Présidents de session
Parallel session 4: Neutrinos and Flavors
- Sacha Davidson
Parallel session 4: Neutrinos and Flavors
- Sandra Robles (King's College London)
Parallel session 4: Neutrinos and Flavors
- Danny Marfatia (University of Hawaii)
Parallel session 4: Neutrinos and Flavors
- Juan Herrero Garcia (University of Valencia, IFIC)
Parallel session 4: Formal aspects
- Susha Parameswaran (Liverpool University)
Parallel session 4: Formal aspects
- Susha Parameswaran (Liverpool University)
-
Salvador Rosauro30/05/2022 14:00
We investigate if the CP violation necessary for successful electroweak baryogenesis may be sourced by the neutrino Yukawa couplings. In particular, we consider an electroweak scale Seesaw realization with sizable Yukawas where the new neutrino singlets form (pseudo)-Dirac pairs, as in the linear or inverse Seesaw variants. We find that the baryon asymmetry obtained strongly depends on how the...
Go to contribution page -
Simone Marciano (INFN - Università Roma Tre)30/05/2022 14:20
We present a simple extension of the Standard Model with three right-handed neutrinos with an additional U(1) abelian flavor symmetry, with a non standard leptonic charge 𝐿𝑒−𝐿𝜇−𝐿𝜏 for lepton doublets and arbitrary right-handed charges. We present a see-saw realization of such a scenario. The baryon asymmetry of the Universe is generated via thermal leptogenesis through CP-violating decays of...
Go to contribution page -
Rome Samanta (Marie-Curie Post Doctoral fellow)30/05/2022 14:40
I shall discuss a new spectrum of super heavy right handed neutrinos that can generate the observed Dark Matter relic and baryon asymmetry of the universe. Cosmological setting of the scenario is based on an universe filled with ultralight evaporating blackholes. I shall discuss how in this mechanism cosmic strings that come out as a consequence of dynamical generation of lepton number,...
Go to contribution page -
Bowen Fu (University of Southampton)30/05/2022 15:00
The long-existing problem of neutrino mass and mixing can be connected to cosmological phenomena, such as the leptogenesis and the existence of dark matter (DM). In the extension of the type I seesaw model with two right-handed (RH) neutrinos, the seesaw Yukawa can drive the DM production, even with the competition from gravitational effect and constraints from leptogenesis. However, the DM...
Go to contribution page -
Gonzalo Herrera (TUM, MPP)30/05/2022 15:20
Sterile neutrinos with masses below the keV scale might interact with standard model leptons via electromagnetic multipoles. While the electromagnetic interactions of active neutrinos are, either predicted to be very small, or strongly constrained by observations, the electromagnetic interactions of sterile neutrinos are orders of magnitude less constrained, and the predictions are model...
Go to contribution page -
Juan Herrero Garcia (IFIC, UV/CSIC)30/05/2022 16:10
In this talk we will discuss the possibility of communicating between the visible and dark sectors via right-handed sterile neutrinos, which generate active neutrino masses. We will focus on the case of Majorana dark matter, with its relic abundance set by thermal freeze-out through annihilations into sterile neutrinos. We consider both an effective field theory approach and some simplified...
Go to contribution page -
Gioacchino Piazza30/05/2022 16:30
Sterile neutrinos are often present as building blocks of several neutrino mass generation mechanisms. Experimental searches depend on their masses and mixings with active neutrinos, and exclusion regions in the plane (|𝑈𝛼𝑁]2,𝑀𝑁) resulting form such searches rely in most of the time on the assumption of the existence of one HNL which mixes (dominantly) with only one lepton flavour.
Go to contribution page
In the... -
Károly Seller (ELTE Eötvös Loránd University)30/05/2022 16:50
The super-weak model is a particle physics model which extends the Standard Model (SM) by a new U(1) gauge symmetry. In addition to the new mediator 𝑍′, a scalar particle 𝜒 is added to deal with the meta-stability of the SM vacuum, and right-handed neutrinos are introduced to account for the non-vanishing neutrino masses. In this talk, we investigate the cosmological implications of such an...
