It has been 6 years since the first gravitational wave event GW150914. Here, I review some of the most recent and exciting gravitational wave results. I will discuss the status of the current gravitational wave detectors and their performance as a network. I will summarize the, gravitational wave detections of the past observing runs, as well as the perspectives of the future observing runs. I...
A kinetic mixing between the axion and the inflaton allows for a production of axion dark matter even if the inflationary Hubble scale is smaller than the zero-temperature axion mass. I will discuss the axion dynamics in this "inflaxion" framework, and present a cosmological scenario where the axion can drift away from its vacuum during the reheating epoch, giving rise to the observed dark...
I will review perspectives for indirect Dark Matter searches using different set of observables at small and medium scales and at low and high redshift.
I will also discuss neutrino constraints from cosmological data.
In this talk, I'll cover recent experimental highlights from ATLAS and CMS, with an emphasis on the topics related to the physics of flavor and tests of violations of fundamental symmetries.
We study perturbative unitarity constraints on generic Yukawa interactions where the involved fields have arbitrary quantum numbers under an $\prod_i SU(N_i) \otimes U(1)$ group. We derive compact expressions for the bounds on the Yukawa couplings for the cases where the fields transform under the trivial, fundamental or adjoint representation of the various $SU(N)$ factors. We apply our...
The hints of Lepton Flavor Universality violation observed in semi-leptonic B decays, often referred to as the B-physics anomalies, are among the most interesting results reported by experiments in the last years. In this talk, I will discuss possible New Physics explanations of these phenomena, which generically imply large effects also in other observables, both at low and high energy. In...
I will discuss how the framework of asymptotic safety above the Planck scale can be employed to derive specific predictions for scalar leptoquark solution to the b to s flavor anomalies. The presence of an interactive UV fixed point in the system of gauge and Yukawa couplings imposes a set of boundary conditions at the Planck scale, which allows one to determine low-energy values of the...
I will talk about the possibility to address the recent result for the muon (g-2) with an axion-like particle (ALP) at the MeV scale. This particle promptly decays to electrons, which permits to account for the XENON1T excess as in arXiv:2011.08919 and to identify the ALP with the QCD axion of arXiv:1710.03764.
In the context of the recently measured non-leptonic decays $B_{d}\to K^{*0}\bar{K}^{*0}$ and $B_{s}\to K^{*0}\bar{K}^{*0}$ we analyse the anatomy of the $L_{K^{*0}\bar{K}^{*0}}$ observable that compares the longitudinal components of both decays. This observable is cleaner than the longitudinal polarisation fraction as it is afflicted only at subleading order in a $1/m_b$ expansion by the...
With the expected amount of present and future LHC data, top-quark-related phenomena that very scarcely arise offer new ways to test the Standard Model and probe physics beyond it. In this talk, we focus on two of those phenomena: four-top production and toponium formation. In the former case, we examine effective field theory interpretations of current and expected limits, compare them with...
Starting from collider energies of a few TeV, electroweak vector boson fusion/scattering becomes the dominant production mode at lepton colliders for Standard Model and new physics processes that are relevant to studying the EW sector. We show that in this regime a muon collider would effectively act as a ``high-luminosity weak boson collider,'' offering a wide range of opportunities to...
We review the present determination of neutrino oscillation parameters within the standard 3 flavour scenario, discussing also the status of the CP (and T) violating phase. We emphasize the model-dependence of this approach. Then we show that a much more model-independent way to search for T violation is possible with future long-baseline oscillation experiments, by measuring the oscillation...
Low-scale models of neutrino mass generation often feature sterile neutrinos with masses in the GeV-TeV range, which can be produced at colliders through their mix- ing with the Standard Model neutrinos. We consider an alternative scenario in which the sterile neutrino is produced in the decay of a heavier particle, such that its production cross section does not depend on the active-sterile...
We discuss neutrino magnetic moments as a way of constraining physics beyond the Standard Model. In fact, new physics at the TeV scale can easily generate observable neutrino magnetic moments - we discuss in particular possible connections to models aiming to solve the flavor anomalies. We then highlight the multitude of ways of probing neutrino magnetic moments, in particular using direct...
We will study the capabilities of the DUNE near detector to probe deviations from unitarity of the leptonic mixing matrix, the 3+1 sterile formalism and Non-Standard Interactions affecting neutrino production and detection, clarifying the relation and possible mappings among the three formalisms. Particular attention will be paid to the analysis of the $\nu_\tau$ appearance channel and the...
The past two decades have seen a remarkable advance in our understanding in our understanding of quark transitions, and in particular the production and decay of heavy flavour hadrons. In this talk I will review the present status of heavy flavour measurements constraining the CKM matrix which governs quark transitions in the Standard Model, as well as measurements probing rare and forbidden...
Several observables in B-meson decays show discrepancies between
experimental data and Standard Model (SM) predictions. Recently, LHCb
has updated their measurement of the lepton flavor universality (LFU)
observable RK and, finding a 3.1 σ deviation from the SM, reports
evidence for violation of LFU. This talk will give an overview of the
anomalies in rare B decays and...
