M. Rotondo
A5106323145- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- Muon and positron interactions and applications
- Advanced Data Storage Technologies
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- International Science and Diplomacy
- Geophysics and Gravity Measurements
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2016-2025
University of Oxford
2017-2024
European Organization for Nuclear Research
2014-2024
University of Edinburgh
2024
RWTH Aachen University
2024
Kurchatov Institute
2019-2023
University of Liverpool
2023
Tsinghua University
2020-2023
University of Michigan–Ann Arbor
2019-2023
Syracuse University
2019-2023
This article reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavor Averaging Group using results available through summer 2016. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, \CP~violation semileptonic decays CKM matrix elements.
This paper reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavor Averaging Group using results available through September 2018. In rare cases, significant several months later are also used. For averaging, common input parameters used in various analyses adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic...
We search for single-photon events in 53 fb−1 of e+e− collision data collected with the BABAR detector at PEP-II B-Factory. look a single high-energy photon and large missing momentum energy, consistent production spin-1 particle A′ through process e+e−→γA′; A′→invisible. Such particles, referred to as "dark photons," are motivated by theories applying U(1) gauge symmetry dark matter. find no evidence such processes set 90% confidence level upper limits on coupling strength mass range mA′≤8...
This paper reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavour Averaging Group using results available before April 2021. In rare cases, significant several months later are also used. For averaging, common input parameters used in various analyses adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic...
Two of the elements Cabibbo-Kobayashi-Maskawa quark mixing matrix, $|V_{ub}|$ and $|V_{cb}|$, are extracted from semileptonic B decays. The results factories, analysed in light most recent theoretical calculations, remain puzzling, because for both $|V_{cb}|$ exclusive inclusive determinations clear tension. Further, measurements $\tau$ channels at Belle, Babar, LHCb show discrepancies with Standard Model predictions, pointing to a possible violation lepton flavor universality. Belle II have...
An angular analysis of the decay ${\overline{B} \rightarrow D^\ast \ell^- \overline{\nu}_\ell}$, $\ell\in\{e,\mu\}$, is reported using full $e^+e^-$ collision data set collected by \babar experiment at $\Upsilon(4S)$ resonance. One $B$ meson from ${\Upsilon(4S)\to B\overline{B}}$ fully reconstructed in a hadronic mode, which constrains kinematics and provides determination neutrino momentum vector. The semileptonic described di-lepton mass squared, $q^2$, three angles. first unbinned fit to...
The Feynman, Metropolis and Teller treatment of compressed atoms is extended to the relativistic regimes. Each atomic configuration confined by a Wigner-Seitz cell characterized positive electron Fermi energy. non-relativistic assumes point-like nucleus infinite values energy can be attained. In there exists limiting configuration, reached when radius equals nucleus, with maximum value $(E_e^F)_{max}$, here expressed analytically in ultra-relativistic approximation. corrections given...
We study the process $e^+e^- \to \pi^+\pi^-\eta \gamma$, where photon is radiated from initial state. About 8000 fully reconstructed events of this are selected BaBar data sample with an integrated luminosity 469~fb$^{-1}$. Using $\pi^+\pi^-\eta$ invariant mass spectrum we measure \pi^+\pi^-\eta$ cross section in $e^+e^-$ center-of-mass energy range 1.15 to 3.5 GeV. The well described by Vector-Meson Dominance model four $\rho$-like states. observe $49\pm9$ $J/\psi$ decay $\pi^+\pi^-\eta$,...
A study of the two-body decays B^{±}→X_{cc[over ¯]}K^{±}, where X_{cc[over ¯]} refers to one charmonium state, is reported by BABAR Collaboration using a data sample 424 fb^{-1}. The absolute determination branching fractions for these are significantly improved compared previous measurements. Evidence found decay B^{+}→X(3872)K^{+} at 3σ level. fraction B[B^{+}→X(3872)K^{+}]=[2.1±0.6(stat)±0.3(syst)]×10^{-4} measured first time. It follows that B[X(3872)→J/ψπ^{+}π^{-}]=(4.1±1.3)%,...
We study the processes $\gamma \gamma \to \eta_c \eta' K^+ K^-$, $\eta' \pi^+ \pi^-$, and $\eta \pi^-$ using a data sample of 519 $fb^{-1}$ recorded with BaBar detector operating at SLAC PEP-II asymmetric-energy $e^+e^-$ collider center-of-mass energies near $\Upsilon(nS)$ ($n = 2,3,4$) resonances. This is first observation decay $\eta_c K^-$ we measure branching fraction $\Gamma(\eta_c K^-)/(\Gamma(\eta_c \pi^-)=0.644\pm 0.039_{\rm stat}\pm 0.032_{\rm sys}$. Significant interference...
