T. Orimoto
A5084122166- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Stochastic processes and financial applications
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Advanced NMR Techniques and Applications
- Magnetic confinement fusion research
Northeastern University
2016-2025
Universidad del Noreste
2024-2025
Institute of High Energy Physics
2012-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
European Organization for Nuclear Research
2011-2023
Northwestern University
2023
Center for Migration Studies of New York
2009-2015
University at Buffalo, State University of New York
2015
Boston University
2014
We study the decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using $117\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $Y(4S)$ resonance with BABAR detector PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring. measure branching fractions $\mathcal{B}$...
We present a measurement of the cross section process e(+)e(-)-->pi(+)pi(-)psi(2S) from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at SLAC PEP-II e(+)e(-) storage rings. The study is based on 298 fb(-1) data recorded with BABAR detector. A structure observed in not far above threshold, near 4.32 GeV. also investigate compatibility this Y(4260) previously reported by experiment.
We present results on time-dependent CP asymmetries in neutral B decays to several eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B collected between 1999 and 2002 with the BABAR detector at PEP-II asymmetric-energy factory SLAC. study events which one meson is fully reconstructed final state containing charmonium other determined be either B(0) or B(-0) from its decay products. amplitude asymmetry, standard model proportional sin2beta, derived...
The e+e−→pp¯ cross section is determined over a range of pp¯ masses, from threshold to 4.5 GeV/c2, by studying the e+e−→pp¯γ process. data set corresponds an integrated luminosity 232 fb−1, collected with BABAR detector at PEP-II storage ring, e+e− center-of-mass energy 10.6 GeV. mass dependence ratio electric and magnetic form factors, |GE/GM|, measured for masses below 3 GeV/c2; its value found be significantly larger than 1 up 2.2 GeV/c2. We also measure J/ψ→pp¯ ψ(2S)→pp¯ branching...
This paper reports measurements of processes: e+e−→γKS0K±π∓, e+e−→γK+K−π0, e+e−→γϕη, and e+e−→γϕπ0. The initial-state radiated photon allows to cover the hadronic final state in energy range from thresholds up ≈4.6 GeV. overall size data sample analyzed is 232 fb−1, collected by BABAR detector running at PEP-II e+e− storage ring. From Dalitz plot analysis KS0K±π∓ state, moduli, relative phase isoscalar isovector components e+e−→KK*(892) cross section are determined. Parameters ϕ ρ...
We study e+e−→J/ψ cc¯ by measuring the invariant mass distribution recoiling against fully reconstructed J/ψ decays, using 124 fb−1 of data collected at a center-of-mass energy 10.6 GeV with BABAR detector. observe signals for ηc(1S), χc0, and ηc(2S) in recoil distribution, thus confirming previous measurements. measure σ(e+e−→J/ψ+cc¯)B(cc¯→>2 charged) to be 17.6±2.8(stat)−2.1+1.5(syst) fb, 10.3±2.5(stat)−1.8+1.4(syst) 16.4±3.7(stat)−3.0+2.4(syst) fb cc¯=ηc(1S), ηc(2S), respectively.Received...
We study the processes e+e−→2(π+π−)π0γ, 2(π+π−)ηγ, K+K−π+π−π0γ and K+K−π+π−ηγ with hard photon radiated from initial state. About 20 000, 4300, 5500, 375 fully reconstructed events, respectively, are selected 232 fb−1 of BABAR data. The invariant mass hadronic final state defines effective e+e− center-of-mass energy, so that obtained cross sections threshold to about 5 GeV can be compared corresponding direct measurements, currently available only for ηπ+π− ωπ+π− submodes e+e−→2(π+π−)π0...
The BaBar detector operated successfully at the PEP-II asymmetric e+e− collider SLAC National Accelerator Laboratory from 1999 to 2008. This report covers upgrades, operation, and performance of systems, as well trigger, online offline computing, aspects event reconstruction since beginning data taking.
