BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Probing EFT Wilson Coefficients in the Wtb vertex at the HL-LHC DTSTART:20250527T140000Z DTEND:20250527T160000Z DTSTAMP:20260930T164825Z UID:77306d5c-859f-4ad0-909b-dfd7e8821fa9 SEQUENCE:3 CREATED:20250526T145908Z DESCRIPTION:The Wtb vertex\, central to top quark phenomenology\, provides a unique window into potential new physics beyond the Standard Model\, pa rticularly through the framework of Effective Field Theory (EFT).This thes is presents a comprehensive projection for the High Luminosity phase of th e LHC (HL-LHC) of constraints on dimension-6 EFT operators affecting the W tb interaction\, using a global analysis that simultaneously incorporates multiple observables\, including single top production cross sections\, W boson helicity fractions\, and angular asymmetries\, across several top qu ark production and decay modes. A novel fitting methodology is implemented to treat EFT Wilson coefficients consistently\, avoiding oversimplifying assumptions made in more traditional approaches. Results show that althoug h the projected sensitivities match current experimental bounds\, this und erwhelming improvement challenges the justification of HL-LHC expectations and underscores the need for more general and rigorous methodologies. Thi s work demonstrates that global fits can yield more conservative yet robus t limits and calls into question the assumptions embedded in prevalent ana lysis strategies. LAST-MODIFIED:20250526T150233Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/en/events/probing-eft-wilson-coeffici ents-in-the-wtb-vertex-at-the-hl-lhc/ X-ALT-DESC;FMTTYPE=text/html:

The Wtb vert ex\, central to top quark phenomenology\, provides a unique window into po tential new physics beyond the Standard Model\, particularly through the f ramework of Effective Field Theory (EFT).

This thesis presents a comprehensive projection for the High Luminosity phase of the LHC (HL-LHC) of constraints on dimension-6 EFT operators affecting the Wtb inte raction\, using a global analysis that simultaneously incorporates multipl e observables\, including single top production cross sections\, W boson helicity fractions\, and angular asymmetries\, across several top qu ark production and decay modes.

A novel fitting methodology is i mplemented to treat EFT Wilson coefficients consistently\, avoiding oversi mplifying assumptions made in more traditional approaches. Results show th at although the projected sensitivities match current experimental bounds\ , this underwhelming improvement challenges the justification of HL-LHC ex pectations and underscores the need for more general and rigorous methodol ogies.

This work demonstrates that global fits can yield more co nservative yet robust limits and calls into question the assumptions embed ded in prevalent analysis strategies.

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