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Welcome to the RAD Cookbook

RAD (Reaction Analysis & Design) is a high-performance, vectorized analysis framework for ROOT. This Wiki serves as a recipe collection to help you solve common physics analysis problems using the declarative RAD style.

🚀 Getting Started

• Installation Guide - Setting up ROOT_INCLUDE_PATH.
• Quick Start Tutorial - Running the Y(4260) example macro.

📖 Overview

• Combitorials - Combitorial algorithm

📖 The Recipe Book

Defining Particles

• Recipe: Simple Cuts - Using string expressions (e.g., "rec_p > 1.0").
• Recipe: Custom PID Logic - Using C++ lambdas for advanced PID.
• Recipe: Handling Beams - How to set beam vectors from Rec or MC.

Reconstructing Topology

• Recipe: 2 Body Decays - Reconstructing $J/\psi \to e^+e^-$.
• Recipe: Cascade Decays - Multi-step decays like $B \to D \to K \pi$.
• Recipe: Missing Mass - Reconstructing neutrons or neutrinos via missing momentum.

Analysis & Backgrounds

• Recipe: Truth Matching - How to automatically link Rec tracks to MC Truth.
• Recipe: Sideband Subtraction - Using Masks to handle background regions.
• Recipe: Event Mixing - (Planned) techniques for combinatorial background estimation.

⚙️ Advanced

• Architecture: Vectorization - Why we don't use TLorentzVector and how RVec works.
• Parallel I/O - Understanding SnapshotCombi and threading.