Benoît Assi
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View article: Effective Field Theory Perspective On King Non-linearity
Effective Field Theory Perspective On King Non-linearity Open
Precision spectroscopic measurements of isotope shifts have recently reached a high level of accuracy. Tests of King non-linearity (NL) along isotope chains have been proposed as a tool to search for fifth-force mediators. At the same time…
View article: Characterizing the hadronization of parton showers using the HOMER method
Characterizing the hadronization of parton showers using the HOMER method Open
We update the HOMER method, a technique to solve a restricted version of the inverse problem of hadronization – extracting the Lund string fragmentation function f(z) from data using only observable information. Here, we demonstrate …
View article: Post-hoc reweighting of hadron production in the Lund string model
Post-hoc reweighting of hadron production in the Lund string model Open
We present a method for reweighting flavor selection in the Lund string fragmentation model. This is the process of calculating and applying event weights enabling fast and exact variation of hadronization parameters on pre-generated event…
View article: Composite quarks and leptons with embedded QCD
Composite quarks and leptons with embedded QCD Open
We construct a model of quark and lepton compositeness based on an SU(15) gauge interaction that confines chiral preons, which are also charged under the weakly coupled SU(4)PS×SU(2)L×SU(2)R gauge group. The breaking of the latter, down to…
View article: QCD Theory Meets Information Theory
QCD Theory Meets Information Theory Open
We present a novel technique to incorporate precision calculations from quantum chromodynamics into fully differential particle-level Monte Carlo simulations. By minimizing an information-theoretic quantity subject to constraints, our rewe…
View article: Electron EDM and Γ(μ → eγ) in the 2HDM
Electron EDM and Γ(μ → eγ) in the 2HDM Open
A bstract We present the first complete two-loop calculation of the electric dipole moment of the electron, as well as the rates of the lepton-flavor violating decays μ → e + γ and τ → e/μ + γ , in the unconstrained two-Higgs doublet model…
View article: Renormalizing two-fermion operators in the SMEFT via supergeometry
Renormalizing two-fermion operators in the SMEFT via supergeometry Open
View article: Energy-Enhanced Expansion of the Standard Model Effective Field Theory
Energy-Enhanced Expansion of the Standard Model Effective Field Theory Open
We formalize energy-scaling arguments in the Standard Model Effective Field Theory (SMEFT) to estimate effects of operators up to dimension ten. Introducing a classification based on the number of external legs and an energy-counting param…
View article: Energy-enhanced dimension eight SMEFT effects in VBF Higgs production
Energy-enhanced dimension eight SMEFT effects in VBF Higgs production Open
A bstract We study Higgs boson production via vector boson fusion at the LHC, focusing on the process pp → H + jj and capturing the leading energy-enhanced contributions within the Standard Model Effective Field Theory (SMEFT) up to order …
View article: QCD Theory meets Information Theory
QCD Theory meets Information Theory Open
We present a novel technique to incorporate precision calculations from quantum chromodynamics into fully differential particle-level Monte-Carlo simulations. By minimizing an information-theoretic quantity subject to constraints, our rewe…
View article: Composite quarks and leptons with embedded QCD
Composite quarks and leptons with embedded QCD Open
We construct a model of quark and lepton compositeness based on an $SU(15)$ gauge interaction that confines chiral preons, which are also charged under the weakly-coupled $SU(4)_{\rm PS} \times SU(2)_L\times SU(2)_R$ gauge group. The break…
View article: Tetraquarks made of sufficiently unequal-mass heavy quarks are bound in QCD
Tetraquarks made of sufficiently unequal-mass heavy quarks are bound in QCD Open
Tetraquarks, bound states composed of two quarks and two antiquarks, have been the subject of intense study but are challenging to understand from first principles. We apply variational and Green’s function Monte Carlo methods to compute t…
View article: Energy-Enhanced Dimension Eight SMEFT Effects in VBF Higgs production
Energy-Enhanced Dimension Eight SMEFT Effects in VBF Higgs production Open
We study Higgs boson production via vector boson fusion at the LHC, focusing on the process $pp \to H + jj$ and capturing the leading energy-enhanced contributions within the Standard Model Effective Field Theory (SMEFT) up to order $1/Λ^4…
View article: Digitization and subduction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>N</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> gauge theories
Digitization and subduction of gauge theories Open
The simulation of lattice gauge theories on quantum computers necessitates digitizing gauge fields. One approach involves substituting the continuous gauge group with a discrete subgroup, but the implications of this approximation still ne…
View article: New approach to QCD final-state evolution in processes with massive partons
New approach to QCD final-state evolution in processes with massive partons Open
