A5101957666- 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
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Misinformation and Its Impacts
- Radio Frequency Integrated Circuit Design
- Muon and positron interactions and applications
- Scientific Research and Discoveries
Yunnan Observatories
2025
Chinese Academy of Sciences
2025
Nanjing University
2010-2024
Washington University in St. Louis
2024
Sun Yat-sen University
2024
Southern Methodist University
2013-2023
Beijing Shijingshan Hospital
2023
West University of Timişoara
2019
The University of Adelaide
2016
University of Science and Technology of China
2011-2015
We report a new measurement of the CKM parameter V_ub made with sample 9.7 million B B-bar events collected CLEO II detector. Using Heavy Quark theory, we combine observed yield leptons from semileptonic decay in end-point momentum interval 2.2-2.6 GeV/c recent data on --> X_s gamma to find |V_ub| = (4.08 +/- 0.34 0.44 0.16 0.24) x 10^-3, where first two uncertainties are experimental and last theory.
The resonant structure of the four pion final state in decay →τ3ππ0ντ has been analyzed using 4.27 million τ+τ− pairs collected by CLEO II experiment at Cornell Electron Storage Ring. A partial wave analysis performed; spectral decomposition system is dominated ωπ and a1π states. mass width ρ′ resonance have extracted from a fit to →τωπντ function. We searched for second class currents spin-parity established an upper limit on non-vector current contribution.Received 30 September...
In a sample of $9.66\times 10^6 B\bar{B}$ pairs collected with the CLEO detector we make first observation B decays to an $\eta_c$ and kaon. We measure branching fractions $BR(B^+\to\eta_c K^+) = (0.69 + 0.26 - 0.21 +- 0.08 0.20)\times 10^{-3}$ $BR(B^0\to\eta_c K^0) (1.09 0.55 0.42 0.12 0.31)\times 10^{-3}$, where error is statistical, second systematic third from fraction uncertainty. From these extract decay constant in factorization approximation, $f_{\eta_c} 335 75$ MeV. also search for...
We describe several measurements using the decays D0→K+K− and π+π−. find ratio of partial widths, Γ(D0→K+K−)/Γ(D0→π+π−), to be 2.96±0.16±0.15, where first error is statistical second systematic. observe no evidence for direct CP violation, obtaining ACP(KK)=(0.0±2.2±0.8)% ACP(ππ)=(1.9±3.2±0.8)%. In limit violation we measure mixing parameter yCP=−0.012±0.025±0.014 by measuring lifetime difference between or π+π− neutral state, D0→K−π+. see mixing.Received 6 November...
We have studied two-body charmless hadronic decays of B mesons into the final states straight phiK and phiK(*). Using 9.7 million B&Bmacr; pairs collected with CLEO II detector, we observe B- --> phiK- B0--> phiK(*0) following branching fractions: B(B--->phiK-) = (5.5(+2.1)(-1.8)+/-0.6)x10(-6) B(B0--> phiK(*0)) (11.5(+4.5+1.8)(-3.7-1.7))x10(-6). also see evidence for B0-->phiK0 B---> phiK(*-). However, since statistical significance is not overwhelming these modes, determine upper limits...
From electron-positron collision data collected with the CLEO detector operating at Cornell Electron Storage Ring near sqrt[s]=10.6 GeV, improved measurements of branching fractions for tau decays into three explicitly identified hadrons and a neutrino are presented as B(tau(-)-->pi(-)pi(+)pi(-)nu(tau))=(9.13+/-0.05+/-0.46)%, B(tau(-)-->K-pi(+)pi(-)nu(tau))=(3.84+/-0.14+/-0.38) x 10(-3), B(tau(-)-->K-K+pi(-)nu(tau))=(1.55+/-0.06+/-0.09) B(tau(-)-->K-K+K-nu(tau))<3.7 10(-5) 90% C.L., where...
