files qcd ttbar production

resonance pp>zprime>tt~ double leptonic decay

• madevent_zprime_decay.tar.gz​: model files pp>zprime>ttbar production double leptonic decay

resonance pp>spin-2>tt~ double leptonic decay

• madevent_spin-2.tar.gz​: model files pp>spin-2>ttbar production

Some selected plots (parton-level): Double distributions for spin information of ttbar for various ttbar production mechanism. (theta+(-) is the angle between the top (anti-top) in the ttbar cms frame and the positive (negative) lepton in the top (anti-top) cms frame.)

• spin_corr_sm.ps​: QCD ttbar production
• double_distr.ps​: Resonances.

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non-resonance BSM effects in ttbar invariant mass

Model files and plots used for ttbar paper by Johan Alwall, Rikkert Frederix and Fabio Maltoni in preparation (Contact: Rikkert Frederix, rikkert.frederix -at- uclouvain.be)

pp>tt~phi

• madevent_smh.tar.gz​: model files pp>tt~phi production, where phi is a scalar

pp>t1t1~>tt~n1n1

• madevent_mssm.tar.gz​: model files stopstopbar > ttbar n1n1 production

Some selected plots (parton-level)

• mssm_sps1a.ps​: normalized invariant mass tt~ in tt~n1n1 final state
• invisible_H_combined.ps​: normalized invariant mass tt~ in tt~phi final state

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Other files:

QCD ttbar production

These are events for the Standard Model ttbar production, for QCD production only. ​banner

• Parton level (approx. 100k events) ​LHE events ​Rootfile. Plot​ ttbar invariant mass.
• Showered & hadronized events (approx 50k events per set)
  • Set 1 ​STDHEP ​Rootfile
  • Set 2 ​STDHEP ​Rootfile
• Reconstructed Objects (PGS) (approx 50k events per set)
  • Set 1 ​LHCO ​Rootfile
  • Set 2 ​LHCO ​Rootfile

QED ttbar production

These are events for the Standard Model ttbar production, for QED production only. ​banner

• Parton level (approx. 100k events) ​LHE events ​Rootfile. Plot​ ttbar invariant mass.
• Showered & hadronized events (approx 50k events per set)
  • Set 1 ​STDHEP ​Rootfile
  • Set 2 ​STDHEP ​Rootfile
• Reconstructed Objects (PGS) (approx 50k events per set)
  • Set 1 ​LHCO ​Rootfile
  • Set 2 ​LHCO ​Rootfile

Zprime

These are events for pp -> Z/gamma/Zprime -> ttbar ​banner. The Zprime, of mass 1.5 TeV, couples to quarks with the same strength as the SM Z boson. It does not couple to leptons (only relevant for the decay width). Note that there is interference between the Z and the Zprime.

• Parton level (approx. 100k events) ​LHE events ​Rootfile. Plot​ ttbar invariant mass.
• Showered & hadronized events (approx 50k events per set)
  • Set 1 ​STDHEP ​Rootfile
  • Set 2 ​STDHEP ​Rootfile
• Reconstructed Objects (PGS) (approx 50k events per set)
  • Set 1 ​LHCO ​Rootfile
  • Set 2 ​LHCO ​Rootfile

Pseudo-scalar

These are events for the ttbar production, including a s-channel pseudo-scalar exchange ​banner. The pseudo-scalar, of mass 450 GeV, couples with strength gamma_5*m_f/v to fermions. (m_f is the fermion mass and v is the Higgs field vev). The (top quark) loop induced gluon fusion process is production process for the pseudo-scalar. Note that there is interference between the QCD ttbar background and the pseudo-scalar ttbar production.

• Parton level (approx. 100k events) ​LHE events ​Rootfile. Plot​ ttbar invariant mass.
• Showered & hadronized events (approx 50k events per set)
  • Set 1 ​STDHEP ​Rootfile
  • Set 2 ​STDHEP ​Rootfile
• Reconstructed Objects (PGS) (approx 50k events per set)
  • Set 1 ​LHCO ​Rootfile
  • Set 2 ​LHCO ​Rootfile