Go to contribution page -
Leon Manuel Garcia de la Vega (Instituto de Fisica, UNAM)30/05/2022 17:10
In this talk I will discuss the effect of Coherent Elastic neutrino Nucleus Scattering (CEvNS) observations on dark matter (DM) models mediated by a Z' boson. In these models a U(1)' gauge symmetry is introduced under which SM particles and dark sector fermions are charged. Several anomaly-free models are presented and we analyze the effect of the U(1)' interaction between quarks and lepton in...
Go to contribution page -
Catarina COSME30/05/2022 17:30
In this talk, I will discuss the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal, in the case where an early matter-dominated era took place for some period between inflation and Big Bang Nucleosynthesis. In this model, we consider a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a...
Go to contribution page -
Javier Lizana (Zurich University)01/06/2022 14:00
The recent B-meson anomalies are coherently explained at the TeV scale by 4321 gauge models with hierarchical couplings reminiscent of the Standard Model Yukawas. We show that such models arise as the low-energy limit of a complete theory of flavor, based on a warped fifth dimension where each Standard Model family is quasi-localized in a different brane. The Higgs is identified as a...
Go to contribution page -
Claudio Andrea Manzari (University of Zurich)01/06/2022 14:20
The discrepancies between 𝑏→𝑠ℓ+ℓ− 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′ boson.
Go to contribution page
I will discuss this solution together... -
Fernando Arias Aragón (LPSC)01/06/2022 14:40
In this work we discuss MFV in the context of the Inverse Seesaw. The suppression in certain entries required for this approximation is explained with an additional 𝑈(1). The Goldstone Boson generated appears as a Majoron that can at the same time be identified with the axion of the MFVA model. The model presents heavy neutrinos that can be as light as a few 𝑇𝑒𝑉 in some cases, together with...
Go to contribution page -
Marco Ardu01/06/2022 15:00
Exchanging a virtual 𝜏 between 𝜇→𝜏 and 𝜏→𝑒 flavour changing vertices results in 𝜇→𝑒. Upcoming 𝜇→𝑒 searches are expected to improve the branching ratios sensitivities
Go to contribution page
up to several orders of magnitude and will probe exceptionally small
contributions. In this talk, I will discuss the sensitivities of 𝜇→𝑒 observables to 𝜇→𝜏×𝜏→𝑒 interactions in the
context of the Standard Model Effective... -
Amitayus Banik (University of Würzburg)01/06/2022 15:20
We discuss leptogenesis in a specific scotogenic model, where the Standard Model is extended by scalar and fermionic singlets and doublets charged odd under a 𝑍2 parity. This model is phenomenologically attractive as it is designed to dynamically generate small neutrino masses, provide viable dark matter candidates and also account for the current value of the (𝑔𝜇−2) anomaly. In this talk, we...
Go to contribution page -
Michał Ryczkowski (University of Warsaw)01/06/2022 16:10
Neutrino oscillations are among the most promising sources of information on leptonic CP
Go to contribution page
violating phase, which can be obtained from the measurement of oscillation probabilities.
Matter can both suppress and enhance those probabilities and therefore affect the prospects
for successful measurement of this quantity. In my talk, I'll summarize results of a recent
study (2005.07719) in which... -
Sabya Sachi Chatterjee (IPhT Saclay)01/06/2022 16:30
European Spallation source (ESS) is a highly ambitious and promising multi-disciplinary research facility based on the World's most powerful pulsed neutrons. It will also generate the high intensity neutrino fluxes from very low to high energies suitable for the studies of both the neutrino oscillation as well as Coherent Elastic Neutrino-Nucleus Scattering (CE𝜈NS) at different baselines....
Go to contribution page -
Christos Kokorelis01/06/2022 16:50
-
Sandra ROBLES (King’s College London)01/06/2022 17:10
The Hyper-Kamiokande (HyperK) experiment, currently under construction, is expected to conduct precise measurements of the Diffuse Supernova Neutrino Background (DSNB). This requires all backgrounds to be well understood. A possible source of background that has not been considered
Go to contribution page
so far is that from sub-GeV dark matter (DM) which annihilates into neutrinos. We conduct dedicated simulations... -
Alvaro Herraez (IPhT Saclay)02/06/2022 14:00HEP-TH
The Tadpole Conjecture puts sever constraints on the stabilization of a large number of moduli by claiming that in such settings the flux contribution to the tadpole grows at least linearly with the number of stabilized fields. In this talk we present the first conceptual argument that explains this linear scaling setting and clarifies why it sets in only for a large number of stabilized...
