Measurement of event shape and inclusive distributions at √s = 130 and 136 GeV
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Measurement of event shape and inclusive distributions at √s = 130 and 136 GeV

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Measurement of event shape and inclusive distributions at √s = 130 and 136 GeV

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DELPHI Collaboration; Ferrer Soria, Antonio Perfil; Higón Rodríguez, Emilio Perfil; Castillo Giménez, María Victoria Perfil; García García, Carmen Perfil; Martínez Vidal, Fernando Perfil; Hernández Rey, Juan José Perfil; Fuster Verdú, Juan A. Perfil; Salt Cairols, José Perfil; Lacasta Llácer, Carlos
Aquest document és un/a article, creat/da en: 1997

Este documento está disponible también en : http://dx.doi.org/10.1007/s002880050312
Inclusive charged particle and event shape distributions are measured using 321 hadronic events collected with the DELPHI experiment at LEP at effective centre of mass energies of 130 to 136 GeV. These distributions are presented and compared to data at lower energies, in particular to the precise Z data. Fragmentation models describe the observed changes of the distributions well. The energy dependence of the means of the event shape variables can also be described using second order QCD plus power terms. A method independent of fragmentation model corrections is used to determine as\alpha_s from the energy dependence of the mean thrust and heavy jet mass. It is measured to be: \[ \alpha_s(133\mbox{ GeV}) = 0.116 \pm 0.007_{exp} {^{+0.005}_{-0.004}}_{theo} \] from the high energy data.

    DELPHI Collaboration (Abreu, P. Ferrer Soria, Antonio Higón Rodríguez, Emilio Castillo Giménez, María Victoria García García, Carmen Martínez Vidal, Fernando Hernández Rey, Juan José Fuster Verdú, Juan A. Salt Cairols, José Lacasta Llácer, Carlos 1997 Measurement of event shape and inclusive distributions at √s = 130 and 136 GeV Zeitschrift für Physik C-Particles and Fields 73 2 229 242
http://dx.doi.org/10.1007/s002880050312
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