The rho-mass, width and line shape in (p)over-barp annihilation at rest into pi(+)pi(-)pi(0)

Citation
A. Abele et al., The rho-mass, width and line shape in (p)over-barp annihilation at rest into pi(+)pi(-)pi(0), PHYS LETT B, 469(1-4), 1999, pp. 270-275
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
469
Issue
1-4
Year of publication
1999
Pages
270 - 275
Database
ISI
SICI code
0370-2693(199912)469:1-4<270:TRWALS>2.0.ZU;2-Q
Abstract
A high-statistics data sample on (p) over bar p --> pi(+)pi(-)pi(0) is stud ied to deduce the mass, width, and Line shape of charged and neutral rho me sons. We find that the line shape is well described by a relativistic Breit -Wigner function. We find mass degeneracy of the rho(+/-) and rho(0) masses when mixing with the omega in its pi(+)pi(-) decay mode is taken into acco unt. A fit with one mass and width for the three rho charge states yields m (rho) = (763.0 +/- 1.3) MeV and Gamma(rho) = (149.5 +/- 1.3) MeV. The mass difference between charged and neutral rho's is determined to be (1.6 +/- 0 .6 +/- 1.7) MeV. A possible influence on the rho mass due to the isobar app roximation is discussed. (C) 1999 Published by Elsevier Science B.V. All ri ghts reserved.