We present an algorithm for massive parton evolution which is based on the differentially accurate simulation of soft-gluon radiation by means of a nontrivial azimuthal angle dependence of the splitting functions. The kinematics mapping is…
View article: Digitization and subduction of $SU(N)$ gauge theories
Digitization and subduction of $SU(N)$ gauge theories Open
The simulation of lattice gauge theories on quantum computers necessitates digitizing gauge fields. One approach involves substituting the continuous gauge group with a discrete subgroup, but the implications of this approximation still ne…
View article: Fermion geometry and the renormalization of the Standard Model Effective Field Theory
Fermion geometry and the renormalization of the Standard Model Effective Field Theory Open
A bstract The geometry of field space governs on-shell scattering amplitudes. We formulate a geometric description of effective field theories which extends previous results for scalars and gauge fields to fermions. The field-space geometr…
View article: Baryons, multihadron systems, and composite dark matter in nonrelativistic QCD
Baryons, multihadron systems, and composite dark matter in nonrelativistic QCD Open
We provide a formulation of potential nonrelativistic quantum chromodynamics (pNRQCD) suitable for calculating binding energies and matrix elements of generic hadron and multihadron states made of heavy quarks in SU(Nc) gauge th…
View article: Tetraquarks made of sufficiently unequal-mass heavy quarks are bound in QCD
Tetraquarks made of sufficiently unequal-mass heavy quarks are bound in QCD Open
Tetraquarks, bound states composed of two quarks and two antiquarks, have been the subject of intense study but are challenging to understand from first principles. We apply variational and Green's function Monte Carlo methods to compute t…
View article: Fermion Geometry and the Renormalization of the Standard Model Effective Field Theory
Fermion Geometry and the Renormalization of the Standard Model Effective Field Theory Open
The geometry of field space governs on-shell scattering amplitudes. We formulate a geometric description of effective field theories which extends previous results for scalars and gauge fields to fermions. The field-space geometry reorgani…
View article: A new approach to QCD final-state evolution in processes with massive partons
A new approach to QCD final-state evolution in processes with massive partons Open
We present an algorithm for massive parton evolution which is based on the differentially accurate simulation of soft-gluon radiation by means of a non-trivial azimuthal angle dependence of the splitting functions. The kinematics mapping i…
View article: Baryons, multi-hadron systems, and composite dark matter in non-relativistic QCD
Baryons, multi-hadron systems, and composite dark matter in non-relativistic QCD Open
We provide a formulation of potential non-relativistic quantum chromodynamics (pNRQCD) suitable for calculating binding energies and matrix elements of generic hadron and multi-hadron states made of heavy quarks in $SU(N_c)$ gauge theory u…
View article: Matching the Standard Model to heavy-quark effective theory and nonrelativistic QCD
Matching the Standard Model to heavy-quark effective theory and nonrelativistic QCD Open
View article: Proton decay from quark and lepton compositeness
Proton decay from quark and lepton compositeness Open
A bstract Within a chiral SU(15) gauge theory in which the Standard Model fermions are bound states of massless preons, we show that proton-decay operators are likely induced at the compositeness scale, Λ pre . Our estimate of the limit im…
View article: Massive two-loop heavy particle diagrams
Massive two-loop heavy particle diagrams Open
We determine the master integrals for vertex and propagator diagrams that appear in effective field theories containing heavy fields. The integrals involve at least one heavy line, and the standard lines include an arbitrary mass scale. Th…
View article: Matching the Standard Model to Heavy-Quark Effective Theory and Nonrelativistic QCD
Matching the Standard Model to Heavy-Quark Effective Theory and Nonrelativistic QCD Open
We find the leading electroweak corrections to the Lagrangians of heavy-quark effective theory and nonrelativistic QCD. These corrections appear in the Wilson coefficients of the two- and four-quark operators and are considered here at one…
View article: Static Potential of the Standard Model and Spontaneously Broken Theories
Static Potential of the Standard Model and Spontaneously Broken Theories Open
We consider the static potential in theories exhibiting spontaneous symmetry breaking. We use our findings to calculate the static potential of the Standard Model at one-loop order. We do so in both the Wilson loop and scattering amplitude…
View article: Electroweak Form Factor in Sudakov and Threshold Regimes with Effective Field Theories
Electroweak Form Factor in Sudakov and Threshold Regimes with Effective Field Theories Open
We compute the massive gauge and scalar corrections to form factors in both the Sudakov and threshold regimes up to and including two-loop orders. The corrections are calculated for processes involving two external fermions and scalars in …