A5107836639- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Nuclear physics research studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Muon and positron interactions and applications
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
Salisbury University
2024
Argonne National Laboratory
2010-2023
University of Manchester
2005-2020
Ludwig-Maximilians-Universität München
2011-2012
European Organization for Nuclear Research
2012
National Science and Technology Council
2011
Turkish Atomic Energy Authority
2011
Leverhulme Trust
2011
Royal Society
2011
Istituto Nazionale di Fisica Nucleare, Centro Nazionale Analisi Fotogrammi
2011
We have observed a narrow state near 2.32 GeV/c2 in the inclusive D+sπ0 invariant mass distribution from e+e− annihilation data at energies 10.6 GeV. The width is consistent with experimental resolution. small intrinsic and quantum numbers of final indicate that decay violates isospin conservation. has natural spin-parity low suggests JP=0+ assignment. sample corresponds to an integrated luminosity 91 fb−1 recorded by BABAR detector SLAC PEP-II asymmetric-energy storage ring.Received 11...
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 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...
The GridPP Collaboration is building a UK computing Grid for particle physics, as part of the international effort towards Large Hadron Collider. project, funded by Particle Physics and Astronomy Research Council (PPARC), began in September 2001 completed its first phase 3 years later. collaboration approximately 100 researchers 19 university physics groups, Central Laboratory Councils CERN, reflecting strategic importance project. In with other European US efforts, project demonstrated...
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 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 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...
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 the nonconservation of lepton flavor number in decay τ±→μ±γ has been performed using 2.07×108 e+e−→τ+τ− events produced at a center-of-mass energy near 10.58 GeV with BABAR detector PEP-II storage ring. We find no evidence signal and set an upper limit on branching ratio B(τ±→μ±γ)<6.8×10−8 90% confidence level.Received 16 February 2005DOI:https://doi.org/10.1103/PhysRevLett.95.041802©2005 American Physical Society
The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For calorimeter, current baseline choice a granularity sampling calorimeter with tungsten as absorber silicon detectors sensitive material. A ``physics prototype'' has been constructed, consisting thirty layers. Each layer an active area 18 × cm2 pad size 1 cm2. thickness totals 24 radiation lengths. It exposed in 2006 2007 to...
A narrow state, which we label DsJ(2458)+, with a mass 2458.0±1.0(stat)±1.0(syst)MeV/c2, is observed in the inclusive D+sπ0γ distribution 91fb−1 of e+e− annihilation data recorded by BABAR detector at SLAC PEP-II asymmetric-energy storage ring. The width consistent experimental resolution. favor decay through D*s(2112)+π0 rather than D*sJ(2317)+γ. An analysis D+sπ0 accounting for influence DsJ(2458)+ produces D*sJ(2317)+ 2317.3±0.4(stat)±0.8(syst)MeV/c2. Received 24 October...
We present results on time-dependent CP asymmetries in neutral B decays to several eigenstates. The measurements use a data sample of about 227 x 10(6) upsilon(4S) --> BB collected by the BABAR detector at PEP-II asymmetric-energy Factory SLAC. amplitude CPasymmetry, sin2beta standard model, is derived from decay-time distributions events which one meson fully reconstructed final state containing charmonium and other determined be either B0 or its decay products. measure = 0.722 +/-...
We search for a charged partner of the $X(3872)$ in decay $B\ensuremath{\rightarrow}{X}^{\ensuremath{-}}K$, ${X}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, using $234\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $\ensuremath{\Upsilon}(4S)$ resonance with BABAR detector PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring. The resulting product branching fraction upper...
The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(c) meson have been measured in two-photon interactions at SLAC e(+)e(-) asymmetric B Factory with BABAR detector. With a sample approximately 2500 reconstructed eta(c)-->K(0)(S)K+/-pi(-/+) decays 88 fb(-1) data, results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) Gamma(eta(c))(tot)=34.3+/-2.3(stat)+/-0.9(syst) MeV/c(2). Using same decay mode, second resonance 112+/-24 events is observed 3630.8+/-3.4(stat)+/-1.0(syst)...
