https://doi.org/10.1140/epja/i2013-13123-7
Regular Article - Theoretical Physics
Broadening of ρ(→ e+e−) meson produced coherently in the photonuclear reaction
Nuclear Physics Division, Bhabha Atomic Research Centre, 400085, Mumbai, India
* e-mail: swapand@barc.gov.in
Received:
1
February
2013
Revised:
4
September
2013
Accepted:
9
September
2013
Published online:
16
October
2013
The e
+
e
− invariant mass distribution spectra are calculated to estimate the hadron parameters of the ρ meson produced coherently in the photonuclear reaction. The elementary reaction occurring in the nucleus is considered to proceed as γN → ρ
0
N; ρ
0 → e
+
e
−. We describe the elementary ρ meson photoproduction by the experimentally determined reaction amplitude 
. The ρ meson propagator is presented by the eikonal form, and the ρ meson nucleus optical potential V
Oρ
appearing in it is estimated using the “tϱ” approximation. The ρ meson nucleon scattering amplitude f
ρN
extracted from the measurements is used to generate this potential. The calculated e
+
e
− invariant mass distribution spectra are compared with those measured at Jefferson Laboratory. The calculated results for the transparency ratio are also presented.
© SIF, Springer-Verlag Berlin Heidelberg, 2013
