A5050556296- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Astrophysics and Cosmic Phenomena
- Stochastic processes and statistical mechanics
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- advanced mathematical theories
- Cold Atom Physics and Bose-Einstein Condensates
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2016-2025
University of Ferrara
2016-2025
Institute of High Energy Physics
2015-2024
China Center of Advanced Science and Technology
2015-2024
COMSATS University Islamabad
2015-2024
Ruhr University Bochum
2024
Budker Institute of Nuclear Physics
2020-2024
Siberian Branch of the Russian Academy of Sciences
2024
China University of Geosciences
2024
Carnegie Mellon University
2024
Based on the full BABAR data sample, we report improved measurements of ratios R(D(*))=B(B[over ¯]→D(*)τ(-)ν[over ¯](τ))/B(B[over ¯]→D(*)ℓ(ℓ)(-)ν[over ¯](ℓ)), where ℓ is either e or μ. These are sensitive to new physics contributions in form a charged Higgs boson. We measure R(D)=0.440±0.058±0.042 and R(D(*))=0.332±0.024±0.018, which exceed standard model expectations by 2.0σ 2.7σ, respectively. Taken together, our results disagree with these at 3.4σ level. This excess cannot be explained...
Based on the full BaBar data sample, we report improved measurements of ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B l Nu), where is either e or mu. These are sensitive to new physics contributions in form a charged Higgs boson. We measure R(D) 0.440 +- 0.058 0.042 and R(D*) 0.332 0.024 0.018, which exceed Standard Model expectations by 2.0 sigma 2.7 sigma, respectively. Taken together, our results disagree with these at 3.4 level. This excess cannot be explained boson type II two-Higgs-doublet...
Dark sectors charged under a new Abelian interaction have recently received much attention in the context of dark matter models. These models introduce light mediator, so-called photon (A′), connecting sector to standard model. We present search for reaction e+e−→γA′, A′→e+e−, μ+μ− using 514 fb−1 data collected with BABAR detector. observe no statistically significant deviations from model predictions, and we set 90% confidence level upper limits on mixing strength between at 10−4−10−3...
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...
The cross section for the process $e^+e^-\to \pi^+\pi^-J/\psi$ is measured precisely at center-of-mass energies from 3.77 to 4.60~GeV using 9~fb$^{-1}$ of data collected with BESIII detector operating BEPCII storage ring. Two resonant structures are observed in a fit section. first resonance has mass $(4222.0\pm 3.1\pm 1.4)$~MeV/$c^2$ and width $(44.1\pm 4.3\pm 2.0)$~MeV, while second one $(4320.0\pm 10.4 \pm 7.0)$~MeV/$c^2$ $(101.4^{+25.3}_{-19.7}\pm 10.2)$~MeV, where errors statistical...
We extract the $e^+e^-\rightarrow \pi^+\pi^-$ cross section in energy range between 600 and 900 MeV, exploiting method of initial state radiation. A data set with an integrated luminosity 2.93 fb$^{-1}$ taken at a center-of-mass 3.773 GeV BESIII detector BEPCII collider is used. The measured systematic uncertainty 0.9%. pion form factor $|F_\pi|^2$ as well contribution to leading order hadronic vacuum polarization $(g-2)_\mu$. find this value be $a_\mu^{\pi\pi,\rm LO}(600-900\;\rm MeV) =...
Many models of physics beyond the Standard Model predict existence new Abelian forces with gauge bosons mediating interactions between "dark sectors" and Model. We report a search for dark boson Z' coupling only to second third generations leptons in reaction e+e- -> mu+mu- Z', using 514 fb-1 data collected by BABAR experiment. No significant signal is observed masses range 0.212 - 10 GeV. Limits on parameter g' as low 7x10^-4 are derived, leading improvements bounds compared those...
The cross sections of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{h}_{c}$ at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating Beijing Electron Positron Collider. found be same order magnitude as those ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ and...
We report a study of the processes e+e−→K+D−sD*0 and K+D*−sD0 based on e+e− annihilation samples collected with BESIII detector operating at BEPCII five center-of-mass energies ranging from 4.628 to 4.698 GeV total integrated luminosity 3.7 fb−1. An excess events over known contributions conventional charmed mesons is observed near D−sD*0 D*−sD0 mass thresholds in K+ recoil-mass spectrum for √s=4.681 GeV. The structure matches mass-dependent-width Breit-Wigner line shape, whose pole width...
In a sample of $471\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector at PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider we study rare decays $B\ensuremath{\rightarrow}{K}^{(*)}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$, where ${\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ is either or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. We report results on partial branching fractions and isospin...
We search for the flavor-changing neutral-current decays $B\ensuremath{\rightarrow}{K}^{(*)}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, and invisible $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ via $B\ensuremath{\rightarrow}{K}^{(*)}J/\ensuremath{\psi}$ $B\ensuremath{\rightarrow}{K}^{(*)}\ensuremath{\psi}(2S)$, respectively, using a data sample of...
