K. Grießinger
A5066956149- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Theoretical and Computational Physics
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Urinary Bladder and Prostate Research
- Radiation Therapy and Dosimetry
- Prostate Cancer Diagnosis and Treatment
- Diverse Scientific and Economic Studies
- Nuclear reactor physics and engineering
- Lanthanide and Transition Metal Complexes
- Smart Grid and Power Systems
- Optical Systems and Laser Technology
Johannes Gutenberg University Mainz
2012-2022
University of Sassari
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2020
University of Bologna
2020
Budker Institute of Nuclear Physics
2014-2020
University of California, Irvine
2020
Université Paris Cité
2019
Délégation Paris 7
2019
Sorbonne Université
2019
Institut National de Physique Nucléaire et de Physique des Particules
2019
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 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 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)...
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...
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 $\gamma \gamma \to K^0_S K^{\pm}\pi^{\mp}$ and K^+ K^- \pi^0$ 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. observe $\eta_c$ decays to both final states perform Dalitz plot analyses model-independent partial wave analysis technique. This allows measurement mass-dependence $I=1/2$ $K \pi$ $\mathcal{S}$-wave amplitude...
Based on the full BABAR data sample of 466.5 million $B\overline{B}$ pairs, we present measurements electron spectrum from semileptonic $B$ meson decays. We fit inclusive to distinguish Cabibbo-Kobayashi-Maskawa (CKM) suppressed $B\ensuremath{\rightarrow}{X}_{u}e\ensuremath{\nu}$ decays CKM-favored $B\ensuremath{\rightarrow}{X}_{c}e\ensuremath{\nu}$ decays, and various other backgrounds, determine total branching fraction...
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model $\ensuremath{\tau}$ neutrino strength $|{U}_{\ensuremath{\tau}4}{|}^{2}$, corresponding to absolute square extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from BABAR experiment, total integrated luminosity $424\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, are analyzed using kinematic approach makes no assumptions...
We study the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, and...
A new mechanism has been proposed to simultaneously explain the presence of dark matter and matter-antimatter asymmetry in universe. This scenario predicts exotic $B$ meson decays into a baryon sector anti-baryon ($\psi_D$) with branching fractions accessible at factories. We present search for $B \rightarrow \Lambda \psi_D$ using data collected by $BABAR$ experiment SLAC. reaction is identified fully reconstructing accompanying requiring single $\Lambda$ remaining particles. No significant...
Cross-section measurements of the exclusive p(e, e′K +)Λ, Σ 0electroproduction reactions have been performed at Mainz Microtron MAMI in A1 spectrometer facility using for first time KAOS kaon detection. These processes were studied a kinematical region not covered by any previous experiment. The nucleon was probed its third-resonance with virtual photons low four-momenta, Q 2 = 0.030–0.055 (GeV/c)2. data indicate smooth transition Q2 from photoproduction to electroproduction cross-sections....
A new dark sector antibaryon, denoted ψD, could be produced in decays of B mesons. This Letter presents a search for B+→ψD+p (and the charge conjugate) e+e− annihilations at 10.58 GeV, using data collected BABAR experiment. Data corresponding to an integrated luminosity 398 fb−1 are analyzed. No evidence signal is observed. Branching fraction upper limits range from 10−7–10−5 obtained 90% confidence level masses 1.0<mψD<4.3 GeV/c2. The result also reinterpreted provide first on...
Using the entire <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="normal">ϒ</a:mi><a:mo stretchy="false">(</a:mo><a:mn>4</a:mn><a:mi>S</a:mi><a:mo stretchy="false">)</a:mo></a:math> dataset, first two-dimensional unbinned angular analysis of semileptonic decay <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mover accent="true"><f:mi>B</f:mi><f:mo stretchy="false">¯</f:mo></f:mover><f:mo...
We present a new technique, ``tau polarimetry,'' for measuring the longitudinal beam polarization in an ${e}^{+}{e}^{\ensuremath{-}}$ collider through analysis of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events. By exploiting sensitivity $\ensuremath{\tau}$ decay kinematics to beams, we demonstrate that can be measured with 3 per mil systematic uncertainty at interaction point using technique is independent spin and...
At the Institut für Kernphysik in Mainz, Germany, microtron MAMI has been upgraded to 1.5 GeV electron beam energy and can now be used study strange hadronic systems. The magnetic spectrometer KAOS from GSI was dismantled re-installed facility operated by A1 collaboration. spectrometer's primary purpose is strangeness electro-production. Its compact design its capability detect negative positive charged particles simultaneously under forward scattering angles complements existing...
We measure the mass difference, Δm_{+}, between D^{*}(2010)^{+} and D^{+} using decay chain D^{*}(2010)^{+}→D^{+}π^{0} with D^{+}→K^{-}π^{+}π^{+}. The data were recorded BABAR detector at center-of-mass energies near ϒ(4S) resonance, correspond to an integrated luminosity of approximately 468 fb^{-1}. Δm_{+}=(140 601.0±6.8[stat]±12.9[syst]) keV. combine this result a previous measurement Δm_{0}≡m(D^{*}(2010)^{+})-m(D^{0}) obtain Δm_{D}=m(D^{+})-m(D^{0})=(4824.9±6.8[stat]±12.9[syst]) These...
Using the entire BaBar $Υ(4S)$ data set, first two-dimensional unbinned angular analysis of semileptonic decay $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ is performed, employing hadronic reconstruction tag-side $B$ meson from $Υ(4S)\to B\overline{B}$. Here, $\ell$ denotes light charged leptons $e$ and $μ$. A novel data-driven signal-background separation procedure with minimal dependence on simulation developed. This preserves all multi-dimensional correlations present in data. The...