Asymmetry Parameter and Branching Ratio ofΣ+→pγ

1969 ◽  
Vol 188 (5) ◽  
pp. 2077-2080 ◽  
Author(s):  
Lawrence K. Gershwin ◽  
Margaret Alston-Garnjost ◽  
Roger O. Bangerter ◽  
Angela Barbaro-Galtieri ◽  
Terry S. Mast ◽  
...  
Keyword(s):  
Asymmetry Parameter ◽  
Branching Ratio

Measurement of the branching ratio and asymmetry parameter for theΣ+→pγ radiative decay

1995 ◽  
Vol 51 (9) ◽  
pp. 4638-4660 ◽  
Author(s):  
S. Timm ◽  
I. F. Albuquerque ◽  
N. F. Bondar ◽  
R. Carrigan ◽  
D. Chen ◽  
...  
Keyword(s):  
Asymmetry Parameter ◽  
Radiative Decay ◽  
Branching Ratio

scholarly journals A preliminary measurement of the Ξ0→Σ0γ branching ratio and asymmetry parameter

1989 ◽  
Author(s):  
S. Teige ◽  
A. Beretvas ◽  
A. Caracappa ◽  
T. Devlin ◽  
H. T. Diehl ◽  
...  
Keyword(s):  
Asymmetry Parameter ◽  
Branching Ratio ◽  
Preliminary Measurement

Measurement of theΞ0→Σ0γ branching ratio and asymmetry parameter

1989 ◽  
Vol 63 (25) ◽  
pp. 2717-2720 ◽  
Author(s):  
S. Teige ◽  
A. Beretvas ◽  
A. Caracappa ◽  
T. Devlin ◽  
H. T. Diehl ◽  
...  
Keyword(s):  
Asymmetry Parameter ◽  
Branching Ratio

POLARIZED HEAVY BARYON DECAYS

2003 ◽  
Vol 18 (08) ◽  
pp. 1429-1432
Author(s):  
CHUNG-HSIEN CHOU
Keyword(s):  
Angular Distribution ◽  
Perturbative Qcd ◽  
Asymmetry Parameter ◽  
Branching Ratio ◽  
Heavy Baryon ◽  
Factorization Theorem ◽  
Nonleptonic Decay ◽  
Qcd Factorization ◽  
Quark Decay ◽  
B Quark

We calculate the amplitudes involved in the heavy baryon nonleptonic decay Λb → ΛJ/ψ using perturbative QCD factorization theorem, which are expressed as convolutions of hard b quark decay amplitudes with the Λb baryon, Λ baryon and J/ψ meson distribution amplitudes. It is found that nonfactorizable contributions dominate over factorizable ones. Employing the distribution amplitudes determined in our previous works, we derive the branching ratio B(Λb → ΛJ/ψ) = (1.65 ~ 5.27) × 10-4 in agreement with data. We predict an asymmetry parameter α = -0.17 ~ -0.14 associated with the anisotropic angular distribution of the Λ baryons produced in polarized Λb baryon decays.

The Asymmetry Parameter and Aggregate Particles

1997 ◽  
Author(s):  
Gorden Videen ◽  
Ronald G. Pinnick ◽  
Dat Ngo ◽  
Qiang Fu ◽  
Petr Chylek
Keyword(s):  
Asymmetry Parameter ◽  
The Asymmetry ◽  
Aggregate Particles

scholarly journals Full-dimensional quantum stereodynamics of the non-adiabatic quenching of OH(A2Σ+) by H2

2021 ◽  
Author(s):  
Bin Zhao ◽  
Shanyu Han ◽  
Christopher L. Malbon ◽  
Uwe Manthe ◽  
David. R. Yarkony ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Previous Analysis ◽  
Branching Ratio ◽  
Energy Matrix ◽  
Elastic Channel ◽  
Electronically Excited ◽  
Oppenheimer Approximation ◽  
Electronic Motion ◽  
Adiabatic Dynamics ◽  
Good Agreement

AbstractThe Born–Oppenheimer approximation, assuming separable nuclear and electronic motion, is widely adopted for characterizing chemical reactions in a single electronic state. However, the breakdown of the Born–Oppenheimer approximation is omnipresent in chemistry, and a detailed understanding of the non-adiabatic dynamics is still incomplete. Here we investigate the non-adiabatic quenching of electronically excited OH(A2Σ+) molecules by H2 molecules using full-dimensional quantum dynamics calculations for zero total nuclear angular momentum using a high-quality diabatic-potential-energy matrix. Good agreement with experimental observations is found for the OH(X2Π) ro-vibrational distribution, and the non-adiabatic dynamics are shown to be controlled by stereodynamics, namely the relative orientation of the two reactants. The uncovering of a major (in)elastic channel, neglected in a previous analysis but confirmed by a recent experiment, resolves a long-standing experiment–theory disagreement concerning the branching ratio of the two electronic quenching channels.

scholarly journals Search for π0 decays to invisible particles

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
E. Cortina Gil ◽  
◽  
A. Kleimenova ◽  
E. Minucci ◽  
S. Padolski ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Confidence Level ◽  
Branching Ratio ◽  
Standard Model Higgs Boson ◽  
Scalar Mixing ◽  
Upper Limit ◽  
Upper Limits ◽  
The Standard Model ◽  
Model Independent

Abstract The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

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