Standard model Precision Electroweak tests at Acute Rapidities

Información del proyecto

SPEAR

Identificador del acuerdo de subvención: 865469

DOI

10.3030/865469

Proyecto cerrado

Fecha de la firma de la CE 30 Enero 2020

Fecha de inicio 1 Junio 2020

Fecha de finalización 31 Mayo 2026

Financiado con arreglo a

• EXCELLENT SCIENCE - European Research Council (ERC)

Coste total

€ 1 875 781,00

Aportación de la UE

€ 1 875 781,00

Coordinado por

UNIVERSITY OF WARWICK
United Kingdom

Periodic Reporting for period 3 - SPEAR (Standard model Precision Electroweak tests at Acute Rapidities)

Período documentado: 2023-06-01 hasta 2024-11-30

Resumen del contexto y de los objetivos generales del proyecto

The electroweak SM theory describes the electromagnetic and weak-nuclear forces in terms of three fundamental parameters.
A global fit of observables that relate to these parameters is sensitive to quantum-loop corrections involving possible fields beyond those of the SM.
Gaining a deeper understanding of the fundamental forces of nature is especially important for society since it has proven to lead to technological breakthroughs throughout history.
The discovery of physics beyond the SM is a holy grail in physics.
The sensitivity of this test is primarily limited by the precision of the measurement of the W boson mass.
The SPEAR project aims to exploit a previously unforeseen potential of the LHCb experiment in a new measurement of the W boson mass.
The project also aims to make a precision determination of a related parameter, the weak mixing angle, and a test of lepton universality with
W boson decays.

Trabajo realizado desde el comienzo del proyecto hasta el final del período abarcado por el informe y los principales resultados hasta la fecha

Within the first year of the project my team has delivered a first proof-of-principle measurement of the W boson mass with the LHCb experiment,
which was reported as a preliminary result in the prestigious CERN seminar series https://indico.cern.ch/event/1027304/.
This result was also one of the highlights in the bi-annual European Physical Society summer conference that followed soon after the CERN seminar.
This provides an solid foundation for achieving the objectives of WP1 of the project.
A scientific paper describing this analysis is now in the final stages of editorial review within the LHCb experiment, before it is submitted to a peer-reviewed
open access journal.
All team members have already presented the results at workshops, meetings and conferences.

Avances que van más allá del estado de la técnica e impacto potencial esperado (incluida la repercusión socioeconómica y las implicaciones sociales más amplias del proyecto hasta la fecha)

Within the first year of the project the first proof-of-principle measurement of the W boson mass already introduces several novel methodologies that are unique to this analysis.
This includes a simultaneous measurement of the W boson mass and a W-specific tune of event generators.
The analysis also made use of a simple new method for controlling charge-dependent curvature biases, which was developed by the PI
with collaborators https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-021-09016-9.

Title slide from CERN seminar on measurement of the W boson mass