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Energy-energy correlations in hadronic final states from Z0 decays

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Energy-energy correlations in hadronic final states from Z0 decays

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DELPHI Collaboration; Allen, Paul; Alted Abad, Francesc Josep; Benlloch Baviera, José María; Castillo Giménez, María Victoria; Contreras González, José Luis; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; Fez Laso, M. D. M. de; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Lozano Bahilo, José Julio; Llosá Reig, Rafael; Sanchis Peris, Enrique; Sebastiá Cortés, Angel; Sánchez Rojo, María Ester; Sánchez Martínez, Javier; Valls Ferrer, Juan Antonio; Velasco González, Jorge; Zúñiga Román, Juan

Aquest document és un/a article, creat/da en: 1990

We have studied the energy-energy angular correlations in hadronic final states from Z 0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ (5) MS =104 +25 -20 ( stat. ) +25 -20( syst. ) +30 00 ) theor. ) . MeV, which corresponds to α s (91 GeV)=0.106±0.003(stat.)±0.003(syst.) +0.003 -0.000 (theor). The theoretical error stems from different choices for the renormalization scale of α s . In the Monte Carlo simulation the scale of α s as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.

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