A5077283980- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Nuclear physics research studies
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- Particle Accelerators and Free-Electron Lasers
- Stellar, planetary, and galactic studies
- Physics of Superconductivity and Magnetism
- Galaxies: Formation, Evolution, Phenomena
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Spacecraft and Cryogenic Technologies
- Medical Imaging Techniques and Applications
- Scientific Research and Discoveries
- Computational Fluid Dynamics and Aerodynamics
- Radioactive Decay and Measurement Techniques
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2004-2025
Istituto Nazionale di Fisica Nucleare
2005-2025
Universitat de Barcelona
2015-2024
Institut Català de Ciències del Clima
2024
University of Messina
2022
Nankai University
2022
Karlsruhe Institute of Technology
2022
Aix-Marseille Université
2016
Roma Tre University
2004-2006
Sapienza University of Rome
1999-2005
A major goal of axion searches is to reach inside the parameter space region realistic models. Currently, boundaries this depend on somewhat arbitrary criteria, and it would be desirable specify them in terms precise phenomenological requirements. We consider hadronic models classify representations RQ new heavy quarks Q. By requiring that (i) Q's are sufficiently short lived avoid issues with long-lived strongly interacting relics, (ii) no Landau poles induced below Planck scale; 15 cases...
Nucleophobic axion models, wherein couplings to both protons and neutrons are simultaneously suppressed, can relax the stringent constraints from SN 1987A. However, it remains uncertain whether these models maintain their nucleophobic property under influence of finite baryon density effects. These especially relevant in astrophysical environments near saturation density, such as supernovae (SNe). In this study, we demonstrate that solution viable also at density. Furthermore, show bound...
The present report documents the results of Working Group 2: B, D and K decays, workshop on Flavor in Era LHC, held at CERN from November 2005 through March 2007. With advent we will be able to probe New Physics (NP) up energy scales almost one order magnitude larger than it has been possible with accelerator facilities. While direct detection new particles main avenue establish presence NP indirect searches provide precious complementary information, since most probably not measure full...
The estimation of rare $K$ decay matrix elements from ${K}_{\ensuremath{\ell}3}$ experimental data is extended beyond LO in chiral perturbation theory. Isospin-breaking effects at next-to-leading order (and partially next-to-next-to-leading order) the theory expansion, as well QED radiative corrections, are now accounted for. analysis relies mainly on cleanness two specific ratios form factors, for which theoretical control excellent. As a result, uncertainties...
In the standard model, scalar contributions to leptonic and semileptonic decays are helicity suppressed. The hypothesis of additional physical neutral/charged Higgses can enhance such give detectable effects especially in $B$ physics. For charged Higgs, experimental information on both $\mathrm{Br}(B\ensuremath{\rightarrow}D\ensuremath{\tau}\ensuremath{\nu})$ $\mathrm{Br}(B\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\nu})$ has already become available, particular,...
We discuss phenomenological criteria for defining ``axion windows,'' namely regions in the parameter space of axion-photon coupling where realistic models live. Currently, boundaries this region depend on somewhat arbitrary criteria, and it would be highly desirable to specify them terms precise requirements. first focus hadronic axion within post-inflationary scenarios, which initial abundance new vectorlike quarks $Q$ is thermal. classify their representations ${R}_{Q}$ by requiring that...
Recent measurements of b → sμ + μ − processes at LHCb and BELLE have revealed tensions the 2 3σ level between Standard Model (SM) prediction experimental results in channels B K * s ϕμ −, as well lepton-flavor universality violating observable R = Br(B Kμ −)/Br(B Ke e −). Combined global fits to available data suggest that these might their common origin New Physics (NP) beyond SM because some NP scenarios turn out be preferred over by 4 5σ. The fact all anomalies are related muons further...
We review the physics potential of a next generation search for solar axions: International Axion Observatory (IAXO) . Endowed with sensitivity to discover axion-like particles (ALPs) coupling photons as small gaγ∼ 10−12 GeV−1, or electrons gae∼10−13, IAXO has find QCD axion in 1 meV∼1 eV mass range where it solves strong CP problem, can account cold dark matter Universe and be responsible anomalous cooling observed number stellar systems. At same time, will have enough detect lower axions...
A bstract In this article we investigate in detail the possibility of accounting for b → sℓ + ℓ − anomalies via box contributions involving with new scalars and fermions. For purpose, first write down most general Lagrangian which can generate desired effects then calculate generic expressions all relevant s Wilson coefficients. Here extend previous analysis by allowing that particles also couple to right-handed Standard Model (SM) fermions as preferred recent data anomalous magnetic moment...
