Statistical model for CMS EXO-24-011

This resource contains the full statistical model for the paper Search for new physics with dijet angular distributions in proton-proton collisions at sqrt(s) = 13 TeV in which it is descrbied the Measurement of dijet angular distributions in proton-proton collisions at sqrt(s) = 13 TeV corresponding to 138/fb and search for beyond the standard model physics.

The instructions below include the commands needed to reproduce the workspaces used for the results presented in the publication. For additional technical documentation please consult the CMS Combine documentation.

Analysis specific instructions

Developed using Combine v7 in CMSSW_8_1_0. Later Combine versions up to at least v10.5 should also be fine.

Each BSM model and mass/energy/coupling point has it's own datacard.

ADD: chi_datacard13TeV*_ADD[Lambda]_run2.txt

ALP: chi_datacard13TeV*_alp_QCD_fa[fa]_run2.txt

CI: chi_datacard13TeV*cs_nn31nnlo[Lambda]_[type]_run2.txt

DM mediator: chi_datacard13TeV*DMAxial_Dijet_LO_Mphi[mass]1_1p0_1p0_Mar5_gdmv_0_gdma_1p0_gv_0_ga[coupling]_run2.txt

QBH_ADD: chi_datacard13TeV*QBH_ADD6[Lambda]_run2.txt

QBH_RS1: chi_datacard13TeV*QBH_RS1[Lambda]_run2.txt

SMEFT: chi_datacard13TeV*_tripleG_QCD_CG[CG]_run2.txt

First signal process in the card is the QCD+BSM, second signal process is QCD, third process is a dummy background with 10e-20 events (because the combine scripts ask for it).

Using HiggsAnalysis.CombinedLimit.HiggsJPC:twoHypothesisHiggs (available in the Combine default repository) with parameter x describing the fraction of QCD+BSM and QCD, i.e. QCD+BSM corresponds to x=1 and QCD to x=0.

Physics Model

HiggsAnalysis.CombinedLimit.HiggsJPC:twoHypothesisHiggs

Example how to compute an exclusion limit

To obtain BSM energy/mass exclusion limits, for each mass point the limit on signal strength x is computed.

text2workspace.py -m 12000 chi_datacard13TeV3_ADD12000_run2.txt -P HiggsAnalysis.CombinedLimit.HiggsJPCmodified:twoHypothesisHiggs -o workspace.root
combine -m 12000 -M AsymptoticLimits -n ADD workspace.root

Models with signal strength x<1 are excluded at 95% confidence limit. The crossing point of the signal strenth x with 1 marks the BSM mass/energy/coupling limit.