Results 71 to 80 of about 4,206 (182)

Gauge-invariant implications of the LHCb measurements on Lepton-Flavour Non-Universality

, 2017
We study the implications of the recent measurements of $R_K$ and $R_{K^*}$ by the LHCb collaboration. We do that by adopting a model-independent approach based on the Standard Model Effective Field Theory (SMEFT), in which the dominant new physics ...
Celis, Alejandro, Fuentes-Martin, Javier, Vicente, Avelino, Virto, Javier   +3 more
core   +1 more source

Global SMEFT Fits at Future Colliders [PDF]

, 2022
Jorge de Blas, Y. Du, Christophe Grojean, Jiayin Gu, Víctor Miralles, Michael E. Peskin, Junping Tian, M. Vos, Eleni Vryonidou   +8 more
openalex   +1 more source

A framework for simultaneous fit of QCD and BSM parameters with xFitter

European Physical Journal C: Particles and Fields
An extension of the xFitter open-source program for QCD analyses is presented, allowing for a polynomial parameterization of the dependence of physical observables on theoretical parameters.
Xiao-Min Shen, Simone Amoroso, Jun Gao, Katerina Lipka, Oleksandr Zenaiev   +4 more
doaj   +1 more source

Dimension-8 SMEFT matching conditions for the low-energy effective field theory

Journal of High Energy Physics, 2023
In particle physics, the modern view is to categorize things in terms of effective field theories (EFTs). Above the weak scale, we have the SMEFT, formed when the heavy new physics (NP) is integrated out, and for which the Standard Model (SM) is the ...
Serge Hamoudou, Jacky Kumar, David London   +2 more
doaj   +1 more source

A $$ {\mathbbm{CP}}^2 $$ SMEFT

Journal of High Energy Physics
Abstract An extension of the Standard Model is proposed, where the Higgs field is valued in the complex projective plane $$ {\mathbbm{CP}}^2 $$ CP 2 , rather than
openaire   +4 more sources

Production of two, three, and four Higgs bosons: where SMEFT and HEFT depart [PDF]

, 2023
Rafael L. Delgado, Raquel Gómez-Ambrosio, Javier Martínez-Martín, Alexandre Salas-Bernárdez, Juan José Sanz-Cillero   +4 more
openalex   +1 more source

Improving the global SMEFT picture with bounds on neutrino NSI

Journal of High Energy Physics
We analyze how neutrino oscillation and coherent elastic neutrino-nucleus scattering data impact the global SMEFT fit. We first review the mapping between the SMEFT parameters and the so-called NSI framework, commonly considered in the neutrino ...
Pilar Coloma, Enrique Fernández-Martínez, Jacobo López-Pavón, Xabier Marcano, Daniel Naredo-Tuero, Salvador Urrea   +5 more
doaj   +1 more source

Incorporating doubly resonant $W^\pm$ data in a global fit of SMEFT parameters to lift flat directions [PDF]

, 2016
We calculate the double pole contribution to two to four fermion scattering through $W^{\pm}$ currents at tree level in the Standard Model Effective Field Theory (SMEFT).
Berthier, Laure, Bjørn, Mikkel, Trott, Michael   +2 more
core   +2 more sources

An EWPD SMEFT likelihood for the LHC — and how to improve it with measurements of W and Z boson properties

Journal of High Energy Physics
This paper presents a computer code for analyzing electroweak precision data (EWPD) in the framework of the Standard Model Effective Field Theory (SMEFT), highlights the importance of recent ATLAS and CMS precision measurements, and introduces a novel ...
Hannes Mildner
doaj   +1 more source

Use and reuse of SMEFT

, 2020
In this work we address three questions: can we successfully describe (observed) deviations from the standard model in the SMEFT language? Can we learn something about the underlying, beyond the standard model, physics using the SMEFT language? If no deviation is observed, how to proceed?
David, André, Passarino, Giampiero
openaire   +2 more sources