We have searched for $\mathrm{CP}$-violating asymmetries in neutral charm meson decays 13.7 ${\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data at $\sqrt{s}\ensuremath{\approx}10.6 \mathrm{GeV}$ with the CLEO detector. The measured rate ${D}^{0}$ and $\overline{{D}^{0}}$ to ${K}_{S}^{0}{\ensuremath{\pi}}^{0},$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ ${K}_{S}^{0}{K}_{S}^{0}$ final states are $(+0.1\ifmmode\pm\else\textpm\fi{}1.3)%,$...
We revisit the contribution to strong <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> parameter <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mover accent="true"><c:mi>θ</c:mi><c:mo stretchy="false">¯</c:mo></c:mover></c:math> from leptonic <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi>C</g:mi><g:mi>P</g:mi></g:math> violation at one-loop level in minimal left-right symmetric...
We search and find no evidence for CP violation in tau decays into the K(pi)nu(tau) final state. provide limits on imaginary part of coupling constant Lambda describing a relative contribution violating processes with respect to standard model be -0.172<Im(Lambda)<0.067 at 90% C.L.
We report on a search for CP violation in the decay of D0 and ¯¯¯D0 to K0Sπ+π−. The data come from an integrated luminosity 9.0 fb−1 e+e− collisions at √s≈10 GeV recorded with CLEO II.V detector. resonance substructure this is well described by ten quasi-two-body channels plus small nonresonant component. observe no evidence amplitudes that describe D0→K0Sπ+π−.Received 12 November 2003DOI:https://doi.org/10.1103/PhysRevD.70.091101©2004 American Physical Society
We present ASIC designs of VCSEL drivers for a single (LOCld1), two individual VCSELs (LOCld2) and four-channel array (LOCld4). This work is new detector readout systems needed in the Large Hadron Collider upgrade program. All ASICs are fabricated commercial 0.25-μ m Silicon-on-Sapphire CMOS technology. LOCld1 LOCld2 have passed 8-Gbps 10-Gbps eye mask tests. Operating at 8 Gbps data rate, measured total jitter less than 30 ps, power comsuption about 200 mW per channel with 6-mA bias current...
We report the development of a mid-board, TOSA and ROSA based miniature dual channel optical transmitter (MTx) transceiver (MTRx). The design transmission data rate is 5.12 Gbps per receiving 4.8 Gbps. MTx MTRx are only 6 mm tall electrically optically pluggable. Although fiber TOSA/ROSA coupling through custom latch, uses standard LC ferrule, flange spring. with mechanism ensure light efficiency. With serializer LOCx2 sits under MTx, one achieves high small PCB footprint, enjoys reliability...
We have searched for rare and forbidden decays of the eta(') meson in hadronic events at CLEO II detector. The search is conducted on 4.80 fb(-1) e(+)e(-) collisions 10.6 GeV center-of-mass energy Cornell Electron Storage Ring. find no signals, set 90% confidence level upper limits their branching fractions: B(eta(')-->e(+)e(-)eta)<2.4x10(-3), B(eta(')-->e(+)e(-)pi(0))<1. 4x10(-3), B(eta(')-->e(+)e(-)gamma)<0.9x10(-3), B(eta(')-->e&mgr;)<4.7x10(-4). also fit matrix element...
In the standard model, charged current of weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement Cabibbo-Kobayashi-Maskawa (CKM) elements essential searches for new physics, either through structure CKM matrix, or departure from unitarity. We determine element |Vcb| using sample 3×106 BB¯ events in CLEO detector at Cornell Electron Storage Ring. yield reconstructed B0→D*+lν¯ and B−→D*0lν¯ decays as function w, boost D* B rest frame, this we...
We have searched a sample of 9.6 million $B\overline{B}$ events for the lepton-flavor-violating decays $\stackrel{\ensuremath{\rightarrow}}{B}{\mathrm{he}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}},$ ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{e}^{+}{e}^{+},$ ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{e}^{+}{\ensuremath{\mu}}^{+},$ and ${B}^{+}\ensuremath{\rightarrow}{h}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{+},$ where h is...
