39080260
Modified soft annihilation model of anomalous dilepton and photon production and its comparison with data.
The soft annihilation model of the production of anomalous prompt photons and dileptons in multiparticle production processes is modified by the inclusion of a gluon component in the intermediate parton state, improving the agreement with data.
120500696
Optical trigger processor for high energy physics
Abstract We describe a novel incoherent optical processor employing a kinoform filter which is designed to solve a real-time pattern recognition problem in a high energy physics experiment.
121791568
A Study of K+ d Elastic Scattering in the Region of 600-MeV/c to 900-MeV/c
Measurements of the differential cross section for the coherent elastic scattering process ${K}^{+}d\ensuremath{\rightarrow}{K}^{+}d$ are presented at four momenta from 600 MeV/c to 890 MeV/c for $0.03l|t|l0.25$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. Comparisons are made with previous work and with predictions from partial-wave analyses.
11912858
Transputer based data acquisition system for the CMD-2 detector☆
Abstract CMD-2 [1] is currently studying e + e − annihilation in the energy range from 0.36 GeV to 1.4 GeV. The planned upgrade [2] of the VEPP-2M collider facility will increase the luminosity of the machine from 5 × 10 30 cm −2 s −1 up to 2 × 10 31 −10 32 . The expected increase in data rates is beyond the capacity of the operational data acquisition system (DAQ) and necessitates the design of a new system.
118892816
High-statistics measurement of the pion form factor in the rho-meson energy range with the CMD-2 detector
We present a measurement of the pion form factor based on e+e- annihilation data from the CMD-2 detector in the energy range 0.6<sqrt(s)<1.0 GeV with a systematic uncertainty of 0.8%. A data sample is five times larger than that used in our previous measurement.
120840668
Stopping pions in high-energy nuclear cascades.
30927596
Measurement of the W boson mass using electrons at large rapidities
We report a measurement of the W boson mass based on an integrated luminosity of 82 pb(-1) from p&pmacr; collisions at sqrt[s] = 1.8 TeV recorded in 1994-1995 by the D0 detector at the Fermilab Tevatron. We identify W bosons by their decays to enu, where the electron is detected in the forward calorimeters. We extract the mass by fitting the transverse mass and the electron and neutrino transverse momentum spectra of 11 089 W boson candidates. We measure M(W) = 80.691+/-0.227 GeV. By combining this measurement with our previously published central calorimeter results from data taken in 1992-1993 and 1994-1995, we obtain M(W) = 80.482+/-0.091 GeV.
30604611
Existence of proton halos near the drip line.
The proton drip-line nucleus $^{17}\mathrm{Ne}$ is studied in a three-body model of $^{15}\mathrm{O}$ plus two protons. The $^{17}\mathrm{Ne}$ nucleus has a Borromean binding structure, and calculations show a rms matter radius of 2.77\char21{}2.81 fm, in agreement with experiment. The model gives a proton radius excess about 0.26\char21{}0.32 fm over the neutron radius, showing that a proton skin is present. The 73% probability of a valence proton being outside the rms core radius is sufficiently large, however, to indicate a halo. Predictions for the momentum distributions of $^{15}\mathrm{O}$ fragments are given, and these, if verified, would also suggest a two-proton halo structure for $^{17}\mathrm{Ne}$. This would be the first identification of a two-proton halo nucleus.
18221234
Quasielastic scattering of 11Li using realistic three-body wave functions.
The quasielastic scattering of Li from C at 60 MeV/nucleon is calculated in a four-body Glauber approximation. Different Li ground-state wave functions are used, including those calculated using Faddeev three-body models. The calculated quasielastic cross sections, including the 2 and 3 states of C in a distorted wave Born approximation, reproduce the experimental data over most of the angular range, the dHFerences between theoretical models being less than the quoted statistical errors on the available data. PACS number(s): 25.70.Bc, 27.20.+n
119104483
Relativistic MHD winds from rotating neutron stars
Abstract We review here recent numerical results concerning the acceleration and collimation of relativistic outflows from neutron stars, and we discuss their implications for models of magnetars in their hypothesized initial high rotation states. New results with different injection conditions and extending to much larger distance from the central star are also presented and discussed, showing that, only in the case of weakly magnetized winds, collimated outflows are indeed possible. We finally comment on the possibility that newly born magnetars might trigger GRBs, and we show that numerical results do not support such hypothesis.
44554792
Optical model approach for heavy ion fusion.
The differences between optical model (OM) and the barrier transmission approaches for fusion are studied in detail at low energy. In the heavy ion case at deep subbarrier energies, the absorption mean square spin of an optical model calculation using a short ranged imaginary potential differs significantly from the results of the WKB transmission method. This discrepancy of OM results is shown to be due to absorption occurring beyond the barrier position. The coupled reaction channel calculations for fusion based on OM approach are shown to be sensitive to the choice of imaginary fusion potentials, whereas the coupling effects on fusion are dominant for energies only around the barrier. {copyright} {ital 1996 The American Physical Society.}