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Tim Cohen (CERN)02/06/2025, 09:00
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Jose Santiago (Universidad de Granada (ES))02/06/2025, 09:05
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Nudžeim Selimović (INFN Padova)02/06/2025, 09:35
I will present the classification of physical operators in the most general bosonic effective gauge theory up to dimension six. Building on this classification, I will discuss the complete one-loop anomalous dimension, computed using both unitarity-based on-shell techniques and geometric methods. This analysis fully accounts for operator mixing across different dimensions and applies broadly...
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FUENSANTA VILCHES BRAVO (Universidad de Granada)02/06/2025, 09:55
This is the third of a series of works aimed at renormalizing the Standard Model effective field theory at one loop and to order $1/\Lambda^4$, with $\Lambda$ being the new physics cut-off. In this occasion, we concentrate on the running of two-fermion operators induced by pairs of dimension-six interactions. We work mostly off-shell, for which we obtain and provide a new and explicitly...
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Andrés Vásquez (University of Bonn)02/06/2025, 10:15
We present a new Mathematica package with the purpose of performing multi-loop computations. ANATAR simplifies Dirac and colour algebras by using FORM and integrates several existing tools designed for higher-order computations, which makes it very efficient without compromising user-friendliness and flexibility. Support for any BSM model with the same gauge group as the SM is provided, and in...
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Dr Anders Eller Thomsen (University of Bern)02/06/2025, 11:00
Functional methods are a popular choice for various RG and EFT matching calculations, although many of the techniques have so far been limited to one-loop calculations. With the increasing demand for precision calculations, we have developed new, practical methods for the multi-loop level. In this talk, I will discuss these new techniques, contrast and compare them with ordinary diagrammatic...
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Lukas Born02/06/2025, 11:30
The Standard Model Effective Field Theory (SMEFT) provides a powerful framework for parameterizing potential new physics in a model-independent way. In order to analyze data from experiments across different energy scales and extrapolate UV physics effects, it is crucial to know the renormalization group evolution (RGE) of SMEFT operators. In this talk, I will present the results for the...
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Renato Fonseca (University of Granada)02/06/2025, 11:50
There is growing interest in using functional methods for multi-loop calculations, such as effective field theory matching and the calculation of renormalization group equations. Beyond one loop, instead of evaluating functional traces, one must perform tensor contractions associated with certain graphs. In this talk I will discuss my ongoing work on FunGraphs, a package that aims to automate...
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Giuseppe Ventura02/06/2025, 12:10
We compute the contributions of CP-conserving operators in the dimension-six SMEFT to the two-loop renormalisation constants of quark and gluon fields. We work with the background-field method, which allows us to extract the contribution of these operators to the two-loop running of the top mass and the strong coupling constant. We discuss the mixing with the unphysical operators required for...
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Luca Mantani (IFIC, Valencia)02/06/2025, 14:00
We assess the impact of Renormalisation Group Equations (RGEs) in global SMEFT fits, incorporating QCD, electroweak, and Yukawa corrections. By assigning characteristic energy scales to LEP and LHC cross-sections, we quantify RGE effects on current and projected fits at the HL-LHC and FCC-ee. Additionally, we evaluate the role of RGEs in the sensitivity of these colliders to UV models matched...
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Aleks Smolkovic (Jozef Stefan Institute)02/06/2025, 14:20
We discuss a novel open-source Python package, jelli: a JAX-based EFT likelihood, which provides an easy-to-use and highly efficient framework particularly suited to global SMEFT/WET analyses and the phenomenology of heavy new physics models. The nature of the tool is generic, allowing a differentiable high-dimensional likelihood to be constructed from any set of observables and measurements...
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Dr Tom Tong (University Siegen)02/06/2025, 14:40
SMEFT global analyses commonly encounter two major challenges:
1. An incomplete set of observables.
2. Ad-hoc flavour assumptions.
These issues significantly undermine the reliability and applicability of the results.In this talk, I propose the CLEW framework for a complete global analysis free of flavour assumptions. By integrating both high- and low-energy data, our framework is able...
