Genproductions

CMS의 Monte Carlo 샘플 생성을 위한 GridPack 생성 프레임워크입니다.

개요

Genproductions는 CMS에서 사용하는 Monte Carlo event generation의 표준 프레임워크입니다.

• GridPack creation: MadGraph, POWHEG 등 generator용 gridpack 생성
• Centralized workflow: 표준화된 샘플 생성 과정
• Version control: GitHub를 통한 체계적 관리

주요 구성 요소

Generator Support

• MadGraph5_aMC@NLO: Leading BSM signal generator
• POWHEG: NLO accuracy for SM processes
• PYTHIA8: Parton shower and hadronization
• Herwig: Alternative parton shower

GridPack Types

• LO GridPacks: Tree-level matrix elements
• NLO GridPacks: Next-to-leading order precision
• Matched samples: Matrix elements + parton shower
• Custom processes: User-defined physics models

사용 과정

1. Configuration Setup

# Process definition
process pp > w+ w- / h
# Parameter space
scan mWR [1000:5000:500]
# Cuts and settings
set ebeam1 6500
set ebeam2 6500

2. GridPack Generation

# Submit gridpack job
./submit_gridpack_generation.sh
  --name WR_M1000_2022
  --generator MadGraph
  --process pp_WR_ll

3. Validation

• Cross-section checks
• Kinematic distributions
• Generator-level comparisons
• LHE file inspection

CMS Integration

Official Sample Production

• PrepID system: 샘플 요청과 추적
• McM (Monte Carlo Management): 생산 관리
• DAS (Data Aggregation System): 데이터셋 검색

Local Testing

• CMSSW integration testing
• Fast simulation validation
• Full simulation cross-checks
• Analysis-ready format conversion

LRSM 예제

# LRSM heavy neutrino process
import model LRSM_UFO
generate p p > wr+ > l+ n4, wr+ > l+ n4
add process p p > wr- > l- n4~, wr- > l- n4~

이 도구를 사용하여 다양한 BSM 모델의 Monte Carlo 샘플을 체계적으로 생성할 수 있습니다.