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12/06/2024, 09:00
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Sally Dawson (BNL)12/06/2024, 09:05
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Hesham El Faham (The University of Manchester)12/06/2024, 09:35
This study explores fully leptonic WZ and WW production within the SMEFT framework at NLO in QCD, focusing on both CP-even and CP-odd triple gauge coupling dimension-six operators. We investigate the off-shell production processes and contrast our findings with those derived under the narrow-width approximation. Alongside the conventional kinematical observables, we examine...
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Marion Thomas12/06/2024, 09:55
The existence of CP violation is key to address the mystery of matter-antimatter asymmetry in the Universe. As the amount of CP violation in the SM is insufficient, the search for new sources of CP violation is of high priority for the LHC programme. We study CP violation within the Standard Model Effective Field Theory, focusing on the impact of CP-odd dimension-6 operators in gluon-induced...
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Matteo Maltoni12/06/2024, 10:10
The interference between the Standard Model (SM) and higher-dimensional effective operators can change sign over the phase space, leading to cancellations between different positive and negative terms that can make these effects hard to measure. The aim of this talk is to present a method to establish the efficiencies of given observables in separating the opposite-sign contributions to the...
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Eugenia Celada12/06/2024, 10:25
The processes of triboson production in high-energy proton–proton collisions provide a unique mean to probe the quartic interactions between EW gauge bosons and to perform indirect searches for physics beyond the Standard Model. Despite their small cross-sections, the production of 𝑉𝛾𝛾, 𝑉𝑉𝛾, 𝑉𝑉𝑉 (𝑉 = 𝑊 or 𝑍) at centre-of-mass energy of 13 TeV at the LHC has recently been observed by the ATLAS...
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Ben Pecjak (IPPP Durham)12/06/2024, 11:10
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Guilherme Guedes (DESY)12/06/2024, 11:40
Higgs decays to $gg$, $\gamma\gamma$ and $\gamma Z$ are important physical processes for Higgs physics with the latter having been recently observed at ATLAS and CMS; all of these decays arise at loop-level in the SM. Under the assumption of weakly coupled, renormalizable UV scenarios, the SMEFT can also only receive matching contributions to these processes at loop-level at dimension-6....
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Jasper Roosmale Nepveu12/06/2024, 12:00
Field redefinitions are commonly used to remove redundant operators from the Lagrangian and thereby transform to a minimal operator basis. This is, for example, necessary when the theory has first been renormalized with off-shell kinematics in a larger basis. Working through an explicit example in the O(N) model, I will argue that such field redefinitions, while leaving the $S$-matrix...
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Luca Naterop (University of Zürich and PSI)12/06/2024, 12:15
Below the electroweak scale, the LEFT provides a systematic approximation of both heavy SM and BSM physics. When extending the LEFT to next-to-leading-log accuracy, a number of technical challenges arise. In this talk, I will discuss the basis construction in the 't Hooft-Veltman scheme, $\gamma_5$ and evanescent operators, the restoration of chiral symmetry, and the role of redundant...
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Marko Pesut (University of Zürich)12/06/2024, 12:30
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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Stefano Di Noi (Università di Padova and INFN, Sezione di Padova)12/06/2024, 12:45
We present a calculation of the four-top quark operator contributions to Higgs production via gluon fusion in the Standard Model Effective Field Theory. The four-top operators enter for the first time via two-loop diagrams. Due to their chiral structure they contain $\gamma_5$, so special care needs to be taken when using dimensional regularisation for the loop integrals. We use two different...
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Javier Fuentes-Martin (Universidad de Granada)12/06/2024, 14:30
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Dr Anders Eller Thomsen (University of Bern)12/06/2024, 15:00
There has been much progress in performing and understanding EFT matching at the one-loop order in the last decade; however, the methods have rarely been applied to the case of spontaneously broken gauge theories. In this talk, I reexamine the role of gauge symmetries in EFT matching. It is possible to prove the validity of the hard-region matching formula when using the background field (BF)...
