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ρ0, f0, ω0 production on nuclei and protons by 15, 16 GeV/c π

Рождение ρ0, f0 и ω0 на ядрах и протонах отрицательными-меэонами с импульсами 15 и 16ГзВ/с

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Il Nuovo Cimento A (1965-1970)

Summary

Partial cross-sections are presented for ρ0, f0 and ω0 production by 15 and 16 GeV/c π in the incoherent reactions πA → π+πA’ and πA → π+ππ0A’ on nuclei of C2F5Cl in a HLBC. Using these results and a nuclear-interaction model, the production cross-sections of these resonances in the corresponding reactions on protons,i.e. πp → ρ0n, πp → f0n and πp → ω0n, are calculated as a function of the absorption cross-section of the produced resonance in nuclear matter. Difficulties in separating those reactions from other sources of ρ0, etc., in nuclear reactions are discussed.

Riassunto

Si presentano le sezioni d’urto parziali per la produzione di ρ0, f0 ed ω0 da parte di π di 15 e 16 GeV/c nelle reazioni incoerenti πA → π+πA’ e πA → π+ππ0A’ su nuclei di C2F5Cl in una camera a bolle ad elio liquido. Per mezzo di questi risultati e di un modello di interazione nucleare, si calcolano le sezioni d’urto di produzione di queste risonanze nelle corrispondenti reazioni su protoni, cioè πp → ρ0n, πp → f0n e πp → ω0n, in funzione della sezione d’urto di assorbimento della risonanza prodotta nella materia nucleare. Si discutono le difficoltà di separare queste reazioni dalle altre sorgenti di ρ0, ecc., nelle reazioni nucleari.

Реэюме

Предлагаются парциальные поперечные сечения рождения π0, f0 и ω0 отрицательными π-меэонами с импульсами 15 и 16 ГзВ/с в некогерентных реакциях π-А → π+π-А’ и π-А → π+π-πА’ на ядрах С2Г5С1 в пуэырьковой камере с тяжелой жидкостью. Испольэуя зти реэультаты и модель ядерных вэаимодействий, вычисляются поперечные сечения рождения зтих реэонансов в соответствуюших реакциях на протонах: π-р → ρ0n, π-р → fоп и π-р → ω0п, как функция поперечного сечения поглошения рожденного реэонанса в ядерном вешестве. Обсуждаются трудности при отделении зтих реакций от других усточников ρ0, f0 и ω0 в ядерных реакциях.

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References

  1. A. S. Goldhaber, C. J. Joachain, H. J. Lubatti andJ. J. Veillet:Phys. Rev. Lett.,22, 802 (1969).

    Article  ADS  Google Scholar 

  2. K. S. Kolbig andB. Margolis:Nucl. Phys.,6 B, 85 (1968);A. S. Goldhaber andC. J. Joachain:Phys. Rev.,171, 1566 (1968). See also ref. (3) and references cited in these papers.

    Article  ADS  Google Scholar 

  3. G. Von Bochmann, B. Margolis andC. L. Tang:Phys. Lett.,30 B, 254 (1969).

    Article  ADS  Google Scholar 

  4. H. Alvensleben, U. Becker, W. K. Bertram, M. Chen, K. J. Cohen, T. M. Knasel, R. Marshall, D. J. Quinn, M. Rohde, G. H. Sanders, H. Schubel andS. C. C. Ting:Phys. Rev. Lett.,24, 786, 792 (1970).

    Article  ADS  Google Scholar 

  5. M. Davier, J. Derado, D. Drikey, D. Fries, R. Mozley, A. Odian, F. Villa andD. Yount:Phys. Lett.,28 B, 619 (1969);G. McClellan, N. Mistry, P. Mostek, H. Ooren, A. Silverman, J. Swartz, R. Talman, K. Gottfried andA. J. Lebedev:Phys. Rev. Lett.,22, 374 (1969);F. Bulos, W. Busza, R. Giese, R. R. Larsen, D. W. G. S. Leith, B. Richter, V. Perez-Mendez, A. Stetz, S. H. Williams, M. Beniston andJ. Rettberg:Phys. Rev. Lett.,22, 490 (1969);H.-J. Behrend, F. Lobkowicz, E. H. Thorndike andA. A. Wehmann:Phys. Rev. Lett.,24, 336 (1970);H.-J. Behrend, F. Lobkowicz, E. H. Thorndike, A. A. Wehmann andM. E. Nordberg jr.:Phys. Rev. Lett.,24, 1246 (1970).

