Results 51 to 60 of about 4,206 (182)

Anatomy of $\varepsilon'/\varepsilon$ beyond the Standard Model

, 2019
We present for the first time a model-independent anatomy of the ratio $\varepsilon'/\varepsilon$ in the context of the $\Delta S = 1$ effective theory with operators invariant under QCD and QED and in the context of the Standard Model Effective Field ...
Aebischer, Jason, Bobeth, Christoph, Buras, Andrzej J., Straub, David M.   +3 more
core   +1 more source

Indirect Signs of the Peccei-Quinn Mechanism [PDF]

, 2018
In the Standard Model, the renormalization of the QCD vacuum angle $\theta$ is extremely tiny, and small $\theta$ is technically natural. In the general Standard Model effective field theory (SMEFT), however, $\Delta\theta$ is quadratically divergent ...
de Vries, Jordy, Draper, Patrick, Fuyuto, Kaori, Kozaczuk, Jonathan, Sutherland, Dave   +4 more
core   +2 more sources

Top, Higgs, diboson and electroweak fit to the Standard Model effective field theory

Journal of High Energy Physics, 2021
The search for effective field theory deformations of the Standard Model (SM) is a major goal of particle physics that can benefit from a global approach in the framework of the Standard Model Effective Field Theory (SMEFT).
John Ellis, Maeve Madigan, Ken Mimasu, Veronica Sanz, Tevong You   +4 more
doaj   +1 more source

Field reparametrization in SMEFT [PDF]

The European Physical Journal Plus, 2017
Debate topic for effective field theory (EFT) is the choice of a “basis” for ${\rm dim}= 6$ operators. Clearly all bases are equivalent as long as they are a “basis”, containing a minimal set of operators ...
openaire   +2 more sources

Yukawa enhancement of $Z$-mediated New Physics in $\Delta S = 2$ and $\Delta B = 2$ Processes

, 2017
We discuss Yukawa-enhanced contributions from $Z$-mediated new physics to down-type quark $\Delta F=2$ processes in the framework of the standard model gauge-invariant effective theory (SMEFT).
Bobeth, Christoph, Buras, Andrzej J., Celis, Alejandro, Jung, Martin   +3 more
core   +1 more source

Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD [PDF]

, 2016
We present the results of the computation of the next-to-leading order QCD corrections to the production cross section of a Higgs boson in association with a top-antitop pair at the LHC, including the three relevant dimension-six operators ($O_{t \varphi
Maltoni, Fabio, Vryonidou, Eleni, Zhang, Cen   +2 more
core   +2 more sources

The geometric SMEFT

, 2022
Effective field theories, like the Standard Model Effective Field Theory (SMEFT), are defined by a chosen field content and a set of symmetries, up to a cut off scale $Λ$. Usually, in order to perform calculations, gauge independent field re-definitions consistent with the symmetries of the theory are then used to redefine the fields.
openaire   +2 more sources

A package for renormalization group running in the SMEFT with sterile neutrinos

European Physical Journal C: Particles and Fields
Sterile neutrinos are well-motivated beyond the Standard Model (BSM) particles. The Standard Model Effective Field Theory (SMEFT) augmented with these new fields is known as the $$\nu $$ ν SMEFT.
Jason Aebischer, Tejhas Kapoor, Jacky Kumar   +2 more
doaj   +1 more source

A Lesson from RττK(*)$R_{\tau \tau }^{K^{(\ast )}}$ and RννK(*)$R_{\nu \nu }^{K^{(\ast )}}$ at Belle II

Fortschritte der Physik, Volume 72, Issue 1, January 2024.
Abstract Within the assumption of Left‐Handed (LH) New Physics (NP), the relations between B(B→K(*)τ+τ−)$\mathcal {B}(B\rightarrow K^{(\ast )} \tau ^+\tau ^-)$ and B(B→K(*)νν¯)$\mathcal {B}(B\rightarrow K^{(\ast )} \nu \bar{\nu })$ for several Beyond the Standard Model (BSM) scenarios are reviewed, commonly considered to explain the Lepton flavor ...
Arturo de Giorgi, Gioacchino Piazza
wiley   +1 more source

Higher dimensional operators in 2HDM

, 2017
We present a complete (non-redundant) basis of CP- and flavour-conserving six-dimensional operators in a two Higgs doublet model (2HDM). We include Z_2-violating operators as well.
Karmakar, Siddhartha, Rakshit, Subhendu
core   +1 more source