scholarly journals The structure of a resonance state

2017 ◽  
Vol 8 (7) ◽  
pp. 4804-4810 ◽  
Author(s):  
A. García-Vela
Keyword(s):  
Resonance State ◽  
Resonance Decay

The existence of a structure in a resonance state regarding the fragment state distributions produced upon resonance decay is investigated.

Search for $$\varvec{N\varDelta }$$ Resonance State Via the Exclusive Measurement of $$\varvec{\gamma d\rightarrow d \pi ^{+} \pi ^{-}}$$ Reaction

2021 ◽  
Vol 63 (1) ◽  
Author(s):  
Y. Toyama ◽  
T. Ishikawa ◽  
H. Kanda ◽  
M. Kaneta ◽  
K. Maeda ◽  
...  
Keyword(s):  
Resonance State ◽  
Exclusive Measurement

scholarly journals Evidence for $B^{(*)}_s$ Production at the ϒ(5S)

2005 ◽  
Vol 20 (16) ◽  
pp. 3669-3671 ◽  
Author(s):  
◽  
R. Sia
Keyword(s):  
Pair Production ◽  
B Mesons ◽  
Decay Properties ◽  
Resonance Decay ◽  
Preliminary Model

Based on data collected by the CLEO III detector at CESR, we started a series of investigations to open the mysteries of the ϒ(5 S ) resonance decay properties. Bs mesons are expected to decay predominantly into Ds meson, while the lighter B mesons decay into Ds only about 10% of the time. We exploit this difference to present the first evidence of a substantial production of Bs mesons at the ϒ(5 S ) resonance. We make here a preliminary model dependent estimate of the ratio of [Formula: see text] to the total [Formula: see text] quark pair production at the ϒ(5 S ) energy to be (21 ± 3 ± 9)%.

scholarly journals Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron

2020 ◽  
Vol 241 ◽  
pp. 01007
Author(s):  
Takatsugu Ishikawa ◽  
Hisako Fujimura ◽  
Hiroshi Fukasawa ◽  
Ryo Hashimoto ◽  
Qinghua He ◽  
...  
Keyword(s):  
Invariant Mass Distribution ◽  
Center Of Mass ◽  
Resonance State ◽  
Angular Distributions ◽  
Neutral Meson ◽  
Mass Energy ◽  
Meson Photoproduction ◽  
Neutral Pions ◽  
Center Of Mass Energy ◽  
Interesting Object

The B = 2 bound/resonance state (dibaryon) is an interesting object, which can be a molecule consisting of two baryons or a spatially compact hexaquark hadron object. The yd ^ n°n°d reaction has been experimentally investigated at incident energies ranging from 0.58 to 1.15 GeV to study non-strange dibaryons. The angular distributions of deuteron emission in the yd center-of-mass energy cannot be reproduced by quasi-free production of two neutral pions followed by deuteron coalescence. Additionally a 2.14-GeV peak is observed in the n°d invariant mass distribution. These suggest a sequential process such as yd ^ RIS ^ n°RIV ^ n°n°d with an isoscalar dibaryon RIS and an isovector dibaryon RIV. Since the mass of the observed isoscalar dibaryons are close to the sum of the nucleon (N) and nucleon resonance (N*) masses, an S-wave NN* molecule may play a role as a doorway to a dibaryon.

Finite Element Analysis on Axial-Torsional Coupled Vibration of Drill String

2011 ◽  
Vol 291-294 ◽  
pp. 1952-1956 ◽  
Author(s):  
Xue Liang Bi ◽  
Jian Wang ◽  
Zhan Lin Wang ◽  
Shi Hui Sun
Keyword(s):  
Finite Element ◽  
Coupled Model ◽  
Resonance State ◽  
Drill String ◽  
Hole Drilling ◽  
Drilling Process ◽  
Coupled Vibration ◽  
Element Analysis ◽  
Drilling String ◽  
Rotary Speed

In the drilling process, axial vibration, transverse vibration and torsional vibration happen to drilling string. And the coupled vibration is more complex. In the resonance state, drilling string collides with the wall, which causes serious damage on drilling string in a short time and results in economic loss to the drilling operation. In this paper, the regularity of coupled vibration is analyzed by using finite element method. The model of full-hole drilling strings is established. The distribution regularities of coupled resonant frequency are obtained through computer analysis. The coupled model is more accurate than single vibration model. And the gaps of high rotary speed resonance regions are larger. Resonance state can be avoided by changing rotary speed, and drilling accidents can be reduced.

scholarly journals Signature of a highly spin polarized resonance state at Co2MnSi(0 0 1)/Ag(0 0 1) interfaces

2018 ◽  
Vol 51 (13) ◽  
pp. 135307 ◽  
Author(s):  
Christian Lidig ◽  
Jan Minár ◽  
Jürgen Braun ◽  
Hubert Ebert ◽  
Andrei Gloskovskii ◽  
...  
Keyword(s):  
Resonance State ◽  
Spin Polarized

scholarly journals Analysis of the DD¯⁎K System with QCD Sum Rules

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Zun-Yan Di ◽  
Zhi-Gang Wang
Keyword(s):  
Spectral Density ◽  
Sum Rules ◽  
Resonance State ◽  
Energy Scale ◽  
Color Singlet ◽  
Qcd Sum Rules ◽  
Optimal Energy ◽  
Numerical Result ◽  
The Future ◽  
Vacuum Condensates

In this article, we construct the color singlet-singlet-singlet interpolating current with IJP=3/21- to study the DD¯⁎K system through QCD sum rules approach. In calculations, we consider the contributions of the vacuum condensates up to dimension-16 and employ the formula μ=MX/Y/Z2-2Mc2 to choose the optimal energy scale of the QCD spectral density. The numerical result MZ=4.71-0.11+0.19 GeV indicates that there exists a resonance state Z lying above the DD¯⁎K threshold to saturate the QCD sum rules. This resonance state Z may be found by focusing on the channel J/ψπK of the decay B→J/ψππK in the future.

scholarly journals Interference of a resonance state with itself: a route to control its dynamical behaviour

2020 ◽  
Vol 22 (26) ◽  
pp. 14637-14644
Author(s):  
A. García-Vela
Keyword(s):  
Laser Field ◽  
Quantum Interference ◽  
Dynamical Behavior ◽  
Resonance State ◽  
Weak Field ◽  
Dynamical Behaviour ◽  
State Distribution ◽  
Decay Lifetime

It is demonstrated both numerically and mathematically that the dynamical behavior of an isolated resonance state (the decay lifetime and the asymptotic fragment state distribution), can be extensively controlled by means of quantum interference induced by a laser field in the weak-field regime.

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