Effect of the phase space factor in the breakup of composite particles

1981 ◽  
Vol 23 (4) ◽  
pp. 1839-1840 ◽  
Author(s):  
G. Paić ◽  
B. Antolković
Keyword(s):  
Phase Space ◽  
Composite Particles ◽  
Space Factor ◽  
Phase Space Factor

scholarly journals RATE OF PARITY VIOLATION FROM MEASURE CONCENTRATION

2008 ◽  
Vol 23 (03n04) ◽  
pp. 509-517 ◽  
Author(s):  
NIKOS KALOGEROPOULOS
Keyword(s):  
Phase Space ◽  
Statistical Mechanics ◽  
Parity Violation ◽  
Degrees Of Freedom ◽  
Relative Rate ◽  
Measure Concentration ◽  
Space Factor ◽  
Geometric Argument ◽  
Phase Space Factor ◽  
Opposite Chirality

We present a geometric argument determining the kinematic (phase-space) factor contributing to the relative rate at which degrees of freedom of one chirality come to dominate over degrees of freedom of opposite chirality, in models with parity violation. We rely on the measure concentration of a subset of a Euclidean cube which is controlled by an isoperimetric inequality. We provide an interpretation of this result in terms of ideas of statistical mechanics.

scholarly journals Study of the Effect of Newly Calculated Phase Space Factor on β-Decay Half-Lives

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Mavra Ishfaq ◽  
Jameel-Un Nabi ◽  
Ovidiu Niţescu ◽  
Mihail Mirea ◽  
Sabin Stoica
Keyword(s):  
Phase Space ◽  
Nuclear Matrix ◽  
Matrix Elements ◽  
Β Decay ◽  
Space Factor ◽  
Comparison With Experiment ◽  
Reliable Computation ◽  
Phase Space Factor ◽  
The Subject ◽  
New Phase

We present results for β-decay half-lives based on a new recipe for calculation of phase space factors recently introduced. Our study includes fp-shell and heavier nuclei of experimental and astrophysical interests. The investigation of the kinematics of some β-decay half-lives is presented, and new phase space factor values are compared with those obtained with previous theoretical approximations. Accurate calculation of nuclear matrix elements is a prerequisite for reliable computation of β-decay half-lives and is not the subject of this paper. This paper explores if improvements in calculating the β-decay half-lives can be obtained when using a given set of nuclear matrix elements and employing the new values of the phase space factors. Although the largest uncertainty in half-lives computations come from the nuclear matrix elements, introduction of the new values of the phase space factors may improve the comparison with experiment. The new half-lives are systematically larger than previous calculations and may have interesting consequences for calculation of stellar rates.

STRUCTURELESS COMPOSITENESS AND THE LEP W+W- DATA

1998 ◽  
Vol 13 (36) ◽  
pp. 2903-2907
Author(s):  
E. H. LEMKE
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Total Cross Section ◽  
Cross Section ◽  
Quantum Mechanical ◽  
Final State ◽  
Space Factor ◽  
Mechanical Interference ◽  
Phase Space Factor ◽  
Rule Out

We specify the electroweak scenario of structureless compositeness (SC) put forward previously to the case of identical masses m(W±)=m(Φ±) and m(Z)=m(Φ0). The resulting quantum-mechanical interference will exhibit a vector–scalar phase interlocking of exactly π. We calculate the total cross-section of e+e-→ W+W- in this scenario and compare with the SM. The experimental data is found not to rule out any of the four scenarios SM, κ an =0, SC at κ=1 and 0. Pronounced differences between these four cases show up for the σ tot contribution of the W L W L final state. The effects are illustrated in plots free of the trivial phase-space factor.

A parametrization of the phase space factor for allowed β-decay

1974 ◽  
Vol 232 (1) ◽  
pp. 58-92 ◽  
Author(s):  
D.H. Wilkinson ◽  
B.E.F. Macefield
Keyword(s):  
Phase Space ◽  
Β Decay ◽  
Space Factor ◽  
Phase Space Factor

GUP deformed phase-space and axiomatic thermodynamic self-consistency

2019 ◽  
Vol 34 (06n07) ◽  
pp. 1950039
Author(s):  
Asmaa G. Shalaby
Keyword(s):  
Phase Space ◽  
Partition Function ◽  
Generalized Uncertainty Principle ◽  
Thermodynamic Quantities ◽  
Number Density ◽  
High Frequencies ◽  
Space Factor ◽  
Phase Space Factor ◽  
Set Up ◽  
Self Consistency

Based on the generalized uncertainty principle (GUP) with a deformation of the phase-space, the partition function has recently been modified. In the present work, we analyze the self-consistency of the axiomatic thermodynamics derived from the deformed partition function. First, we set up the thermodynamic quantities such as pressure, energy density, entropy and number density, then we extend the study for testing the approval of consistency. We found that the deformed phase-space satisfies the axiomatic self-consistency of thermodynamics. We would expect the effects of GUP to be more pronounced at high frequencies, but the used deformed phase-space factor would still diverge as [Formula: see text] approaches [Formula: see text].

scholarly journals Remark on the Kinematics of the One-Photon Production in Electron–Proton Scattering

1997 ◽  
Vol 12 (21) ◽  
pp. 1553-1559
Author(s):  
Wei Lu
Keyword(s):  
Phase Space ◽  
Deeply Virtual Compton Scattering ◽  
Quark Distribution ◽  
Photon Production ◽  
Distribution Functions ◽  
Proton Scattering ◽  
Diquark Model ◽  
Space Factor ◽  
The Cross ◽  
The One

We clarify some misleading mistakes in the literature about the phase space for the one-photon production in electron–proton scattering and present the correct overall phase space factor in the cross-section formula. Our conclusion is that the earlier diquark model predictions for the cross-sections of the one-photon production in electron–proton scattering are unreliable. Furthermore, we specify the phase space boundaries. In relation to the recent proposal to measure the off-diagonal quark distribution functions in the deeply virtual Compton scattering off the proton, we point out that the kinematics strongly disfavors such experiments.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

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