Review of Particle Physics C. Caso et al. (Particle Data Group), European Physical Journal.pdf

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Review of Particle Physics C. Caso et al. (Particle Data Group), European Physical Journal.pdf

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Review of Particle Physics C. Caso et al. (Particle Data Group), European Physical Journal

Review of Particle Physics: C. Caso et al. (Particle Data Group), European Physical Journal C3, 1 (1998) Σ(1385) P13 I (J P ) = 1( 32 +) Status: ???? Discovered by ALSTON 60. Early measurements of the mass and width for combined charge states have been omitted. They may be found in our 1984 edition Reviews of Modern Physics 56 No. 2 Pt. II (1984). We average only the most significant determinations. We do not average results from inclusive experiments with large backgrounds or results which are not accompanied by some discussion of ex- perimental resolution. Nevertheless systematic differences between experiments remain. (See the ideograms in the Listings below.) These differences could arise from interference effects that change with production mechanism and/or beam momentum. They can also be accounted for in part by differences in the parametriza- tions employed. (See BORENSTEIN 74 for a discussion on this point.) Thus BORENSTEIN 74 uses a Breit-Wigner with energy- independent width, since a P-wave was found to give unsatisfactory fits. CAMERON 78 uses the same form. On the other hand HOLM- GREN 77 obtains a good fit to their Λπ spectrum with a P-wave Breit-Wigner, but includes the partial width for the Σ π decay mode in the parametrization. AGUILAR-BENITEZ 81D gives masses and widths for five different Breit-Wigner shapes. The results vary con- siderably. Only the best-fit S-wave results are given here. Σ (1385) MASSES Σ (1385)+ MASS VALUE (MeV) EVTS DOCUMENT ID TECN COMMENT 1382.8±0.4 OUR AVERAGE Error includes scale factor of 2.0. See the ideogram below. 1384.1±0.7 1897 BAUBILLIER 84 HBC K?p 8.25 GeV/c 1384.5±0.5 5256 AGUILAR-... 81D HBC K?p → Λππ 4.2 GeV/c 1383.0±0.4 9361 AGUILAR-... 81D HBC K?p → Λ3π 4.2 GeV/c 1381.9±0.3 6900 CAMERON 78 HBC K?p 0.96–1.36 GeV/c 1381 ±1 6846 BORENSTEIN 74 HBC K?p 2.18 GeV/c 1383.5±0.85 2300 HABIBI 73 HBC K?p → Λππ 1382 ±2 400 AGUILAR-... 72B HBC K?p → Λπ ’s 1384.4±1.0 1260 SIEGEL 67 HBC K?p 2.1 GeV/c 1382 ±1 750 ARMENTEROS65B H