V. Savinov
A5091270591- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Distributed and Parallel Computing Systems
- advanced mathematical theories
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Advanced NMR Techniques and Applications
- Radio Astronomy Observations and Technology
- Radioactive Decay and Measurement Techniques
- Algorithms and Data Compression
- Gamma-ray bursts and supernovae
University of Pittsburgh
2015-2024
Chonnam National University
2018-2022
University of the Basque Country
2013-2022
University of Bonn
2022
University of Cincinnati
1999-2020
University of Florida
2000-2020
Duke University
2019-2020
Beihang University
2018-2019
Karlsruhe Institute of Technology
2019
Lomonosov Moscow State University
2018
Using 13.5 ${\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to ${D}_{s}^{*+}{\ensuremath{\pi}}^{0}$ mass near $2.46\mathrm{GeV}{/c}^{2}.$ The search for such state was motivated by recent discovery BaBar Collaboration at $2.32\mathrm{GeV}{/c}^{2},$ ${D}_{\mathrm{sJ}}^{*}{(2317)}^{+},$ that decays ${D}_{s}^{+}{\ensuremath{\pi}}^{0}.$ Reconstructing...
We have observed the decays ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{0}$\ensuremath{\gamma} and ${\mathit{B}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}, which are evidence for quark-level process b\ensuremath{\rightarrow}s\ensuremath{\gamma}. The average branching fraction is...
We present the first measurement of D*+ width using 9/fb e+ e- data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size CESR beam spot to measure energy release distribution from -> D0 pi+ decay. find Gamma(D*+) = 96 +- 4 (Statistical) 22 (Systematic) keV. also in decay compute Delta m m(D*+) - m(D0) 145.412 0.002 0.012 MeV/c^2
We report on a study of the invariant mass spectrum hadronic system in decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}.$ This was performed with data obtained CLEO II detector operating at CESR ${e}^{+}{e}^{\ensuremath{-}}$ collider. present fits to phenomenological models which resonance parameters associated $\ensuremath{\rho}(770)$ and $\ensuremath{\rho}(1450)$ mesons are...
Using $20.7\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data taken at $\sqrt{s}=3.671\text{ }\mathrm{GeV}$ with the $\mathrm{CLEO}\mathrm{\text{\ensuremath{-}}}c$ detector, precision measurements electromagnetic form factors charged pion, kaon, and proton have been made for timelike momentum transfer $|{Q}^{2}|=13.48\text{ }{\mathrm{GeV}}^{2}$ by reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{+}{h}^{\ensuremath{-}}$. The...
Using $281\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at the $\ensuremath{\psi}(3770)$ resonance with CLEO-c detector CESR (Cornell Electron Storage Ring), we determine absolute hadronic branching fractions charged and neutral $D$ mesons using a double tag technique. Among measurements for three ${D}^{0}$ six ${D}^{+}$ modes, obtain reference...
Using 13.5 inverse fb of e+e- annihilation data collected with the CLEO II detector we have observed a narrow resonance in Ds*+pi0 final state, mass near 2.46 GeV. The search for such state was motivated by recent discovery BaBar Collaboration at 2.32 GeV, DsJ*(2317)+ that decays to Ds+pi0. Reconstructing Ds+pi0 and states data, observe peaks both corresponding reconstructed difference distributions, dM(Dspi0)=M(Dspi0)-M(Ds) dM(Ds*pi0)=M(Ds*pi0)-M(Ds*), them values 350 MeV. We interpret...
Using the CLEO-c detector at Cornell Electron Storage Ring, we have measured inclusive and exclusive cross sections for production of D+, D0 Ds+ mesons in e+e- annihilations thirteen center-of-mass energies between 3.97 4.26 GeV. Exclusive are presented final states consisting two charm (DD, D*D, D*D*, Ds+Ds-, Ds*+Ds-, Ds*+Ds*-) processes which charm-meson pair is accompanied by a pion. No enhancement any state observed energy Y(4260).
