Présidents de session
Parallel session 3: BSM phenomenology
- Benjamin Fuks
Parallel session 3: BSM phenomenology
- Pietro Slavich (LPTHE-Jussieu)
Parallel session 3: BSM phenomenology
- Michelle Frigerio
Parallel session 3: BSM phenomenology
- Keisuke Harigaya
Parallel session 3: BSM phenomenology
- Marcin Badziak
Parallel session 3: BSM phenomenology
- Aldo Deandrea
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Emanuele Gendy Abd El Sayed (DESY)30/05/2022 14:00
In the Standard Model, CP violation in the Electroweak sector is parametrized by the Jarlskog Invariant. This is the order parameter of CP-violation, in the sense that it vanishes iff CP is conserved. When higher dimensional operators are allowed, and the Standard Model Effective Field Theory is constructed, numerous new sources for CP violation can appear. However, the description of CP...
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Álvaro Díaz Carmona (Universidad de Granada)30/05/2022 14:20
We present a basis of dimension-eight Green’s functions involving Standard Model (SM) bosonic fields, consisting of 86 new operators. Rather than using algebraic identities and integration by parts, we prove the independence of these interactions in momentum space, including a discussion on evanescent bosonic operators.
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Our results pave the way for renormalising the SM effective field theory... -
Renato Fonseca (University of Granada)30/05/2022 14:40
Effective field theories (EFTs) are a powerful tool for the exploration
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of potential new physics in a model-independent way. At a time when
there is a lack of clarity on how to extend the Standard Model, the
Standard Model effective field theory (SMEFT) and related EFTs have been
receiving an increasing amount of attention. For example, the number of
SMEFT operators, up to high mass... -
Pedro Bittar (University of São Paulo)30/05/2022 15:00
The unaddressed origin of Electroweak Symmetry Breaking (EWSB) in the Standard Model (SM) motivates a closer inspection of the Higgs EW couplings. In models such as the composite Higgs, the Higgs couplings are generated by the interactions with a new heavier sector that triggers EWSB. These couplings of the Higgs have an associated momentum dependence that can be parameterized by form factors....
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Ivo de Medeiros Varzielas (CFTP, Instituto Superior Tecnico)30/05/2022 15:20
We develop methods to study the scalar sector of multi-Higgs models with large discrete symmetry groups that are softly broken. While in the exact symmetry limit, the model has very few parameters and can be studied analytically, proliferation of quadratic couplings in the most general softly broken case makes the analysis cumbersome. We identify two sets of soft breaking terms which play...
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Keiichi Watanabe (The University of Tokyo, ICRR)30/05/2022 16:10
It is remarkable that the matter fields in the Standard Model (SM)
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are apparently unified into the SU(5) representations.
A straightforward explanation of this fact is to embed all the SM gauge group into a simple group containing SU(5).
Recently, however, a new framework ``fake GUT" has been proposed.
In this new framework,
the apparent matter unification can be explained by a chiral... -
Andreas Bally (Max Planck Institute for Nuclear Physics)30/05/2022 16:30
In this proposed talk, we present a gauge-Higgs grand unification setup that employs 5D warped space with a SU(6) bulk gauge field that includes both a SU(5) grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the gauge symmetry on the boundaries of the extra dimension the issue of light exotic new...
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Michele Frigerio (Laboratoire Charles Coulomb, CNRS)30/05/2022 16:50
A strongly-coupled gauge theory with a large number of colours can be conveniently studied using holography. We focus on composite fermionic operators in the limit of a large number of flavours, suitable to realise partial compositeness of the Standard Model fermions. We compute the fermion mass spectrum holographically, and identify regions in parameter space where a composite fermion can...
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Aldo Deandrea (IP2I - Université Lyon 1)30/05/2022 17:10
We discuss a new paradigm, where gauge couplings do not need to be equal at any give scale, instead they run towards the same fixed point in the deep ultraviolet. We provide a concrete example based on SU(5) with one compact extra space dimension. By construction, fermions are embedded in different SU(5) bulk fields, hence baryon number is conserved and proton decay is forbidden. The lightest...
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30/05/2022 17:30
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Radovan Dermisek (Indiana University)01/06/2022 14:00
Among the simplest new physics explanations of the muon g-2 anomaly are scenarios with chirally enhanced contributions. The new particles can be very heavy, even beyond the reach of future colliders, and thus the confirmation of such explanations might rely only on indirect evidence. I will discuss that these models generically predict correlations with related signatures that include possible...