From December 2011 to May 2014, about 5 fb−1 of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 study charmonium-like states higher excited charmonium states. The time-integrated luminosity collected sample is measured a precision 1% by analyzing events produced large-angle Bhabha scattering process.
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected with the BABAR detector at PEP-II collider, an center-of-mass energy 10.6 GeV. From analysis invariant mass spectrum, dependence cross section for measured from threshold to 4.5 ratio electric and magnetic form factors, |G_E/G_M|, asymmetry in proton angular distribution are masses below 3 We also measure branching fractions decays J/psi psi(2S) anti p.
Although CP violation in the B meson system has been well established by factories, there no direct observation of time-reversal violation. The decays entangled neutral mesons into definite flavor states (B(0) or B(0)), and J/ψK(L)(0) ccK(S)(0) final (referred to as B(+) B(-)), allow comparisons between probabilities four pairs T-conjugated transitions, for example, B(0) → B(-) B(0), a function time difference two decays. Using 468 × 10(6) BB produced Υ(4S) collected BABAR detector at SLAC,...
We report the first measurement of absolute hadronic branching fractions ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon at ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$ production threshold, in 30 years since discovery. In total, 12 Cabibbo-favored decay modes are analyzed with a double-tag technique, based on sample $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ collisions $\sqrt{s}=4.599\text{...
Based on data samples collected with the BESIII detector at BEPCII collider nine center of mass energies from 4.21 to 4.42 GeV, we search for production e^{+}e^{-}→ωχ_{cJ} (J=0, 1, 2). The process e^{+}e^{-}→ωχ_{c0} is observed first time, and Born cross sections sqrt[s]=4.23 4.26 GeV are measured be (55.4±6.0±5.9) (23.7±5.3±3.5) pb, respectively, where uncertainties statistical second systematic. ωχ_{c0} signals other seven e^{+}e^{-}→ωχ_{c1} ωχ_{c2} not significant, upper limits...
Using a data sample collected with the BESIII detector operating at BEPCII storage ring, we observe new neutral state Z_{c}(3900)^{0} significance of 10.4σ. The mass and width are measured to be 3894.8±2.3±3.2 MeV/c^{2} 29.6±8.2±8.2 MeV, respectively, where first error is statistical second systematic. Born cross section for e^{+}e^{-}→π^{0}π^{0}J/ψ fraction it attributable π^{0}Z_{c}(3900)^{0}→π^{0}π^{0}J/ψ in range E_{c.m.}=4.19-4.42 GeV also determined. We interpret this as partner...
Using data collected with the BESIII detector operating at Beijing Electron Positron Collider center-of-mass energies of sqrt[s]=4.23, 4.26, and 4.36 GeV, we observe e(+)e(-)→π(0)π(0)hc for first time. The Born cross sections are measured found to be about half those e(+)e(-)→π(+)π(-)hc within less than 2σ. In π(0)hc mass spectrum, a structure 4.02 GeV/c(2) is found. It most likely neutral isospin partner Zc(4020)(±) observed in process being A fit invariant width Zc(4020)(0) fixed that its...
We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $467.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at $\ensuremath{\Upsilon}(4S)$ resonance with BABAR detector SLAC PEP-II $B$-Factory. select sample of events one completely reconstructed ${B}^{\ensuremath{-}}$ in hadronic mode (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{X}^{\ensuremath{-}}$ and...
We report the results of a study exclusive charmless semileptonic decays, B^0 --> pi^- l^+ nu, B^+ pi^0 omega eta nu and eta^' (l = e or mu) undertaken with approximately 462x10^6 B\bar{B} pairs collected at Upsilon(4S) resonance BABAR detector. The analysis uses events in which signal B decays are reconstructed loose neutrino reconstruction technique. obtain partial branching fractions several bins q^2, square momentum transferred to lepton-neutrino pair, for nu. From these distributions,...
We perform amplitude analyses of the decays ${B}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}_{S}^{0}$, ${B}^{+}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{K}^{+}$, and ${B}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{S}^{0}{K}^{+}$, measure $CP$-violating parameters partial branching fractions. The results are based on a data sample approximately $470\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ decays, collected with BABAR detector at PEP-II...
We study the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(2S){\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ with initial-state-radiation events produced at PEP-II asymmetric-energy collider. The data were recorded BABAR detector center-of-mass energies and near $\mathrm{\ensuremath{\Upsilon}}(\mathrm{nS})$ ($n=2,3,4$) resonances correspond to an integrated luminosity of $520\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. investigate...
We present measurements of Collins asymmetries in the inclusive process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}X$, where $\ensuremath{\pi}$ stands for charged pions, at a center-of-mass energy 10.6 GeV. use data sample $468\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by BABAR experiment PEP-II $B$ factory SLAC, and consider pairs pions produced opposite hemispheres hadronic events. observe clear distributions azimuthal angles two...