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Alessandro Calandri (Università & INFN, Firenze (IT))02/06/2025, 15:00
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Despoina Sampsonidou (University of Oregon (US))02/06/2025, 16:00
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Riccardo Bartocci02/06/2025, 16:30
Global analyses in the SMEFT framework provide a powerful tool to explore new physics. Combining diverse observables is essential to resolve degeneracies among Wilson coefficients, especially since measurements occur at different energy scales, accounting properly for renormalisation group evolution (RGE) is crucial. In this talk, I examine the impact of RGE on a global analysis under flavour...
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Alejo Nahuel Rossia (University of Padua and INFN Sezione di Padova)02/06/2025, 16:50
Motivated by the updates of the ATLAS and CMS projections of Higgs pair production at the HL-LHC and the release of the Feasibility Study of the FCC-ee, we revisit the sensitivity of the global SMEFT analysis to deformations of the Higgs trilinear self-coupling $\lambda_3$.
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We critically reassess the additional information that would be provided by the FCC-ee through NLO corrections to $Zh$... -
Nicola Valori - (University of Valencia & IFIC)02/06/2025, 17:10
The Electric Dipole Moment of the electron (eEDM) is typically investigated in experiments using paramagnetic molecules. However, the physical observable in these searches consists in a linear combination of CP-violating interactions, rather than the eEDM alone, which is commonly referred to as the equivalent EDM of the system. Assuming the presence of new CP-odd physics from heavy degrees of...
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Julie Pagès (University of California, San Diego)03/06/2025, 09:00
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Gauthier Durieux (CP3 - UCLouvain)03/06/2025, 09:30
The matching of UV models on their low-energy EFT can be obtained from a dispersion relation, analogous to the one leading to positivity constraints but generalised beyond four-point amplitudes. Introduced in 2308.00035, this method is distinct from those based on the (functional) effective action and on (off- or on-shell) amplitudes. It takes cut amplitudes as input. In particular, one-loop...
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JAVIER LÓPEZ MIRAS03/06/2025, 09:50
The calculation of the Wilson coefficients of an effective field theory (EFT) for specific new physics models is usually performed by matching off-shell one-light-particle irreducible Green functions, which requires an off-shell basis of effective operators. We introduce "mosca", a Mathematica package designed to perform the much less standarized macthing on-shell. This matching procedure...
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Pablo Olgoso03/06/2025, 10:10
Effective field theories (EFTs) offer an efficient framework for the search
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of heavy physics beyond the Standard Model, using the so-called bottom-up and top-down approaches. However, the vastness of possible UV scenarios makes the connection
between the two approaches challenging in practice, especially at loop-level. UV/IR dictionaries fill precisely this gap, readily connecting the EFT... -
Javier Virto (Universitat de Barcelona)03/06/2025, 11:00
I will discuss a few issues related to anomalous dimensions of the EFT below the EW scale at two loop order.
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Peter Stoffer03/06/2025, 11:30
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Marko Pesut (University of Zürich)03/06/2025, 12:00
In Effective Field Theories, evanescent operators are introduced to compensate for the breakdown of four-dimensional Dirac identities (e.g. Fierz Identities) when used in combination with dimensional regularization.
In this talk, we provide an alternative approach where contributions of evanescent operators are viewed as corrections to d=4 Dirac relations. This new perspective not only...
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Mr ADRIÁN Moreno Sánchez (Universidad de Granada)03/06/2025, 12:20
The 't Hooft-Veltman scheme is the only consistent prescription for handling γ5γ5 at all orders in the perturbative expansion, which is crucial for multi-loop computations. However, its application within EFT frameworks has been limited due to technical challenges.
In this talk, we will explore a practical approach to implementing this regularization scheme using functional methods. This...