We measure the branching ratio of purely leptonic decay D+ meson with unprecedented precision as B(D+ -> mu+ nu) = (3.82 +/- 0.32 0.09)x10^(-4), using 818/pb data taken on psi(3770) resonance CLEO-c detector at CESR collider. use this determination to derive a value for pseudoscalar constant fD+, combining measurements lifetime and assuming |Vcd| |Vus|. find fD+ (205.8 8.5 2.5) MeV. The rate asymmetry [B(D+ nu)-B(D- mu- nu)]/[B(D+ nu)+B(D- nu)] 0.08 0.08, consistent no CP violation. also set...
We present the first measurement of D*(+) width using 9/fb e(+)e(-) data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size Cornell Electron-positron Storage Ring beam spot to measure energy release distribution from D*(+)-->D(0)pi(+) decay. find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. also in decay compute Delta m identical with m(D*(+))-m(D(0)) 145.412+/-0.002...
CLEO has studied B decays to πℓν, ρℓν, and ωℓν, where ℓ=eorμ, by incorporating the missing momentum into full reconstruction. With B0 B+ modes combined according isospin predictions for relative partial widths, we obtain B(B0→π−ℓ+ν)=(1.8±0.4±0.3±0.2)×10−4 B(B0→ρ−ℓ+ν)=(2.5±0.4+0.5−0.7±0.5)×10−4, errors are statistical, systematic, estimated model dependence. We also estimate |Vub|=(3.3±0.2+0.3−0.4±0.7)×10−3.Received 1 July 1996DOI:https://doi.org/10.1103/PhysRevLett.77.5000©1996 American...
In e(+)e(-) collisions using the CLEO detector, we have studied decay of D0 to final state K(0)(S)pi(+)pi(-) with initial flavor tagged by D(*+)-->D0pi(+). We use Dalitz technique measure resonant substructure in this and clearly observe ten different contributions fitting for their amplitudes relative phases. a K(*)(892)(+)pi(-) component which arises from doubly Cabibbo suppressed decays or D0-D0; mixing.
The h(c)((1)P(1)) state of charmonium has been observed in the reaction psi(2S) --> pi(0)h(c) (gammagamma)(gammaeta(c)) using 3.08 x10(6) decays recorded CLEO detector. Data have analyzed both for inclusive reaction, where decay products eta(c) are not identified, and exclusive reactions, which reconstructed seven hadronic channels. We find M(h(c)) = 3524.4 +/- 0.6 0.4 MeV corresponds to a hyperfine splitting DeltaM(hf)(1P) triple-bond <M((3)P(J)) - M((1)P(1)) +1.0 MeV, B(psi(2S) pi(0)h(c))...
We report on the observation of ηc′(2S01), radial excitation ηc(1S01) ground state charmonium, in two-photon fusion reaction γγ→ηc′→KS0K±π∓ 13.6 fb−1 CLEO II/II.V data and 13.1 III data. obtain M(ηc′)=3642.9±3.1(stat)±1.5(syst) MeV M(ηc)=2981.8±1.3(stat)±1.5(syst) MeV. The corresponding values hyperfine splittings between S01 S13 states are ΔMhf(1S)=115.1±2.0 ΔMhf(2S)=43.1±3.4 Assuming that ηc ηc′ have equal branching fractions to KSKπ, we Γγγ(ηc′)=1.3±0.6 keV.Received 23 December...
Using 2.45x10;{7} psi(2S) decays collected with the CLEO-c detector at Cornell Electron Storage Ring we present most precise measurements of magnetic dipole transitions in charmonium system. We measure B(psi(2S)-->gammaeta_{c})=(4.32+/-0.16+/-0.60)x10;{-3}, B(J/psi-->gammaeta_{c})/B(psi(2S)-->gammaeta_{c})=4.59+/-0.23+/-0.64, and B(J/psi-->gammaeta_{c})=(1.98+/-0.09+/-0.30)%. observe a distortion eta_{c} line shape due to photon-energy dependence transition rate. find that mass are sensitive...
We search for a non-SM-like CP-odd Higgs boson (a(1)(0)) decaying to tau(+)tau(-) or mu(+)mu(-) in radiative decays of the Upsilon(1S). No significant signal is found, and upper limits on product branching ratios are set. Our results almost 2 orders magnitude more stringent than previous limits. data provide no evidence state with mass 214 MeV mu(+)mu(-), previously proposed as an explanation 3 Sigma(+)-->pmu(+)mu(-) events observed by HyperCP experiment. constrain NMSSM models.