Form factors describing exclusive semileptonic $B_{(s)}$ decays allow e.g. to extract the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ or obtain predictions for R-ratios testing lepton flavor universality. Using the framework of lattice quantum chromodynamics, we present our results for the semileptonic $B_s \to D_s \ell \nu$, $B_s \to K \ell \nu$, and $B \to \pi \ell \nu$ decays.
First...
We revisit light-cone sum rule predictions for the full set of local B → π form factors, with focus on the systematic uncertainties that affect this method and carry out a combined fit with the precise lattice QCD results for all form factors simultaneously, in order to provide the most up-to-date exclusive determination of |Vub|. From the world average of the semileptonic B0 → π l ν decay we...
The determination of the CKM element Vcb from inclusive semileptonic
b → c semileptonic decays has reached a high precision thanks to a combination of theoretical and experimental efforts. Moreover, the long standing Vcb puzzle, a discrepancy between inclusive and exclusive determinations seems to be disappearing. In this talk, I will discuss the story of Vcb and how to continue towards even...
Recent high precision determinations of $V_{us}$ and $V_{ud}$ indicate towards anomalies in the first row of the CKM matrix. Namely, determination of $V_{ud}$ from beta decays and of $V_{us}$ from kaon decays imply a violation of first row unitarity at about $3\sigma$ level. Moreover, there is tension between determinations of $V_{us}$ obtained from leptonic $K\mu2$ and semileptonic $K\ell3$...
I will discuss the physics of the first order phase transitions in the early universe. The talk will be focused on the regime with ultra-relativistic bubble expansions. The new mechanisms for DM production and baryon asymmetry generation will be discussed
I will introduce a class of new mechanisms for low-scale baryogenesis and dark matter production that utilize the CP violation within Standard Model meson systems. Mesogenesis mechanisms operate at MeV scales and such, remarkably, are experimentally testable. I will first give an overview of B-Mesogenesis; in which baryogenesis proceeds through the oscillation and subsequent decay into a dark...
In this talk based on 1810.00880 and 2101.02706, I will present a new mechanism for Baryogenesis and Dark Matter production: B-Mesogenesis. Within the B-Mesogenesis paradigm, both the dark matter relic abundance and the baryon asymmetry of the Universe arise from the CP violating oscillations of B mesons and their subsequent decays in the early Universe. This mechanism would have distinctive...
In this talk I will describe dark sectors made of non-abelian gauge theories with fermions neutral under the Standard Model. This leads to accidentally stable Dark Matter candidates that can be populated minimally through gravitational interactions. In the pure glue scenario DM is the lightest glueball while adding light fermions the lightest pion and baryon are the DM candidates. Despite the...
I will present the most minimal realistic SU(5) unification model to date and discuss its main predictions. The particle content of the model is built entirely out of the first five non-trivial representations of the lowest dimensionality. It consequentially connects the neutrino mass generation mechanism to the experimentally observed mass disparity between the down-type quarks and charged...
Hidden valley models are motivated by open questions in particle physics, notably the electroweak hierarchy and dark matter problems. They generically lead to “dark shower” signatures at the LHC, for which the effort to understand the hidden sector phenomenology and expand the experimental coverage is underway. For this purpose I present a complete theory of dark pions, broadly motivated by...
I'll describe how to use on-shell methods to calculate EFT Wilson coefficients, for example, those important for lepton violations. These methods allow to understand when these Wilson coefficients can be zero.
Collider searches face the challenge of defining a representation of high-dimensional data such that physical symmetries are manifest, the discriminating features are retained, and the choice of representation is new-physics agnostic. We introduce JetCLR to solve the mapping from low-level data to optimized observables though self-supervised contrastive learning. As an example, we construct a...
Four-top production is one of the last benchmarks of the SM explored at the LHC, and the intersection of state of the art experimental techniques and theoretical calculations. In this talk, we give a brief review of the main problems one faces when trying to disentangle signal from background in such a complex final state with a special empashisis on the role of Monte Carlo simulations. We...
I will discuss the forward-backward asymmetry in $pp\to\ell^+\ell^-$ at the Z peak within the Standard Model Effective Field Theory (SMEFT). This observable provides per mille level constraints on the vertex corrections of the Z boson to quarks, which close a flat direction in the electroweak precision fit of the flavourful SMEFT. Moreover, we show that current LHC data are precise enough so...
Various possibilities for testing lepton dipole moments in high-energy collider experiments are investigated. A Muon Collider running at center-of-mass energies of several TeV could provide the first model-independent high-energy test of new physics in the muon g-2, being sensitive to deviations of few $\times\, 10^{-9}$, thus being able to shed light on the long-standing muon g-2 anomaly. At...
The ‘4321’ models are promising extensions of the SM that give rise to the $U_1$ vector leptoquark solution to the $B$-physics anomalies. Both the gauge and fermion sectors of these UV-constructions lead to a rich phenomenology currently accessible at high-energy colliders. In this talk we describe some of the main LHC signatures and extract exclusion limits using run-ll data. In addition, we...
