scholarly journals Can the state Y(4626) be a P -wave tetraquark state [cs][c¯s¯] ?

2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Chengrong Deng ◽  
Hong Chen ◽  
Jialun Ping
Keyword(s):  
The State ◽  
P Wave ◽  
Tetraquark State

Exact inversion of plane‐layered isotropic and anisotropic elastic media by the state‐space approach

Geophysics ◽  
1986 ◽  
Vol 51 (11) ◽  
pp. 2031-2050 ◽  
Author(s):  
Mark Meadows ◽  
Shimon Coen
Keyword(s):  
State Space ◽  
Transverse Isotropy ◽  
The State ◽  
P Wave ◽  
State Space Method ◽  
Sh Wave ◽  
Wave Source ◽  
State Space Approach ◽  
Space Method ◽  
Space Approach

Time‐domain state‐space inversion methods for non‐dispersive layered media have shown that acoustic impedance as a function of traveltime can be determined from a normally incident, plane, pressure‐wave source. The state‐space method is used here to determine the density and acoustic velocity separately as functions of depth by simultaneously inverting surface data measured at two precritical angles of incidence. The acoustic state‐space method is also applied to isotropic elastic media with normally incident P-waves and obliquely incident SH-wave sources, whereby the density, shear velocity, and compressional velocity are determined as functions of depth. The same parameters are recovered by modifying Shiva and Mendel's (1983) method for a single, obliquely incident P-wave source to accommodate a single SV-wave source, two P-wave sources, or data obtained from a previous (scalar) SH-wave inversion. Using data from multiple experiments eliminates nonuniqueness in the inversion procedure. We have extended the state‐space approach to generally anisotropic media to solve for the layer thicknesses, densities, elastic stiffness parameters, and symmetry axis rotation angles in each layer. Three‐component recording is required to identify the wave types at each interface and to downward continue the wave fields properly at depth. For transverse isotropy and all higher anisotropies, an [Formula: see text]-parameter search is required at each interface, where 1 ⩽ n ⩽ 25. This adds an inherent nonuniqueness to the inversion. However, for transverse isotropy, nonuniqueness does not appear to be a serious problem since the layer parameters are determined by a single‐parameter search of a monotonic function at each interface. It appears that slant stacking of multicomponent surface seismograms is applicable to generally anisotropic media and that methods that deal with noise and band limitations in acoustic media can be useful to anisotropic inversion as well.

scholarly journals Excited weak bosons and dark matter

2018 ◽  
Vol 33 (31) ◽  
pp. 1844011
Author(s):  
Harald Fritzsch
Keyword(s):  
Dark Matter ◽  
Bound States ◽  
The State ◽  
P Wave

The weak bosons are bound states. The state with the lowest mass is identified with the boson, which has been discovered at the LHC. The p-wave excitations are studied. Specific properties of the excited bosons are discussed, in particular their decays into weak bosons and photons. The stable fermion, consisting of three fermions, provides the dark matter in our universe.

scholarly journals Composite weak bosons at the large hadronic collider

2016 ◽  
Vol 31 (20) ◽  
pp. 1630019 ◽  
Author(s):  
Harald Fritzsch
Keyword(s):  
Composite Model ◽  
The State ◽  
P Wave ◽  
Two Photon ◽  
Hadronic Collider ◽  
Heavy Boson ◽  
Photon Signal ◽  
Large Hadronic Collider

In a composite model of the weak bosons the p-wave bosons are studied. The state with the lowest mass is identified with the boson, which has been discovered at the LHC. Specific properties of the excited bosons are discussed, in particular their decays into weak bosons and photons. Recently a two-photon signal has been observed, which might come from the decay of a neutral heavy boson with a mass of about 0.75 TeV. This particle could be an excited weak tensor boson.

scholarly journals Ultrasonic Spectrum Analysis of Granite Damage Evolution Based on Dry-Coupled Ultrasonic Monitoring Technology

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yang Liu ◽  
Lan Qiao ◽  
Yuan Li ◽  
Guodong Ma ◽  
Andrei M. Golosov ◽  
...  
Keyword(s):  
Crack Growth ◽  
Wave Velocity ◽  
Growth Stage ◽  
Dominant Frequency ◽  
The State ◽  
P Wave ◽  
Ultrasonic Monitoring ◽  
S Wave ◽  
Spectral Parameters ◽  
Acoustic Spectrum

The self-developed dry-coupled rock ultrasonic monitoring system is adopted to set up a multidirectional and multiwaveform ultrasonic monitoring network, which aims to analyse the evolution law of acoustic spectrum parameters in the process of granite loading failure under uniaxial compression, to explore the dominant acoustic spectrum characteristic information at different stages of granite loading, and to verify in situ the damage monitoring of time-effect deformation. The results show that the wave velocity, amplitude, and amplitude-frequency of the first wave and the velocity of P-wave and S-wave show a significant upward trend in the rock compaction section. After entering the elastic stage, the three spectral parameters become peacefully stable, and the stage transformation is obvious. In the stable crack growth stage, with the initiation of the crack, the dominant frequency of S-wave shows a significant stage transition compared with the global ultrasonic wave velocity and the first arrived amplitude, and the dominant frequency decreases by 6%. In the unstable crack growth stage, the three acoustic spectrum parameters present obvious downward trend, and the first arrived wave amplitude of S-wave is found to have a significant decline of 39.1%. On the eve of failure, the amplitude-frequency of S-wave shows different feature from the P-wave; that is, S-wave transfers from the state of multipeak in wide frequency to the state of single peak in low frequency, which is the failure precursor of the rock sample.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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