A dedicated measurement of additional radiation in e+e−→μ+μ−γ and e+e−→π+π−γ initial-state-radiation events is presented using the full BABAR data sample. For first time results are at next-to- next-to-next-to-leading order, with one two photons, respectively, for from initial final states. Comparison predictions phokhara afkqed Monte Carlo generators performed, revealing discrepancies one-photon rates angular distributions former. This disagreement has a negligible effect on e+e−→π+π−(γ)...
In the United States and many other countries, there has been limited attempt to develop a trauma system that addresses unique situations occur in rural areas. Rather planners have attempted simply extend urban based into communities. This extension does not address needs of majority patients who are injured communities.A review types seen communities, volume these destination protocols used communities as taught by ACS/ATLS implications CDC Guidelines for Field Triage Injured Patients...
The Feynman-Metropolis-Teller treatment of compressed atoms has been recently generalized to relativistic regimes and applied the description static rotating white dwarfs in general relativity. We present here extension this case finite temperatures construct corresponding equation state (EOS) system; applicable a wide regime densities that includes both neutron star outer crusts. mass-radius relation at obeying new EOS apply it analysis ultra low-mass with $M\lesssim 0.2 M_\odot$. In...
The process $e^+e^- \to \pi^+\pi^-2\pi^0\gamma$ is investigated by means of the initial-state radiation technique, where a photon emitted from incoming electron or positron. Using $454.3 \rm{fb}^{-1}$ data collected around center-of-mass energy $\sqrt{s} = 10.58 \rm{GeV}$ BaBar experiment at SLAC, approximately 150000 signal events are obtained. corresponding non-radiative cross section measured with relative uncertainty $3.6\%$ in region $1.5 \rm{GeV}$, surpassing all existing measurements...
The decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}_{S}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been studied using $430\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events produced at a center-of-mass energy around 10.6 GeV the PEP-II collider and with BABAR detector. mass spectrum of ${K}^{\ensuremath{-}}{K}_{S}$ system measured...
A bstract Lepton Flavour Universality tests with semileptonic Λ b → c * decays are important to corroborate the present anomalies in similar ratios $$ {R_D}_{{}^{\left(\ast \right)}} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mi>D</mml:mi> </mml:msub> <mml:msup> <mml:mrow /> <mml:mfenced> <mml:mo>∗</mml:mo> </mml:mfenced> </mml:msup> </mml:math> , and can provide complementary constraints on possible origins of these beyond Standard Model. In...
We study the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ in double-tag mode and measure for first time ${\ensuremath{\gamma}}^{\ensuremath{\star}}{\ensuremath{\gamma}}^{\ensuremath{\star}}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}$ transition form factor ${F}_{{\ensuremath{\eta}}^{\ensuremath{'}}}({Q}_{1}^{2},{Q}_{2}^{2})$ momentum-transfer range $2<{Q}_{1}^{2}$, ${Q}_{2}^{2}<60\text{ }\text{...
We study the processes $e^+ e^-\to K^0_S K^0_L\pi^0\gamma$, $K^0_S K^0_L\eta\gamma$, and K^0_L\pi^0\pi^0\gamma$, where photon is radiated from initial state, providing cross section measurements for hadronic final states over a continuum of center-of-mass energies. The results are based on 469~$fb^{-1}$ data collected at or near $\Upsilon(4S)$~ resonance with BaBar detector SLAC. present first K^0_L\pi^0$, K^0_L\eta$, K^0_L\pi^0\pi^0$ sections up to energy 4~GeV, their intermediate...
We study the processes e+e−→π+π−π0π0π0γ and π+π−π0π0ηγ in which an energetic photon is radiated from initial state. The data are collected with BABAR detector at SLAC. About 14 000 4700 events, respectively, selected a sample corresponding to integrated luminosity of 469 fb−1. invariant mass hadronic final state defines effective e+e− center-of-mass energy. From spectra, first precise measurement e+e−→π+π−π0π0π0 cross section ever e+e−→π+π−π0π0η performed. energies range threshold 4.35 GeV....
The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related production, cooling, accumulation and acceleration. In this paper layout positron driven source known as Low EMittance Muon Accelerator (LEMMA) concept is presented. beam, stored in ring with high energy acceptance low emittance, extracted multi-target system, produce pairs at threshold. This solution alleviates issues power deposited integrated Peak Energy Density Deposition...
Many scenarios of physics beyond the Standard Model predict existence new gauge singlets, which might be substantially lighter than weak scale. The experimental constraints on additional scalars with masses in MeV to GeV range could significantly weakened if they interact predominantly leptons rather quarks. At an $e^+e^-$ collider, such a leptophilic scalar ($\phi_L$) would produced through radiation from $\tau$ lepton. We report herein search for $e^+e^- \to \tau^+\tau^- \phi_L$, $\phi_L...