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Rodrigo Alonso (UC San Diego)03/06/2025, 14:00
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Susobhan Chattopadhyay (Tata Institute of Fundamental Research (TIFR), Mumbai)03/06/2025, 14:30
We present the complete set of positivity bounds on the Higgs Effective Field Theory (HEFT) at next-to-leading order (NLO). We identify the 15 operators that can be constrained by positivity, as they contribute to $s^2$-growth in the amplitude for longitudinal gauge-Higgs scattering, that is to all possible 2-to-2 scattering processes involving longitudinal gauge bosons, $V_L = W_L^\pm, Z_L$,...
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Xuxiang Li (University of Utah)03/06/2025, 14:50
The analogy between field redefinitions in EFTs and coordinate transformations suggests that EFT amplitudes can be interpreted as geometric invariants, constructed from fundamental building blocks. We identify these building blocks as geometric quantities derived from the covariant derivatives of the action, which remain covariant in the on-shell limit under derivative-dependent field...
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Mohammad Alminawi (University of Zurich (CH))03/06/2025, 15:10
Scalar Lagrangians can be expressed as metrics on fibre (or jet) bundles, which in turn allows for the expression of individual vertices and diagrams in terms of geometric objects. In this talk we show how this leads to explicit covariance of on-shell amplitudes under permitted field redefinitions, as well as outlining the methods for the computation of the amplitudes.
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Ilaria Brivio (University & INFN Bologna)03/06/2025, 16:00
The Standard Model and Higgs Effective Field Theories (SMEFT and HEFT) are the two well-established theoretical frameworks for the parameterization of potential new physics signals from nearly decoupled BSM sectors. They differ in the scalar field content and - most notably - in the power counting, i.e. the way they organize BSM effects into a series expansion. While it's clear that in SMEFT...
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Jay Desai (Stony Brook University)03/06/2025, 16:30
I will present the basis of dimension-eight operators associated with universal theories. Without imposing C nor P the universality assumption reduces the number of independent SMEFT operators at dimension eight from 44807 to 175. 89 of the 175 universal operators are included in the general dimension-eight operator basis in the literature. The 86 additional operators involve higher...
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Matheus Martines03/06/2025, 16:50
Under the assumption that new physics lies beyond the current energy reach of the LHC, deviations from Standard Model predictions are expected to appear in the tails of kinematic distributions. In particular, neutral- and charged-current Drell-Yan (DY) processes are useful to study such effects, given the large amount of data collected during Run 1 and Run 2 of the LHC. However, a fully...
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Giulia Lavizzari ((INFN Milano-Bicocca))03/06/2025, 17:10
The contribution will report on recent results on global EFT fits of the CMS data, with particular focus on a dimension-6 SMEFT interpretation of the measurements performed in the electroweak sector of the Standard Model, including results built upon likelihoods constructed from reconstructed-level information and properly including all correlations among the various input channels.
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Admir Greljo (Universitaet Basel (CH))04/06/2025, 09:00
We propose a model in which the proton is rendered absolutely stable by an IR mechanism that remains robust against unknown quantum gravity effects. An anomaly-free linear combination of baryon number and lepton flavors is gauged and spontaneously broken to a residual $Z_9$ discrete gauge symmetry, enforcing a strict selection rule in the SMEFT: baryon number violation occurs only in multiples...
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Mr Arnau Bas i Beneito (Institut de Física Corpuscular (IFIC) & Universitat de València (UV))04/06/2025, 09:30
Baryon and lepton number are excellent low-energy symmetries of the Standard Model (SM) that tightly constrain the form of its extensions. In this paper we investigate the possibility that these accidental symmetries are violated in the deep UV, in such a way that one multiplet necessary for their violation lives at an intermediate energy scale M above the electroweak scale. We write down the...
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Sergio de la Cruz Alzaga (PhD Student)04/06/2025, 09:50
We study the sensitivity of COHERENT-like experiments to non-standard contributions within the so-called $\nu$WEFT framework. The latter is the most general low-energy effective field theory that includes not only the light SM fields but also additional right-handed Dirac neutrinos.
