Evidence for ϱ1(1270) production in the reaction K-p → π+π-Λ

D. Aston, N. Awaji, T. Bienz, F. Bird, J. D'Amore, W. Dunwoodie, R. Endorf, K. Fujii, H. Hayashii, S. Iwata, W. Johnson, R. Kajikawa, P. Kunz, Y. Kwon, D. Leith, L. Levinson, J. Martinez, T. Matsui, B. Meadows, A. MiyamotoM. Nussbaum, H. Ozaki, C. Pak, B. Ratcliff, P. Rensing, D. Schultz, S. Shapiro, T. Shimomura, P. Sinervo, A. Sugiyama, S. Suzuki, G. Tarnopolsky, T. Tauchi, N. Toge, K. Ukai, A. Waite, S. Williams

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Preliminary results are presented from an analysis of the π+π- system produced in the reaction K-p → π+π-Λ at 11 GeV/c observed with the LASS spectrometer at SLAC. A clear ρ{variant} - ω interference effect is observed, and a fit to the natural parity exchange mass distribution yields a branching fraction estimate of (1.7 ± 0.5) % for the decay ω → π+π-. An amplitude analysis reveals that the bump in the mass distribution in the vicinity of the f{hook}2(1270) actually contains a significant P-wave component. The mass dependence of the corresponding amplitude and phase is well described by a resonant Breit-Wigner line-shape with mass (1266 ± 14) MeV/c2, width (166 ± 35) MeV/c2, and estimated elasticity ∼ 5%. The interpretation of this state as the first radial excitation of the ρ{variant}(770) is discussed.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalNuclear Physics B (Proceedings Supplements)
Volume21
Issue numberC
DOIs
Publication statusPublished - 1991 Jun

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Evidence for ϱ1(1270) production in the reaction K-p → π+π-Λ'. Together they form a unique fingerprint.

  • Cite this

    Aston, D., Awaji, N., Bienz, T., Bird, F., D'Amore, J., Dunwoodie, W., Endorf, R., Fujii, K., Hayashii, H., Iwata, S., Johnson, W., Kajikawa, R., Kunz, P., Kwon, Y., Leith, D., Levinson, L., Martinez, J., Matsui, T., Meadows, B., ... Williams, S. (1991). Evidence for ϱ1(1270) production in the reaction K-p → π+π-Λ. Nuclear Physics B (Proceedings Supplements), 21(C), 105-110. https://doi.org/10.1016/0920-5632(91)90243-8