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2024年10月30日

Poisson-Like Shape and Shoulder Structure of Hadron Multiplicity Distributions in e+e Annihilation at Z0 Energy Region

  • The charged multiplicity distributions of hadron final states in the e+e annihilation at the 91.2 GeV Z0 energy region are fitted with Poisson shape in different rapidity windows for double and single hemisphere. The multiplicities which are in Poisson-like shapes can be got according to the parameter /D and fitting qualities are compared with the results derived from the relevant theoretical models.The relationship between the Poisson-like shape and KNO scaling is discussed. The connection between the parameters expressing the deviation from the Poisson shape and non-independent particle emission and multiplicity correlation strength is analyzed. The "shoulder structure" is observed in the central rapidity region and analyzed with multi-jets by using the JADE jet analysis algorithm.
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  • [1] D.Decampetal,ALEPH Collaboration,Phys.Lett,B273(1991)181;P.Abreuetal,DELPHI Collabiration,Z.Physics,C50(1990)185.[2]T.T.ChouandC.N.Yang,Phys.Lett.B167(1986)453;Phys Rev.Lett.,55(1985)1359;Phys.Lett,B193(1987)531.[3]T.T.ChouandC.N.Yang,Proceeding of 25th International Conferenceon High Energy Physics(Singapore,1991),Vol.2,p1013.[4]A.Capellaetal,Phys.Rev.,D37(1988)1763.[5]P.Abreuetal,DELPHI Collaboration,Z.Phys.,C52(1991)271.[6]D.Decampetal,ALEPH Collaboration,Nucl.Inst.Meth,A294(1990)121.[7]D.Decampetal,ALEPH Collaboration,Phys.Lett.,B234(1990)209.[8]A.Wroblewski.Acta Phys.Pol,B4(1974)857.[9]S.Barshay,(internal paper of Ⅲ Physikalisches Institut Technische Hochsckule Aachen,Germany),Possibility of Observable New Behavier for Multiparticle Production in e+e- Annihilation at LEP.[10]A.Giovannini et al,XXI International Symposiumon Multiparticle Dynamics(1991),Wuhan,China,p285.[11]W.Braunschweig et al,TASSO Collaboration,Z.Phys.,C45(1989)193.[12]Yi-GangXieetal,ALEPH Collaboration,XXI International Symposiumon Multiparticle Dynamic(1991), Wuhan, China, p172 [13]P.Abreu et al., DELPHI Collaboration, Z. Phys., C56(1992)63.[14]W.Bartel et al., JADE Collaboration, Z. Phys., C33(1986)23.
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Get Citation
Xie Yigang and Chai Yong. Poisson-Like Shape and Shoulder Structure of Hadron Multiplicity Distributions in e+e Annihilation at Z0 Energy Region[J]. Chinese Physics C, 1994, 18(9): 778-787.
Xie Yigang and Chai Yong. Poisson-Like Shape and Shoulder Structure of Hadron Multiplicity Distributions in e+e Annihilation at Z0 Energy Region[J]. Chinese Physics C, 1994, 18(9): 778-787. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Poisson-Like Shape and Shoulder Structure of Hadron Multiplicity Distributions in e+e Annihilation at Z0 Energy Region

    Corresponding author: Xie Yigang,
  • Institute of High Energy Physics, Academia Sinica, Beijing 100039

Abstract: The charged multiplicity distributions of hadron final states in the e+e annihilation at the 91.2 GeV Z0 energy region are fitted with Poisson shape in different rapidity windows for double and single hemisphere. The multiplicities which are in Poisson-like shapes can be got according to the parameter /D and fitting qualities are compared with the results derived from the relevant theoretical models.The relationship between the Poisson-like shape and KNO scaling is discussed. The connection between the parameters expressing the deviation from the Poisson shape and non-independent particle emission and multiplicity correlation strength is analyzed. The "shoulder structure" is observed in the central rapidity region and analyzed with multi-jets by using the JADE jet analysis algorithm.

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