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Xinchou Lou01/06/2022 14:20
We present here the most recent BABAR results on searches for new particles with masses below the electroweak scale predicted by many extensions of the Standard Model (SM). The results are based on the full data set of about 500 fb−1 collected at the Υ(4𝑆) resonance by the BABAR detector at the PEP-II collider.
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We present, in particular, a search for a light dark-matter bound state (the... -
Giovanni Grilli di Cortona (INFN - Laboratori Nazionali di Frascati)01/06/2022 14:40
The 4.2𝜎 discrepancy between the theoretical prediction for the muon g-2 and the experimental results is accompanied by other anomalies. Determinations of the hadronic cross section from KLOE and BaBar, a crucial input for the data-driven prediction, disagree by almost 3 𝜎. Furthermore, the data-driven result disagrees with the most precise lattice determination by 2.1 𝜎. In this talk I will...
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Wenqi KE (LPTHE)01/06/2022 15:00
Explaining the muon (g-2) anomaly, reported by Fermilab in 2021, imposes constraints on various Beyond Standard Model theories. In our work with Pietro Slavich (arXiv 2109.15277), we focus on a supersymmetric extension to the SM with four Higgs doublets. We show how the interplay between a correct Higgs mass prediction - calculated in the EFT approach - and explaining the muon (g-2) anomaly...
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Maura Ramirez-Quezada (University of Tokyo)01/06/2022 15:20
The observed value of the muon magnetic dipole moment can be explained in models with weakly-interacting massive particles (WIMPs) coupled to muons. However, a considerable range of parameter space of such models will remain unexplored in future LHC experiments and dark matter (DM) direct searches. Here I will discuss the temperature observation of neutron stars (NSs) as a promising way to...
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Sophie Klett (Max-Planck-Institut für Kernphysik Heidelberg)01/06/2022 16:10
In this work we discuss that vector-like quarks in the fundamental or higher-dimensional representation of QCD generally break chiral symmetry by dynamically generated condensates. The numerical solution of the Dyson-Schwinger equation shows that this can generate considerable scales, because the vacuum expectation value of the condensate increases with the hard vector-like mass. Transferring...
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Philipp Saake (Max Planck Institut for Nuclear Physics)01/06/2022 16:30
Motivated by addressing the hierarchy problem via the conformal standard model (cSM), we present a general formalism to analyze the generation of non-trivial minima in the one-loop effective potential using a set of exact criticality equations which, in analogy to the Nambu-Jona-Lasinio model, may be understood as gap-equations. Given the intuitive nature of these equations, we are able to...
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Jeff Kost01/06/2022 16:50
Current measurements of Standard Model parameters suggest that the electroweak vacuum is metastable. This metastability has important cosmological implications because large fluctuations in the Higgs field could trigger vacuum decay in the early universe. For the false vacuum to survive, interactions which stabilize the Higgs during inflation---e.g., inflaton-Higgs interactions or non-minimal...
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Filippo Contino (University of Catania)01/06/2022 17:10
Fundamental unsolved questions urge us to find the way beyond the SM. Among them, the problems of “Naturalness” and “Hierarchy”. Several popular attempts towards the solution have been put forward, including scale invariant BSM models, where it is assumed that dimensional regularization is endowed with special physical properties. In this talk, these attempts will be carefully confronted with...
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Alejo Rossia (University of Manchester)02/06/2022 14:00
Diboson production processes constitute an interesting probe of New Physics related to the Higgs boson and the EW sector. We revisit the 𝑊ℎ and 𝑍ℎ production processes, with ℎ→𝑏𝑏¯ and leptonically decaying gauge bosons. For the first time, we include the neutrino decay channel of the Z boson and perform a scale-invariant b-tagging. We study these processes in the SMEFT framework and derive...
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Steven Paasch (DESY)02/06/2022 14:20
Using a CMS measurement of four top (𝑡𝑡¯𝑡𝑡¯) production in proton-proton collisions we constrain the parameter space of BSM scalar models. We study these effects for models with a generic scalar X with couplings to W-bosons and to top-quarks. We use Monte-Carlo simulators and fast detector simulations to recast the CMS analysis in order to obtain upper limits on the cross section times...
