12,514 research outputs found
Classification of -Wave and Systems
An exotic meson, the with , has been seen to
decay into a p-wave system. If this decay conserves flavor SU(3),
then it can be shown that this exotic meson must be a four-quark state () belonging to a flavor representation
of SU(3). In contrast, the with a substantial decay mode into
is likely to be a member of a flavor octet.Comment: 8 page
Non-monotonic temperature dependent transport in graphene grown by Chemical Vapor Deposition
Temperature-dependent resistivity of graphene grown by chemical vapor
deposition (CVD) is investigated. We observe in low mobility CVD graphene
device a strong insulating behavior at low temperatures and a metallic behavior
at high temperatures manifesting a non-monotonic in the temperature dependent
resistivity.This feature is strongly affected by carrier density modulation. To
understand this anomalous temperature dependence, we introduce thermal
activation of charge carriers in electron-hole puddles induced by randomly
distributed charged impurities. Observed temperature evolution of resistivity
is then understood from the competition among thermal activation of charge
carriers, temperature-dependent screening and phonon scattering effects. Our
results imply that the transport property of transferred CVD-grown graphene is
strongly influenced by the details of the environmentComment: 7 pages, 3 figure
Controlling internal barrier in low loss BaTiO3 supercapacitors
Supercapacitor behavior has been reported in a number of oxides including reduced BaTiO3 ferroelectric ceramics. These so-called giant properties are however not easily controlled. We show here that the continuous coating of individual BaTiO3 grains by a silica shell in combination with spark plasma sintering is a way to process bulk composites having supercapacitor features with low dielectric losses and temperature stability. The silica shell acts both as an oxidation barrier during the processing and as a dielectric barrier in the final composite
Theory of superconductor-insulator transition in single Josephson junctions
A non-band theory is developed to describe the superconductor-insulator (SI)
transtition in resistively shunted, single Josephson junctions. The
characteristic is formulated by a Landauer-like formula and evaluated by the
path-integral transfer-matrix method. The result is consistent with the recent
experiments at around 80 . However, the insulator phase shrinks with
decreasing temperature indicating that the single Josephson junction becomes
all superconducting at absolute zero temperature, as long as dissipation is
present.Comment: 4 pages, 3 figure
Model Dependence of the Properties of S11 Baryon Resonances
The properties of baryon resonances are extracted from a complicated process
of fitting sophisticated, empirical models to data. The reliability of this
process comes from the quality of data and the robustness of the models
employed. With the large of amount of data coming from recent experiments, this
is an excellent time for a study of the model dependence of this extraction
process. A test case is chosen where many theoretical details of the model are
required, the S11 partial wave. The properties of the two lowest N* resonances
in this partial wave are determined using various models of the resonant and
non-resonant amplitudes.Comment: 24 pages, 10 figures; revised fits with error estimates, expanded
comparison between CMB and K-matrix model
Prioritization of water management under climate change and urbanization using multi-criteria decision making methods
This paper quantifies the transformed effectiveness of alternatives for watershed management caused by climate change and urbanization and prioritizes five options using multi-criteria decision making techniques. The climate change scenarios (A1B and A2) were obtained by using a statistical downscaling model (SDSM), and the urbanization scenario by surveying the existing urban planning. The flow and biochemical oxygen demand (BOD) concentration duration curves were derived, and the numbers of days required to satisfy the environmental flow requirement and the target BOD concentration were counted using the Hydrological Simulation Program-Fortran (HSPF) model. In addition, five feasible alternatives were prioritized by using multi-criteria decision making techniques, based on the driving force-pressure-state-impact-response (DPSIR) framework and cost component. Finally, a sensitivity analysis approach for MCDM methods was conducted to reduce the uncertainty of weights. The result indicates that the most sensitive decision criterion is cost, followed by criteria response, driving force, impact, state and pressure in that order. As it is certain that the importance of cost component is over 0.127, construction of a small wastewater treatment plant will be the most preferred alternative in this application
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Two recent charm search experiments with the multiparticle spectrometer at BNL
Two recent experiments at the BNL Multiparticle Spectrometer searched for charm production in the ..pi../sup -/p interactions at 16 and 17 GeV/c. One experiment looked for D/sup *//sup -/ production with a fast K/sup +/ trigger, while the other experiment triggered on single-electron events. The K/sup +/-trigger experiment finds that the D/sup *//sup -/ cross-section at 16 GeV/c is less than 130 nb at 95% confidence level
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Glueball candidates
Glueball candidates are reviewed. So far, candidates have been reported in J/sup PC/ = O/sup + +/, 2/sup + +/ and O/sup - +/ but none in the exotic J/sup PC/ such as 1/sup - +/. 27 references
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A program of quark-gluon' spectroscopy at BNL
The current status and future prospects are given of the quark-gluon spectroscopy, and a multi-year experimental program at BNL is described, consisting of experiments E771, E818 and E852, which address the question of missing quarkonia in the SU(3) family of mesons and the existence of exotic hadrons with gluonic degrees of freedom. 23 refs., 8 figs., 8 tabs
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Hadron spectroscopy at RHIC and KAON
A description is given of the physics opportunities at RHIC regarding quark-gluon spectroscopy. The basic idea is to isolate with appropriate triggers the sub-processes pomeron + pomeron {yields} hadrons and {gamma}{sup +}+{gamma}{sup +} {yields} hadrons with the net effective mass of hadrons in the range of 1.0 to 10.0 GeV, in order to study the hadronic states composed of u, d, c, b and gluons. The double-pomeron interactions are expected to produce glueballs and hybrids preferentially, while the two-offshell-photon initial states should couple predominantly to quarkonia and multiquark states. Of particular interest is the possibility of carrying out a CP-violation study in the B decays. The KAON facility, proposed for TRIUMF, Vancouver, Canada, is an intense hadron factory with a proton flux some 25 times higher than that available at the BNL AGS with the Booster. Therefore, a general purpose hadron spectrometer will be able to tackle the problem of studying gluonic and multiquark degrees of freedom in strangeonia. 19 refs., 3 figs
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