ρ-Dominance Electromagnetic Pion Form Factor with Vacuum-Polarization Insertions
Keyword(s):
The ρ-meson propagator is modified by insertions of the vacuum-polarization tensor due to charged pion pairs. The sum of all such contributing graphs via the Duffin–Kemmer formalism is seen to give a Breit–Wigner-type expression for the electromagnetic pion form factor. The width of the ρ meson is associated with the absorptive part of the pion form factor and at t = mρ2 we estimate fρππ2/4π = 2.5 using the experimental width Γρ = 125 ± 20 MeV.
2008 ◽
Vol 23
(29)
◽
pp. 4709-4719
◽
1992 ◽
Vol 292
(3-4)
◽
pp. 442-447
◽
2001 ◽
Vol 16
(22)
◽
pp. 3755-3783
2007 ◽
Vol 22
(24)
◽
pp. 4375-4436
◽
2010 ◽
Vol 684
(2-3)
◽
pp. 123-126
◽
Keyword(s):