Question
The ADMX and BREAD experiments aim to detect this particle by using a strong magnetic field to convert it to photons. For 10 points each:
[10h] Name this hypothetical light dark-matter particle, whose existence was proposed as a consequence of the Peccei–Quinn (“pet-CHAY kwin”) mechanism by Frank Wilczek and Steven Weinberg.
ANSWER: axion [accept higglet; prompt on weakly interacting sub-eV particle or WISP]
[10m] Wilczek named the axion after a detergent brand because it “cleaned up” a problem named for charge conjugation symmetry and this symmetry. Chien-Shiung Wu showed that the weak force violates this symmetry.
ANSWER: parity symmetry [or P-symmetry; accept CP-symmetry; accept, but DO NOT REVEAL, strong-CP problem]
[10e] The Peccei–Quinn mechanism that produces the axion attempts to explain why this fundamental force seemingly does not exhibit CP-violation. This force holds the atomic nucleus together.
ANSWER: strong force [or strong interaction or strong nuclear force]
<Physics>
Summary
| 2024 ACF Winter at UC Berkeley | 2024-11-16 | Y | 3 | 23.33 | 100% | 67% | 67% |
| 2024 ACF Winter at Lehigh | 2024-11-16 | Y | 6 | 20.00 | 100% | 67% | 33% |
| 2024 ACF Winter at Northwestern | 2024-11-16 | Y | 9 | 18.89 | 100% | 67% | 22% |
| 2024 ACF Winter at Ohio State | 2024-11-16 | Y | 7 | 18.57 | 100% | 71% | 14% |
| 2024 ACF Winter at Online | 2024-11-16 | Y | 8 | 16.25 | 100% | 63% | 0% |
| 2024 ACF Winter at UBC | 2024-11-16 | Y | 3 | 16.67 | 100% | 67% | 0% |
| 2024 ACF Winter at Central Florida | 2024-11-16 | Y | 5 | 14.00 | 100% | 40% | 0% |
| 2024 ACF Winter at Oxford | 2024-11-16 | Y | 11 | 18.18 | 91% | 64% | 27% |
Data
| Michigan State B (UG) | Kenyon A (UG) | 0 | 10 | 10 | 20 |
| Michigan State C (UG) | CWRU A (UG) | 0 | 10 | 10 | 20 |
| Ohio State B (DII) | Pitt B (UG) | 0 | 10 | 10 | 20 |
| Michigan B | Ohio State C (DII) | 10 | 10 | 10 | 30 |
| Pitt A | Michigan D | 0 | 10 | 10 | 20 |
| CWRU B (UG) | CWRU D (DII) | 0 | 0 | 10 | 10 |
| Michigan C (UG) | Kenyon B (DII) | 0 | 0 | 10 | 10 |