A5101754041- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Radioactive Decay and Measurement Techniques
- Plant Water Relations and Carbon Dynamics
- Scientific Computing and Data Management
- Atomic and Subatomic Physics Research
- Bacterial Identification and Susceptibility Testing
- Geological Modeling and Analysis
- Forest ecology and management
- International Science and Diplomacy
- Antibiotics Pharmacokinetics and Efficacy
- History and advancements in chemistry
- Cryospheric studies and observations
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Antimicrobial Resistance in Staphylococcus
Sapienza University of Rome
2020-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2019-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2020-2023
Universität Hamburg
2019
European Organization for Nuclear Research
2017-2018
University of Cambridge
2014-2017
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2015
University of Southern Denmark
2011-2013
Centre for Cosmology and Particle Physics Phenomenology
2011
Scuola Internazionale Superiore di Studi Avanzati
2010
The LHCb measurement of the $\mu/e$ ratio $R_{K^*}$ indicates a deficit with respect to Standard Model prediction, supporting earlier hints lepton universality violation observed in $R_K$ ratio. We show that and ratios alone constrain chiralities states contributing these anomalies, we find deviations from at $4\sigma$ level. This conclusion is further corroborated by theoretically challenging $b\to s\mu^+\mu^-$ distributions. Theoretical interpretations terms $Z'$, lepto-quarks, loop...
The vector leptoquark representation, $U_\mu = (3,1,2/3)$, was recently identified as an exceptional single mediator model to address experimental hints on lepton flavour universality violation in semileptonic $B$-meson decays, both neutral ($b \to s \mu \mu$) and charged c \tau \nu$) current processes. Nonetheless, it is well-known that massive vectors crave ultraviolet (UV) completion. We present the first full-fledged UV complete calculable gauge which incorporates this scenario while...
A bstract We propose a mechanism that allows for sizeable flavour violation in quark-lepton currents, while suppressing changing neutral currents quark-quark and lepton-lepton sectors. The is applied to the recently proposed “4321” renormalizable model, which can accommodate current experimental anomalies B -meson decays, both charged remaining consistent with all other indirect electroweak precision measurements direct searches at high- p T . To support this claim, we present an exhaustive...
Motivated by the recent hints of lepton flavour non-universality in B-meson semi-leptonic decays, we study constraints perturbative unitarity on new physics interpretation anomalies $$b \rightarrow c \ell \bar{\nu }$$ and s \bar{\ell transitions. Within an effective field theory approach find that $$2 2$$ fermion scattering amplitudes saturate bound below 9 80 TeV, respectively for Stronger bounds, up to few are obtained when leading operators oriented direction third generation, as...
Abstract The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new particle, often referred to as X17. This hypothetical particle can explain resonant structure observed at $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 17 MeV in invariant mass electron-positron pairs, produced after excitation nuclei such $$^8\hbox {Be}$$ <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>8</mml:mn> </mml:msup>...
We classify weak-scale extensions of the Standard Model which automatically preserve its accidental and approximate symmetry structure at renormalizable level are hence invisible to low-energy indirect probes. By requiring consistency effective field theory up scales Λeff ≈ 1015 GeV after applying cosmological constraints, we arrive a finite set possibilities that analyze in detail. One most striking signatures this framework is presence new charged and/or colored states can be efficiently...
Minimal Dark Matter (MDM) is a theoretical framework highly appreciated for its minimality and yet predictivity. Of the two only viable candidates singled out in original analysis, scalar eptaplet has been found to decay too quickly be around today, while fermionic quintuplet now being probed by indirect (DM) searches. It therefore timely critically review MDM paradigm, possibly pointing generalizations of this framework. We propose explore distinct directions. One abandon assumption DM...
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. derive compact expressions for bounds couplings cases transform trivial, fundamental or adjoint representation of various $SU(N)$ factors. apply our results to specific models formulated explain anomalous measurements $(g-2)_\mu$ and charged- neutral-current decays $B$ mesons. show that, while these can generally...
We study the constraints implied by partial wave unitarity on new physics in form of spin-zero di-boson resonances at LHC. derive scale where effective description terms SM supplemented a single resonance is expected to break down depending mass and signal cross section. Likewise, we use arguments order set perturbativity bounds renormalizable UV completions description. finally discuss under which conditions scalar signals can be accommodated within weakly coupled models.
We explore the possibility that lepton family numbers and baryon number are such good symmetries of Nature because they global remnant a spontaneously broken gauge symmetry. An almost arbitrary linear combination these (together with component hypercharge) can be consistently gauged, if Standard Model (SM) fermion content is augmented by three chiral SM singlet states. Within this framework $U(1)$ extensions one generically expects flavor nonuniversality to emerge in charged leptons, way...
