The ωπ- mass spectrum, in the reaction π-p → ωπ-pat 11.2 GeV/c, shows the production of the B- meson with a cross section of 27 ± 5 μb as well as a clear enhancement around 1670 MeV. In the differential cross section for B- production, there is a strong forward peak and a change of slope at t' t 0.2 GeV2. From the spin-parity decomposition of the ωπ- system, performd using both a standard moments analysis and a partial-wave analysis, we have found that JP = 1+ is the most likely spin-parity assignment for the B-, thus confirming previous results. The spin-density matrix elements, evaluated in the GJ frame, suggest that natural parity exchange dominates the B- production. The ω helicity-zero contribution is |F01+|2 = 0.06 ± 0.04, implying a ratio |CD1+|/|CS1+| = 0.4 ± 0.1.

Analysis of the ωπ− system produced in the reaction π−p→π−π−π+π0pat 11.2 GeV/c / R. Gessaroli, A. Quareni-Vignudelli, S. Berti, A. Cartacci, C. Caso, F. Fontanelli, S. Squarcia, U. Trevisan, A. Boldetti, G. Costa, L. Perini, M. Game, G. Thompson, S. Alborghetti, L. Mapelli. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - 126:3(1977), pp. 382-396. [10.1016/0550-3213(77)90285-1]

Analysis of the ωπ− system produced in the reaction π−p→π−π−π+π0pat 11.2 GeV/c

L. Perini;
1977

Abstract

The ωπ- mass spectrum, in the reaction π-p → ωπ-pat 11.2 GeV/c, shows the production of the B- meson with a cross section of 27 ± 5 μb as well as a clear enhancement around 1670 MeV. In the differential cross section for B- production, there is a strong forward peak and a change of slope at t' t 0.2 GeV2. From the spin-parity decomposition of the ωπ- system, performd using both a standard moments analysis and a partial-wave analysis, we have found that JP = 1+ is the most likely spin-parity assignment for the B-, thus confirming previous results. The spin-density matrix elements, evaluated in the GJ frame, suggest that natural parity exchange dominates the B- production. The ω helicity-zero contribution is |F01+|2 = 0.06 ± 0.04, implying a ratio |CD1+|/|CS1+| = 0.4 ± 0.1.
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/179727
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