Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity
Abstract 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 o...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-03-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP03(2024)033 |
| _version_ | 1797267017594568704 |
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| author | Vincenzo Cirigliano Wouter Dekens Jordy de Vries Emanuele Mereghetti Tom Tong |
| author_facet | Vincenzo Cirigliano Wouter Dekens Jordy de Vries Emanuele Mereghetti Tom Tong |
| author_sort | Vincenzo Cirigliano |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-04-25T01:09:54Z |
| format | Article |
| id | doaj.art-f0cd8beda5b140708d02b769f66d03e3 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-25T01:09:54Z |
| publishDate | 2024-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-f0cd8beda5b140708d02b769f66d03e32024-03-10T12:04:33ZengSpringerOpenJournal of High Energy Physics1029-84792024-03-012024316910.1007/JHEP03(2024)033Anomalies in global SMEFT analyses. A case study of first-row CKM unitarityVincenzo Cirigliano0Wouter Dekens1Jordy de Vries2Emanuele Mereghetti3Tom Tong4Institute for Nuclear Theory, University of WashingtonInstitute for Nuclear Theory, University of WashingtonInstitute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of AmsterdamTheoretical Division, Los Alamos National LaboratoryCenter for Particle Physics Siegen, University of SiegenAbstract 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.https://doi.org/10.1007/JHEP03(2024)033SMEFTCKM ParametersElectroweak Precision Physics |
| spellingShingle | Vincenzo Cirigliano Wouter Dekens Jordy de Vries Emanuele Mereghetti Tom Tong Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity Journal of High Energy Physics SMEFT CKM Parameters Electroweak Precision Physics |
| title | Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity |
| title_full | Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity |
| title_fullStr | Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity |
| title_full_unstemmed | Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity |
| title_short | Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity |
| title_sort | anomalies in global smeft analyses a case study of first row ckm unitarity |
| topic | SMEFT CKM Parameters Electroweak Precision Physics |
| url | https://doi.org/10.1007/JHEP03(2024)033 |
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