Physics

Stringent limits on $C P T$ - and Lorentz-invariance violation from $B_{s}^{0}$ meson decays

R. Aaij, et al. (LHCb Collaboration)

Featured September 9, 2026

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Simply

By carefully watching how tiny $B_{s}^{0}$ particles decay, scientists at LHCb set the tightest limits yet on whether fundamental rules like CPT symmetry and Lorentz invariance might be broken, finding no signs of violation.

In depth

The LHCb collaboration has performed the most precise search for violations of CPT symmetry and Lorentz invariance in the

B_{s}^{0}

meson system. They achieved this by analyzing the time-dependent decay rates of

B_{s}^{0}

mesons to

D_{s}^{-} π^{+}

states, interpreting the results within the Standard Model Extension (SME) framework. The study sets stringent new limits on parameters that would indicate such fundamental symmetry violations, finding no evidence for their existence.

Key Takeaways

1
The study provides the most stringent constraints to date on CPT symmetry and Lorentz invariance violation in the $B_{s}^{0}$ meson system.
2
The analysis leverages the Standard Model Extension (SME) framework to parameterize potential violations, linking them to observable effects in $B_{s}^{0}$ meson decay-time distributions and their modulation with sidereal phase.
3
By analyzing $B_{s}^{0} \to D_{s}^{-} π^{+}$ decays, the collaboration measured the CPT-violating parameter $z$ and the Lorentz-violating parameter $Δ a_{μ}$ , finding values consistent with zero within experimental uncertainties.

Conceptual Flow

HIGH LEVEL

Methodology: How they searched for symmetry violations

Scientists looked for tiny wobbles in how particles decay, which would change depending on the Earth's position in space, using a big particle detector.

Particle Collisions

Particle Decays

Measure Decay Times & Directions

Look for Wobbles with Earth's Spin

Results: What they found about fundamental rules

They found no wobbles, meaning the fundamental rules of physics hold up extremely well, setting the strongest limits ever on these tiny changes.

Expected Wobbles (if rules broken)

Measured Wobbles (none found)

Compare & Set Limits

Fundamental Rules Hold Stronger Than Ever

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Stringent limits on CPT- and Lorentz-invariance violation from Bs0​ meson decays

Key Takeaways

Conceptual Flow

Stringent limits on $C P T$ - and Lorentz-invariance violation from $B_{s}^{0}$ meson decays