K. T. Flood
A5045155988- 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
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Superconducting Materials and Applications
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- Stochastic processes and statistical mechanics
- Advanced Data Storage Technologies
- Quantum chaos and dynamical systems
California Institute of Technology
2011-2022
University of Hawaii System
2021
University of Hawaiʻi at Mānoa
2021
Massachusetts Institute of Technology
2013
Campbell Collaboration
2013
University of Wisconsin–Madison
2005-2011
Stanford University
1998-2011
UCLouvain
2011
Institute of High Energy Physics
2011
Laboratoire d’Annecy de Physique des Particules
2002-2006
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...
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
A precise measurement of the cross section process $e^+e^-\toπ^+π^-(γ)$ from threshold to an energy 3GeV is obtained with initial-state radiation (ISR) method using 232fb$^{-1}$ data collected BaBar detector at $e^+e^-$ center-of-mass energies near 10.6GeV. The ISR luminosity determined a study leptonic $e^+e^-\toμ^+μ^-(γ)γ_{\rm ISR}$, which found agree next-to-leading-order QED prediction within 1.1%. for systematic uncertainty 0.5% in dominant $ρ$ resonance region. leading-order hadronic...
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...
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 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 study the process $e^+e^-\to J/\psi\pi^{+}\pi^{-}$ with initial-state-radiation events produced at PEP-II asymmetric-energy collider. The data were recorded BaBar detector center-of-mass energies 10.58 and 10.54 GeV, correspond to an integrated luminosity of 454 $\mathrm{fb^{-1}}$. investigate $J/\psi \pi^{+}\pi^{-}$ mass distribution in region from 3.5 5.5 $\mathrm{GeV/c^{2}}$. Below 3.7 $\mathrm{GeV/c^{2}}$ $\psi(2S)$ signal dominates, above 4 there is a significant peak due Y(4260). A...
A precise measurement of the cross section for process e+e−→K+K−(γ) from threshold to an energy 5 GeV is obtained with initial-state radiation (ISR) method using 232 fb−1 data collected BABAR detector at e+e− center-of-mass energies near 10.6 GeV. The uses effective ISR luminosity determined e+e−→μ+μ−(γ)γISR same set. corresponding lowest-order contribution hadronic vacuum polarization term in muon magnetic anomaly found be aμKK,LO=(22.93±0.18stat±0.22syst)×10−10. charged kaon form factor...
We study the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\omega}$ using a data sample of $519.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded by BABAR detector at SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider center-of-mass energies near $\ensuremath{\Upsilon}(nS)$ ($n=2,3,4$) resonances. confirm existence charmoniumlike resonance $X(3915)$ decaying to $J/\ensuremath{\psi}\ensuremath{\omega}$ with...
We study the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$, ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, and ${K}^{+}{K}^{\ensuremath{-}}{K}^{+}{K}^{\ensuremath{-}}\ensuremath{\gamma}$, where photon is radiated from initial state. About 84 000, 8000, 4200 fully reconstructed events, respectively, are selected $454\text{...
We use 429 fb$^{-1}$ of $e^+e^-$ collision data collected at the $\Upsilon(4S)$ resonance with BABAR detector to measure radiative transition rate $b\rightarrow s\gamma$ a sum 38 exclusive final states. The inclusive branching fraction minimum photon energy 1.9 GeV is found be $\mathcal{B}(\bar B \rightarrow X_{s}\gamma)=(3.29\pm 0.19\pm 0.48)\times 10^{-4}$ where first uncertainty statistical and second systematic. also moments spectrum extract best fit values for heavy-quark parameters,...
Recent astrophysical and terrestrial experiments have motivated the proposal of a dark sector with GeV-scale gauge boson force carriers new Higgs bosons. We present search for using 516 fb-1 data collected BABAR detector. do not observe significant signal we set 90% confidence level upper limits on product Standard Model-dark mixing angle coupling constant.
The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}$ cross section and the proton magnetic form factor have been measured in center-of-mass energy range from 3.0 to 6.5 GeV using initial-state radiation technique with an undetected photon. This is first measurement of at energies higher than 4.5 GeV. analysis based on $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity collected BABAR detector PEP-II collider ${e}^{+}{e}^{\ensuremath{-}}$ near 10.6...
We present improved measurements of $CP$-violation parameters in the decays ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${B}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$, branching fractions for ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ ${B}^{0}\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\pi}}^{0}$....
Inclusive production cross sections of $\pi^\pm$, $K^\pm$ and $p\bar{p}$ per hadronic $e^+e^-$ annihilation event in are measured at a center-of-mass energy 10.54 GeV, using relatively small sample very high quality data from the BaBar experiment PEP-II $B$-factory SLAC National Accelerator Laboratory. The drift chamber Cherenkov detector provide clean samples identified over wide range momenta. Since is below threshold to produce $B\bar{B}$ pair, with $B$ bottom-quark meson, these represent...
We present a measurement of the b-quark inclusive fragmentation function in ${Z}^{0}$ decays using novel kinematic B-hadron energy reconstruction technique. The was performed 350 000 hadronic events recorded SLD experiment at SLAC between 1997 and 1998. small stable SLC beam spot charge-coupled-device--based vertex detector were used to reconstruct B-decay vertices with high efficiency purity, provide precise measurements quantities this measured B good resolution over full range. compared...
We present searches for rare or forbidden charm decays of the form ${X}_{c}^{+}\ensuremath{\rightarrow}{h}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\ell}}^{\ensuremath{\mp}}{\ensuremath{\ell}}^{(\ensuremath{'})+}$, where ${X}_{c}^{+}$ is a hadron (${D}^{+}$, ${D}_{s}^{+}$, ${\ensuremath{\Lambda}}_{c}^{+}$), ${h}^{\ifmmode\pm\else\textpm\fi{}}$ pion, kaon, proton, and ${\ensuremath{\ell}}^{(\ensuremath{'})\ifmmode\pm\else\textpm\fi{}}$ an electron muon. The analysis based on $384\text{...