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Dr Eucharia Meehan (DIAS)01/05/2024, 09:00
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Prof. Sinead Ryan (Trinity College Dublin)01/05/2024, 09:10
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Susan Gascon-Shotkin (Institut de physique des 2 infinis de Lyon/Université Claude Bernard Lyon 1 IN2P3-CNRS)01/05/2024, 09:20
This talk will present the latest results on searches for additional Higgs bosons with low mass by the ATLAS and CMS experiments at the LHC. It will include searches for the 125 GeV Higgs boson decaying to lower-mass scalars.
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Joany Manjarres (Laboratoire des 2 Infinis - Toulouse, CNRS / Univ. Paul Sabatier (FR))01/05/2024, 09:40
Experimental measurements of multiboson interactions serve as tests for the Standard Model (SM) electroweak sector and its mechanism of spontaneous symmetry breaking (EWSB). One direct avenue to probe this sector is through the study of weak boson polarizations, offering a direct insight into EWSB. As longitudinal polarization modes only exist for massive bosons, they are directly linked to...
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Prof. Jeonghyeon Song (Konkuk University)01/05/2024, 10:00
In this study, we explore the signatures of a light fermiophobic Higgs boson within the type-I two-Higgs-doublet model at the HL-LHC. Our parameter scan identifies a mass range between 1 and 10 GeV, challenging to detect due to soft decay products. We propose a discovery channel with the final state consisting of four photons, one lepton, and missing transverse momentum. However, the merger of...
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Prof. Mikhail Shaposhnikov (EPFL - Ecole Polytechnique Federale Lausanne (CH))01/05/2024, 11:00
The lattice studies provided evidence of a smooth crossover between the hadronic and quark-gluon phases at high temperatures and zero chemical potential for baryonic number. We argue that these simulations might not rule out relatively weekly first-order phase transition. This first-order QCD phase transition may lead to cosmic separation of phases, creating temporarily macroscopic domains...
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Prof. Raymond Volkas (The University of Melbourne)01/05/2024, 11:20
The first idea relates to the asymmetric dark matter mass scale. To explain the cosmological coincidence between the ordinary and dark matter mass densities, one needs a rationale for why the dark matter mass scale is of the order of the proton mass. I present an analysis of how infrared fixed points in the running of the ordinary and dark QCD coupling constants can be used to achieve this...
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Michel Tytgat01/05/2024, 11:40
In this talk, I will present a study of a scenario in which the universe was initially dominated by a hot hidden sector. By this I mean that T' >> T, with T' the temperature of the hidden sector and T that of the visible sector. As an extra rule, I will assume that dark matter belong to the hidden sector and that its abundance is set by standard thermal freeze-out. One of the key issues I will...
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Stefania De Curtis (Universita e INFN, Firenze (IT))01/05/2024, 12:00
To explore BSM scenarios from underlying strong dynamics, the key ingredients are new particles as composite states. Extended Higgs sectors with pNGB Higgses can give distinctive signatures at colliders, for example in the double-Higgs production process, and can be linked to the thermal history of the Universe for triggering a strong first order EW phase transition.
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Prof. Matthew Dolan (University of Melbourne)01/05/2024, 12:20
The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. I will describe the necessity of revisiting previous calculations to provide more accurate predictions which allow for large nuclear recoil velocities and incorporate the effects of multiple ionisation. These results are relevant for dark...
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Tesla Jeltema01/05/2024, 14:20
Models of the cosmological dark matter featuring strong non-gravitational particle-particle interactions have received significant attention, as they may help alleviate, or even explain away, tensions between the standard cold dark matter paradigm and observations, including the observed diversity of galactic rotation curves. Self-interacting dark matter (SIDM) models give a number of testable...
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Maria Martinez01/05/2024, 14:40
The annual modulation of the dark matter signal in direct detection experiments stands as one of the most promising distinctive signals for providing a positive detection. For over two decades, the DAMA/LIBRA experiment in the Gran Sasso underground laboratory has observed a modulation in its low-energy data that is compatible with that expected from Weakly Interacting Massive Particles...
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Dr Valentina De Romeri (IFIC CSIC/UV (Valencia, Spain))01/05/2024, 15:00
Solar neutrinos induce elastic neutrino-electron scattering in dark matter direct detection experiments, resulting in detectable event rates at current facilities. In this talk, I will present an analysis of recent data from the XENONnT, LUX-ZEPLIN, and PandaX-4T experiments from which we derive stringent constraints on several U(1)′ extensions of the Standard Model, accommodating new...