The dark photon ${A}^{\ensuremath{'}}$ and the Higgs boson ${h}^{\ensuremath{'}}$ are hypothetical constituents featured in a number of recently proposed sector models. Assuming prompt decays both particles, we search for their production so-called Higgstrahlung channel ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{A}^{\ensuremath{'}}{h}^{\ensuremath{'}}$, with ${h}^{\ensuremath{'}}\ensuremath{\rightarrow}{A}^{\ensuremath{'}}{A}^{\ensuremath{'}}$. We investigate ten exclusive final...
In a sample of 19 million produced B mesons, we have observed the decays -> eta K* and improved our previous measurements eta'K. The branching fractions measure for these decay modes are BR(B+ K*+) = (26.4 +9.6-8.2 +- 3.3) x $10^{-6}$, BR(B0 K*0) (13.8 +5.5-4.6 1.6) eta' K+) (80 +10-9 7) $10^{-6}$ K0) (89 +18-16 9) $10^{-6}$. We searched with comparable sensitivity related report upper limits fractions.
Using data collected by the CLEO II detector, we have observed two states decaying to ${\ensuremath{\Lambda}}_{c}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. Relative ${\ensuremath{\Lambda}}_{c}^{+}$, their mass splittings are measured be $+307.5\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}1.0$ and $+342.2\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.5\mathrm{MeV}{/c}^{2}$, respectively; this represents first measurement of less massive state....
We report results of searches for charmless hadronic B meson decays to pseudoscalar( pi(+/-), K+/-, pi(0), or K(0)(S))-vector( rho, K(*), omega) final states. By using 9.7x10(6) BB pairs collected with the CLEO detector, we first observation B(-)--->pi(-)rho(0), B(0)-->pi(+/-)rho(-/+), and B(-)-->pi(-)omega, which are expected be dominated by b-->u transitions. The measured branching fractions (10.4(+3.3)(-3.4)+/-2.1)x10(-6), (27.6(+8.4)(-7.4)+/-4.2)x10(-6), (11.3(+3.3)(-2.9)+/-1. 4)x10(-6),...
We search for CP-violating charge asymmetries (alpha(CP)) in the B meson decays to K(+/-)pi(-/+), K(+/-)pi(0), K(0)(S)pi(+/-), K(+/-)eta('), and omega pi(+/-). Using 9.66 million upsilon(4S) collected with CLEO detector, statistical precision on alpha(CP) is range of +/-0.12 +/-0.25 depending decay mode. While up +/-0.5 are possible within standard model, measured consistent zero all five modes studied.
We observe signals for the decays ψ(3770)→XJ/ψ from data acquired with CLEO detector operating at CESR e+e− collider √s=3773 MeV. measure following branching fractions B(ψ(3770)→XJ/ψ) and significances: (189±20±20)×10−5 (11.6σ) X=π+π−, (80±25±16)×10−5 (3.4σ) X=π0π0, (87±33±22)×10−5 (3.5σ) X=η, where errors are statistical systematic, respectively. The radiative return process e+e−→γψ(2S) populates same event sample is used to Γee[ψ(2S)]=(2.54±0.03±0.11) keV.Received 9 August...
The ATLAS detector has been designed for operation at CERN's Large Hadron Collider. includes a complex system of liquid argon calorimeters. This paper describes the architecture and implementation custom front end electronics developed readout
We have studied charmless hadronic decays of $B$ mesons into two-body final states with kaons and pions observe three new processes the following branching fractions: $B(B\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({4.3}_{\ensuremath{-}1.4}^{+1.6}\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$,...
We report on determinations of |Vub| resulting from studies the branching fraction and q^2 distributions in exclusive semileptonic B decays that proceed via b->u transition. Our data set consists 9.7x10^6 BBbar meson pairs collected at Y(4S) resonance with CLEO II detector. measure B(B0 -> pi- l+ nu) = (1.33 +- 0.18 0.11 0.01 0.07)x10^{-4} rho- (2.17 0.34 +0.47/-0.54 0.41 0.01)x10^{-4}, where errors are statistical, experimental systematic, systematic due to residual form-factor...