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Mr shakeel ur rahaman12/06/2024, 15:20
Indirect searches for new physics require precise measurements of low-energy observables. The EFT framework suitably accommodates the new physics contributions to such observables. As we aim for higher precision, it becomes necessary to incorporate higher-dimensional operators into our analysis as well. In this context, I will discuss the matching of UV theory with low energy theory up to...
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Pablo Olgoso12/06/2024, 15:40
Effective Field Theories provide an ordering criterion to classify all the possible new physics models, depending on the size of their contributions. At any fixed order in operator dimension and loop expansion, this classification can be organized in the form of UV/IR dictionaries, giving an efficient access to which operators are generated by a certain model and which models can generate a...
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JAVIER LÓPEZ MIRAS12/06/2024, 16:00
Effective field theories (EFTs) have become an essential tool in the search of new physics beyond the Standard Model. The calculation of the Wilson coefficients of the 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. This so-called Green's basis includes some...
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Uli Haisch (MPI Munich)12/06/2024, 16:45
In the framework of the SMEFT we derive the indirect constraints on third-generation four-quark operators that arise from electroweak precision measurements as well as flavour physics. To this purpose we calculate the dominant one- and two-loop contributions to the observables in question. We find that the considered loop effects can lead to better constraints than those from fits to top-quark...
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Dr Andres Vasquez (University of Bonn)12/06/2024, 17:05
We study the effects of four-heavy-quark operators in the production of top quarks in the framework of the Standard Model Effective Field Theory (SMEFT) at the LHC. In particular, we compute for the first time the total contribution of the four-top-quark operator which enters only at the one-loop level in the top-quark pair production process. Analytical results at one-loop are presented for...
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Alfredo Stanzione12/06/2024, 17:25
In this talk I will focus on a model independent analysis of top-philic New Physics scenarios, under the assumption that only effective operators involving top quarks are generated at tree level. After an introduction on the SMEFT framework, I will illustrate the procedure we used to derive indirect constraints on Wilson Coefficients, combining a large set of observables: B and K decays, meson...
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Fabian Esser12/06/2024, 17:40
Similarly to the difference between HEFT and SMEFT, a SM extension with an Axion-like Particle (ALP) can be parametrised in terms of a linear or chiral ALP-EFT, depending on whether the Higgs field is introduced as a doublet or a singlet, respectively.
In the linear case we particularly focus on the coupling of a light ALP to top quarks.
We use high-energy LHC probes and examine both the... -
Simone Tentori (UCLouvain)12/06/2024, 17:55
Being the heaviest fermion and having a Yukawa interaction almost equal to one, the top-quark represents one of the most interesting portals to New Physics (NP). If it is light or belongs to a secluded sector, NP can be difficult to detect in colliders with traditional methods. An alternative way, at least for setting bounds, is studying the virtual corrections to SM processes. Kinematical...
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Chia-Hsien Shen (National Taiwan University)13/06/2024, 09:00
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Zhe Ren (The high-energy physics group (FTAE) of the University of Granada)13/06/2024, 09:30
The effective field theory is an important approach for systematically parameterizing new physics beyond the Standard Model. A central concern in effective field theory is constructing effective operator bases. This work focuses on studying operator bases in effective field theory. I will introduce a general method for constructing on-shell operator bases and off-shell Green's bases in...
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Chang-Yuan Yao13/06/2024, 09:50
Axions and axion-like particles (ALPs) hold promise in addressing fundamental puzzles in physics. In this talk, we use effective field theories (EFTs) to investigate the intricate interactions between ALPs and Standard Model particles across various energy scales. Employing Hilbert series techniques, we unveil the underlying structure of these interactions, distinguishing between those that...
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Sandra Kvedaraite (University of Granada)13/06/2024, 10:10
We construct an effective field theory for non-relativistic heavy dark matter of arbitrary spin based on the Little group formalism. We present the most general HDMEFT basis up to dimension seven and show that it reproduces the non-relativistic spin 1/2 case presented in the literature. We also discuss the matching onto the relativistic DM EFT.
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Luigi Carlo Bresciani (University & INFN Padova)13/06/2024, 10:30
We elaborate on the application of on-shell and unitarity-based methods for evaluating renormalization group coefficients, and generalize this framework to account for the mixing of operators with different dimensions and leading mass effects. We derive a master formula for anomalous dimensions stemming from the general structure of operator mixings, up to two-loop order, and show how the...
