8540093
Analysis of the Y(4140) and related molecular states with QCD sum rules
In this article, we assume that there exist scalar ${D}^{\ast}{\bar {D}}^{\ast}$, ${D}_{s}^{\ast}{\bar{D}}_{s}^{\ast}$, ${B}^{\ast}{\bar {B}}^{\ast}$ and ${B}_{s}^{\ast}{\bar{B}}_{s}^{\ast}$ molecular states, and study their masses using the QCD sum rules. The numerical results indicate that the masses are about (250–500) MeV above the corresponding D*–${\bar{D}}^{\ast}$, Ds*–${\bar {D}}_{s}^{\ast}$, B*–${\bar{B}}^{\ast}$ and Bs*–${\bar {B}}_{s}^{\ast}$ thresholds, the Y(4140) is unlikely a scalar ${D}_{s}^{\ast}{\bar{D}}_{s}^{\ast}$ molecular state. The scalar $D^{\ast}{\bar{D}}^{\ast}$, $D_{s}^{\ast}{\bar{D}}_{s}^{\ast}$, $B^{\ast}{\bar{B}}^{\ast}$ and $B_{s}^{\ast}{\bar{B}}_{s}^{\ast}$ molecular states maybe not exist, while the scalar ${D'}^{\ast}{\bar{D}}^{\prime\ast}$, ${D}_{s}^{\prime\ast}{\bar{D}}_{s}^{\prime\ast}$, ${B}^{\prime\ast}{\bar{B}}^{\prime\ast}$ and ${B}_{s}^{\prime\ast}{\bar{B}}_{s}^{\prime\ast}$ molecular states maybe exist.
119252067
Next-to-leading Order Perturbative Contributions in the QCD Sum Rules for Mesonic Two-point Correlation Functions with Unequal Quark Masses
In this article, we assume that the two quarks have unequal masses and calculate the next-to-leading order contributions to the spectral densities of the mesonic two-point correlation functions of the vector, axialvector, scalar and pseudoscalar currents. We take dimensional regularization to regularize both the ultraviolet and infrared divergences, and use optical theorem to obtain the spectral densities directly, furthermore, we present some necessary technical details for readers convenience. The analytical expressions are applicable in many phenomenological analysis besides the QCD sum rules.
118179000
Magnetic moment of the pentaquark state $\Theta^+(1540)$
In this article, we study the magnetic moment of the pentaquark $ \Theta^+(1540)$ as (scalar)diquark-(pseudoscalar)diquark-antiquark state with the QCD sum rules approach in the external electromagnetic field. Due to the special structure of the interpolating current, only the electromagnetic interactions of the $s$ quark with the external field have contributions to the magnetic moment with tensor structure $\{\sigma_{\mu\nu} {\hat p} +{\hat p}\sigma_{\mu\nu}\}$. The numerical results indicate the magnetic moment of the pentaquark state $ \Theta^+(1540)$ is about $\mu_{\Theta^+}=(0.16\pm0.03)\mu_N$.
119121085
ANALYSIS OF THE $B \to K^*_2(1430), a_2(1320), f_2(1270)$ FORM-FACTORS WITH LIGHT-CONE QCD SUM RULES
In this paper, we study the form-factors with the light-cone QCD sum rules, where the B-meson light-cone distribution amplitudes are used. In calculations, we observe that the line-shapes of the B-meson light-cone distribution amplitude ϕ+(ω) have significant impacts on the values of the form-factors, and expect to obtain severe constraints on the parameters of the B-meson light-cone distribution amplitudes from the experimental data in the future.
15122700
Analysis of the Y(2175) as a tetraquark state with QCD sum rules
Abstract In this article, we take the point of view that Y ( 2175 ) be a tetraquark state which consists of color octet constituents, and calculate its mass and decay constant within the framework of the QCD sum rule approach. We release standard criterion in the QCD sum rules approach and take more phenomenological analysis, the value of the mass of Y ( 2175 ) is consistent with experimental data; there may be some tetraquark components in the state Y ( 2175 ) . If we retain standard criterion, larger mass than experimental data can be obtained, the current J μ ( x ) can interpolate a tetraquark state with larger mass, or Y ( 2175 ) has some components with larger mass. The dominating contribution comes from the perturbative term, which is in contrast to the sum rules with interpolating currents constructed from diquark pairs. The tetraquark states may consist of color octet constituents rather than diquark pairs.
