A5080060848- 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
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Nuclear physics research studies
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Scientific Computing and Data Management
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Stochastic processes and statistical mechanics
University of California, Riverside
2016-2025
Massachusetts Institute of Technology
2022-2025
Imperial College London
2010-2025
Research Complex at Harwell
2025
Institute of High Energy Physics
2015-2024
University of Antwerp
2024
Harbin Institute of Technology
2024
Rutherford Appleton Laboratory
1988-2024
Moscow Institute of Thermal Technology
2024
A. Alikhanyan National Laboratory
2022-2024
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 successful operation of the Large Hadron Collider (LHC) and excellent performance ATLAS, CMS, LHCb ALICE detectors in Run-1 Run-2 with $pp$ collisions at center-of-mass energies 7, 8 13 TeV as well giant leap precision calculations modeling fundamental interactions hadron colliders have allowed an extraordinary breadth physics studies including measurements a variety processes. LHC results so far confirmed validity Standard Model particle up to unprecedented energy scales great sectors...
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 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...
In a search for $B\ensuremath{\rightarrow}c\overline{c}\ensuremath{\gamma}K$ decays with the BABAR detector, where $c\overline{c}$ includes $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$, $K$ ${K}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}_{S}^{0}$, ${K}^{*}(892)$, we find evidence $X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma}$ $X(3872)\ensuremath{\rightarrow}\ensuremath{\psi}(2S)\ensuremath{\gamma}$ $3.6\ensuremath{\sigma}$ $3.5\ensuremath{\sigma}$ significance,...
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...
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 report the results of a search for $Z(4430)^-$ decay to $J/\psi\pi^-$ or $\psi(2S)\pi^-$ in $B^{-,0}\to \jpsi\pi^- K^{0,+}$ and \psitwos \pi^- decays. The data were collected with BABAR detector at SLAC PEP-II asymmetric-energy $e^+e^-$ collider operating center mass energy 10.58 \gev, sample corresponds an integrated luminosity 413 fb$^{-1}$. Each $K\pi$ distribution exhibits clear $K^{\ast}(892)$ $K^{\ast}_2(1430)$ signals, efficiency-corrected spectrum is well-described by...
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 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 ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathit{\ensuremath{\Lambda}}\overline{\mathit{\ensuremath{\Lambda}}}\ensuremath{\gamma}$, $\mathit{\ensuremath{\Lambda}}{\overline{\mathit{\ensuremath{\Sigma}}}}^{0}\ensuremath{\gamma}$, ${\mathit{\ensuremath{\Sigma}}}^{0}{\overline{\mathit{\ensuremath{\Sigma}}}}^{0}\ensuremath{\gamma}$ processes using $230\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected by BABAR detector at...
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...
In a study of ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma}{K}^{+}$ decays, we find evidence for the radiative decay $X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma}$ with statistical significance $3.4\ensuremath{\sigma}$. We measure product branching fractions...
We present evidence for D0-D(0) mixing in D(0)-->K(+)pi(-) decays from 384 fb(-1) of e(+)e(-) colliding-beam data recorded near square root s=10.6 GeV with the BABAR detector at PEP-II storage rings Stanford Linear Accelerator Center. find parameters x('2)=[-0.22+/-0.30(stat)+/-0.21(syst)] x 10(-3) and y(')=[9.7+/-4.4(stat)+/-3.1(syst)] a correlation between them -0.95. This result is inconsistent no-mixing hypothesis significance 3.9 standard deviations. measure R(D), ratio doubly...
We present measurements of the decays B+ -> X(3872) K+ and B0 K0 with Jpsi pi+ pi-. The data sample used, collected BABAR detector at PEP-II e+e- asymmetric-energy storage ring, corresponds to 455 x 10^6 BBbar pairs. Branching fraction BF(B+ K+) BF(X(3872) pi-) = (8.4 +/- 1.5 0.7) 10^{-6} BF(B0 K0) pi- (3.5 1.9 0.4) are obtained. set an upper limit on natural width Gamma < 3.3 MeV/c^2 90% confidence level.
We use a sample of 384×106 B¯¯¯B events collected with the BABAR detector at PEP-II e+e− collider to study angular distributions in rare decays B→K∗ℓ+ℓ−, where ℓ+ℓ− is either or μ+μ−. For low dilepton invariant masses, mℓℓ<2.5 GeV/c2, we measure lepton forward-backward asymmetry AFB=0.24+0.18−0.23±0.05 and K∗ longitudinal polarization FL=0.35±0.16±0.04. mℓℓ>3.2 AFB=0.76+0.52−0.32±0.07 FL=0.71+0.20−0.22±0.04.Received 28 April 2008DOI:https://doi.org/10.1103/PhysRevD.79.031102©2009 American...
We present a measurement of the branching fraction and photon energy spectrum for decay B --> X_s gamma using data from BaBar experiment. The sample corresponds to an integrated luminosity 210 fb^{-1}, which approximately 680 000 BB events are tagged by fully reconstructed hadronic one mesons. In second meson, isolated high--energy is identified. measure BR(B gamma) = (3.66 +- 0.85_{stat} 0.60_{syst}) x 10^{-4} energies E_gamma above 1.9 GeV in rest frame. From measured we calculate first...
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 report e+e−→b¯b cross section measurements by the BABAR experiment performed during an energy scan in range of 10.54 to 11.20 GeV at SLAC PEP-II e+e− collider. A total relative error about 5% is reached more than 300 center-of-mass steps, separated 5 MeV. These can be used derive precise information on parameters Υ(10860) and Υ(11020) resonances. In particular we show that their widths may smaller previously measured.Received 26 September...
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...