quantum chromodynamics - 2025 PACE NSC

Question

Successors to Peccei–Quinn theory seek to explain why this theory, but not electroweak theory, preserves CP symmetry. For 10 points each:

[10m] Name this predominant theory of the gluon-mediated strong interaction among quarks.

ANSWER: quantum chromodynamics [or QCD]

[10h] These particles are the Goldstone bosons of Peccei–Quinn theory. Modern theories include "invisible" instances of these dark matter candidates that were independently theorized by Steven Weinberg and Frank Wilczek.

ANSWER: axions [or invisible axions]

[10e] Theories of axions are motivated by the anomalously small value for a QCD parameter denoted with this letter. Alongside phi, this is the most common Greek letter used to denote angles.

ANSWER: lowercase theta

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Data

Team	Opponent	Part 1	Part 2	Part 3	Total
Alabama Cyber Tech	Park Tudor	0	0	10	10
Audrain County AT	Carl Sandburg	10	10	10	30
Barrington	Centennial A	0	0	10	10
Carmel A	Winston Churchill B	10	0	10	20
Carmel B	Thomas Jefferson B	0	0	10	10
Centennial B	Uni School of Nashville A	0	0	10	10
Classen SAS	Homewood-Flossmoor	0	0	10	10
Detroit Catholic Central A	Uni School of Nashville B	0	0	10	10
Downingtown STEM	Walter Payton B	10	0	10	20
Eastchester	Coronado	10	10	10	30
Fremd	Chattahoochee B	0	0	10	10
Great Valley	Detroit Catholic Central C	0	0	0	0
Herron	Edina	0	0	10	10
Hunter A	Walter Payton A	0	0	10	10
Hunter B	Hinsdale Central A	10	10	10	30
Innovation Academy A	Russell	0	0	10	10
Innovation Academy B	Belmont	10	0	10	20
Irvington	Grosse Pointe South	10	0	10	20
Lambert A	Montgomery Blair B	10	0	10	20
Lexington	Solon	10	10	10	30
Lindbergh	Glenbrook South	10	10	10	30
Montgomery Blair A	Lincoln-Way East B	10	10	10	30
North Quincy	Seven Lakes	10	0	10	20
Northmont	White Pigeon	0	0	10	10
Northside College Prep	Strake Jesuit B	0	0	10	10
Northview	Georgetown Day	10	0	10	20
Okemos	Adlai E. Stevenson A	0	0	10	10
Page	Johns Creek	0	0	10	10
Parkway West	Yukon B	0	0	10	10
Quince Orchard	Strake Jesuit A	0	0	10	10
Richard Montgomery	Milton	10	10	10	30
Saint Joseph	Uni of Illinois Laboratory	0	0	10	10
Saratoga	Detroit Catholic Central B	10	0	10	20
Thomas Jefferson A	Fairfield County AT	10	0	10	20
Thomas Jefferson C	Lambert B	10	10	10	30
Virginia	Chattahoochee A	0	0	10	10
Walker	Thomas Jefferson D	0	0	10	10
Wayzata	Thomas Jefferson E	10	10	10	30
West Point	Lee's Summit	0	0	10	10
Westwood	Lincoln-Way East A	0	0	0	0
Winston Churchill A	Kane County AT	0	0	10	10
Yukon A	Adlai E. Stevenson B	0	0	10	10

Summary

Tournament	Edition	Exact Match?	Heard	PPB	Easy %	Medium %	Hard %
2025 PACE NSC	06/07/2025	Y	42	15.95	95%	43%	21%