Go to contribution page -
Carlo Branchina (LPTHE)02/06/2022 14:20
The Weak Gravity Conjecture (WGC) can be obtained in flat space-time from the condition of existence of horizons for Reissner-Nordström black holes. I plan to report on the conditions for the existence and location of horizons for some black hole solutions arising in Einstein-Maxwell dilaton theories with non-trivial dilaton potential, and comment on implications for the extension of the WGC...
Go to contribution page -
Francesco Serra (Scuola Normale Superiore, Pisa)02/06/2022 14:40
Gravitational wave detection has motivated the study of effective field theories (EFTs) that describe deviations from General Relativity in the strong-field regime. One example is given by EFTs describing a shift-symmetric scalar field coupled to the graviton, which can lead to black hole hair if specific interactions are considered.
Go to contribution page
We can constrain such interactions from the point of view... -
Giulia Isabella (IJCLab)02/06/2022 15:00
I will introduce the Eikonal approximation in gravity from the partial waves expansion, which allows us to extract quantities such as the time delay or the deflection angle from scattering amplitudes.
Go to contribution page
Positivity of the time delay defines a notion of causality in gravity usually referred to as "asymptotic causality". I will discuss how asymptotic causality is satisfied at loop level, by... -
Jeffrey Kuntz (Max-Planck-Institut für Kernphysik)02/06/2022 15:20
We perform a quantization of globally scale-invariant quadratic gravity by means of the covariant operator formalism and arrive at a fresh perspective on the ghost problem in fourth order theories of gravity. After reducing the originally fourth order theory to second order in time derivatives via the introduction of an auxiliary tensor field, we identify the full Fock space of quantum states...
Go to contribution page -
Anamaria Hell (LMU Munich)02/06/2022 16:10HEP-TH
We compare the massive Kalb-Ramond and Proca fields with a quartic self-interaction and show that the same strong coupling scale is present in both theories. In the Proca theory, the longitudinal mode enters the strongly coupled regime beyond this scale, while the two transverse modes propagate further and survive in the massless limit. In contrast, in case of the massive Kalb-Ramond field,...
Go to contribution page -
Osmin Lacombe02/06/2022 16:30HEP-TH
In this talk, I revisit the idea of self-tuning the observed cosmological constant to a vanishing value and promote it to a selection criterion of brane-world models, in which our Universe is described by a 3-brane embedded in a 5d bulk. As a concrete setup, I consider a bulk scalar field φ described by a general Lagrangian $P(X,φ)$ with $X=-(∂φ)^2/2$. By requiring that the model enforces the...
Go to contribution page -
Fabio Dogliotti (Institut de Physique des deux Infinis, UCBL)02/06/2022 16:50
We present a method to obtain a scalar potential at tree level from a pure gauge theory on nilmanifolds, a class of negatively-curved compact spaces, and discuss the spontaneous symmetry breaking mechanism induced in the residual Minkowski space after compactification at low energy. We show that the scalar potential is completely determined by the gauge symmetries and the geometry of the...
Go to contribution page -
Florian Nortier (IPhT (CEA Paris-Saclay))02/06/2022 17:10HEP PH/TH
During the last decade, superrenormalizable or UV-finite theories of pure gravity and gauge theories were proposed in the framework of weakly nonlocal quantum field theories, regardless of the number of spatial dimensions. They are inspired by the success of string theory to improve the UV-behavior of local quantum field theories. Furthermore, the nonlocal scale acts as a smooth...
Go to contribution page -
Ling-Xiao Xu (University of Padova & INFN Padova)02/06/2022 17:30HEP-TH
Gauge theories are central in describing the fundamental interactions of particles both within and beyond the Standard Model. However, our knowledge on the infrared phases (for instance the vacuum structure) is limited once the theory becomes strongly-coupled. In this talk, we will try to sketch a generic and rigorous proof of chiral symmetry breaking in the confining phase of QCD-like...
Go to contribution page -
HEP PH/TH
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.
