Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity

Cirigliano, Vincenzo; Dekens, Wouter; de Vries, Jordy; Mereghetti, Emanuele; Tong, Tom

doi:10.1007/jhep03(2024)033

Title: Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity

Journal Article · 05 March 2024 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep03(2024)033 · OSTI ID:2529472

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University of Washington, Seattle, WA (United States)
University of Amsterdam (The Netherlands); Nikhef, Amsterdam (The Netherlands)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
University of Siegen (Germany)

Recent developments in the Standard Model analysis of semileptonic charged-current processes involving light quarks have revealed ~ 3σ tensions in Cabibbo universality tests involving meson, neutron, and nuclear beta decays. In this paper, we explore beyond the Standard Model explanations of this so-called Cabibbo Angle Anomaly in the framework of the Standard Model Effective Field Theory (SMEFT), including not only low-energy charged current processes (‘L’), but also electroweak precision observables (‘EW’) and Drell-Yan collider processes (‘C’) that probe the same underlying physics across a broad range of energy scales. The resulting ‘CLEW’ framework not only allows one to test explanations of the Cabibbo Angle Anomaly, but is set up to provide near model-independent analyses with minimal assumptions on the flavor structure of the SMEFT operators. Besides the global analysis, we consider a large number of simpler scenarios, each with a subset of SMEFT operators, and investigate how much they improve upon the Standard Model fit. We find that the most favored scenarios, as judged by the Akaike Information Criterion, are those that involve right-handed charged currents. Additional interactions, namely oblique operators, terms modifying the Fermi constant, and operators involving right-handed neutral currents, play a role if the CDF determination of the W mass is included in the analysis.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); University of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: 89233218CNA000001; FG02-00ER41132; SC0023663

OSTI ID:: 2529472

Report Number(s):: LA-UR--23-31027

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2024; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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