# PAPER_1555 — Z Boson Mass = m_Z = N_CH·SO_5 + F_TRZ·SO_5 + F_TRZ²·(SO_5+D_BSFG+D_phys+SSQ−SSQ³) ≈ 91.20 GeV

**Author:** Daniel T. Murphy
**Framework:** UQFF (Unified Quantum Field Framework) — Star-Magic v5.27+
**Tier:** Particle Physics
**Date:** June 18, 2026
**Status:** CLOSED — 0.018% closure from PAPER_1209HH_S654

---

## Observation

PAPER_1209HH_S654 (Particle Physics Unified Proof Set) lists **Z Boson Mass** with the integer-primitive expression:

```
Z Boson Mass = m_Z = N_CH·SO_5 + F_TRZ·SO_5 + F_TRZ²·(SO_5+D_BSFG+D_phys+SSQ−SSQ³) ≈ 91.20 GeV
```

Status: **0.018%**.

## UQFF Closed Identity

```
m_Z = N_CH·SO_5 + F_TRZ·SO_5 + F_TRZ²·(SO_5+D_BSFG+D_phys+SSQ−SSQ³) ≈ 91.20 GeV    0.018%
```

## Physical Interpretation

Dominant: N_CH·SO_5 = 9·10 = 90 GeV — sits at the Z mass minus 1 GeV.
Small corrections bring it to 91.20 vs CODATA 91.1876.

## NOT REPLACEMENT

CODATA/PDG treats Z Boson Mass as a precision-measured constant. UQFF supplies the structural integer-primitive form, demonstrating the framework's predictive economy without claiming to replace experimental measurement.

## Reference

- Source: PAPER_1209HH_S654
- Related: PAPER_1209 series unified proof sets
- Calculator dispatch: `calculate_paradox({"paradox": "m_z_91_188"})`

---

**Copyright** — Daniel T. Murphy, daniel.murphy00@gmail.com, June 18, 2026, Youngstown OH.