Go to contribution page
Our results pave the way for renormalising the SM effective field theory... -
HEP-TH
Martinus Veltman was the first to point out the inconsistency of the experimental value for the decay rate of \pi^0\rightarrow\gamma\gammaπ
Go to contribution page
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... -
HEP-TH
Gravitational wave detection has motivated the study of effective field theories (EFTs) that describe deviations from General Relativity in the strong-field regime. One example is given by EFTs describing a shift-symmetric scalar field coupled to the graviton, which can lead to black hole hair if specific interactions are considered.
Go to contribution page
We can constrain such interactions from the point of view... -
HEP PH/TH
The explicit breaking of the PQ symmetry by higher dimensional operators can spoil the dynamical relaxation of the strong CP angle to its minimum of zero. One solution to this PQ "quality problem" is to introduce heavy QCD axions. While still solving the strong CP problem, such heavy axions acquire a mass from physics occurring far above the QCD scale. In this talk, I will discuss the...
Go to contribution page -
HEP-TH
We perform a quantization of globally scale-invariant quadratic gravity by means of the covariant operator formalism and arrive at a fresh perspective on the ghost problem in fourth order theories of gravity. After reducing the originally fourth order theory to second order in time derivatives via the introduction of an auxiliary tensor field, we identify the full Fock space of quantum states...
Go to contribution page -
HEP-TH
The Weak Gravity Conjecture (WGC) was proposed as a consistency condition for the low-energy description of U(1) gauge theories in quantum gravity, and can be obtained from the existence conditions of horizons for Reissner-Nordström black holes. I plan to report on the conditions for the existence of horizons for black hole solutions arising in Einstein-Maxwell dilaton theories with...
Go to contribution page -
We present a supersymmetric model where energy scales of a discrete R-symmetry breaking (Z6R) and cosmic inflation are commonly attributed to the confinement scale of a hidden Sp(2) strong dynamics. Apart from these, SUSY-breaking scale, the Higgsino mass and the right-handed neutrino masses are all shown to stem from Z6R breaking scale inferred from CMB observables. We will show that the...
Go to contribution page -
HEP PH/TH
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...
Go to contribution page -
HEP PH/TH
Grand unified theories remain an appealing proposal to reduce the number of
free parameters in the gauge-Yukawa sector of the Standard Model. However, to realise the
Standard Model at low energies, the unified symmetry group has to be partially broken by a
suitable scalar potential in just the right way.In my talk, I will discuss a systematic study of radiative
Go to contribution page
symmetry breaking to... -
HEP-TH
Warped throats have been used in countless works in the context of string theory compactifications, in particular for their ability to suppress high energy scales. The Klebanov-Strassler solution gives us an explicit description of the geometry of a warped throat which we can use to perform computations --- my focus will be on the gravitational sector of the resulting 4d EFT, with its tower of...
Go to contribution page -
HEP-TH
General Relativity (GR) exists in different formulations. They are equivalent in pure gravity but lead to distinct predictions once matter is included. After a brief overview of various versions of GR, I will highlight metric-affine gravity, which avoids any assumption about the vanishing of curvature, torsion or non-metricity. Using the example of a scalar field coupled non-minimally to GR, I...
Go to contribution page -
HEP PH/TH
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...
Go to contribution page -
HEP-TH
Black holes are considered exceptional due to their time evolution and information processing. However, these properties are generic for objects, the so-called saturons, that attain the maximal entropy permitted by unitarity. We discuss the correspondence between black holes and saturons within a renormalizable $SU(N)$ invariant theory.
The spectrum contains a tower of bubbles representing...
Go to contribution page -
HEP PH/TH
The Standard Model effective field theory (SMEFT) is one of the
Go to contribution page
preferred approaches for studying particle physics in the present
scenario. The dimension-six SMEFT operators are the most relevant ones
and have been studied in various works. The renormalization group
evolution equations of these operators are available in the literature
and facilitate examining the SMEFT on combined... -
-
Manibrata Sen (Max-Planck-Institut für Kernphysik)
-
HEP-TH
I will introduce the Eikonal approximation in gravity from the partial waves expansion, which allows us to extract quantities such as the time delay or the deflection angle from scattering amplitudes.
Go to contribution page
Positivity of the time delay defines a notion of causality in gravity usually referred to as "asymptotic causality". I will discuss how asymptotic causality is satisfied at loop level, by...