We report on the status of efforts to improve reinterpretation searches and measurements at LHC in terms models for new physics, context Reinterpretation Forum. detail current experimental offerings direct particles, measurements, technical implementations Open Data, provide a set recommendations further improving presentation results order better enable future. also brief description existing software frameworks recent global analyses physics that make use data.
Recent experimental results from the Atomki collaboration have reported observation of anomalous effects in Beryllium, Helium and Carbon nuclear transitions that could hint at physics beyond Standard Model. However, MEG-II experiment has recently found no significant signal Beryllium transition ${^8}\text{Be}^\star\to{^8}\text{Be}+e^+e^-$. In view this result, we critically re-examine possible theoretical interpretations anomalies observed by terms a new boson $X$ with mass around $17\;$MeV....
A bstract Recent experimental results from the Atomki collaboration have reported observation of anomalous effects in Beryllium, Helium and Carbon nuclear transitions that could hint at physics beyond Standard Model. However, MEG-II experiment has recently found no significant signal Beryllium transition 8 Be ⋆ → + e − . In view this result, we critically re-examine possible theoretical interpretations anomalies observed by terms a new boson X with mass around 17 MeV. The present work aims...
The Large Hadron Collider experiments are probing the evolution of strong coupling $\alpha_s$ up to TeV scale. We show how ratio 3- 2-jets cross sections is affected by presence new physics and argue that it can be used place a model-independent bound on particles carrying QCD color charge. current data potentially constrains such states heavier than few hundred GeVs.
A bstract While the S 3 scalar leptoquark presents a possible tree-level explanation of b → sℓℓ flavour anomalies, it suffers from two conceptual problems which are often disregarded by model-builders. Firstly, quantum numbers allow for renormalisable diquark operator that would trigger rapid proton decay unless its coupling were tuned away. Secondly, one expects to have generic couplings leptons, require tuning avoid stringent experimental bounds on lepton violation. By gauging U(1) current...
We reconsider the case of light vectors coupled to anomalous fermionic currents, focusing on interplay between ultraviolet and infrared dynamics. Taking as a general framework gauging Standard Model accidental symmetries, we show that it is possible devise an anomaly-free completion with mostly chiral heavy fermions such Wess-Zumino terms are suppressed in infrared, thus relaxing would-be strong bounds from longitudinal emission nonconserved currents. classify scenarios they will be...
Flavor violating interactions of the Higgs boson are a generic feature models with extended electroweak symmetry breaking sectors. Here, we investigate CP violation in these interactions, which can arise from interference tree-level and 1-loop diagrams. We compute asymmetry flavor decays an effective field theory only one general Type-III Two Doublet Model (2HDM). find that large (~ O(10%)) asymmetries possible 2HDM if extra bosons has mass similar to Standard Higgs. For poorly constrained...
A bstract We assume that the quark-flavor coefficients matrix of semileptonic operators addressing neutral-current B -meson anomalies has rank-one, i.e. it can be described by a single vector in space. By correlating observed to other flavor and high- p T observables, we constrain its possible directions show large region parameter space this framework will explored data from NA62, KOTO, LHCb Belle II experiments.
We study the constraints imposed by perturbative unitarity on new physics interpretation of muon $g\ensuremath{-}2$ anomaly. Within a Standard Model effective field theory approach, we find that scattering amplitudes sourced operators saturate at about 1 PeV. This corresponds to highest energy scale needs be probed in order resolve origin On other hand, simplified models (e.g., scalar-fermion Yukawa theories) which renormalizable couplings are pushed boundary perturbativity still imply...
A bstract We study perturbative unitarity constraints on generic interactions between fermion and vector fields, which are allowed to have quantum numbers under a Π i SU( N ) ⨂ U(1) group. derive compact expressions for the bounds couplings cases where fields transform trivial, fundamental or adjoint representation of various, considering both case complex arbitrary with fermionic current also vectors arising as gauge fields. apply our results some specific NP models showing that can be...
A bstract We study the phenomenological viability of chiral extensions Standard Model, with new fermions acquiring their mass through interactions a single Higgs. examine constraints from electroweak precision tests, Higgs physics and direct searches at LHC. Our analysis indicates that purely scenarios are perturbatively excluded by combination coupling measurements LHC searches. However, allowing for partial contribution vector-like masses opens up parameter space non-decoupled exotic...
In a recent paper [arXiv:2002.00459], Buttazzo et al. show how the annually modulated rate of DAMA experiments can be possibly interpreted as an artefact due to interplay between time-dependent background and method account for it. this work, we compare hypothesis against sinusoidal dark matter signal proposed by collaboration. We produce in Bayesian approach quantitative comparison much experimental observations are support each hypothesis. Our conclusions that odds time varying being...
Abstract We study the implications of observed excess in $$B^+ \rightarrow K^+ \nu \bar{\nu }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>K</mml:mi> <mml:mi>ν</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> under assumption Rank-One Flavour Violation, i.e. that New Physics couples to a single specific direction flavour space. By varying this we...