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Cristobal Padilla Aranda (IFAE-Barcelona (ES))01/05/2024, 15:20
The Euclid mission satellite was launched on July 1st, 2023 from Cape Canaveral, Florida, with a Space X Falcon 9 rocket . After one month journey it is set in its orbit around the Sun-Earth L2 point and has already finished its commissioning period. Euclid survey started in February 2024 and will map 15000 deg2 of the sky in the following six years observing more than 1 billion galaxies with...
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Neda Darvishi (Royal Holloway University of London)01/05/2024, 15:40
In this talk, the potential for detecting sub-GeV dark matter through the QUEST-DMC experiment will be explored. The experiment employs a novel approach, utilizing superfluid Helium-3 (He-3) alongside quantum sensors. Superfluid He-3 is highlighted as an optimal medium for sub-GeV dark matter searches, particularly effective in spin-dependent interactions. The presentation will cover the...
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Howard Haber (Santa Cruz Institute for Particle Physics (SCIPP)), Howard Haber (University of California,Santa Cruz (US))01/05/2024, 16:30
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Zoltán Péli (ELTE, Eötvös University, Hungary)01/05/2024, 16:50
We study how the recent experimental results constrain the
gauge sectors of $U(1)$ extensions of the standard model
using a novel representation of the parameter space.
We determine the bounds on the mixing angle between the massive
gauge bosons, or equivalently, the new gauge coupling as a function of
the mass $M_{Z'}$ of the new neutral gauge boson $Z'$ in the
approximate range... -
Avelino Vicente (IFIC - CSIC / U. Valencia)01/05/2024, 17:10
I discuss a grand unified theory that assigns a separate $SU(5)$ gauge group to each fermion family. The equality of the gauge couplings at the unification scale is enforced by means of a cyclic $\mathbb{Z}_3$ symmetry. Such tri-unification reconciles the idea of gauge non-universality with gauge coupling unification, opening the possibility to build consistent non-universal descriptions of...
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Gabriela Lichtenstein (UNSW)01/05/2024, 17:30
Triality models are motivated by flavour structure theories. They produce charged lepton flavour violation channels mediated by a doubly charged scalar. However, the triality charges forbid decays such as muon to electron conversions, avoiding stringent experimental bounds. We have calculated predictions of charged lepton violation in this scenario and show the complementarity between Belle II...
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Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)01/05/2024, 17:50
Building on the successes of the FASER and SND@LHC experiments, proposed programs at CERN's Forward Physics Facility (FPF) can build the world's largest dataset of neutrino deep-inelastic scattering ($\nu$DIS) in the TeV range for all neutrino flavors. These data will enable novel tests of neutrino-matter interactions but also complement ongoing short-baseline programs at FNAL as well as...
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Patrizia Azzi02/05/2024, 09:00
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Alicia Calderon Tazon (Universidad de Cantabria and CSIC (ES))02/05/2024, 09:20
Determination of the nature of dark matter is one of the most fundamental problems of particle physics and cosmology. This talk presents searches for dark matter particles associated with the production of a Higgs or a dark Higgs. The results are based on proton-proton collisions recorded at sqrt(s) = 13 TeV with the CMS detector at the Large Hadron Collider.
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Jana Schaarschmidt (University of Washington (US))02/05/2024, 09:40
ATLAS is one of the main experiments at the Large Hadron Collider, with focus on Standard Model (SM) measurements and searches for new physics at the TeV scale.
One of the most active fields currently is the search for Higgs boson pair production. Models with an extended Higgs sector predict that Higgs boson pairs are produced via the decay of new heavy scalars. Models with extra dimensions... -
Dr Djuna Croon (IPPP Durham)02/05/2024, 10:00
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Enrico Nardi (INFN - Laboratori Nazionali di Frascati (IT))02/05/2024, 11:00
A pseudo Nambu-Goldstone boson (PNGB) coupled to a confining gauge group via an anomalous term is characterised, during the confining phase transition, by a temperature dependent mass $m(T) \propto T^{-n}$ with values of $n$ not far from $n\sim 3$. We study the possibility that a hidden gauge group undergoing confinement at present time could provide a suitable time-varying mass to a dark...
