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

Authors
Abele, A Adomeit, J Amsler, C Anisovich, AV Baker, CA Barnett, BM Batty, CJ Berdoz, A Bischoff, S Blum, P Braune, K Bugg, DV Case, T Cramer, O Crede, V Crowe, KM Degener, T Doser, M Dunnweber, W Ehmanns, A Engelhardt, D Faessler, MA Giarritta, P Haddock, RP Heinsius, FH Heinzelmann, M Herbstrith, A Herz, M Hessey, NP Hidas, P Hodd, C Holtzhaussen, C Jamnik, D Kalinowsky, H Kammel, P Kisiel, J Klempt, E Koch, H Kunze, M Kurilla, U Lakata, M Landua, R Matthay, H McCrady, R Meier, J Meyer, CA Ouared, R Peters, K Pick, B Ratajczak, M Regenfus, C Roethel, W Spanier, S Stock, H Strassburger, C Strohbusch, U Suffert, M Suh, JS Thoma, U Tischhauser, M Uman, I Volcker, C Wallis-Plachner, S Walther, D Wiedner, U Wittmack, K Zou, BS
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
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → 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.