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Giuseppe Ventura13/06/2024, 11:15
We study the impact of RGE running and mixing of SMEFT operators on differential observables in $Hj$, $ttH$ and $HH$ production at the LHC. We focus on a subset of operators closed under the QCD-induced anomalous dimension matrix and explore the impact of employing a fixed or dynamical scale on the EFT predictions for the Higgs transverse momentum and Higgs pair invariant mass spectra. We then...
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David Sutherland13/06/2024, 11:30
Below the electroweak scale, the gauge interactions of QED and QCD are responsible for the running of the many effective operators of the LEFT (aka WET). As these gauge interactions also preserve both parity and flavour to all orders, decomposing the operators according to their parity and many flavour charges vastly simplifies their running.
Such a decomposition makes the one-loop running...
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Eetu Loisa13/06/2024, 11:50
The Froggatt-Nielsen (FN) mechanism is one of the oldest and simplest attempts at explaining the striking hierarchies observed in the fermion masses and mixings. Given that FN models give rise to the correct fermion masses and mixings by construction and that the new particles predicted by the models are typically assumed to be heavy, it is not clear if the models are experimentally...
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Adam Falkowski (LPT Orsay)13/06/2024, 12:05
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Daniel Wendler (TU Dortmund)13/06/2024, 12:35
The Standard Model Effective Field Theory serves as a widely utilized framework for exploring new physics (NP) effects in a model-independent manner.
In previous studies, Drell-Yan collider data has stood out as a promising signature due to its energy enhancement relative to Standard Model predictions.
In our investigation, we expand on this, by analyzing the "missing energy + jet"... -
Hoa Vuong (DESY)13/06/2024, 14:30
Small instantons which increase the axion mass due to an appropriate modification of QCD at a high energy scale, can also enhance the effect of CP-violating operators to shift the axion potential minimum by an amount $\theta_{\rm ind}\,$, which is severely constrained by neutron electric dipole moment experiments. In this talk, focusing on the dimension-six CP-odd operators in the Standard...
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Gabriele Levati (Università degli studi di Padova and INFN Padova)13/06/2024, 14:50
CP-violating probes are among the most promising and yet relatively unexplored ways to look for Axion-like particles (ALPs) and to investigate their phenomenology.
Starting from the most general dimension-5, $SU(3)_{\text{c}} \times U(1)_{\text{em}}$ invariant effective Lagrangian for a CP-violating ALP at the electroweak (EW) scale, we discuss two relevant phenomenological frameworks.
In... -
Ling-Xiao Xu (ICTP, Trieste)13/06/2024, 15:05
We discuss heavy particles that can be used to pin down the faithful Standard Model (SM) gauge group and their patterns in the SM effective field theory (SMEFT). These heavy particles are not invariant under a specific $\mathbb{Z}_6$ subgroup of $SU(3)_c\times SU(2)_L \times U(1)_Y$, which however acts trivially on all the SM particles, hence the faithful SM gauge group remains undetermined....
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Felix Wilsch (RWTH Aachen University)13/06/2024, 15:25
We match the Minimal Supersymmetric Standard Model (MSSM) onto its corresponding low-energy EFTs at one loop. For this purpose, we consider several scenarios: (i) matching the full MSSM onto SMEFT; (ii) integrating out only the lightest of the BSM states (such as the stops, sbottoms, gaugeinos, and Higgsinos), while neglecting the heavier states; (iii) integrating out only the heavy states,...
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Xu-Xiang Li (University of Utah)13/06/2024, 15:45
Field space geometry has been fruitful in understanding many aspects of EFT, including basis-independent criteria for distinguishing HEFT vs. SMEFT, reorganization of scattering amplitudes in covariant form, derivation of renormalization group equations and geometric soft theorem. We incorporate field space geometry in functional matching by dividing the field space into light and heavy...
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Mohammad Alminawi13/06/2024, 16:05
Geometric formulations of scalar field theories have proven valuable in studying the differences between HEFT and SMEFT at the two derivative level by representing fields as coordinates on a 4D manifold and expressing field redefinitions as coordinate transformations.