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Alejandro Ibarra (Technical University of Munich)02/05/2024, 11:20
The existence of dark matter in our Universe and the existence of an asymmetry between nucleons and antinucleons are two of the most solid evidences for physics beyond the Standard Model. Many mechanisms have been proposed to explain these two phenomena. On the other hand, these mechanisms typically involve different particles and different energy scales, therefore the observed similarity...
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Prof. Belen Gavela (UAM)02/05/2024, 11:40
Novel bounds on CP-odd fermionic couplings of ALPs and of a general singlet scalar are presented and compared. In both cases, we improve present constraints by several orders of magnitude. The impact of an additional Peccei-Quinn symmetry will be discussed as well.
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Francesco D'Eramo (University of Padua)02/05/2024, 12:00
Scattering and decay processes of thermal bath particles in the early universe can dump relativistic degrees of freedom in the primordial plasma. This talk will focus on the QCD axion and it will feature recent and significant improvements in the predicted amount of axion dark radiation. First, I will present novel calculations for the production rate across the different energy scales during...
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Miguel Vanvlasselaer (VUB)02/05/2024, 12:20
Compact stellar objects like Supernovae (SN) and Neutron Stars (NS) are believed to cool by emitting axions via processes emission of neutrinos and possibly emission of axions, if they exist. In this talk, we study a previously overlooked contribution to the photo-production channel of interactions like $\gamma N \to N \nu \nu$ and $\gamma N \to Na$. This originates from the unavoidable...
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Jose Ramon Espinosa Sedano (IFT-UAM/CSIC Madrid)02/05/2024, 14:15
The Tunneling Potential formalism offers an alternative to the Euclidean bounce formalism for calculating tunneling actions. These actions govern the exponential suppression of metastable vacua decay in quantum field theory. In this talk, I will discuss how this formalism elegantly describes gravitational effects on vacuum decay, bubble-of-nothing decays, domain walls, and more.
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Dr Oliver Gould (University of Nottingham)02/05/2024, 14:35
First-order phase transitions proceed via bubble nucleation. This is true regardless of whether the transition is happening in your kettle or on a cosmological scale in the very early universe. I will give an overview of our present understanding of bubble nucleation within quantum field theory, including both long-standing theoretical questions and recent progress.
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Xander Nagels02/05/2024, 14:55
The Bodeker-Moore thermal friction is usually used to determine whether or not a bubble wall can run away. However, the friction on the wall is not necessarily a monotonous function of the wall velocity and could have a maximum before it reaches the Bodeker-Moore limit. In this talk, I compare the maximal hydrodynamic obstruction, i.e., a frictional force in local thermal equilibrium that...
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Dr Marek Lewicki (University of Warsaw)02/05/2024, 15:15
We are currently witnessing the dawn of a new era in astrophysics and cosmology, started by the first LIGO/Virgo/KAGRA observations of Gravitational Waves (GW). Very recently, also the detection of a stochastic background of GWs at very low frequencies was announced by the Pulsar Timing Array collaborations. In this talk, I will discuss how such signals are produced in cosmological phase...
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Anne-Katherine Burns (UC Irvine)02/05/2024, 15:35
In this talk I will discuss PRyMordial: a program dedicated to the computation of observables in the early universe with a focus on the cosmological era of Big Bang Nucleosynthesis (BBN). The code is the first of its kind written in python and offers fast and precise evaluation of both the BBN light-element abundances and the effective number of relativistic degrees of freedom. PRyMordial was...
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Prof. Arttu Rajantie (Imperial College (GB))02/05/2024, 16:30
The dynamics of the Higgs and other light scalar fields during inflation can have important cosmological consequences, but because of the infrared problem, they cannot be computed using perturbation theory. A powerful alternative is the stochastic Starobinsky-Yokoyama approach, which is based on the observation that on superhorizon distances the field behaves classically, with a noise term...
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Chris Dessert (Flatiron Institute/New York University)02/05/2024, 16:50
Any light species in thermal equilibrium in the early universe, such as an axion, will contribute to the effective number of relativistic species, $N_\textrm{eff}$. In the context of the Axiverse, potentially hundreds of axions exist in the spectrum of nature and can thermalize with the Standard Model bath, but Planck data constrains the number of additional scalars to nine. Do they all...
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Dr Patrick Stengel (INFN Ferrara)02/05/2024, 17:10
Light relics produced by freeze-in, while more dependent on both the specific BSM physics scenario and the reheating temperature than freeze-out, are generic for models in which the light relic couples to the SM plasma more weakly than necessary for full thermalization. In particular, rates for light relic production associated with non-renormalizable interactions typical of BSM scenarios can...
