scholarly journals EW corrections to $e^+ e^-\rightarrow \gamma Z,\, ZZ$ at LEP2 in an effective field theory framework

2000 ◽  
Author(s):  
Dumm Daniel Alberto Gomez
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Theory Framework

scholarly journals Three and four harmonically trapped particles in an effective-field-theory framework

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
J. Rotureau ◽  
I. Stetcu ◽  
B. R. Barrett ◽  
M. C. Birse ◽  
U. van Kolck
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Trapped Particles ◽  
Theory Framework

scholarly journals Effective field theory for hydrodynamics without boosts

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Jácome Armas ◽  
Akash Jain
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Fluid Velocity ◽  
Transport Coefficients ◽  
Effective Field ◽  
Covariant Formulation ◽  
Diffusion Mode ◽  
Sound Modes ◽  
Shear Modes ◽  
Theory Framework

We formulate the Schwinger-Keldysh effective field theory of hydrodynamics without boost symmetry. This includes a spacetime covariant formulation of classical hydrodynamics without boosts with an additional conserved particle/charge current coupled to Aristotelian background sources. We find that, up to first order in derivatives, the theory is characterised by the thermodynamic equation of state and a total of 29 independent transport coefficients, in particular, 3 hydrostatic, 9 non-hydrostatic non-dissipative, and 17 dissipative. Furthermore, we study the spectrum of linearised fluctuations around anisotropic equilibrium states with non-vanishing fluid velocity. This analysis reveals a pair of sound modes that propagate at different speeds along and opposite to the fluid flow, one charge diffusion mode, and two distinct shear modes along and perpendicular to the fluid velocity. We present these results in a new hydrodynamic frame that is linearly stable irrespective of the boost symmetry in place. This provides a unified covariant stable approach for simultaneously treating Lorentzian, Galilean, and Lifshitz fluids within an effective field theory framework and sets the stage for future studies of non-relativistic intertwined patterns of symmetry breaking.

scholarly journals Multi-track displaced vertices at B-factories

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Mason Acevedo ◽  
Albany Blackburn ◽  
Nikita Blinov ◽  
Brian Shuve ◽  
Mavis Stone
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Large Range ◽  
Effective Field ◽  
Higgs Bosons ◽  
Approximate Symmetries ◽  
Low Background ◽  
Hidden Sector ◽  
Displaced Vertex ◽  
Theory Framework

Abstract We propose a program at B-factories of inclusive, multi-track displaced vertex searches, which are expected to be low background and give excellent sensitivity to non-minimal hidden sectors. Multi-particle hidden sectors often include long-lived particles (LLPs) which result from approximate symmetries, and we classify the possible decays of GeV-scale LLPs in an effective field theory framework. Considering several LLP production modes, including dark photons and dark Higgs bosons, we study the sensitivity of LLP searches with different number of displaced vertices per event and track requirements per displaced vertex, showing that inclusive searches can have sensitivity to a large range of hidden sector models that are otherwise unconstrained by current or planned searches.

scholarly journals Probing the nonunitarity of the leptonic mixing matrix at the CEPC

2016 ◽  
Vol 31 (33) ◽  
pp. 1644006 ◽  
Author(s):  
Stefan Antusch ◽  
Oliver Fischer
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
Neutrino Masses ◽  
Performance Parameters ◽  
The Standard Model ◽  
Mixing Matrix ◽  
Theory Framework

The nonunitarity of the leptonic mixing matrix is a generic signal of new physics aiming at the generation of the observed neutrino masses. We discuss the Minimal Unitarity Violation (MUV) scheme, an effective field theory framework which represents the class of extensions of the Standard Model (SM) by heavy neutral leptons, and discuss the present bounds on the nonunitarity parameters as well as estimates for the sensitivity of the CEPC, based on the performance parameters from the preCDR.

scholarly journals ELECTROMAGNETIC PROCESSES IN χEFT

2009 ◽  
Vol 24 (11n13) ◽  
pp. 931-936 ◽  
Author(s):  
S. PASTORE ◽  
R. SCHIAVILLA ◽  
J. L. GOITY
Keyword(s):  
Field Theory ◽  
Circular Polarization ◽  
Cross Section ◽  
Effective Field Theory ◽  
Magnetic Moments ◽  
Effective Field ◽  
Polarization Parameter ◽  
Chiral Effective Field Theory ◽  
Electromagnetic Processes ◽  
Theory Framework

Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, Δ isobars, and pions up to N2LO, i.e. ignoring loop corrections, are used in a study of neutron radiative captures on protons and deuterons at thermal energies, and of A=2 and 3 nuclei magnetic moments. With the strengths of the Δ-excitation currents determined to reproduce the n-p cross section and isovector combination of the trinucleon magnetic moments, we find that the cross section and photon circular polarization parameter, measured respectively in n-d and [Formula: see text] processes, are significantly underpredicted by theory.

scholarly journals Hydrodynamic effective field theory and the analyticity of hydrostatic correlators

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Akash Jain ◽  
Pavel Kovtun ◽  
Adam Ritz ◽  
Ashish Shukla
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Correlation Functions ◽  
Longitudinal Velocity ◽  
Effective Field ◽  
Density Fluctuations ◽  
Relativistic Hydrodynamics ◽  
Finite Frequency ◽  
Sound Modes ◽  
Theory Framework

Abstract We study one-loop corrections to retarded and symmetric hydrostatic correlation functions within the Schwinger-Keldysh effective field theory framework for relativistic hydrodynamics, focusing on charge diffusion. We first consider the simplified setup with only diffusive charge density fluctuations, and then augment it with momentum fluctuations in a model where the sound modes can be ignored. We show that the loop corrections, which generically induce non-analyticities and long-range effects at finite frequency, non-trivially preserve analyticity of retarded correlation functions in spatial momentum due to the KMS constraint, as a manifestation of thermal screening. For the purposes of this analysis, we develop an interacting field theory for diffusive hydrodynamics, seen as a limit of relativistic hydrodynamics in the absence of temperature and longitudinal velocity fluctuations.

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