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Simplified models of vector leptoquarks at the TeV
Riccardo Barbieri, Claudia Cornella, Gino Isidori
Assuming confirmation of the anomalies in semi-leptonic -decays, their explanation in terms of the exchange of a massive vector leptoquark field, , of charge 2/3, appears…
A view of flavour physics in 2021
Riccardo Barbieri
Based on a view of current flavour physics and motivated by the hierarchy problem and by the pattern of quark masses and mixings, I describe a picture of flavour physics that shoul…
Flavour and Higgs compositeness: present and "near" future
Riccardo Barbieri
Flavour physics, from now up to the operation of the next high energy collider, will be an important tool for BSM searches at the TeV scale. Although far from exhaustive, a particu…
Quark masses, CKM angles and Lepton Flavour Universality violation
Riccardo Barbieri, Robert Ziegler
A properly defined and suitably broken flavour symmetry leads to successful quantitative relations between quark mass ratios and CKM angles. At the same time the intrinsic d…
B-decay anomalies in Pati-Salam SU(4)
Riccardo Barbieri, Andrea Tesi
Attempts to incorporate in a coherent picture the -decay anomalies presumably observed in and semi-leptonic decays have to face the absence of…
The paradox of the Standard Model
Riccardo Barbieri
As a way to recall and honour Guido Altarelli I contribute to the discussion on the prospect for the future of Particle Physics. I do this because I am sure that Guido would have l…
Effective Theory of Flavor for Minimal Mirror Twin Higgs
Riccardo Barbieri, Lawrence J. Hall, Keisuke Harigaya
We consider two copies of the Standard Model, interchanged by an exact parity symmetry, P. The observed fermion mass hierarchy is described by suppression factors for cha…
B-decay Anomalies in a Composite Leptoquark Model
Riccardo Barbieri, Christopher W. Murphy, Fabrizio Senia
The collection of a few anomalies in semileptonic -decays, especially in , invites to speculate about the emergence of some striking new phenomena, perhap…
Minimal Mirror Twin Higgs
Riccardo Barbieri, Lawrence J. Hall, Keisuke Harigaya
In a Mirror Twin World with a maximally symmetric Higgs sector the little hierarchy of the Standard Model can be significantly mitigated, perhaps displacing the cutoff scale above…
Searching for galactic axions through magnetized media: the QUAX proposal
R. Barbieri, C. Braggio, G. Carugno +6
We present a proposal to search for QCD axions with mass in the 200 eV range, assuming that they make a dominant component of dark matter. Due to the axion-electron spin couplin…
Higgs mass and unified gauge coupling in the NMSSM with Vector Matter
Riccardo Barbieri, Dario Buttazzo, Lawrence J. Hall +1
We consider the NMSSM extended to include one vector-like family of quarks and leptons. If (some of) these vector-like matter particles, as the Higgs doublets, have Yukawa coupling…
Anomalies in -decays and flavour symmetry
Riccardo Barbieri, Gino Isidori, Andrea Pattori +1
The collection of a few anomalies in semileptonic -decays invites to speculate about the emergence of some strikingly new phenomena. Here we offer a possible interpretation of t…
Minimal Flavor Violation and SU(5)-unification
Riccardo Barbieri, Fabrizio Senia
Minimal Flavour Violation in its strong or weak versions, based on and respectively, allows suitable extensions of the Standard Model at the TeV scale to comply w…
Electroweak Corrections
Riccardo Barbieri
The test of the electroweak corrections has played a major role in providing evidence for the gauge and the Higgs sectors of the Standard Model. At the same time the consideration…
The Composite Twin Higgs scenario
Riccardo Barbieri, Davide Greco, Riccardo Rattazzi +1
Based on an explicit model, we propose and discuss the generic features of a possible implementation of the Twin Higgs program in the context of composite Higgs models. We find tha…
Flavour physics and flavour symmetries after the first LHC phase
Riccardo Barbieri, Dario Buttazzo, Filippo Sala +1
Based on flavour symmetries only, there are two ways to give rise to an effective description of flavour physics in the quark sector close to the CKM picture: one is based on $U(3)…
Higgs couplings and electroweak observables: a comparison of precision tests
Riccardo Barbieri, Andrea Tesi
Is the weak scale natural? This ever pending question makes the search for new particle production a highly motivated primary goal of the next LHC phase. These searches may or may…
ElectroWeak theory after the first LHC phase
Riccardo Barbieri
I summarize the status of the ElectroWeak Interactions after the first phase of the Large Hadron Collider and I give an outlook on its possible developments.
One or more Higgs bosons?
Riccardo Barbieri, Dario Buttazzo, Kristjan Kannike +2
Now that one has been found, the search for signs of more scalars is a primary task of current and future experiments. In the motivated hypothesis that the extra Higgs bosons of th…
Exploring the Higgs sector of a most natural NMSSM
Riccardo Barbieri, Dario Buttazzo, Kristjan Kannike +2
The Next to Minimal Supersymmetric Standard Model (NMSSM) with a Higgs-singlet coupling λ close to unity, moderate tan β and stop masses below 1 TeV minimizes the fine tuning of th…
ICHEP2012 Physics Highlights
Riccardo Barbieri
I describe some of the highlights of ICHEP2012 with an eye to the current status of particle physics.
A 125 GeV composite Higgs boson versus flavour and electroweak precision tests
Riccardo Barbieri, Dario Buttazzo, Filippo Sala +2
A composite Higgs boson of 125 GeV mass, only mildly fine-tuned, requires top partners with a semi-perturbative coupling and a mass not greater than about a TeV. We analyze the str…
Less Minimal Flavour Violation
Riccardo Barbieri, Dario Buttazzo, Filippo Sala +1
We consider the approximate U(2)^3 flavour symmetry exhibited by the quark sector of the Standard Model and all its possible breaking terms appearing in the quark Yukawa couplings.…
Flavour physics from an approximate U(2)^3 symmetry
Riccardo Barbieri, Dario Buttazzo, Filippo Sala +1
The quark sector of the Standard Model exhibits an approximate U(2)^3 flavour symmetry. This symmetry, broken in specific directions dictated by minimality, can explain the success…