I will present a summary of recent experimental results in flavour physics, with a focus on those most sensitive to possible effects of physics beyond the Standard Model.
In this talk, I will review the status of the various possible
new physics explanations of the B-meson charged current anomalies namely,
R_D and R_D*. Model-independent correlations/constraints with/from other
observables will be discussed. I will also make some general comments about
the composite Leptoquark explanations.
Recent experimental highlights from the ATLAS and CMS collaborations at the CERN Large Hadron Collider will be presented. The LHC Run 2 has just concluded, having delivered over 150 fb−1 of proton-proton collisions at 13 TeV to each experiment. These large data sets enable ATLAS and CMS to expand their already wide-range physics programs and to continue their ambitious exploration of physics...
I will describe direct and indirect searches for new physics that can be carried out at a multi-TeV e+e- collider, with specific results for the energies, up to 3 TeV center of mass energy, and luminosities foreseen for the CLIC future collider project. I will focus on the searches and interpretations that aim at the discovery of new dynamics able to address some of the fundamental issues left...
Heavy neutrinos $(N)$ are commonly hypothesized in low-scale neutrino mass models and may be accessible at experiments such as LHC, or its potential successors like the 27 TeV HE-LHC or 100 TeV VLHC. We show how collider searches for such objects employing an usual (dynamic) jet veto scheme can radically improve sensitivity to EW- and TeV-scale heavy $N$. The new scheme is applicable to...
I will discuss the crossing-symmetry relation between b→cτν¯ decay and bc¯→τν¯ scattering. At low energies, this allows one to correlate New Physics contributions to the semitauonic B decays to the B(c) lifetime. At high energies, one derives direct correlations to the mono-tau signature at the LHC (pp→τhX + MET). I will discuss the impact of these considerations in New Physics explanations...
Leptonic rare decays of neutral $B$ mesons belong to the most favourable processes for testing the flavour structure of the Standard Model, with an outstanding sensitivity to possible new (pseudo)-scalar contributions. We discuss implications of the current data, discuss the use of new observables to probe New Physics, and make a comparison with leptonic decays of charged $B$ mesons.
In this talk I discuss the calculation of b->sll' and l'->l'gamma transitions in 2HDMs (including right-handed neutrinos) and its phenomenological implications.
In this talk I will show how one can account for the observed anomalies in $b\to s\mu^+\mu^-$ via loop effects with new scalars and fermions. Allowing for couplings to left- and right-handed quarks and leptons, we calculate the contributions to $b\to s\mu^+\mu^-$, $B-\bar{B}$ mixing and the anomalous magnetic moment of the muon.
I will show how, in a specific model in which we supplement the...
In this talk we discuss the present situation of global fits after the new measurement of RK. We make special emphasis on what we learn concerning disentangling scenarios and what should be the next step. Also the importance that Lepton Flavour Universal New Physics can have in the near future is discussed.
The flavor puzzle remains one of the outstanding questions in particle physics. Several mechanisms predicting large hierarchies among the different fermion masses with anarchic parameters exist on the market. Among them, models with warped extra dimensions stand out since they also address the quadratic sensitivity of the Higgs mass. However, up to now, fermion bulk masses controlling the...
The mirror twin Higgs framework allows for a natural Higgs mass without the need for colored partners. This mechanism relies crucially on a discrete symmetry which relates each standard model field to a mirror partner. In the minimal realization, the twin Higgs scenario provides only one low-energy connection between the visible and twin sectors, the light Higgs boson. In this talk, I will...
Axion like particles (ALPs) with coupling to photons or gluon have long been postulated as extension to the Standard Model.
In this talk we explore different probes of ALPs at different energy scales up to the QCD scale.
We ALPs at photon beam experiments and at superconducting radiofrequency cavities.
We discuss the various anomalies reported in short-baseline neutrino oscillations, in particular from the LSND and MiniBooNE experiments and from reactor neutrino detectors. We critically assess explanations of these anomalies within the Standard Model and beyond. In particular, we discuss the benefits and drawbacks of models with eV-scale sterile neutrinos.
We derive general bounds on the Type-III Seesaw parameters from a global fit to flavor and electroweak precision data. We will explore and compare three Type-III seesaw realizations: a general scenario, where an arbitrary number of heavy triplets is integrated out without any further assumption, and the more constrained cases in which only 3 or 2 additional heavy states are included and the...
We study constraints on the Standard Model Effective Field Theory (SMEFT) from neutrino oscillations in short-baseline reactor experiments. We calculate the survival probability of reactors antineutrinos at the leading order in the SMEFT expansion, that is including linear effects of dimension-6 operators. It is shown that, at this order, reactor experiments alone cannot probe charged-current...
