## What is the Lagrangian of the Standard Model?

This version of the Standard Model is written in the Lagrangian form. The Lagrangian is a fancy way of writing an equation to determine the state of a changing system and explain the maximum possible energy the system can maintain.

**Is the Standard Model mathematically consistent?**

The Standard Model is renormalizable and mathematically self-consistent, however despite having huge and continued successes in providing experimental predictions it does leave some unexplained phenomena.

**What are the parameters of the Standard Model?**

Construction of the Standard Model Lagrangian

Parameters of the Standard Model | ||
---|---|---|

# | Symbol | Description |

1 | me | Electron mass |

2 | mμ | Muon mass |

3 | mτ | Tau mass |

### What does the Standard Model not explain?

The standard model does not explain gravity. The approach of simply adding a graviton to the Standard Model does not recreate what is observed experimentally without other modifications, as yet undiscovered, to the Standard Model.

**How many forces are in the Standard Model?**

four fundamental forces

The four fundamental forces are: gravity, electromagnetism, the weak force, and the strong force. Gravity is the one the model does not explain.

**Why is the Standard Model wrong?**

The Standard Model is famously broken but physicists don’t know how. The Model can’t explain gravity and dark matter. It also can’t explain why the Higgs boson is so heavy, why the universe has more matter than antimatter, why gravity is so weak or why the size of the proton is what it is.

#### How many particles are in a Standard Model?

The Standard Model consists of 17 fundamental particles. Only two of these – the electron and the photon – would have been familiar to anyone 100 years ago. They are split into two groups: the fermions and the bosons. The fermions are the building blocks of matter.

**How many fields are there in the Standard Model?**

By one way of counting there are 17 fields in the Standard Model: 6 for quarks (up, down, strange, charm, top, bottom) 3 for charged leptons (electron, muon, tau)