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Michael Ramsey-Musolf, Michael Ramsey-Musolf (U. Massachusetts Amherst)03/05/2024, 10:00
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Stephen Frederick King (University of Southampton)03/05/2024, 10:20
We discuss some examples of how gravitational waves from either phase transitions or cosmological relics such as cosmic strings or domain walls, may be used to probe a variety of new physics ranging from neutrino mass, grand unification, inflation or even quantum gravity. The recent Pulsar Timing Array results from experiments such as NANOgrav may be the first indication of such signals.
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Germano Nardini (University of Stavanger)03/05/2024, 10:40
The LISA mission has been adopted, with launch scheduled in 2035. This leaves us with just a decade to complete the data analysis pipelines and prepare the science interpretation of the potentially observed signals. In this talk we will briefly review the status of the mission, some possible data analysis approaches to isolate the primordial stochastic GW background (SGWB), and some potential...
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Kimmo Juhani Kainulainen (University of Jyvaskyla (FI))03/05/2024, 11:00
An integral part of the BSM physics model building is testing if the new models can provide the answer to the origin of the baryon asymmetry in the universe (BAU). This test requires solving the CP-violating out-of-equilibrium particle distributions near the expanding phase transition front. The quantum transport theory for this purpose, the semiclassical method, is well understood and...
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Prof. Paula Chadwick03/05/2024, 11:50
Gamma-ray astronomy is challenging. The fluxes are low, and gamma-rays cannot be focused, leading to relatively poor angular resolution. Yet the scientific payoffs are considerable – gamma rays allow us to probe the Universe in a new way and have the potential to provide new insights into dark matter, quantum gravity, and more. This talk aims to provide an overview of gamma-ray astronomy from...
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Prof. Aleksi Vuorinen (University of Helsinki)03/05/2024, 12:10
I will review recent progress in the model-independent constraining of the properties of neutron-star matter using ab-initio tools from theoretical particle and nuclear physics. In particular, I will discuss results from a new study employing Bayesian inference methods and taking input from both electromagnetic and gravitational-wave observations, which point to the rapid conformalization of...
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Nataliya Porayko (University of Milano Bicocca)03/05/2024, 12:30
Pulsars are rapidly rotating, highly-magnetized neutron stars which emit electromagnetic radiation in the form of highly collimated beams, mainly observed in the radio wavelength regime. Pulsars can be instrumental in solving the puzzle, which has perplexed the minds of the scientific community for almost a century – dark matter. The ultralight scalar field dark matter (also known as "fuzzy"...
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Cristina Mondino (Perimeter Institute for Theoretical Physics)03/05/2024, 12:50
Cosmic microwave background (CMB) photons can convert into axion-like particles as they cross the halo magnetic fields of non-linear structure. Resonant conversion occurs when the axion mass matches the photon plasma mass, induced by the ionized gas within halos, leading to a frequency-dependent transition probability. Therefore, axions induce a frequency-dependent anisotropic screening of the...
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Prof. Peter Gallagher03/05/2024, 13:10
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Marieke Postma03/05/2024, 14:40
In electroweak baryogenesis the observed matter-antimatter asymmetry in the Universe is created during a first order electroweak phase transition. The scenario requires
new physics at the electroweak scale, which can be tested by current and upcoming experiments. Unfortunately, theoretical pedictions for the baryon asymmetry may vary by orders of magnitude, depending on the approximation... -
Prof. Shinya KANEMURA (Osaka University)03/05/2024, 15:00
We discuss how we can explore electroweak phase transitions (EWPTs) via collider experiments and gravitational wave (GW) observations. The nature of the EWPT is important to understand the thermal history of the early Universe and to determine the scenario of baryogenesis. To obtain model independent results, we focus on an effective field theoretical approach, which is known as the nearly...
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Sven Heinemeyer (CSIC (Madrid, ES))03/05/2024, 15:20
We discuss the possibility of a First Order Electroweak Phase Transition (FOEWPT) in the early universe, as required for EW baryogenesis, in the framework of the 2HDM. One corresponding prediction, the decay $A \to Z H$ with $H \to t \bar t$ may have been observed at the LHC. We present the phenomenological consequences for the detection of gravitational waves at LISA, as well as the prospects...