We present an observation and time-integrated rate measurement of the decay ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ produced in $9{\mathrm{fb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ collisions near $\ensuremath{\Upsilon}(4S)$ resonance. The signal is inconsistent with upward fluctuation background by 4.9 standard deviations. measured normalized to...
We have searched for the two-body decay of B meson to a light pseudoscalar h = pi(+/-),K+/-,K(0)(S) and massless neutral feebly interacting particle X(0) such as familon, Nambu-Goldstone boson associated with spontaneously broken global family symmetry. find no significant signal by analyzing data sample containing 9.7x10(6) BBbar mesons collected CLEO detector at Cornell Electron Storage Ring, set 90% C.L. upper limits italicB(B(+/-) --> h(+/-)X(0)) 4.9x10(-5) italicB(B(0) K(0)(S)X(0))...
We have measured the charge asymmetry in like-sign dilepton yields from B(0)B*(0) meson decays using CLEO detector at Cornell Electron Storage Ring. find a(0)(ll) identical with[N(l(+)l(+))-N(l(-)l(-))]/[N(l(+)l(+))+N(l(-)l(-))] = +0.013+/-0.050+/-0.005. combine this result with a previous, independent measurement and obtain Re(epsilon(B))/(1+ absolute value of epsilon(B)(2)) +0.0035+/-0.0103+/-0.0015 (uncertainties are statistical systematic, respectively) for CP impurity parameter, epsilon(B).
Using a sample of 4.7 ${\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity accumulated with the CLEO II detector at Cornell Electron Storage Ring (CESR), we investigate mass spectrum and resonant structure in ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ decays. We measure relative fractions ${K}_{1}(1270)$ ${K}_{1}(1400)$ resonances these decays, as well...
We determine the weak coupling /V(cb)/ between b and c quarks using a sample of 3 x 10(6) BB; events in CLEO detector at Cornell Electron Storage Ring. yield reconstructed B-->D*l nu; decays as function w, boost D* B rest frame, from this we obtain differential decay rate d Gamma/dw. By extrapolating Gamma/dw to w=1, kinematic end point which is relative B, extract product /V(cb)/F(1), where F(1) form factor w=1. Combined with theoretical results for...
Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, we observed two-photon production cc states chi(c0) and chi(c2) in their decay to pi(+)pi(-)pi(+)pi(-). We measured gamma(gammagamma)(chi(c))xB(chi(c)-->pi(+)pi(-)pi(+)pi(-)) be 75+/-13(stat)+/-8(syst) eV for 6.4+/-1.8(stat)+/-0.8(syst) chi(c2), implying gamma(gammagamma)(chi(c0)) = 3.76+/-0.65(stat)+/-0.41(syst)+/-1.69(br) keV gamma(gammagamma)(chi(c2)) 0.53+/-0.15(stat)+/-0.06(syst)+/-0.22(br) keV. Also, cancellation...
Using 9.1 fb-1 of e+ e- data collected at the Upsilon(4S) with CLEO detector using Cornell Electron Storage Ring, measurements are reported for both branching fractions and helicity amplitudes decays B- -> D*0 rho- B0bar D*+ rho-. The fraction longitudinal polarization in is found to be consistent that l- nubar q^2 = M^2_rho, indicating factorization approximation works well. mode similar. also show evidence non-trivial final-state interaction phases amplitudes.
Using the CLEO detector at Cornell Electron Storage Ring, we have observed Omega_c (css ground state) in decay -> Omega- e+ nu. We find a signal of 11.4 +- 3.8 (stat) events. The probability that background fluctuation is 7.6 x 10-5. measure BF(Omega_c nu) sigma(e+ e- X) = (42.2 14.1 5.7 (syst)) fb and R Gamma(Omega_c pi+)/Gamma(Omega_c 0.41 0.19 0.04 (syst). This first statistically significant observation an individual mode annhiliation, example baryon decaying via beta-emmision, where no...