We introduce an approach to extend the geometric formulation to higher numbers of derivatives as well as incorporating the... -
Maria Jose Herrero Solans (Universidad Autonoma de Madrid and IFT/UAM)13/06/2024, 16:50
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Some selected aspects of Bosonic HEFT with implications for multiple Higgs production at colliders will be presented. These include: 1) Recent progress on renormalization of 1PI functions and practical applications for specific processes at colliders, 2) The approach of matching UV theories to HEFT by identifying their predictions for amplitudes: the 2HDM case and its non-decoupling... -
Mr Carlos Quezada Calonge (Universidad Complutense de Madrid)13/06/2024, 17:10
The absence of newly discovered states at high energies makes the use of Effective Field Theories (EFTs) the adequate tool to describe the electroweak sector. Within the available EFTs, the Higgs Effective Field Theory (HEFT) provides the most general parametrization of electroweak physics. In this context, effects of new physics can substantially modify the lowest-order couplings of HEFT and...
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Dr Anisha . (University of Glasgow)13/06/2024, 17:25
The measurements of off-shell Higgs boson contributions in massive gauge boson pair production are known to probe its electroweak interactions across different energy scales. These are often employed as an estimator of the Higgs boson width in restricted theories of beyond the Standard Model physics. In this talk, I will revisit this measurement in the context of the Higgs Effective Field...
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Duarte Fontes13/06/2024, 17:45
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Tyler Corbett (University of Vienna)13/06/2024, 18:15
I will discuss a forthcoming paper on the convergence of the SMEFT expansion in the specific case of Drell Yan. By using some top down examples I will show how realistic the use of data binned in energy to better constrain Wilson coefficients is, and when this approach fails. I will also explore when dimension-six squared terms improve the quality of (simplified) fits and when this approach...
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Prof. Veronica Sanz Gonzalez (Universities of Valencia and Sussex)14/06/2024, 09:00
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Victor Miralles (University of Manchester)14/06/2024, 09:30
We present results from a global fit of dimension-six SMEFT operators that includes electroweak, Higgs-boson, top-quark, and flavor observables. The leading-order scale dependence of the SMEFT Wilson coefficients is consistently included in the evolution from the UV scale to the electroweak scale and the low-energy scale of flavor observables. In defining the SMEFT set of active operators we...
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Elie Hammou (DAMTP, University of Cambridge)14/06/2024, 09:50
The interpretation of hadron collider, such as the LHC, data, and the assessment of possible hints of new physics, require the precise knowledge of the proton structure in terms of parton distribution functions (PDFs). In this talk, I present a systematic methodology designed to determine whether and how global PDF fits might inadvertently 'fit away' signs of new physics, described by...
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Peter Stangl (CERN)14/06/2024, 10:05
We report on a new major version of the Python package smelli - the SMEFT likelihood, which implements a flavourful global likelihood function for the Standard Model Effective Field Theory (SMEFT), the Weak Effective Theory (WET), and new physics models. No specific flavour structure is assumed and the renormalization group evolution in the SMEFT and the WET is taken...
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Alejo Nahuel Rossia (University of Manchester)14/06/2024, 10:25
The ongoing Effective Field Theory (EFT) program at the LHC and elsewhere is motivated by streamlining the connection between experimental data and UV-complete scenarios of heavy new physics beyond the Standard Model (BSM). This connection is provided by matching relations mapping the Wilson coefficients of the EFT to the couplings and masses of UV-complete models. Building upon recent work on...
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Marko Simonovic (CERN)14/06/2024, 11:15
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Mikael Chala (Universidad de Granada)14/06/2024, 11:45
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Luis Gil (Universidad de Granada)14/06/2024, 12:15
The upcoming launch of the LISA interferometer has recently strengthened the interest in exploring SM extensions where a gravitational wave-producing, strong first-order electroweak phase transition (SFOEWPT) occurs in the early universe. One of the preferred approaches to the study of thermal FOPTs is through the construction of a dimensionally reduced effective field theory (3dEFT) where the...
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Dario Buttazzo14/06/2024, 12:30
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14/06/2024, 13:00
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