DOI: 10.5281/zenodo.15133377
title: Fast-simulation datasets for boosted $bc$-tagging studies at the LHC

description: This public dataset accompanies the boosted $bc$-tagging study presented in the paper:



“Novel $|V_{cb}|$ extraction method via boosted $bc$-tagging with in-situ calibration”, arXiv:2503.00118.


The associated code can be found at this URL:



https://github.com/PKU-Hep-Group/boosted-wcb


Production Details

The dataset was generated using the following software tools:



MadGraph5_aMC@NLO v2.9.18 for LO matrix element calculation in pp collisions at $\sqrt{s}=13$ TeV

LHAPDF 6 with NNPDF3.1 NNLO PDF sets

PYTHIA 8.3 for parton showering

DELPHES 3.5 for fast simulation of detector response of object reconstruction, including:



FastJet package for jet clustering

JetClass-II Delphes cards (incorporating track smearing + pileup emulation + pileup mitigation via PUPPI)

Sophon and SophonAK4 models to perform realistic jet tagging of both small- and large-radius (R=0.4 and 0.8) jets (See details in SophonAK4’s Hugging Face repository)




Dataset Information

1. Boosted channel

Datasets in the trig1L_1fj directory are used for boosted-topology analyses. The derived n-tuples contain events passing the following selections:





Trigger: ≥1 isolated electron or muon(p_T > 24 GeV for electrons, >32 GeV for muons; with η and isolation cuts)




Preselection: ≥1 boosted jet (R = 0.8) present in the event




Analysis selection: ≥1 boosted jet (R = 0.8) not overlapping with the triggered lepton (ΔR(jet, lepton) > 0.8)(Events failing this are included as empty entries for uniformity.)



The generator-level configuration is optimized to target the boosted phase space without introducing phase-space bias.

Included samples:





TTbarSL_FJ_ntuple_part{1,2,3} — SM $t\bar{t}$ with semi-leptonic decays




TTbarSL_WToCB_FJ — SM $t\bar{t}$ with $W \to bc$ hadronic decays




WJetsToLNu_HT150* — SM W+jets with leptonic decays




TTbarSL_TToBHpmToBBC_MH*_FJ — BSM $t\bar{t} \to bH^\pm bW^\mp$, with $H^\pm \to bc$, fixed $m_{H^\pm}$ at 60, 70, ..., 160 GeV




TTbarSL_TToBHpmToBBC_VarMH_FJ — Same as above, with $m_{H^\pm}$ uniformly sampled within 50–170 GeV



2. Resolved channel

Datasets in the trig1L_4jets directory support resolved-topology analyses. n-tuples contain events passing:





Trigger: same single-lepton trigger as in the boosted channel




Preselection: ≥4 jets (R = 0.4) with p_T > 20 GeV




Analysis selection: ≥4 jets (R = 0.4) with p_T > 20 GeV and ΔR(jet, lepton) > 0.4(Non-passing events are included as empty entries.)



Similarly, the generator-level configuration is optimized to target the multijet phase space without introducing phase-space bias.

Included samples:





TTbarSL — SM $t\bar{t}$, semi-leptonic




TWSL — SM single-top $tW$, semi-leptonic




WWSL — SM diboson $WW$, semi-leptonic




*_WToCB — Variants with hadronic $W \to bc$ decays




WJetsToLNuPlus2J_Delphes4J — SM W+jets with leptonic W decay



3. Inclusive samples (for boosted channel)

Datasets in the trig1L directory contain events passing only the trigger requirement:





Trigger: same as above




Analysis selection: ≥1 boosted jet (R = 0.8) with ΔR(jet, lepton) > 0.8(Non-passing events are included as empty entries.)



Included samples:





TWSL




WWSL




TWSL_WToCB, WWSL_WToCB(Same definitions as above)



Usage

Detailed information is available in the GitHub repository: https://github.com/PKU-Hep-Group/boosted-wcb.