A5016236508- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Numerical methods for differential equations
- International Science and Diplomacy
- Noncommutative and Quantum Gravity Theories
- Silicon and Solar Cell Technologies
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2013-2022
University of Sassari
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2020
Budker Institute of Nuclear Physics
2014-2020
University of California, Irvine
2020
University of Bologna
2020
University of the Basque Country
2018
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2018
Laboratoire d’Annecy de Physique des Particules
2018
Institut National de Physique Nucléaire et de Physique des Particules
2018
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...
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...
We search for the rare flavor-changing neutral current process $B^{+}\rightarrow K^{+}τ^{+}τ^{-}$ using data from BABAR experiment. The sample, collected at center-of-mass energy of $Υ{(4S)}$ resonance, corresponds to a total integrated luminosity 424 fb$^{-1}$ and 471 million $B\overline{B}$ pairs. reconstruct one $B$ meson, produced in $Υ{(4S)}\rightarrow B^{+} B^{-}$ decay, many hadronic decay modes activity compatible with K^{+} τ^{+}τ^{-}$ rest event. Each $τ$ lepton is required...
We study the lepton forward-backward asymmetry ${\mathcal{A}}_{FB}$ and longitudinal ${K}^{*}$ polarization ${F}_{L}$, as well an observable ${P}_{2}$ derived from them, in rare decays $B\ensuremath{\rightarrow}{K}^{*}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$, where ${\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ is either ${e}^{+}{e}^{\ensuremath{-}}$ or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, using full sample of 471 million...
We have performed a search for CPT violation in neutral charm meson oscillations. While flavor mixing the sector is predicted to be small by Standard Model, it still possible investigate through study of proper time dependence asymmetry right-sign decay rates $D^0\to K^-π^+$ and $\d0b\to K^+π^-$. This related violating complex parameter $ξ$ parameters $x$ $y$: $A_{CPT}\propto{\rm Re} ξy-{\rm Im} ξx$ . Our 95% confidence level limit $-0.0068
We study the processes $e^+ e^-\to K_S^0 K_L^0 \gamma$, $K_S^0 \pi^+\pi^-\gamma$, and K^+K^-\gamma$, where photon is radiated from initial state, providing cross section measurements for hadronic states over a continuum of center-of-mass energies. The results are based on 469 fb$^{-1}$ data collected with BaBar detector at SLAC. observe $\phi(1020)$ resonance in K_L^0$ final state measure product its electronic width branching fraction about 3% uncertainty. present measurement $ energy range...
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...
We present a search for neutral, long-lived particle L that is produced in e+ e- collisions and decays at significant distance from the interaction point into various flavor combinations of two oppositely charged tracks. The analysis uses an data sample with luminosity 489.1 fb(-1) collected by BABAR detector ϒ(4S), ϒ(3S), ϒ(2S) resonances just below ϒ(4S). Fitting two-track mass distribution signal peak, we do not observe signal, set 90% confidence level upper limits on product production...
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 $\pi^+\pi^-\eta$,...
Based on a sample of 500 million ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ events recorded by the BABAR detector at c.m. energies close to 10.6 GeV, we report study decay ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e}$. We measure ratio branching fractions,...
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...
We present Dalitz plot analyses for the decays of $B$ mesons to ${D}^{\ensuremath{-}}{D}^{0}{K}^{+}$ and ${\overline{D}}^{0}{D}^{0}{K}^{+}$. report observation ${D}_{s1}^{*}(2700{)}^{+}$ resonance in these two channels obtain measurements mass $M({D}_{s1}^{*}(2700{)}^{+})={2699}_{\ensuremath{-}7}^{+14}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ width $\mathrm{\ensuremath{\Gamma}}({D}_{s1}^{*}(2700{)}^{+})={127}_{\ensuremath{-}19}^{+24}\text{ }\mathrm{MeV}$, including statistical systematic...
We report on a search for eleven lepton-number violating processes B+→X−ℓ+ℓ'+ with X−=K−, π−, ρ−, K*−, or D− and ℓ+/ℓ'+=e+ μ+, using sample of 471±3 million B¯B events collected the BABAR detector at PEP-II e+e− collider SLAC National Accelerator Laboratory. find no evidence any these modes place 90% confidence level upper limits their branching fractions in range (1.5–26)×10−7.Received 5 November 2013DOI:https://doi.org/10.1103/PhysRevD.89.011102© 2014 American Physical Society
We measure the mass difference, \Delta m_0, between D*(2010)+ and D0 natural line width, \Gamma, of transition -> pi+. The data were recorded with BABAR detector at center-of-mass energies near Upsilon(4S) resonance, correspond to an integrated luminosity approximately 477 1/fb. is reconstructed in decay modes K- pi+ pi- For mode we obtain Gamma = (83.4 +- 1.7 1.5) keV m_0 (145 425.6 0.6 1.8) keV, where quoted errors are statistical systematic, respectively. \Gamma (83.2 1.5 2.6) 426.6 0.5...
We study the processes γγ→K+K−η and γγ→K+K−π0 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 Υ(nS) (n=2,3,4) resonances. observe ηc→K+K−π0 ηc→K+K−η decays, measure their relative branching fraction, perform Dalitz plot analysis for each decay. K∗0(1430)→Kη decay its fraction to Kπ mode be R(K∗0(1430))=B(K∗0(1430)→Kη)B(K∗0(1430)→Kπ)=0.092±0.025+0.010−0.025. The results correspond first...
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)...
We present measurements of Collins asymmetries in the inclusive process $e^+e^- \rightarrow h_1 h_2 X$, $h_1h_2=KK,\, K\pi,\, \pi\pi$, at center-of-mass energy 10.6 GeV, using a data sample 468 fb$^{-1}$ collected by BaBar experiment PEP-II $B$ factory SLAC National Accelerator Center. Considering hadrons opposite thrust hemispheres hadronic events, we observe clear azimuthal ratio unlike- to like-sign, and all charged $h_1 h_2$ pairs, which increase with hadron energies. The $K\pi$ are...
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...