I review rare kaon decays in the LHC era: we discuss interplay with
B-anomalies and possible New Physics in direct CP violation in K → 2
pi : very rare kaon decays like K → pi nu nu are very important to
this purpose We discuss also the decays K0 → mu mu due to the LHCB
measurement
I will review the present status of the CP-violating ratio $\epsilon'/epsilon$ within the SM using first dual Dual QCD (DQCD) framework and confronting it both with Lattice QCD and Chiral Perturbation Theory. DQCD is presently the only framework which allowed to calculate
all $K\to\pi\pi$ hadronic matrix elements of BSM operators which opened the road for the general study of...
The extraction of the CKM matrix from flavour observables can be affected by physics beyond the Standard Model. I will present a general roadmap to take this into account, applied to the SMEFT. This approach allows one to perform general SMEFT analyses in a consistent fashion, independently of any assumptions about the way new physics affects the flavour observables that are used to fix the...
In this talk I will discuss how high-energy astrophysical observations can be used to search for signs of the dark matter particle interactions with the standard model. I will focus in particular on the status of the WIMP search as well as on the prospects for detection of axion-like-particles with gamma rays.
I describe a non-thermal mechanism, taking place at the end of inflation, to generate the dark matter relic abundance in the form of dark photons, whose mass can range between micro-eV to GeV. This dark matter candidate can have unusual features, possibly useful for signatures in direct and indirect detection.
Scale invariant extension of the SM with QCD-like strongly interacting hidden (dark) sector is interesting, since the dimensional transmutation and chiral symmetry breaking in the hidden sector could be the origin of electroweak symmetry breaking (EWSB), and all the masses of the SM particles as well as dark pions and dark baryons that could be good cold dark matter candidates. In this talk...
The talk consist of two parts. In the first part I present a new method for the extraction of $V_{cb}$ which is based on a reduced set of non-perturbative parameters. This will eventually allow us to extract this CKM element up to order $1/m^4$ without relying on model for non-perturbative physics. in the second part I present the calculation of the QCD corrections to the $1/m^3$ contributions...
We construct angular observables in the decay of B meson to a pseudoscalar (vector) $D^{(\ast)}$ meson. We combine these observable in order to build tests of lepton flavor universality violation,
complementary to the ratios $R(D^{(\ast)})$. We then make the predictions for these observables within the standard model and new physics scenarios.
I consider the flavour physics of the most general b->c cbar s effective hamiltonian at dimension six, comprising 20 independent contact interactions. These interactions can give sizable contributions to radiative B decay, rare semileptonic B decays (P5’, right-handed currents, etc) and B-meson lifetime observables. I will present bounds on the relevant contact interactions, which generally...
Data on $B \rightarrow D \tau \nu$ and $B \rightarrow D^* \tau \nu$ deviate from their Standard-Model expectations. I discuss how precise measurements of polarisation observables can discriminate between different new-physics interpretations. The branching fraction of $\Lambda_b \rightarrow \Lambda_c \tau \nu$ will instead serve as a model-independent cross-check of previous measurements,...
We shall review simplified Z' models as explanations for discrepancies between measurements of certain neutral current B meson decays and Standard Model predictions. We provide estimates of LHC and future collider sensitivity. Then a more complete model is introduced: The Third Family Hypercharge Model, which also explains some coarse features of the fermion mass spectrum.
We explore some aspects of models with two and three SU(2) scalar doublets that lead to mass degeneracies among some of the physical scalars. We also study the CP properties of some models in the presence of discrete symmetries.
The Z-Penguin is generated at one-loop level in the Standard Model and
its renormalisation requires cancellations between involving triple
gauge triple gauge couplings and fermion gauge couplings. In this talk
I will discuss how the renormalisation can be extended to generic
extensions of the Standard Model using models that fulfil perturbative
unitarity constraints or, equivalently, models...
The potential of pseudo Nambu-Goldstone bosons can have two or more local minima e.g. at antipodal positions in the coset space. This happens in many models of composite Higgs and of composite Dark Matter. In this talk, I will discuss some unusual cosmological features of trigonometric potentials, which can lead to domain-wall structures, to supermassive primordial black holes, to...
It was recently proposed that the electroweak hierarchy problem is absent if the generation of the Higgs potential stems exclusively from quantum effects of heavy right-handed neutrinos which can also generate active neutrino masses via the type-I seesaw mechanism. Hence, in this framework dubbed the "neutrino option", the tree-level scalar potential is assumed to vanish at high energies. Such...
The stochastic background of primordial gravitational waves (GWs) carries information on the expansion history of the Universe throughout its entire evolution. This offers the exciting possibility to probe scenarios of new physics beyond the Standard Model (BSM) as well as the thermal history of our Universe prior to Big Bang nucleosynthesis in future GW experiments. In this talk, I will...
