G. Sguazzoni
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Radiation Effects in Electronics
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Scientific Computing and Data Management
- Pulsars and Gravitational Waves Research
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2016-2025
Institute of High Energy Physics
2015-2024
University of Urbino
2024
University of Antwerp
2024
New York University Florence
2024
A. Alikhanyan National Laboratory
2022-2024
Florence (Netherlands)
2024
University of Florence
2007-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
1999-2020
Istituto Nazionale di Fisica Nucleare
2018
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
The final results of the ALEPH search for Standart Model Higgs boson at LEP, with data collected in year 2000 center-of-mass energies up to 209 GeV, are presented. changes respect preceding publication described and a complete study systematic effects is reported. findings this analysis confirm preliminary published November shortly after closing down LEP collider: significant excess events observed, consistent production 115 GeV/c2 Standard boson. searches neutral bosons od MSSM also...
Exotic hadrons made of five quarks (pentaquarks) are searched for in hadronic Z decays collected by the ALEPH detector at LEP. No significant signal is observed. At 95% C.L., upper limits set on production rates N such particles and their charge-conjugate state per decay: NΘ(1535)+⋅BR(Θ(1535)+→pKS0)<6.2×10−4,NΞ(1862)−−⋅BR(Ξ(1862)−−→Ξ−π−)<4.5×10−4,NΞ(1862)0⋅BR(Ξ(1862)0→Ξ−π+)<8.9×10−4,NΘc(3100)0⋅BR(Θc(3100)0→D*−p)<6.3×10−4,NΘc(3100)0⋅BR(Θc(3100)0→D−p)<31×10−4.
Single top production via the flavour changing neutral current reactions e+e- -> \bar{t}c, \bar{t}u is searched for within 214 pb-1 of data collected by ALEPH at centre-of-mass energies between 204 and 209 GeV. No deviation from Standard Model expectation observed upper limits on single cross sections are derived. The combination with lower yields an limit branching ratio BR(t Zc)+BR(t Zu) 14%, \gamma c)+BR(t u)= 0 mt=174 GeV/c2.
A search for events with a photon pair arising from the decay of Higgs boson produced in association fermion pair, is performed 893 pb−1 data recorded by ALEPH detector at LEP centre-of-mass energies up to 209 GeV. No excess such found over expected background. An upper limit derived on product e+e−→HZ cross section and H→γγ branching fraction as function mass. fermiophobic Standard Model excluded 95% confidence level all masses below 105.4 GeV/c2.
The production rates of the orbitally excited Ds∗∗ mesons, Ds1± and Ds2∗±, are measured with 4.1 million hadronic Z decays recorded by ALEPH detector during 1991–1995. mesons reconstructed in decay modes Ds1+→D∗+K0, Ds1+→D∗0K+ Ds2∗+→D0K+. rate is to be f(Z→Ds1±)=(0.52±0.09±0.06)%, under assumption that two considered saturate branching ratio. Ds2∗± determined fZ→Ds2∗±=0.83±0.29+0.07−0.13%, assuming fraction Ds2∗+→D0K+ 45%. Z→cc̄ Z→bb̄ separately.
The inclusive production of the omega(782) vector meson in hadronic Z decays is measured and compared to model predictions. analysis based on 4 million recorded by ALEPH detector between 1991 1995. rate for x_p = p_meson/p_beam > 0.05 omega -> pi^+ pi^- pi^0 decay mode found be 0.585 +- 0.019_stat 0.033_sys per event. Inclusive eta also same channel 0.10, obtaining 0.355 0.011_stat 0.024_sys branching ratio mu^+ mu^- investigated. A total 18.1 5.9 events are observed, from which muonic first...
The rate of gluon splitting into cc̄ pairs in hadronic Z decays is measured using the data sample collected by ALEPH from 1991 to 1995. selection based on identification leptons (electrons and muons) originating semileptonic charm decays, topological properties signal events. result derived selected gcc̄=(3.26±0.23(stat)±0.42(syst))%.
A search for the Higgsstrahlung process e+e−→HZ is carried out, covering decays of Higgs boson into any quark pair, a gluon pair or tau pair. The analysis based on 630 pb−1 data collected by ALEPH detector at LEP centre-of-mass energies from 189 to 209 GeV. 95% C.L. lower mass limit 109.1 GeV/c2 obtained cross section equal that expected Standard Model if exclusively hadrons and/or taus, irrespective relative branching fractions.