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Rikard Enberg03/05/2024, 15:40
A first-order Electroweak Phase Transition (FOEWPT) could explain the observed baryon-antibaryon asymmetry of the Universe, and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition, so any hope of having a FOEWPT hinges on physics beyond the Standard...
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Jose Miguel No (IFT-UAM/CSIC)03/05/2024, 16:00
Extended scalar sectors can yield baryogenesis at the EW scale. This is generally related to their providing the needed departure from thermal equilibrium (absent in the SM) via a first-order EW phase transition. Yet, BSM sources of CP violation are also required for baryogenesis, despite being very strongly constrained experimentally by electric dipole moments (EDMs). I show that extended...
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Prof. Manfred Lindner (Max-Planck-Institut fuer Kernphysik, Heidelberg, Germany)03/05/2024, 17:30
Conformal UV completions of Standard Model extensions have interesting implications on small and bigger scale hierarchies. The talk will cover general features which will be exemplified by model realizations.
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Diego Aristizabal (Universidad Tecnica Federico Santa Maria (USM))03/05/2024, 17:50
In this talk I will review a few aspects of Coherent Elastic neutrino-Nucleus Scattering (CEvNS). In particular I will focus on measurements using neutrino beams from pion decay-in-flight, as those used at FNAL. I will show that, combined with directional detectors, these beams offer an avenue for CEvNS measurements at a different energy scale. Such measurements will provide complementary...
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Dr Mariam Tórtola03/05/2024, 18:10
Observing neutral-current coherent elastic neutrino-nucleus scattering (CEvNS) at the COHERENT experiment has opened a new window to search for new physics beyond the Standard model. In this talk, I will present the constraints on BSM neutrino physics searches obtained from a detailed statistical analysis of the COHERENT CsI and LAr data. In particular, I will focus on neutrino...
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Mariano Quiros Carcelen (The Barcelona Institute of Science and Technology (BIST) (ES))04/05/2024, 09:00
The Pulsar Timing Array signal at the nHz frequency can be described by the first order phase transition of a conformal sector with a confinement scale around the GeV. We model this effect in a 5D warped theory with an IR dark brane at the GeV scale. The dark sector, located in the dark brane, interacts only gravitationaly with the SM. A simple model of a fermionic dark matter is presented,...
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Dr Michael Spira (Paul Scherrer Institute (CH))04/05/2024, 09:20
Higgs-boson pairs are dominantly produced via gluon fusion at hadron colliders, i.e. via a loop-induced process. This process will constitute the first direct access to the trilinear Higgs self-interaction. In recent years the NLO QCD corrections involving the full top-mass dependence became available by means of numerical integrations, since analytical methods available so far are not capable...
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Milada Muhlleitner04/05/2024, 09:40
While the Standard Model (SM) cannot solve all our open questions, supersymmetry (SUSY) still remains an attractive and viable option to give answers to unsolved puzzles as e.g. the nature of Dark Matter. The Higgs sector of the next-to-minimal supersymmetric extension of the SM (NMSSM) contains two complex Higgs doublets and a singlet field, leading to a rich phenomenology. In SUSY models,...
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Dr Kamila Kowalska (National Centre for Nuclear Research)04/05/2024, 10:00
I will discuss entanglement between two final-state particles in 2 to 2 scattering, induced by the S-matrix which depends on both the momentum and flavor degrees of freedom. I will describe different ways to quantify the entanglement in such a system and the resulting constraints on the interactions' structure. An example of scalar scattering in 2HDM will be discussed.
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Prof. Gustavo Branco (U. Lisbon)04/05/2024, 10:20
In recent years, interest in vector like quaks (VLQs) has been increasing, due to their contributions to
new physics effects that can be tested in experiments at LHC and High-Lumi LHC. The existence of VLQs leads to flavour-changing neutral currents at tree level and deviations from unitarity of the CKMmatrix, introducing rich phenomenological implications. In my talk I shall address some of... -
Claudia Hagedorn (IFIC -- UV/CSIC)04/05/2024, 11:00
Flavour (and CP) symmetries can be the key to understand fermion masses and mixing. In theories beyond the Standard Model they can also be crucial in order to understand, for example, the suppression of certain flavour-violating signals and the correlation among the generated amount of baryon asymmetry of the Universe and the size of CP violation, potentially observable in neutrino...
