scholarly journals A non-linear EFT description of gg → H H at NLO interfaced to POWHEG

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Gudrun Heinrich ◽  
Stephen P. Jones ◽  
Matthias Kerner ◽  
Ludovic Scyboz
Keyword(s):  
Shape Analysis ◽  
Effective Field Theory ◽  
Gluon Fusion ◽  
Top Quarks ◽  
Effective Field ◽  
Boson Pair ◽  
Anomalous Couplings ◽  
Boson Pair Production ◽  
Non Linear ◽  
Theory Framework

Abstract We present the implementation of Higgs boson pair production in gluon fusion within a non-linear Effective Field Theory framework containing five anomalous couplings for this process. The code, available within the POWHEG-BOX-V2, includes full NLO QCD corrections with massive top quarks. All five couplings can be modified by the user. We show mhh distributions at seven benchmark points provided by an mhh shape analysis at NLO and showered $$ {p}_T^{hh} $$ p T hh distributions resulting from an interface to PYTHIA-8 and HERWIG-7.2.

scholarly journals Anomalous couplings in Higgs-boson pair production at approximate NNLO QCD

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Daniel de Florian ◽  
Ignacio Fabre ◽  
Gudrun Heinrich ◽  
Javier Mazzitelli ◽  
Ludovic Scyboz
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Top Quark ◽  
Gluon Fusion ◽  
Effective Field ◽  
Boson Pair ◽  
Anomalous Couplings ◽  
Boson Pair Production ◽  
Coupling Parameters ◽  
The Impact

Abstract We combine NLO predictions with full top-quark mass dependence with approximate NNLO predictions for Higgs-boson pair production in gluon fusion, including the possibility to vary coupling parameters within a non-linear Effective Field Theory framework containing five anomalous couplings for this process. We study the impact of the anomalous couplings on various observables, and present Higgs-pair invariant-mass distributions at seven benchmark points characterising different mhh shape types. We also provide numerical coefficients for the approximate NNLO cross section as a function of the anomalous couplings at $$ \sqrt{s} $$ s = 14 TeV.

scholarly journals Resummation of non-global logarithms in cross sections with massive particles

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Marcel Balsiger ◽  
Thomas Becher ◽  
Andrea Ferroglia
Keyword(s):  
Field Theory ◽  
Cross Section ◽  
Cross Sections ◽  
Effective Field Theory ◽  
Top Quark ◽  
Parton Shower ◽  
Top Quarks ◽  
Effective Field ◽  
Group Evolution ◽  
Theory Framework

Abstract A factorization formalism for jet processes involving massive colored particles such as the top quark is developed, extending earlier results for the massless case. The factorization of soft emissions from the underlying hard process is implemented in an effective field theory framework, which forms the basis for the resummation of large logarithms. The renormalization group evolution giving rise to non-global logarithms is implemented into a parton shower code in the large-Nc limit. After a comparison of the massive and massless radiation patterns, the cross section for $$ t\overline{t} $$ t t ¯ production with a veto on additional central jet activity is computed, taking into account radiation both from the production and the decay of the top quarks. The resummation of the leading logarithms leads to an improved description of ATLAS measurements at $$ \sqrt{s} $$ s = 7 TeV.

scholarly journals Charged lepton flavour violating processes

2019 ◽  
Author(s):  
Adrian Signer
Keyword(s):  
Effective Field Theory ◽  
Charged Lepton ◽  
Experimental Situation ◽  
Specific Model ◽  
Effective Field ◽  
Charged Scalar ◽  
The Standard Model ◽  
Doubly Charged ◽  
Theory Framework ◽  
Lepton Flavour

Charged lepton flavour violating processes are naturally present in many extensions of the Standard Model. After a brief overview on the experimental situation, an effective-field-theory framework is described that allows to interpret and compare the various experiments in a consistent way. The usefulness of this approach is then illustrated in the context of a specific model with a doubly charged scalar.

CUSPS IN THE KAON DECAYS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 214-221
Author(s):  
AKAKI RUSETSKY
Keyword(s):  
Effective Field Theory ◽  
Neutral Pion ◽  
Effective Field ◽  
S Wave ◽  
Kaon Decays ◽  
Cusp Region ◽  
The Difference ◽  
Scattering Lengths ◽  
Theory Framework

We consider two ways of the experimental determination of the S-wave ππ scattering lengths: from K → 3π decays and from Ke4 decays. In both cases the unitary cusps, which emerge due to the difference in the charged and neutral pion masses, play a crucial role. We construct a systematic effective field theory framework which can be used to describe decay amplitudes in the cusp region.

scholarly journals Effective field theory: A modern approach to anomalous couplings

2013 ◽  
Vol 335 ◽  
pp. 21-32 ◽  
Author(s):  
Céline Degrande ◽  
Nicolas Greiner ◽  
Wolfgang Kilian ◽  
Olivier Mattelaer ◽  
Harrison Mebane ◽  
...  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Modern Approach ◽  
Anomalous Couplings

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
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