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Charged multiplicity distributions in rapidity bins for pp collisions at\(\sqrt s = 31\), 44 and 62 GeV, 44 and 62 GeV

Распределение зарядов ой множественности в интервалах быстроты для рр соударений при\(\sqrt s = 31.44\) и 62 ГэВи 62 ГэВ

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Il Nuovo Cimento A (1965-1970)

Summary

The multiplicity distributions of charged secondaries in proton-proton interactions at\(\sqrt s = 31\), 44 and 62 GeV have been measured with high statistics using the split field magnet (SFM) detector at the CERN ISR. The multiplicity distributions for narrow bins in rapidity depend on the rapidity variable. The validity of KNO scaling is discussed. The negative binomial function fits well the charged and negative multiplicity data for full phase space and for central rapidity windows. The energy and the rapidity dependence of the negative binomial parameters,\(\bar n\) andk, are presented. We also analyse their implications for a cascade model in terms of the average number of «clans» and of the average number of particles per «clan».

Riassunto

Le distribuzioni in molteplicità delle particelle cariche prodotte nelle interazioni protone-protone a\(\sqrt s = 31\), 44 e 62 GeV sono state misurate con alta statistica utilizzando il rivelatore split field magnet (SFM) agli ISR del CERN. Le distribuzioni in molteplicità relative a piccoli intervalli in rapidità dipendono dalla variabile rapidità. Viene discussa la validità dello scaling KNO. La funzione binomiale negativa rappresenta bene i dati sulle distribuzioni in molteplicità per tutte le particelle cariche e per quelle negative sia su tutto lo spazio delle fasi che per finestre centrali in rapidità. Vengono presentati la dipendenza in energia e in rapidità dei parametri\(\bar n\) ek della funzione binomiale negativa. Vengono analizzate le implicazioni per un modello di produzione in cascata del numero medio di «clans» e del numero medio di particelle per «clan».

Резюме

Были измерены распределения множественности заряженных вторичных частиц в протон-протонных взаимодействиях при\(\sqrt s = 31.44\) и 62 ГэВ с высокой статистикой, используя SFM-детектор в ЦЕРНе. Распределение множественности в узких интервалах быстроты зависят от переменной быстроты. Обсуждается справедливости KNO-склейнинга. Функция в виде отрицательного бинома хорошо описывает данные по множественности для всего фазового пространства и для центральных окон быстроты. Приводится зависимость параметров отрицательного бинома,\(\bar n\) и K, от энергии и быстроты. Мы также анализируем применимость полученных результатов для каскадной модели в терминах среднего числа «кланов» и среднего числа частиц в «клане».

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Author information

Author notes

  1. A. Breakstone

    Present address: University of Hawaii, USA

  2. H. Frehse

    Present address: CDC, Zürich, Switzerland

  3. W. Geist

    Present address: Lawrence Berkeley Lab., Berkeley, California, USA

  4. M. Heiden

    Present address: DEC, Kaufbeuren, Germany

  5. T. Lohse

    Present address: SLAC, Stanford, USA

  6. R. Yeung

    Present address: University of California, Los Angeles, USA

  7. M. Schmelling

    Present address: University of Mainz, Germany

  8. T. Nakada

    Present address: SIN, Villigen, Switzerland

Authors and Affiliations

  1. Ames Laboratory and Physics Department, Iowa State University, Ames, USA

    A. Breakstone, H. B. Crawley, A. Firestone, M. Gorbics, D. Isenhower, J. W. Lamsa & W. T. Meyer

  2. Dipartimento di Fisica dell’Università, Bologna

    R. Campanini, M. Cuffiani, M. M. Deninno, F. Fabbri, G. Giacomelli, S. Marcellini, B. Poli, F. Rimondi & G. P. Siroli

  3. INFN, Sezione di Bologna, Bologna, Italia

    R. Campanini, M. Cuffiani, M. M. Deninno, F. Fabbri, G. Giacomelli, S. Marcellini, B. Poli, F. Rimondi & G. P. Siroli

  4. CERN, European Organization for Nuclear Research, Geneva, Switzerland

    G. M. Dallavalle, K. Doroba, D. Drijard, H. G. Fischer, H. Frehse, W. Geist, M. Gorski, M. Heiden, W. Herr, T. Lohse, O. Ullaland & R. Yeung

  5. Institut für Physik der Universität, Dortmund, Germany

    R. Mankel, K. Rauschnabel, M. Schmelling & D. Wegener

  6. Institut für Hochenergiephysik der Universität, Heidelberg, Germany

    H. Flöge, L. Gesswein, P. Hanke, E. E. Kluge, T. Nakada, M. Panter, A. Putzer, B. Rensch & M. Wunsch

  7. University and Institute for Nuclear Studies, Warsaw, Poland

    R. Gokieli, R. Sosnowski & M. Szczekowski

Authors
  1. A. Breakstone
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  2. H. B. Crawley
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  7. W. T. Meyer
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  8. R. Campanini
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  17. G. M. Dallavalle
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  18. K. Doroba
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  22. W. Geist
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  23. M. Gorski
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  24. M. Heiden
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  25. W. Herr
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  26. T. Lohse
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  27. O. Ullaland
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  28. R. Yeung
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  29. R. Mankel
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  30. K. Rauschnabel
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  31. M. Schmelling
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  32. D. Wegener
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  33. H. Flöge
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  34. L. Gesswein
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  35. P. Hanke
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  36. E. E. Kluge
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  37. T. Nakada
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  38. M. Panter
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  39. A. Putzer
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  40. B. Rensch
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  41. M. Wunsch
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  42. R. Gokieli
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  43. R. Sosnowski
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  44. M. Szczekowski
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Breakstone, A., Crawley, H.B., Firestone, A. et al. Charged multiplicity distributions in rapidity bins for pp collisions at\(\sqrt s = 31\), 44 and 62 GeV, 44 and 62 GeV. Nuov Cim A 102, 1199–1222 (1989). https://doi.org/10.1007/BF02800332

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  • DOI: https://doi.org/10.1007/BF02800332

PACS 13.85.Hd

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