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Prof. Apostolos Pilaftsis (University of Manchester (GB))04/05/2024, 11:20
The current LHC Higgs data suggest that the couplings of the observed
125 GeV Higgs boson must be remarkably close to the Standard Model
(SM) expectations. This implies that any Beyond-the-Standard-Model
physics due to an extended Higgs sector must lead to the so-called SM
alignment limit, where one of the Higgs bosons behaves exactly like
that of the SM. In the context of the Two Higgs... -
Per Osland (University of Bergen (NO))04/05/2024, 11:40
The Weinberg 3HDM potential may lead to spontaneous CP violation. The terms thus inducing CP violation are constrained by the measured properties of the discovered scalar at 125 GeV. In a wide range of parameter space, the potential leads to one or two light neutral states (below 125 GeV) that have a considerable admixture of CP-odd fields. The potential can accommodate a light state at 95...
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M. N. Rebelo04/05/2024, 12:00
CP violation plays a very important role in nature with implications both for Particle Physics and for Cosmology. Accounting for the observed matter–antimatter asymmetry of the Universe requires the existence of new sources of CP violation beyond the Standard Model. In models with an extended scalar sector CP violation can emerge either explicitly, i.e., at the Lagrangian level, or...
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Bohdan Grzadkowski04/05/2024, 12:20
The Two Higgs Doublet Model invariant under the gauge group SU (2) × U (1) is known to have six
additional global discrete or continuous symmetries of its scalar sector. We have discovered regions
of parameter space of the model which are basis and renormalization group invariant to all orders
of perturbation theory in the scalar and gauge sectors, but correspond to none of the... -
Dr Peter Matak (Comenius University (SK))04/05/2024, 12:40
The asymmetries in out-of-equilibrium decays or scatterings necessary for lepto/baryogenesis can only occur in sufficiently complex particle models, where irreducible phases of couplings are possible. Imaginary kinematics is required in loop diagrams. Even when these ingredients are present, the resulting asymmetry may vanish due to the $CPT$ and unitarity constraints. In this talk, we show...
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Seyda Ipek04/05/2024, 14:30
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Prof. Nausheen Shah (Wayne State University)04/05/2024, 14:50
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Marta Losada (NYUAD)04/05/2024, 15:10
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Jaana Heikkilae (CERN)04/05/2024, 15:30
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Tania Natalie Robens (Rudjer Boskovic Institute (HR))04/05/2024, 16:20
After the discovery of a particle that complies with the properties of the Standard Model Higgs particle, particle physics has entered an exciting era. Both theoretical and experimental uncertainties in principle still leave room for additional particles where the scalar sector can be augmented by additional particle content. In this talk, I focus on scenarios with singlet extensions. I will...
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Stefano Moretti (Science and Technology Facilities Council STFC (GB))04/05/2024, 16:40
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Antonio Delgado (University of Notre Dame (US))04/05/2024, 17:00
In this talk I will review several scenarios for DM that can be tested in the next generation of colliders and direct detection experiments.
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Jeff Dror (University of Florida)04/05/2024, 17:20
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Lisa Biermann (KIT)04/05/2024, 17:40
We present an update of our code BSMPT that allows for the detailed study of phase transitions between evolving minima in the one-loop daisy-resummed finite-temperature effective potential.
BSMPTv3 tracks temperature-dependent coexisting minimum phases, calculates the bounce solution for regions of coexisting minima, and determines the characteristic temperatures and parameters of found... -
Cliff Burgess (McMaster University (CA))05/05/2024, 09:00
UV Priors for Light Scalars (and how they might be screened)
The recent advent of gravitational-wave observations allows testing gravity in a strongly relativistic regime, but decoupling - which beautifully explains why low-energy measurements are largely insensitive to UV details - seems to thwart the extraction of fundamental insights about UV physics from astrophysical or cosmological...
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Stefano Profumo05/05/2024, 09:20
In the age of gravitational wave astronomy and direct black hole imaging, the possibility that some of the black holes in the universe have a primordial, rather than stellar, origin, and that they might be a non-negligible fraction of the cosmological dark matter, is quite intriguing. I will review the status of the field, describe search strategies and future prospects for detection across...
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Syksy Räsänen05/05/2024, 09:40
Primordial black holes (PBH) are an interesting dark matter candidate. In single-field models of inflation that generate them, stochastic effects are typically important. I discuss how to model stochastic effects consistently and how they can greatly enhance the PBH abundance. I also discuss the role of stochasticity in collapse of matter into PBHs.
