M. Shapiro
A5014328916- 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
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Advanced Chemical Physics Studies
- Laser-Matter Interactions and Applications
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Medical Imaging Techniques and Applications
- Acute Myeloid Leukemia Research
- Chronic Myeloid Leukemia Treatments
- Atmospheric Ozone and Climate
Lawrence Berkeley National Laboratory
2016-2025
University of California, Berkeley
2015-2024
University College London
2015-2024
Northern Illinois University
2020-2024
Institute of Science and Technology
2023-2024
Institute for High Energy Physics
2023-2024
SR Research (Canada)
2024
Federación Española de Enfermedades Raras
2024
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
If supersymmetry exists at the electroweak scale, then it should be discovered CERN Large Hadron Collider (LHC). Determining masses of supersymmetric particles, however, is more difficult. In this paper, methods are discussed to determine combinations and branching ratios precisely from experimentally observable distributions. many cases such measurements alone can greatly constrain particular model its parameters with an accuracy a few percent. Most results shown correspond one year running...
The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying dielectron or dimuon final states. Results are presented from an analysis of proton-proton (pp) collisions a center-of-mass energy 8 TeV corresponding integrated luminosity 20.3 fb-1 in channel and 20.5 channel. A narrow resonance with Standard Model Z couplings fermions excluded 95% confidence level masses less than 2.79 channel, 2.53 2.90 two channels combined. Limits on other model...
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution have already been profoundly affected by the application existing ...Read More
It is proposed that the two Λ-doublet levels of linear molecules with nonzero electronic orbital angular momentum be labeled Λ(A′) and Λ(A″), e.g., Π(A′) Π(A″) for Π states, etc., according to following prescription: All series in which wave function at high J symmetric reflection spatial coordinates electrons plane rotation will designated all values J, those antisymmetric respect denoted Λ(A″). emphasized this notation meant supplement, not replace, accepted spectroscopic e/f labeling...
Measurements of charged-particle fragmentation functions jets produced in ultra-relativistic nuclear collisions can provide insight into the modification parton showers hot, dense medium created collisions. ATLAS has measured $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb at LHC using a data set recorded 2011 with an integrated luminosity 0.14 nb$^{-1}$. Jets were reconstructed anti-$k_{t}$ algorithm distance parameter values $R$ 0.2, 0.3, and 0.4. Distributions transverse momentum longitudinal fraction...
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
A silicon microstrip vertex detector has been constructed and installed in the Collider Detector at Fermilab. The device designed to operate a hadron collider. It began collecting data May of 1992 functioned within specification. Technical details are presented on all aspects system its performance.
A time dependent theory for radiative recombination induced by strong pulses is presented. Analytic solutions in the adiabatic limit are derived and found to be excellent agreement with exact numerical solutions. Both pump-before-dump “intuitive” dump-before-pump “counter-intuitive” schemes considered. Resonantly enhanced two-photon of ultracold atoms shown an efficient mechanism production molecules. We have performed detailed calculations on cold Na short laser pulses. Our show that, per...
Control over the product branching ratio in photodissociation of N${\mathrm{a}}_{2}$ into $\mathrm{Na}(3s)+\mathrm{Na}(3p)$ and $\mathrm{Na}(3s)+\mathrm{Na}(3d)$ is demonstrated using a two-photon incoherent interference control scenario. Ordinary pulsed nanosecond lasers are used at thermal equilibrium heat pipe. Results show depletion $\mathrm{Na}(3d)$ least 25% concomitant increase $\mathrm{Na}(3p)$ yield as relative frequency two scanned.
Potential energy surfaces for 14 of the M+HX→MX+H reactions, (M=Li,Na,K,Rb; X=F,Cl,Br,I), were generated by a new VB semiempirical method. The dependence barrier location and height on bond angle examined. minimal barriers (=transition states) found to occur in bent configurations X=F reactions collinear, or near-collinear, geometries X=Cl, Br, I reactions. This effect was accompanied shift from exit entrance channel shown arise change effective HX distance at which an electron jump may be...
This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag remove background contaminated events data. Trigger-rate based monitoring beam-related is presented. The correlations with machine conditions, such as residual pressure beam-pipe, are discussed. Results from dedicated beam-background simulations shown, their qualitative agreement data evaluated. Data taken during passage unpaired, i.e. non-colliding, proton bunches used...
Quantum chaos of a single wave function is defined in terms path correlation function, and used to show how sets in, the particle-in-a-stadium problem. The criterion shown be equivalent requirement random distribution wave-function values.
We report measurements of the two-photon processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{K}^{+}{K}^{\ensuremath{-}}$, at an ${e}^{+}{e}^{\ensuremath{-}}$ center-of-mass energy 29 GeV. In ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ data a high-statistics analysis $f(1270)$ results in...
We develop a method of executing complete population transfers between quantum states in piecewise manner using series femtosecond laser pulses. The can be applied to large class problems as it benefits from the high peak powers and spectral bandwidths afforded by degree transfer is robust wide variation absolute relative intensities, durations, time ordering studied detail for atomic sodium where adiabatic transfer, well induction Ramsey-type interferences, demonstrated.
A collinear analytic model for atom–diatom chemical reactions is developed in a systematic fashion from the exact quantum mechanical formulas. All approximations involved were outlined and their range of validity indicated. The products’ vibrational distributions 12 as well isotope effects calculated shown to agree with numerical calculations, experimental results, classical trajectory studies (when available). factors influencing reaction’s outcome analyzed mass extensively explored; two...
Quantum mechanical close coupling calculations on (HF)2 vibrational predissociation are presented. The model considers excitation of the proton donor monomer. other momomer is frozen at its equilibrium position. linewidth (lifetime) and final state rotational distribution initially vibrationally excited HF were calculated using artificial channel method. potential surface was taken from Cournoyer Jorgensen. in good agreement with recent experimental measurements. This result drastically...