Our analysis uses the framework presented at "Consistent QFT description of non-standard neutrino...
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Elie Hammou (University of Cambridge, DAMTP)04/06/2025, 10:10
Given the known non-negligible interplay between large-x PDFs and new physics signals, what PDFs are suitable for new physics searches?
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In this talk I discuss the fine balance between the benefit of constraining PDFs with high-energy observables to reduce their uncertainties in the large-x region that is relevant for new physics searches and the risk of fitting away potential signs of new... -
Celine Catherine A Degrande04/06/2025, 11:00
Suppression of interference between the SM and the dimension-six operators is well established and complicate the extraction of constraints from the LHC data. However, it can also be seen as an opportunity to motivate shape measurements. In this presentation, I will show a few examples of resurrection by differential measurements and show how they give more stable constraints when higher order...
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Athanasios Dedes04/06/2025, 11:30
We demonstrate diagrammatically the cancellation of chiral anomalies in the Standard Model Effective Field Theory (SM EFT), achieved through by a consistent choice of loop momentum routing in triangle diagrams with dimension-6 operator insertions. By enforcing gauge invariance and Bose symmetry, we show that Goldstone boson contributions cancel anomalies arising from massive gauge boson...
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Daniel Gillies04/06/2025, 11:50
The discovery potential of the Standard Model Effective Field Theory (SMEFT) can be enhanced by including dimension-8 operators and their impact on di-boson production at the Large Hadron Collider (LHC), particularly in the high energy tails of the distributions. Although $W^+W^-$ production has a large leptonic cross section, it is subject to a tight jet-veto to suppress the otherwise...
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Ken Mimasu04/06/2025, 12:10
In the Standard Model (SM), electroweak (EW) corrections become significant at high energies, particularly at the tera-electronvolt scale and beyond, due to the presence of Sudakov logarithms. At these energy scales, the Standard Model Effective Field Theory (SMEFT) framework provides an enhanced sensitivity to potential new physics effects. This motivates the inclusion of EW corrections not...
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Aneesh Vasant Manohar (Univ. of California San Diego (US))04/06/2025, 14:00
I discuss recent progress in using geometrical methods to compute radiative corrections in quantum field theories, and give some applications to SMEFT and ChPT.
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I will also briefly discuss infinite anomalous dimensions in EFTs. -
Eleni Vryonidou (The University of Manchester (GB))04/06/2025, 15:50
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Betsy Cunnett (University of Sussex (GB))04/06/2025, 16:20
The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of the Standard Model. Many-parameter fits to precise measurements in the framework of the SM Effective Field Theory (EFT) are becoming a standard interpretation of LHC and other collider data. In this contribution an overview is given of...
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Matteo Maltoni04/06/2025, 16:40
Among the dimension-six operators in the Standard Model Effective Field Theory (SMEFT), the four-light quark (4LQ) ones introduce four-fermion contact interactions that are not present in the Standard Model (SM), featuring the (anti-) quarks that are lighter than the top one. At Leading Order (LO), they do not contribute to the main Higgs and top processes, so they are almost never included in...
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Dr Magnus Schaaf (Technical University of Munich)04/06/2025, 17:00
In the Standard Model (SM), flavour-specific effects originate from the Higgs couplings to fermions encoded in the Yukawa matrices. UV-complete extensions of the SM typically introduce additional flavour-dependent couplings, which can significantly affect precision collider and flavour observables. In this talk, we explore the flavour structure of higher-dimensional operators in the SM...
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Dimitrios Kosmopoulos05/06/2025, 09:00
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Luis Gil (Universidad de Granada)05/06/2025, 09:30
The potential observation of a gravitational wave background compatible with a first-order phase transition (FOPT) would be a striking signature of BSM physics. In order to be able to reconstruct the underlying fundamental model, however, it is crucial to increase the precision of theoretical predictions from the thermal QFT side.
The usual approach to the computation of FOPT parameters is...