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Sachiko Kuroyanagi (IFT UAM-CSIC)05/05/2024, 10:00
Characteristic patterns can emerge in the spectral shape of the stochastic gravitational wave (GW) background through various mechanisms. For instance, the GW background generated via second-order scalar perturbations, often discussed in the context of primordial black hole formation, exhibits a distinct spectral shape. Additionally, scalar-induced GWs excited during inflation and specific...
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Ghazal Geshnizjani05/05/2024, 11:00
Inflationary spacetimes have been argued to be past geodesically incomplete in many situations. However, whether the geodesic incompleteness implies the existence of an initial spacetime curvature singularity or whether the spacetime may be extended (potentially into another phase of the universe) is generally unknown. Both questions have important physical implications. In this talk, we take...
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Enrico Maria Sessolo, Enrico Sessolo (NCBJ, Warsaw)05/05/2024, 11:20
I will discuss the possibility of dynamically generating arbitrarily small Yukawa couplings in the framework of trans-Planckian asymptotic safety. This effective mechanism may provide an interesting alternative to other dynamical means to generate small neutrino masses, e.g., the see-saw mechanism, and can be applied to various new physics scenarios requiring feeble Yukawa interactions...
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Gianluca Calcagni05/05/2024, 11:40
We present a model of the early Universe stemming directly
from a UV-complete, nonlocal, unified theory of quantum gravity and
matter. The problems of the hot big bang are solved by virtue of the
conformal invariance enjoyed by the theory without the need to invoke
inflation. Primordial tensor and scalar spectra are naturally generated
by, respectively, quantum and thermal fluctuations.... -
Dr qiuyue liang (university of Tokyo)05/05/2024, 12:00
A successful measurement of the Stochastic Gravitational Wave Background (SGWB) in Pulsar Timing Arrays (PTAs) would open up a new window through which to test the predictions of General Relativity (GR). Astrometry on the other side also holds the potential for testing fundamental physics through the effects of the Stochastic Gravitational Wave Background (SGWB) in the ∼ 1 − 100 nHz frequency...
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Francesco Costa05/05/2024, 12:20
When the Dark Matter (DM) mass is higher than the temperature of the thermal bath, DM can produced via the freeze-in mechanism with coupling as high as $O(1)$. This leads to an observationally attractive scenario compared to the standard freeze-in couplings that are $O(10^{-10})$. In fact, it can be probed by direct detection experiments and at LHC.
We display this mechanism in the scalar...
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Maeve Madigan (Heidelberg University)05/05/2024, 14:00
The Standard Model Effective Field Theory (SMEFT) provides a powerful theoretical framework for interpreting subtle deviations from the Standard Model and searching for heavy new physics at the LHC. Accurate interpretations of LHC data, however, rely on the precise knowledge of the proton structure in terms of parton distribution functions (PDFs). I will discuss the interplay between PDFs...
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Aidin Masouminia (IPPP, Durham University)05/05/2024, 14:20
I will discuss the inaugural investigation of BSM radiation processes, framed as a generalized, process- and model-independent parton shower algorithm within Herwig7, based on direct translations of UFO constructs via Herwig's "ufo2herwig" module. Additionally, I will address some phenomenological aspects of employing BSM parton showers, particularly in the context of models with extended...
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Kateryna Radchenko Serdula (DESY)05/05/2024, 14:40
We investigate the reliability of a comparison between the experimental results and the theoretical predictions for the pair production of the 125 GeV Higgs boson at the LHC. Recent experimental results for di-Higgs production provide already sensitivity to triple Higgs couplings (THCs) in models beyond the Standard Model (BSM). In our analysis within the Two Higgs Doublet Model (2HDM) we find...
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Ken Mimasu (University of Southampton)05/05/2024, 15:00
I will discuss the first combined interpretation of multiboson production at colliders in the Standard Model Effective Field Theory framework. We find that triboson measurements contribute signifincantly towards pinning down possible new interactions. We quantify how, in addition to the precise diboson measurements from the LEP and LHC experiments, they offer complementary and competitive...
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Jonathan R. Ellis (King's College London)05/05/2024, 15:20
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Eleonora Di Valentino (Institut d'Astrophysique de Paris), Eleonora Di Valentino (University of Sheffield)
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Helena Garcia Escudero (UCI)
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