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Cheng Li (DESY)02/06/2022 14:40
We discuss a ∼3𝜎
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signal (local) in the light Higgs-boson search
in the diphoton decay mode at ∼ 96 GeV as reported by
CMS, together with a ∼2𝜎 excess (local)
in the 𝑏𝑏¯ final state
at LEP in the same mass range.
We interpret this possible signal as a Higgs boson in the
2~Higgs Doublet Model type~II with an additional Higgs singlet, which can be either complex (2HDMS) or real (N2HDM),... -
Rafał Masełek (University of Warsaw (PL), Institute of Theoretical Physics)02/06/2022 15:00
In recent years more attention was attracted by studies on long-lived charged particles predicted
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by some of BSM scenarios. We present a highly model independent study targeting colour-singlet
and colour-triplet particles, with electric charges up to 8 times the elementary charge. In our work,
we assess the possibility to detect such particles during Run-3 and at HL-LHC, by estimating... -
Tobias Theil (TUM)02/06/2022 15:20
The production of four tops at particle colliders is one of the most important probes of the top sector and its connection to physics beyond the SM. In particular, four-top contact interactions give rise to the largest new physics effects at high energies in the case of a strongly interacting top quark. We demonstrate the capabilities of a 100 TeV proton-proton collider to test such...
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Satoshi Shirai (Kavli IPMU)02/06/2022 16:10
One of the most promising methods to search for axions is a light-shining-through-walls (LSW) experiment. In this talk, I will discuss the possibility of performing an LSW experiment at the ILC experiment, where photon beams are generated for positron production. The photon beam is energetic and intense; the energy is of order MeV and the number of photons is about 1024 per year. Due to the...
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Salvador Centelles Chuliá (Max-Planck-Institut für Kernphysik)02/06/2022 16:30
We explore a common symmetrical origin for two long standing problems in particle physics: the strong CP and the fermion mass hierarchy problems. The Peccei-Quinn mechanism solves the former one with an anomalous global 𝑈(1)𝑃𝑄 symmetry. Here we investigate how this 𝑈(1)𝑃𝑄 could at the same time explain the fermion mass hierarchy. We work in the context of a four-Higgs-doublet model which...
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essodjolo kpatcha02/06/2022 16:50
The minimal supersymmetric extension of the standard model including three families of right-handed neutrino superfields can simultaneously solve the ν-problem by being able to reproduce the correct neutrino masses and mixing angles, and explain the higgs data. Due to the smallness of the neutrino Yukawa coupling in the model, the magnitude of the R-parity violating interactions is also very...
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Priyanka Lamba (Faculty of Physics, University of Warsaw)02/06/2022 17:10
Martinus Veltman was the first to point out the inconsistency of the experimental value for the decay rate of \pi^0\rightarrow\gamma\gammaπ
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0
→γγ and its calculation by J. Steinberger with the very successful concept of the pion as the (pseudo)Nambu-Goldstone boson of the spontaneously broken global axial symmetry of strong interactions. That inconsistency has been resolved by J. Bell and... -
Keisuke Harigaya (CERN)02/06/2022 17:30
We will introduce new cosmological dynamics of the QCD axion, where the axion field rotates in field space. Axion dark matter may be produced from the kinetic energy of the rotation and the required axion decay constant is much below the prediction of the conventional evolutions. The angular momentum of the rotation is transferred into baryon asymmetry through baryon number violating...
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Collider
In recent years more attention was attracted by studies on long-lived charged particles predicted
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by some of BSM scenarios. We present a highly model independent study targeting colour-singlet
and colour-triplet particles, with electric charges up to 8 times the elementary charge. In our work,
we assess the possibility to detect such particles during Run-3 and at HL-LHC, by estimating... -
BSM g-2
We present here the most recent BABAR results on searches for new particles with masses below the electroweak scale predicted by many extensions of the Standard Model (SM). The results are based on the full data set of about 500 $\text{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance by the BABAR detector at the PEP-II collider.
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We present, in particular, a search for a light dark-matter... -
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Flavor
The discrepancies between $b\to s\ell^+\ell^-$ data and the corresponding Standard Model predictions constitute a very intriguing hint for new physics and many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, with a mass below the B meson scale, is possible: a light $Z^{\prime}$ boson.
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I will discuss...