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Philipp Schicho (University of Geneva)05/06/2025, 09:50
We investigate the effect of higher-dimensional marginal operators on the thermodynamics of cosmological phase transitions. Focusing on the Abelian Higgs model, we systematically match these operators, which arise at higher orders in the underlying high-temperature expansion of thermal effective field theory, and use field redefinitions to construct a complete, minimal, and gauge-invariant...
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Andrija Rasovic05/06/2025, 10:10
Its been demonstrated that "optimized partial dressing" (OPD) thermal mass resummation, which uses gap equation solutions inserted into the tadpole, efficiently tames finite temperature perturbation theory calculations of the effective thermal potential, without necessitating use of the high-temperature approximation. Even though it was shown that OPD has a similar scale dependence as 3D EFT...
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David Sutherland05/06/2025, 11:00
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Dr Alexandre Salas-Bernárdez (Universidad Complutense de Madrid)05/06/2025, 11:30
Recently, the ATLAS and CMS experiments have been accumulating increasing statistics on the production of two electroweak (EW) bosons or more, such as HH and WWZ. These multi-boson final states are essential for probing the nature of the EW symmetry-breaking sector and its potential extensions within the framework of Effective Field Theories (EFTs), both in the linear realization (SMEFT) and...
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Mr Simone Meoni (INFN, University of Bologna (IT))05/06/2025, 11:50
Axion-like particles (ALPs) are hypothetical pseudoscalar states that emerge as pseudo-Nambu-Goldstone bosons from the breaking of an approximate global $ U(1) $ symmetry. They appear in several extensions of the Standard Model, offering potential solutions to the strong CP problem, the muon $(g\!-\!2)$ anomaly, neutrino mass generation, and dark matter. While most collider-based studies focus...
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Maximilian Detering05/06/2025, 12:10
Self-organised criticality, realised through cosmological dynamics in the early universe, is an alternative paradigm for addressing the electroweak hierarchy problem. In this scenario, an unnaturally light Higgs boson is the result of dynamics driving the electroweak vacuum towards a near-critical metastable point where the Higgs mass is bounded from above by the vacuum instability scale. To...
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Xu Li (INFN)05/06/2025, 14:00
The violation of the Lam-Tung relation in the Drell-Yan process serves as a sensitive observable for probing dipole operators as well as three scalar and tensor types of four-fermion operators. Since these operators do not interfere with the SM, their leading contributions to the violation arise at order $1/\Lambda^{-4}$. In this talk, we explore different strategies for constraining these...
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Anisha . (Karlsruhe Institute of Technology)05/06/2025, 14:20
Using the framework of the Higgs Effective Field Theory (HEFT), I will discuss multi-Higgs production via gluon-gluon fusion (ggF) and weak boson fusion (WBF). For ggF-induced multi-Higgs production, I will highlight the impact of one-loop HEFT modifications on the Higgs self-couplings and study their effects on the production rates. By including these one-loop radiative corrections and going...
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Fabian Esser05/06/2025, 14:40
Neutral triple gauge couplings (NTGCs) provide important tests of the gauge sector of the SM and are searched for at the LHC via the process $pp \rightarrow ZZ \rightarrow 4l$ with two on-shell Z bosons.
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In the SMEFT, NTGCs are produced at dimension-8 and at 1-loop order, making them doubly suppressed.
A promising alternative interpretation to NTGC searches are SM extensions with vector-like... -
Clara Hernández García (Universidad de Granada)05/06/2025, 15:00
The leading direct and indirect observable effects of arbitrary extra particles of spin 1 are conveniently described by a general effective theory with Proca vector bosons that belong to certain representations of the Standard Model gauge group. Assuming a good high-energy behaviour, we further restrict the possible representations of the extra vectors and derive constraints on their couplings...