118430852
Analysis of mass difference of the $\pi$ and $\rho$ with Bethe-Salpeter equation
In this article, we take into account the one-pion exchange force besides the onegluon exchange force to study the mass difference of the π and ρ mesons with the Bethe-Salpeter equation. After projecting the Bethe-Salpeter equation into an simple form, we can see explicitly that the bound energy |Eπ| ≫ |Eρ|. PACS number: 12.39.Ki, 12.39.Pn
56066308
Plasma deposition of high temperature protective coatings
Oxide ceramic films can be made using a vacuum arc based technique in which a metal plasma is formed in an oxygen background, with ion energy controlled by the application of a repetitive pulse bias to the substrate throughout the deposition. High ion energy early in the process produces atomic mixing at the film-substrate interface while lower but optimized ion energy later in the deposition can control the structure and morphology, and films that are adherent and dense can be formed in this way. In recent work we have investigated the formation of films of aluminum-silicon oxide on silicon carbide substrates by mixed aluminum and silicon plasmas produced from separate plasma sources. The Al to Si ratio was controlled by the plasma gun parameters, and the guns were pulsed simultaneously so as to mix the plasma streams before deposition; a magnetic multiple plasma homogenizer device was also used to further blend the two plasmas. Films with Al:Si ratios varying from 2:1 to 8:1 were produced in this study (Al:Si is 3:1 for Mullite), and the oxygen content in the films was controlled by varying the oxygen partial pressure during deposition. Additionally, we have compared some of the characteristics of alumina films plasma deposited on iron aluminide substrates with films produced by e-beam evaporation of Al{sub 2}O{sub 3} using oxygen ion beam assisted deposition onto unheated or heated substrates. Here we outline the film synthesis techniques and describe the characterization results obtained to-date.
14055947
Classification of symmetric polynomials of infinite variables: Construction of Abelian and non-Abelian quantum Hall states
Classification of complex wave functions of infinite variables is an important problem since it is related to the classification of possible quantum states of matter. In this paper, we propose a way to classify symmetric polynomials of infinite variables using the pattern of zeros of the polynomials. Such a classification leads to a construction of a class of simple non-Abelian quantum Hall states which are closely related to parafermion conformal field theories.
9937378
A MID-INFRARED COUNTERPART TO THE MAGNETAR 1E 2259+586
We report the discovery of a 4.5μm counterpart to the anomalous X-ray pulsar (magnetar) 1E 2259+586 with 
the Spitzer Space Telescope. The mid-infrared flux density is 6.3 ± 1.0μJy at 4.5μm and <20 μJy (at 95% 
confidence) at 8μm, or 0.02% of the 2–10 keV X-ray flux (corrected for extinction). Combining our Spitzer 
measurements with previously published near-infrared data, we show that the overall infrared emission from 1E 
2259+586 is qualitatively similar to that from the magnetar 4U 0142+61. Therefore, the passive X-ray-heated dust 
disk model originally developed for 4U 0142+61 might also apply to 1E 2259+586. However, the IR data from 
this source can also be fitted by a simple power-law spectrum as might be expected from magnetospheric emission.
19017470
Topological properties of Abelian and non-Abelian quantum Hall states classified using patterns of zeros
It has been shown that different Abelian and non-Abelian fractional quantum Hall states can be characterized by patterns of zeros described by sequences of integers ${{S}_{a}}$. In this paper, we will show how to use the data ${{S}_{a}}$ to calculate various topological properties of the corresponding fraction quantum Hall state, such as the number of possible quasiparticle types and their quantum numbers, as well as the actions of the quasiparticle tunneling and modular transformations on the degenerate ground states on torus.
120963755
Optical properties of wavelength shifting panels
This paper describes the determination of the optical properties of the Bicron wavelength shifting acrylic plastic (BC-480) that absorbs ultraviolet radiation and then reemit it in the visible part of the spectrum. The refractive index and the attenuation coefficient as a function of wavelength were determined from transmission and reflection data. The reemitted visible spectrum was accurately measured using an optical multichannel analyzer and the quantum efficiency of the photoluminescence (the ratio between the number of emitted photons to the absorbed photons) was determined at different wavelengths in the ultraviolet. Finally, these results are applied to determine the effectiveness of this wavelength shifting panel as a means of detecting the ultraviolet component of the Cherenkov spectrum produced by a relativistic particle in water.