Summary
The reaction π+p → π+pπ+π− at 11.7 GeV/c is analysed using longitudinal phase space (L.P.S.) plots with a sample of about 6000 events. The results are compared with those obtained by Kittel, Ratti and Van Hove in the analysis of the reaction π−p → π−pπ−π+ at 11 and 16 GeV/c. The four dominant sectors 1) π+p → (3π)p, 2) π+p → π+(pπ+π−), 3) π+p → → (π+π+)(pπ−), 4) π+p → (π+π−)(pπ+), are examined in some detail. In particular, sectors 1) and 2) are very similar to the corresponding ones observed for π−p at the two momenta. The sectors 3) and 4) are compared in detail with the equivalent configurations observed in π−p at 11 GeV/c,i.e. 3′) π−p → (π−π−)(pπ+), 4′) π−p → (π+π−)(pπ−).
Riassunto
Si usano le distribuzioni sullo spazio delle fasi longitudinale (L.P.S.) per analizzare la reazione π+p → π+π+π−p a 11.7 GeV/c sopra un campione statistico di circa 6000 esemplari. I risultati ottenuti vengono confrontati con quelli ottenuti da Kittel, Ratti e Van Hove nell’analisi della reazione π−p → π−π−π+p a 11 e 16 GeV/c. Vengono esaminati in dettaglio i quattro settori longitudinali dominanti: 1) π+p → (3π)p, 2) π+p → → π+(pπ+π−), 3) π+p → (π+π+)(pπ−), 4) π+p → (π+π−)(pπ+). Si osserva che i settori 1) e 2) denunciano un comportamento molto simile ai corrispondenti settori delle collisioni p−π sia a 11 che a 16 GeV/c. I settori 3) e 4) vengono confrontati qualitativamente e quantitativamente con le corrispondenti configurazioni 3′) π−p → (π−π−)(pπ+), 4′) π−p → (π+π−)(pπ−). Dal confronto si possono dedurre le proprietà di fattorizzazione delle relative ampiezze di produzione.
Реэюме
Испольэуя обраэец, содержаший 6000 событий, и кривые продольного фаэового пространства, аналиэируется реакция π+р → π+pπ+π− при 11.7ГзВ/с. Полученные реэультаты сравниваются с реэультатами Киттеля и др., полученными при аналиэе реакции π−р → π−pπ−π+ при 11 и 16 ГзВ/с. Подробно исследуются четыре основных сектора:
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(1)
π+p → (3π)p,
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(2)
π+p → π+(pπ+π−),
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(3)
π+p → (π+π+)(pπ−),
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(4)
π+p → (π+π−)(pπ+)
В частности, секторы (1) и (2) очень похожи на соответствуюшие секторы, которые наблюдались в π−p соударениях при зтих двух импульсах. Секторы (3) и (4) подробно сравниваются с зквивалентными конфигурациями, наблюденными в реакции π−p при 11 ГзВ/с, т.е.:
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(3′)
π−p → (π−π−)(pπ+),
-
(4′)
π−p → (π+π−)(pπ−).
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References
W. Kittel, S. Ratti andL. Van Hove:Nucl. Phys.,30 B, 333 (1971).
For a detailed discussion of longitudinal phase space see:L. Van Hove:Nucl. Phys.,9 B, 331 (1969).
L. Van Hove:Factorization in high-energy hadron collisions, CERN preprint TH 1209, August 1970, to be published inAnn. of Phys.
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Tomasini, G., Bassler, E., Sahini, M. et al. Longitudinal phase-space analysis of the reaction π+p → π+pπ+π− at 11.7 GeV/c and comparison of the reactions π±p → π±π+π−p at the same energy. Nuov Cim A 7, 651–668 (1972). https://doi.org/10.1007/BF02734218
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DOI: https://doi.org/10.1007/BF02734218