On the non-minimal character of the SMEFT

Research output: Contribution to journalJournal articlepeer-review

Documents

When integrating out unknown new physics sectors, what is the minimal character of the Standard Model Effective Field Theory (SMEFT) that can result? In this paper we focus on a particular aspect of this question: “How can one obtain only one dimension six operator in the SMEFT from a consistent tree level matching onto an unknown new physics sector?” We show why this requires conditions on the ultraviolet field content that do not indicate a stand alone ultraviolet complete scenario. Further, we demonstrate how a dynamical origin of the ultraviolet scales assumed to exist in order to generate the masses of the heavy states integrated out generically induces more operators. Therefore, our analysis indicates that the infrared limit captured from a new sector in consistent matchings induces multiple operators in the SMEFT quite generically. Global data analyses in the SMEFT can and should accommodate this fact.

Original languageEnglish
JournalPhysics Letters B
Volume770
Pages (from-to)108-116
Number of pages9
ISSN0370-2693
DOIs
Publication statusPublished - 2017

Number of downloads are based on statistics from Google Scholar and www.ku.dk


No data available

ID: 196204934