Editing Chiral anomaly (section)

{{Use American English|date=January 2019}}{{Short description|Non-conservation of chiral current in physics}}
In [[theoretical physics]], a '''chiral anomaly''' is the [[anomaly (physics)|anomalous]] [[nonconservation]] of a [[chirality (physics)|chiral]] current. In everyday terms, it is analogous to a sealed box that contained equal numbers of left and right-handed [[Bolt (fastener)|bolts]], but when opened was found to have more left than right, or vice versa.

Such events are expected to be prohibited according to classical [[conservation law]]s, but it is known there must be ways they can be broken, because we have evidence of [[CP violation|charge–parity non-conservation ]] ("CP violation"). It is possible that other imbalances have been caused by breaking of a ''chiral law'' of this kind. Many physicists suspect that the fact that the observable universe contains [[baryon asymmetry|more matter than antimatter]] is caused by a chiral anomaly.<ref>
{{cite journal
 |last1=Dolgov |first1=A. D.
 |year=1997
 |title=Baryogenesis, 30 years after
 |journal=[[Surveys in High Energy Physics]]
 |volume=13 |issue=1–3 |pages=83–117
 |arxiv=hep-ph/9707419
 |bibcode=1998SHEP...13...83D
 |doi=10.1080/01422419808240874
|s2cid=119499400
 }}
</ref> Research into [[chiral symmetry breaking]] laws is a major endeavor in particle physics research at this time.{{Citation needed|date=March 2024}}{{When|date=March 2024}}