We search for the production of doubly charmed baryons in e+e− annihilations at or near a center-of-mass energy 10.58 GeV, data sample with an integrated luminosity 232 fb−1 recorded BABAR detector PEP-II storage ring Stanford Linear Accelerator Center. Ξ+cc final states Λ+cK−π+ and Ξ0cπ+, Ξ++cc Λ+cK−π+π+ Ξ0cπ+π+. find no evidence baryons.Received 18 May 2006DOI:https://doi.org/10.1103/PhysRevD.74.011103©2006 American Physical Society
We present a study of the decays B0,+→J/ψωK0,+ using 383×106 B¯¯¯B events obtained with BABAR detector at PEP-II. observe Y(3940)→J/ψω, mass 3914.6+3.8−3.4(stat)±2.0(syst) MeV/c2, and width 34+12−8(stat)±5(syst) MeV. The ratio B0 B+ decay to YK is 0.27+0.28−0.23(stat)+0.04−0.01(syst), relevant branching fractions are reported.Received 14 November 2007DOI:https://doi.org/10.1103/PhysRevLett.101.082001©2008 American Physical Society
We present a study of resonances in exclusive decays $B$ mesons to ${\overline{D}}^{(*)}{D}^{(*)}K$. report the observation $B\ensuremath{\rightarrow}{\overline{D}}^{(*)}{D}_{s1}^{+}(2536)$ where ${D}_{s1}^{+}(2536)$ is reconstructed ${D}^{*0}{K}^{+}$ and ${D}^{*+}{K}_{S}^{0}$ decay channels. also $B\ensuremath{\rightarrow}\ensuremath{\psi}(3770)K$ $\ensuremath{\psi}(3770)$ ${\overline{D}}^{0}{D}^{0}$ ${D}^{\ensuremath{-}}{D}^{+}$. In addition, we an enhancement for...
We present a measurement of the direct CP violating asymmetry in decay B0-->K+pi(-) using data sample 227x10(6) Upsilon(4S)-->BB decays collected with BABAR detector at PEP-II asymmetric-energy e(+)e(-) collider SLAC. observe total signal yield nK-(pi(+))+nK+(pi(-))=1606+/-51 and measure (nK-(pi(+))-nK+(pi(-)))/(nK-(pi(+))+nK+(pi(-)))=-0.133+/-0.030(stat)+/-0.009(syst). The probability observing such an absence violation is 1.3x10(-5), corresponding to 4.2 standard deviations.
We measure the branching fraction for flavor-changing neutral-current process B-->X(s)l(+)l(-) with a sample of 89x10(6) Upsilon(4S)-->BBmacr; events recorded BABAR detector at PEP-II e(+)e(-) storage ring. The final state is reconstructed from or micro(+)micro(-) pairs and hadronic system X(s) consisting one K+/- K(0)(S) up to two pions, most pi(0). observe signal 40+/-10(stat)+/-2(syst) extract inclusive B(B-->X(s)l(+)l(-))=(5.6+/-1.5(stat)+/-0.6(exp syst)+/-1.1(model syst))x10(-6)...
The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ has been studied at a center-of-mass energy near the $\ensuremath{\Upsilon}(4S)$ resonance using $89.3\text{ }\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data sample collected with BABAR detector PEP-II collider. From measured $3\ensuremath{\pi}$ mass spectrum we have obtained products of branching fractions for...
We study the processes e+ e- --> 3(pi+pi-)gamma, 2(pi+pi-pi0)gamma and K+ K- 2(pi+pi-)gamma, with photon radiated from initial state. About 20,000, 33,000 4,000 fully reconstructed events, respectively, have been selected 232 fb-1 of BaBar data. The invariant mass hadronic final state defines effective e+e- center-of-mass energy, so that these data can be compared corresponding direct measurements. From 3(pi+pi-), 2(pi+pi-pi0) 2(pi+pi-) spectra, cross sections for are measured energies...
We study the initial-state-radiation processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ using an integrated luminosity of $232\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected at $\ensuremath{\Upsilon}(4S)$ mass with BABAR...
We observe a new Ds meson with mass (2856.6±1.5stat±5.0syst) MeV/c2 and width (48±7stat±10syst) decaying into D0K+ D+K0S. In the same distributions, we also broad structure (2688±4stat±3syst) (112±7stat±36syst) MeV/c2. To obtain this result, use 240 fb−1 of data recorded by BABAR detector at PEP-II asymmetric-energy e+e− storage rings Stanford Linear Accelerator Center running center-of-mass energies near 10.6 GeV.Received 27 July 2006DOI:https://doi.org/10.1103/PhysRevLett.97.222001©2006...
