Strong CP problem

en

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Strong CP problem

Quality:

Strong CP problem - the observation that the θ angle in quantum chromodynamics that would violate CP symmetry seems fine-tuned to 0. Article “Strong CP problem” in English Wikipedia has 19.5 points for quality (as of July 1, 2025). The article contains 10 references and 4 sections.

This article has the best quality in Japanese Wikipedia. However, this article is the most popular in English version.

Since the creation of article “Strong CP problem”, its content was written by 50 registered users of English Wikipedia and edited by 73 registered Wikipedia users in all languages.

The article is cited 77 times in English Wikipedia and cited 146 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #43977 in July 2017
  • Global: #100909 in July 2017

The highest popularity rank from 2008:

  • Local (English): #104964 in July 2012
  • Global: #182650 in July 2012

There are 5 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Japanese (ja)
強いCP問題
33.2065
2English (en)
Strong CP problem
19.4687
3Spanish (es)
Problema CP fuerte
11.7753
4Catalan (ca)
Problema CP fort
10.2086
5Italian (it)
Problema della CP forte
5.9371
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "Strong CP problem" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Strong CP problem
517 286
2Japanese (ja)
強いCP問題
22 703
3Spanish (es)
Problema CP fuerte
10 509
4Italian (it)
Problema della CP forte
8 712
5Catalan (ca)
Problema CP fort
576
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2025

The most popular language versions of the article "Strong CP problem" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Strong CP problem
3 469
2Japanese (ja)
強いCP問題
267
3Italian (it)
Problema della CP forte
55
4Spanish (es)
Problema CP fuerte
46
5Catalan (ca)
Problema CP fort
30
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "Strong CP problem" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Strong CP problem
50
2Italian (it)
Problema della CP forte
13
3Japanese (ja)
強いCP問題
6
4Catalan (ca)
Problema CP fort
2
5Spanish (es)
Problema CP fuerte
2
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2025

Language versions of the article "Strong CP problem" with the highest AI in June 2025
#LanguageAI awardRelative AI
1Catalan (ca)
Problema CP fort
0
2English (en)
Strong CP problem
0
3Spanish (es)
Problema CP fuerte
0
4Italian (it)
Problema della CP forte
0
5Japanese (ja)
強いCP問題
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "Strong CP problem" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Strong CP problem
77
2Japanese (ja)
強いCP問題
31
3Catalan (ca)
Problema CP fort
20
4Italian (it)
Problema della CP forte
11
5Spanish (es)
Problema CP fuerte
7
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2025:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2025:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
caCatalan
Problema CP fort
enEnglish
Strong CP problem
esSpanish
Problema CP fuerte
itItalian
Problema della CP forte
jaJapanese
強いCP問題

Popularity rank trends

Best Rank English:
#104964
07.2012
Global:
#182650
07.2012

AI rank trends

Best Rank English:
#43977
07.2017
Global:
#100909
07.2017

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Strong CP problem from Wikipedia articles about Axion, List of unsolved problems in physics, Physics beyond the Standard Model, CP violation and Peccei–Quinn theory. Whereas reading the article about Strong CP problem people most often go to Wikipedia articles on CP violation, Axion, Quantum chromodynamics, Peccei–Quinn theory and Fine-tuning.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

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About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information