axion - 2024 ACF Winter at Online

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]

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Summary


2024 ACF Winter at UC Berkeley	2024-11-16	Y	3	23.33	100%	67%	67%
2024 ACF Winter at Brandeis	2024-11-16	Y	10	15.00	90%	50%	10%
2024 ACF Winter at Clemson	2024-11-16	Y	5	14.00	100%	20%	20%
2024 ACF Winter at Lehigh	2024-11-16	Y	5	22.00	100%	80%	40%
2024 ACF Winter at Lehigh	2024-11-16	Y	1	20.00	100%	100%	0%
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	10	19.00	100%	60%	30%

Data


Arkansas	McGill E	0	10	10
NYU A	Central Oklahoma	10	10	20
Mississippi State	Vassar B	10	10	20
Texas B	Missouri	0	10	10
WUSTL A	Ole Miss	10	10	20
Texas A	NYU B	10	10	20
Texas C	Texas D	0	10	10
Vassar A	Oregon State	10	10	20