We argue that the interpretation in terms of solar axions recent XENON1T excess is not tenable when confronted with astrophysical observations stellar evolution. discuss reasons why emission a flux sufficiently intense to explain anomalous data would radically alter distribution certain type stars color-magnitude diagram first place and also clash number other observables. Quantitatively, significance discrepancy ranges from 3.3σ for rate period change pulsating white dwarfs exceeds 19σ R...
A bstract This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in Sun, with unprecedented sensitivity. BabyIAXO conceived test all subsystems (magnet, optics detectors) relevant scale final system thus serve as prototype IAXO, but same time fully-fledged physics reach itself, potential discovery....
In the light of recent result Muon g-2 experiment and update on test lepton flavour universality $R_K$ published by LHCb collaboration, we systematically build discuss a set models with minimal field content that can simultaneously give: (i) thermal Dark Matter candidate; (ii) large loop contributions to $b\to s\ell\ell$ processes able address other $B$ anomalies; (iii) natural solution muon $g-2$ discrepancy through chirally-enhanced contributions.
Abstract Axion production from astrophysical bodies is a topic in continuous development, because of theoretical progress the estimate stellar emission rates and, especially, improved observations. We carry out comprehensive analysis most informative astrophysics data, revisiting bounds on axion couplings to photons, nucleons and electrons, reassessing significance various hints anomalous energy losses. confront performance constructions accounting for these hints, while complying with...
The rare flavor-changing top quark decay $t\ensuremath{\rightarrow}cZ$ is a clear sign of new physics and experimentally very interesting due to the huge number quarks produced at LHC. However, there are few (viable) models which can generate sizable branching ratio for $t\ensuremath{\rightarrow}cZ$---in fact vectorlike seem be only realistic option. In this paper, we investigate all three representations (under Standard Model gauge group) ($U$, ${Q}_{1}$ ${Q}_{7}$) that without violating...
There are two tensions related to the Cabibbo angle of CKM matrix. First, determinations $V_{us}$ from $K_{\mu 2}$, $K_{\ell3}$, and $\tau$ decays disagree at $3\sigma$ level. Second, using average these results in combination with $\beta$ (including super-allowed neutron decay), a deficit first-row unitarity significance again about is found. These discrepancies, known as Angle anomaly, can principle be solved by modifications $W$ boson couplings quarks. However, due $SU(2)_L$ invariance,...
We analyse the constraints on dimension-six ΔF=1 effective operators in models respecting MFV hypothesis, both one-Higgs doublet case and two-Higgs scenario with large tanβ. The are derived mainly from b→s inclusive observables measured at B factories. implications of these bounds view improved measurements exclusive b→sℓ+ℓ− s→dνν¯ transitions discussed.
A bstract We present the first unquenched, continuum limit, lattice QCD results for matrix elements of operators describing neutral kaon oscillations in extensions Standard Model. Owing to accuracy our calculation on ∆ S = 2 weak Hamiltonian elements, we are able provide a refined Unitarity Triangle analysis improving bounds coming from model independent constraints New Physics. In nonperturbative computation use combination N f maximally twisted sea quarks and Osterwalder-Seiler valence...
We propose a class of axion models with generation-dependent Peccei-Quinn charges for the known fermions that allow one to suppress couplings nucleons and electrons. Astrophysical limits are thus relaxed, allowing masses up O(0.1) eV. The axion-photon coupling remains instead sizable, so next-generation helioscopes will be able probe this scenario. Astrophobia unavoidably implies flavor-violating experimental on processes can provide complementary probes. astrophobic viable dark matter...
We revisit and update the axion-induced pair production process in a nuclear electric field mediated by axion-electron coupling, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>a</a:mi><a:mrow><a:mo>+</a:mo><a:mmultiscripts><a:mrow><a:mi>X</a:mi></a:mrow><a:mprescripts/><a:mrow><a:mi>Z</a:mi></a:mrow><a:mrow><a:mi>A</a:mi></a:mrow></a:mmultiscripts></a:mrow><a:mrow><a:mo...
We present a study of the heavy-light spectrum and D- B-meson decay constants. The results wer e obtained in quenched approximation, by using non-perturbatively improved Clover lattice action at beta=6.2, with sample 100 configurations, on 24^3 x 64 lattice. After careful analysis th systematic errors extraction physical results, assuming quite conservative discretization errors, we find f_Ds=231 +/- 12^{+6}_{-1} MeV, f_D = 211 14^{+0}_{-12} f_Ds/f_D=1.10(2), f_Bs 204 16^{+28}_{-0} f_B 179...