We study the process $e^+e^-\to\pi^+\pi^-\pi^+\pi^-\gamma$, with a hard photon radiated from initial state. About 60,000 fully reconstructed events have been selected 89 $fb^{-1}$ of BaBar data. The invariant mass hadronic final state defines effective \epem center-of-mass energy, so that these data can be compared corresponding direct $e^+e^-$ measurements. From $4\pi$-mass spectrum, cross section for $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ is measured energies 0.6 to 4.5 $GeV/c^2$. uncertainty in...
We study the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathit{\ensuremath{\Lambda}}\overline{\mathit{\ensuremath{\Lambda}}}\ensuremath{\gamma}$, $\mathit{\ensuremath{\Lambda}}{\overline{\mathit{\ensuremath{\Sigma}}}}^{0}\ensuremath{\gamma}$, ${\mathit{\ensuremath{\Sigma}}}^{0}{\overline{\mathit{\ensuremath{\Sigma}}}}^{0}\ensuremath{\gamma}$ processes using $230\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected by BABAR detector at...
With a sample of approximately 89 x 10(6) B(-)B pairs collected with the BABAR detector, we perform search for B meson decays into charmless vector mesons (phi, rho, and K*). We measure branching fractions, determine degree longitudinal polarization, CP violation asymmetries in processes B+-->phiK(*+), B0-->phiK(*0), B+-->rho(0)K(*+), B+-->rho(0)rho(+). also set an upper limit on fraction decay B0-->rho(0)rho(0).
A search for charmed baryons decaying to D(0)p reveals two states: the Lambdac(2880)+ baryon and a previously unobserved state at mass of [2939.8+/-1.3(stat)+/-1.0(syst)] MeV/c2 with an intrinsic width [17.5+/-5.2(stat)+/-5.9(syst)] MeV. Consistent significant signals are observed K(-)pi(+) K(-)pi(+)pi(-)pi(+) decay modes D0 in 287 fb(-1) annihilation data recorded by BABAR detector center-of-mass energy 10.58 GeV. There is no evidence D+p spectrum doubly charged partners. The relative yield...
We present measurements of branching fractions and CP-violating asymmetries for two-body neutral B meson decays to charged pions kaons based on a sample about 88x10(6) Upsilon(4S)-->BB decays. From time-independent fit we measure the charge-averaged B(B0-->pi+pi-)=(4.7+/-0.6+/-0.2)x10(-6), B(B0-->K+pi-)=(17.9+/-0.9+/-0.7)x10(-6), direct charge asymmetry A(Kpi)=-0.102+/-0.050+/-0.016 [-0.188,-0.016], where ranges in square brackets indicate 90% confidence intervals. time-dependent B0-->pi+pi-...
We study the processes $e^+ e^-\to K^+ K^- \pi^+\pi^-\gamma$, $K^+K^-\pi^0\pi^0\gamma$ and $K^+ K^-\gamma$, where photon is radiated from initial state. About 34600, 4400 2300 fully reconstructed events, respectively, are selected 232 \invfb of \babar data. The invariant mass hadronic final state defines effective \epem center-of-mass energy, so that \pi^+\pi^-\gamma$ data can be compared with direct measurements K^+K^- \pipi$ reaction; no exist for \pi^0\pi^0$ or $\epem\to K^-$ reactions....
A search for charmonium and other new states is performed in a study of exclusive initial-state-radiation production $D\overline{D}$ events from electron-positron annihilations at center-of-mass energy 10.58 GeV. The data sample corresponds to an integrated luminosity $384\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ was recorded by the BABAR experiment PEP-II storage ring. mass spectrum shows clear evidence $\ensuremath{\psi}(3770)$ plus structures near 3.9, 4.1, $4.4\text{...
We present a study of excited charm-strange baryon states produced in $e^+e^-$ annihilations at or near center-of-mass energy $10.58\mathrm{Ge\kern -0.1em V}$, data sample with an integrated luminosity $384 fb^{-1}$ recorded the BABAR detector PEP-II storage rings Stanford Linear Accelerator Center. strong decays baryons to $\Lambda_c^+K^0_{\scriptscriptstyle S}$, $\Lambda_c^+K^-$, $\Lambda_c^+K^-\pi^+$, S}\pi^-$, S}\pi^-\pi^+$, and $\Lambda_c^+K^-\pi^+\pi^-$. This confirms existence...