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....
With a sample of 232x10^6 Upsilon(4S) --> BBbar events collected with the BaBar detector, we study decay B+ p pbar K+ excluding charmonium decays to ppbar. We measure branching fraction Br(B+ K+)=(6.7+/-0.5+/-0.4)x10^{-6}. An enhancement at low ppbar mass is observed and Dalitz plot asymmetry suggests dominance penguin amplitude in this B decay. search for pentaquark candidate Theta*++ decaying into pK+ range 1.43 2.00 GeV/c2 set limits on Theta*++pbar)xBr(Theta*++ pK+) 10^{-7} level.
We present results on $B\ensuremath{\rightarrow}J/\ensuremath{\psi}K\ensuremath{\pi}$ decays using ${e}^{+}{e}^{\ensuremath{-}}$annihilation data collected with the BABAR detector at $\ensuremath{\Upsilon}(4S)$ resonance. The is located PEP-II asymmetric-energy storage ring facility Stanford Linear Accelerator Center. Using approximately $88\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs, we measure decay amplitudes for flavor eigenmodes and observe strong-phase differences...
We report on a measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase γ through Dalitz analysis neutral D decays to KS0π−π+ in processes B∓→D(*)K∓, D*→Dπ0, Dγ. Using sample 227×106 BB¯ pairs collected by BABAR detector, we measure amplitude ratios rB=0.12±0.08±0.03±0.04 and rB*=0.17±0.10±0.03±0.03, relative strong phases δB=(104±45−21−24+17+16)° δB*=(−64±41−12+14±15)° between amplitudes A(B−→D¯(*)0K−) A(B−→D(*)0K−), γ=(70±31−10−11+12+14)°. The first error is statistical, second...
The branching fractions of the decays B0→K*0γ and B+→K*+γ are measured using a sample 88×106BB¯ events collected with BABAR detector at PEP-II asymmetric-energy e+e− collider. We find B(B0→K*0γ)=[3.92±0.20(stat)±0.24(syst)]×10−5, B(B+→K*+γ)=[3.87±0.28(stat)±0.26(syst)]×10−5. Our measurements also constrain direct CP asymmetry to be −0.074<A(B→K*γ)<0.049 isospin −0.046<Δ0−<0.146, both 90% confidence level.Received 30 June 2004DOI:https://doi.org/10.1103/PhysRevD.70.112006©2004 American...
We report a measurement of the inclusive electron energy spectrum for semileptonic decays B mesons in data sample 52 million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ collected with BABAR detector at PEP-II asymmetric-energy B-meson factory SLAC. determine branching fraction, first, second, and third moments lower cutoffs on between 0.6 1.5 GeV. measure partial fraction to be...
A search for the lepton-flavor-violating decay of tau into three charged leptons has been performed using 91.5 fb−1 data collected at an e+e−center-of-mass energy around 10.58 GeV with BABAR detector SLAC storage ring PEP-II. In all six modes considered, numbers events found in are compatible background expectations. Upper limits on branching fractions set range (1–3)×10−7 90% confidence level.Received 8 December 2003DOI:https://doi.org/10.1103/PhysRevLett.92.121801©2004 American Physical Society
In 2008, Michigan State University was selected to establish the Facility for Rare Isotope Beams (FRIB). Construction of FRIB accelerator completed in January 2022. Phased commissioning with heavy ion beams started 2017 normal-conducting source and radio-frequency quadrupole. April 2021, full driver linear (linac) commissioned, accelerated energies above 200 MeV/nucleon by 324 superconducting radiofrequency (SRF) resonators operating at 2 K 4 liquid-helium cooling. preparation high-power...
Fusion and quasielastic excitation functions were measured for ${}^{40}\mathrm{Ca}{+}^{46,48,50}\mathrm{Ti}$ at energies close to the Coulomb barrier. The interest in these systems lies opposite target-mass dependence of surface vibration couplings neutron-transfer couplings. cross sections small energy steps with high precision, so that structure (barrier distributions) could be revealed through a differentiation process. subbarrier fusion data show larger enhancement increasing target mass...