Relative Phase Angles in Leptonic Decay of Photoproduced Vector Mesons

1970 ◽  
Vol 1 (5) ◽  
pp. 1308-1311 ◽  
Author(s):  
Gary K. Greenhut ◽  
Roy Weinstein ◽  
Ronald G. Parsons
Keyword(s):  
Relative Phase ◽  
Leptonic Decay ◽  
Vector Mesons ◽  
Phase Angles

VECTOR MESON MODIFICATION IN NUCLEAR MATTER AT CLAS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2417-2420 ◽  
Author(s):  
CHADEN DJALALI ◽  
MIKE WOOD ◽  
RAKHSHA NASSERIPOUR ◽  
DENNIS WEYGAND ◽  
The CLAS COLLABORATION
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Leptonic Decay ◽  
Meson Mass ◽  
Combinatorial Background ◽  
Vector Mesons ◽  
Jefferson Lab ◽  
Mass Distributions ◽  
Collisional Broadening ◽  
Large Acceptance

Photoproduction of vector mesons off nuclei were performed at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). The properties of the ρ vector mesons were investigated via their rare leptonic decay to e+e−. After subtracting the combinatorial background, the ρ meson mass distributions were extracted for each of the targets. We observe no effects on the mass of the ρ meson, some widening in titanium and iron is observed consistent with the collisional broadening.

Retraction: Leptonic decay widths of vector mesons in a relativistic potential model

2014 ◽  
Vol 92 (5) ◽  
pp. 458-458
Author(s):  
S.N. Jena ◽  
R.N. Mishra ◽  
P.K. Nanda ◽  
S. Sahoo
Keyword(s):  
Potential Model ◽  
Leptonic Decay ◽  
Vector Mesons ◽  
Decay Widths ◽  
Relativistic Potential

LEPTONIC DECAY WIDTHS OF VECTOR MESONS IN A RELATIVISTIC POTENTIAL MODEL

2014 ◽  
Vol 92 (5) ◽  
Author(s):  
S.N. Jena ◽  
R.N. Mishra ◽  
P.K. Nanda ◽  
S. Sahoo
Keyword(s):  
Potential Model ◽  
Transition Probability ◽  
Center Of Mass ◽  
Heavy Meson ◽  
Leptonic Decay ◽  
Vector Mesons ◽  
Electromagnetic Decay ◽  
Decay Constants ◽  
Decay Widths ◽  
Experimental Values

Leptonic decay widths and the corresponding decay constants of neutral vector mesons are calculated in the framework of a square-root potential model of independent quarks. Starting with the assumption that a strong correlation exists between the momenta of the quark and anti-quark inside the meson so as to have their total momenta identically zero in the center-of-mass frame of the meson, we find the quark and anti-quark momentum distribution amplitude which is used to determine the transition probability amplitude for the leptonic decay of mesons. The calculated results for leptonic decay widths and the electromagnetic decay constants for the vector mesons \rho, \omega, \phi and \psi are in good agrement with the corresponding experimental values. The results for the heavy meson \Upsilon are somewhat lower than the experimental values.

LIFT AND POWER REQUIREMENTS IN FLIGHT IN A DRAGONFLY

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1435-1438 ◽  
Author(s):  
MAO SUN ◽  
JI KANG WANG
Keyword(s):  
Relative Phase ◽  
Stokes Equations ◽  
Flight Speed ◽  
Navier Stokes ◽  
Forward Flight ◽  
Power Requirement ◽  
Navier Stokes Equations ◽  
Small Change ◽  
Phase Angles

The lift and power requirements of a model dragonfly in forward flight are studied, using the method of numerically solving the Navier-Stokes equations. The graph of power against flight speed is U-shaped, suggesting that a dragonfly might have a preferred cruising speed. Considerable variation in the relative phase between fore- and hindwings results in only very small change in power requirement. This suggests theat the forewing-hingwing interaction is weak and furthermore, might explain why phase angles ranging from to are employed by dragonflies in hovering and forward flight.

Leptonic decay of light vector mesons in an independent quark model

1993 ◽  
Vol 47 (3) ◽  
pp. 1001-1006 ◽  
Author(s):  
N. Barik ◽  
P. C. Dash ◽  
A. R. Panda
Keyword(s):  
Quark Model ◽  
Leptonic Decay ◽  
Vector Mesons ◽  
Light Vector
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