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Victor Maura Breick (King's College London)05/06/2025, 16:00
A Tera-Z factory, such as FCC-ee or CEPC, will have indirect sensitivity to heavy new physics up to the tens of TeV scale through higher-order loop contributions to precision measurements at the Z-pole. These provide complementary sensitivity to potential deviations from the Standard Model typically thought to best be constrained at leading order at higher energies above the Z-pole, leading to...
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Benjamin Smith05/06/2025, 16:20
The electron Yukawa coupling is among the smallest parameters in the Standard Model, making it highly sensitive to even the most modest new physics effects. A dedicated Higgs pole run at FCC-ee offers a potential avenue to directly measure this coupling, though with considerable experimental challenges. In this talk, I will explore the indirect phenomenological implications of modified lepton...
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Graeme Crawford05/06/2025, 16:40
The nature of electroweak symmetry breaking remains one of the last theoretical unknowns of the Standard Model. New physics which significantly alters EWSB from the SM prediction must be non-decoupling and does not admit a SMEFT expansion. In arXiv:2409.18177, we extend the SM with a spanning set of scalar electroweak multiplets that gain the majority of their mass via the Higgs mechanism....
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Clara Lavinia Del Pio (Brookhaven National Lab)05/06/2025, 17:00
The absolute machine luminosity is a crucial parameter for high-precision measurements at future colliders. Its determination relies on the precise prediction of the cross section of some reference process, which is calculated within the Standard Model (SM). It is therefore crucial to have under control the uncertainties induced by possible New Physics (NP) effects on this reference process....
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Suraj Prakash (IFIC (UV-CSIC))06/06/2025, 09:00
In recent years, significant progress has been made in the development of automated tools that match the parameters of new physics models and the Wilson coefficients of appropriate low-energy Effective Field Theories. This talk will shed light on an extensible, hybrid tool OperatorToC++, that combines the strengths of Mathematica and C++ to facilitate the next steps beyond the matching....
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Zhe Ren (The high-energy physics group (FTAE) of the University of Granada)06/06/2025, 09:20
ABC4EFT is a mathematica package aiming to achieve the construction and conversion of operator bases in general effective field theories. The initial release of the package integrated the automatic construction of the physical bases in general Lorentz invariant effective field theories, and now we are going to make a major update to the package to integrate the conversion among different...
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Michal Ryczkowski (Università di Padova and INFN, Sezione di Padova)06/06/2025, 09:40
With the measurement of double Higgs production within reach, it is justified to expand our interest to more exotic processes, such as three Higgs boson production. This rare process is crucial for advancing our understanding of the Higgs boson, its interactions (including self-coupling), the Higgs potential, and the mechanism of electroweak symmetry breaking (EWSB). This talk explores the...
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Prof. Teng Ma (ICTP-AP, University of Chinese Academy of Sciences)06/06/2025, 10:00
We analyze causality and unitarity constraints
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in graviton scattering amplitudes, aiming to establish new bounds on theories with $U(1)$-gravitational anomalies, such as axion models
or strongly-coupled gauge theories. For this purpose, we show the necessity of coupling these theories to gravity. We obtain a universal scale $\Lambda_{\rm caus}$ at which states with $J\geq 4$ must... -
Pablo Quilez Lasanta (Universidy of California San Diego (UCSD))06/06/2025, 11:00
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Mr shakeel ur rahaman06/06/2025, 11:30
Identifying a full basis of operators to a given order is key to the generality of Effective Field Theory (EFT) and is by now a problem of known solution in terms of the Hilbert series. In this talk my primary concerned would be the hidden symmetry in general and Higgs EFT in particular. I will try to make connection between some recent counting formulae in the CCWZ formualtion with the linear...
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Luigi Carlo Bresciani (University & INFN Padova)06/06/2025, 11:50
I will present a formalism based on spinor-helicity techniques that generalizes the formulation of perturbative unitarity bounds. I will discuss unitarity bounds for $N \to M$ scattering processes (with $N,M \ge 2$), which are important for high-energy future colliders. I will also address bounds for spin-2 and higher-spin theories, which are relevant for effective field theories of gravity...
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