I will discuss phase transitions at the TeV scale, in particular the
electroweak one (in extensions of the standard model). I will review
the current status of how gravitational waves are generated during the
phase transition, and show how the resulting gravitational wave signal
can be obtained from key properties of the transition. Finally, I will
discuss detection prospects at future...
The LHCb experiment has made several measurements in b->s transitions which indicate tensions with the Standard Model predictions. Assuming the source of these tensions to be new physics, we present new global fits to all Wilson coefficients which can effectively receive beyond the Standard Model contributions, including also the latest results from Moriond 2019. We also discuss the role of...
A thorough investigation of the vector leptoquark (LQ) hypothesis for a combined explanation of the B-physics anomalies is presented. This hypothesis is discussed both using an Effective Field Theory approach and in the context of a complete ultraviolet completion of the Standard Model (SM) based on the hypothesis of flavour non-universal gauge interactions (which could provide an explanation...
In this talk I would like to present a work, close to conclusion, done in collaboration with V. Gherardi, M. Nardecchia, and A. Romanino. We derive general correlations of bsμμ anomalies with other flavour and high-pT observables, under the assumption that the flavour matrix of the relevant operators is of rank-one. This condition is automatically realised in a large class of UV models,...
We present the result of the updated study of the viability of the models in which the Standard Model is extended by a single leptoquark state at a TeV scale. We show that one cannot construct a model with one such scalar leptoquark state and be compatible with many constraints arising from the low energy flavor physics data, as well as from the direct LHC searches. Instead, one can combine...
Light pseudoscalars are predicted in several scenarios of physics beyond the SM. In this talk I will discuss how these particles, also known as axion-like particles (ALPs), can be probed in flavor-physics experiments. Particular emphasis will be given to ALP production at B-factories and to their contributions to FCNC mesons decays.
I will discuss the interplay between EW and Higgs measurements at future colliders.
We discuss the measurements of the anomalous triple gauge couplings at Large Hadron Collider focusing on the contribution of the O3W and O3W~ operators. These deviations were known to be particularly hard to measure due to their suppressed interference with the SM amplitudes in the inclusive processes, leading to approximate flat directions in the space of these Wilson coefficients. We present...
Searches at the LHC have placed the naturalness paradigm under pressure. In this talk I will introduce a novel class of composite Higgs models in which the top and gauge partners responsible for cutting off the Higgs quadratic divergences form a gapped continuum. The new continuum states in this scenario cannot be described as Breit-Wigner resonances, drastically changing their LHC...
I discuss strong decays of excited charmed and beauty mesons into a light meson, exploiting the effective field theory based on heavy quark symmetries for heavy mesons, chiral symmetry for light pseudoscalars and on the hidden gauge symmetry to incorporate light vector mesons. The approach has already been successfully employed to classify several heavy-light mesons.
After a brief review of...
The fully differential $\bar B \to D^* ( D \pi, D \gamma) \ell^-{\bar \nu}_\ell$ angular distributions are considered to scrutinize the effects of the $B \to D^{(*)}$ form factor parametrizations.
The use of the angular coefficients to pin down deviations from SM is discussed, in particular concerning lepton flavour universality violation phenomena.
A possible connection between the...
We propose a viable minimal model with spontaneous CP violation in the framework of a Two Higgs Doublet Model. The model is based on a generalised Branco-Grimus-Lavoura model with a flavoured $\mathbb{Z}_2$ symmetry, under which two of the quark families are even and the third one is odd. The lagrangian respects CP invariance, but the vacuum has a CP violating phase, which is able to generate...
One of the conditions for creating a matter-dominated Universe is presence of interactions that differentiate between matter and anti-matter. Properties of such interactions can be probed at particle accelerators by studying decay patters of produced particles. On March 21, one of the CERN's experiments, the LHCb, announced observation of CP-violation in the decays of particles containing...
Neutrinoless double beta decay can significantly help to shed light on the issue of non-zero neutrino mass, as observation of this lepton number violating process would imply neutrinos are Majorana particles. However, the underlying interaction does not have to be as simple as the standard neutrino mass mechanism. The entire variety of neutrinoless double beta decay mechanisms can be...
In this talk I will discuss a model-independent framework to classify and study the plethora of neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number, together with the lowest-dimensional lepton number violating operator, which contains this particle. Demanding the generation of neutrino...
After discussing the general form of a Majorana neutrino mass matrix I will introduce a master parametrization for the Yukawa matrices in agreement with neutrino oscillation data. This parametrization extends previous results in the literature and can be used for any model that induces Majorana neutrino masses with the seesaw mechanism). The application of the master parametrization will be...