Title: Light scalars from triplet Higgs fields: neutrinos, cosmology,
and colliders
Content:
SU(2) triplet Higgs fields coupling to leptons are a means to generate
Majorana masses for neutrinos. A priori the neutral scalar and
pseudoscalar components S and A could be light, as e.g. realised in
majoron models in which A is the Goldstone boson of spontaneously broken
lepton number....
Recent precise measurement of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point towards physics beyond the Standard Model. An overview of new physics solutions to AMMs and their possible experimental probes will be presented.
We shall present a brand new study of the minimal renormalizable SO(10) Higgs model focusing on its perturbativity aspects. With an essentially complete grip on the one-loop corrections to its scalar spectrum one can identify the symmetry breaking chains featuring an intermediate SU(4)xSU(2)xU(1) symmetry as a practically unique option for a potentially realistic model building.
In this talk I will review how the anomalous magnetic moment of the muon and the B anomalies can be addressed by a combined explaination, by means of loop models characterized by minimal field content. Moreover, I will show how some of these model can also provide a viable DM candidate, accounting for the measured relic density while evading direct and indirect DM constraints.
Evidence for electron-muon universality violation that has been revealed in b→sℓℓ transitions in the observables $R_{K,K^\ast}$ by the LHCb Collaboration can be explained with spin-1 leptoquarks in $SU(2)_L$ singlet $V_1$ or triplet $V_3$ representations in the $\mathcal{O}(1−10)$ TeV range. We explore the sensitivity of the high luminosity LHC (HL-LHC) and future proton-proton colliders to...
In this talk I will present the updated Standard Model prediction of
the golden rare Kaon decay modes and the CP violating parameter
epsilon_K. I will focus on the recent theoretical improvements which
result in an increased sensitivity to physics beyond the Standard
Model. I will also present a computer program that provides the
results of the relevant perturbative calculations in a wide...
After reviewing combined solutions of flavor anomalies with the singlet and triplet scalar leptoquarks $S_1$ and $S_3$, I will present possible connections to Kaon physics observables. By assuming a flavor structure for the leptoquark couplings dictated by a minimally broken $U(2)^5$, we find that bound on $Br(K^+ \to \pi^+ \nu\nu)$ from NA62 puts already some tension in the model, while the...
Flavour effects play an important role for leptogenesis in the type-I seesaw model with Majorana masses below the TeV scale. The requirement to simultaneously explain the light neutrino oscillation data and the baryon asymmetry of the universe impose constraints on the neutrino Yukawa couplings that can be probed at accelerator experiments. These predictions depend on the number of heavy...
I will start with a brief pedagogic review of the semiclassical method for determining the scaling dimensions of fixed-charge operators in conformal field theory with global symmetries and then introduce a general strategy to determine the relation between a given charge configuration and the associated operators for a given global symmetry group. I will demonstrate how, by varying the charge...
Ratios of nucleon decay rates between different channels can provide rich information about the specific GUT model realization in nature. To investigate this fingerprint in the context of SUSY GUTs and D=5 proton decay, we developed the software package SusyTCProton, which is an extension of the module SusyTC, itself to be used as a package of REAP. It takes the effective dimension 5 operators...
I shall discuss a possibility that dark matter is
a matter of parallel mirror sector which has the particle physics
identical to our particles. I discuss the possible interactions
between the ordinary and mirror particles, and in particular
baryon and lepton violating interactions and their role in
co-baryogenesis of matter and dark matter. I briefly discuss
also implications for neutron...
Charged Lepton Flavor Violation (LFV) is a very clean probe of New Physics since it is forbidden in the Standard Model (SM). The observation of neutrino oscillation implies nonzero LFV rates, which however are highly suppressed by the smallness of neutrino masses. This makes LFV an appealing target of experimental searches, as its observation would unambiguously point to New Physics.
In...
We discuss the single LQ solutions to the problem of accommodating the observed hints of LFUV in B-decays. We then focus on the combination of two scalar leptoquarks R2 and S3 and formulate the model which can describe all of the anomalies. We update the previous results with a particular emphasis on the bounds arising from the high-pT tail of pp --> tau nu. We then consider several new...
I will review our recent work on lepton flavor non-universal and anomaly-free U(1) gauge extensions of the SM. The phenomenological discussion will be centered around flavor anomalies in rare B-meson decays and muon g-2. This talk is based on 2103.13991 (AG, Stangl, and Thomsen) and 2107.07518 (AG, Soreq, Stangl, Thomsen, and Zupan).
New particles $\phi$ in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating b− and $\tau$−factories such as Belle II. A typical search topology involves pair-produced $\tau$s (or mesons), one of which decaying to visibles plus the $\phi$, and the other providing a tag. One crucial impediment of these searches is the limited ability to reconstruct the...
The increasing number of observed flavour anomalies claims for the investigation of different processes and the identification of suitable observables that can lead us to indirect discovery of NP. To this aim, I discuss a number of recent proposal of modes and observables that can discriminate SM from NP.
The NANOGrav and Parkes pulsar timing array (PTA) collaborations have recently reported strong evidence for a new stochastic process affecting the pulsar timing residuals in their respective most recent data sets, raising the hope that they have thus caught the first glimpse of a stochastic gravitational-wave background at nanohertz frequencies. In this talk, I will review the properties of...