    Article  ADS  Google Scholar 

  6. G. McClellan, N. Mistry, P. Mostek, H. Ogren, A. Osborne, A. Silverman, J. Swartz, R. Talman andG. Diambrini-Palazzi:Phys. Rev. Lett.,23, 554 (1969).

    Article  ADS  Google Scholar 

  7. G. Bellini, B. Daugeras, D. Fournier, J. Hennessy, A. Lloret, H. J. Lubatti, J. Six, J. J. Veillet, M. di Corato, E. Fiorini, K. Moriyasu, P. Negro, M. Rollier, H. H. Bingham, B. Equer, C. W. Farwell andW. B. Fretter:Nuovo Cimento,53 A, 798 (1968). The 16 GeV meson cross-sections given in this reference are superseded by the present results.

    Article  MATH  ADS  Google Scholar 

  8. J. Ballam, G. B. Chadwick, Z. G. T. Guiragossian, W. B. Johnson, D. W. G. S. Leith andK. Moriyasu:Phys. Lett.,31 B, 489 (1970), quote σρ=(52±13) μb,\(\sigma _{f^0 } = (38 \pm 9)\) μb compared with OPE prediction of 51 and 43 µb, respectively.

    Article  MATH  ADS  Google Scholar 

  9. R. Hönecker, B. Junkmann, R. Schulte, R. Steinberg, N. Tsanos, J. Klugow, S. Nowak, E. Ryseck, M. Walter, K. Böckmann, H. Drevermann, K. Sternberger, B. Wagini, W. Johnssen, H. Böttcher, V. T. Cocconi, J. D. Hansen, G. Kellner, D. R. O. Morrison, K. Paler, A. Mihul, V. Moskalev, T. Coghen, O. Czyzewski, K. Eskreys, J. Łoskiewicz, J. Zaorska, S. Brandt, O. Braut, V. Lüth, T. P. Shah, H. Wenninger, M. Bardadin-Otwinowska, T. Hofmokl, L. Michejda, S. Otwinowski, R. Sosnowski, M. Szeptycka, W. Wójcik andA. Wróblewski:Nucl. Phys.,13 B, 571 (1969);D. R. O. Morrison: private communication.

    Article  ADS  Google Scholar 

  10. The residual feed-down background should be larger for the ρ0 than for the f0 because the ρ/f ratio in the most likely feed-down source reactions (16) is 3/1 to 6/1. This background should be larger among events showing clear evidence of nuclear break-up,i.e. identified protons in addition to the meson prongs, than it is in «clean» events, because feed-down events need a second interaction in the nucleus to eliminate the extra pion, convert theN*, etc.. Thus comparison of the ρ/f ratios in clean and break-up events gives information on this feed-down background. Unfortunately, our statistics do not permit a precise estimate of it by this method.

  11. As estimated from our data on reaction II), also on final states π+ππ N, π+ππp. For coherent produced (3π) states (17), ρ/f ≈ 20:1.J. Ballam, A. D. Brody, G. B. Chadwick, D. Fries, Z. G. T. Guiragossián, W. B. Johnson, R. R. Larsen, D. W. G. S. Leith, F. Martin, M. Perl, E. Pickup andT. H. Tan:Phys. Rev. Lett.,21, 934 (1968), Slac Pub/334/Aug. 1967 (and private communication) find ρ0πp/f0πp = =0.49/0.08 at 16 GeV, while ρ0π+p/f0π+p=0.41/0.14=ρ0πn/f0πn. See also ref. (14).

    Article  ADS  Google Scholar 

  12. J. F. Allard, D. Drijard, J. Hennessy, R. Huson, A. Lloret, J. Six, J. J. Veillet, G. Bellini, M. di Corato, E. Fiorini, P. Negri, M. Rollier, J. Crussard, J. Ginestet, A. Tran, H. H. Bingham, C. Farwell, W. B. Fretter, H. J. Lubatti andK. Moriyasu:Nuovo Cimento,46 A, 737 (1966).

    Article  ADS  Google Scholar 

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To speed up publication, the authors of this paper have agreed to not receive the proofs for correction.

CERN visiting scientist 1970.

Work supported in part by National Science Foundation Grants GP-6032 and GP-9356.

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Daugeras, B., Fournier, D., Grivaz, J.F. et al. ρ0, f0, ω0 production on nuclei and protons by 15, 16 GeV/c π . Nuov Cim A 2, 237–248 (1971). https://doi.org/10.1007/BF02723999

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  • DOI: https://doi.org/10.1007/BF02723999

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