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Measurement of the partial width of the decay of the Z0 into charm quark pairs

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Measurement of the partial width of the decay of the Z0 into charm quark pairs

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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

A determination of the partial width Γcc̄ of the Z0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc̄ events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson D∗+→D0π+ and D∗−→D̄0 π− where the π± is constrained by kinematics to have a low pT with respect to the axis. The probability to produce these π± from D∗± decay in cc̄ events is taken to be 0.31 ±_0.05 as measured at √s=10.55 GeV. The measured relative partial width Γcc̄Γh = 0.162± 0.030 (stat.) ±0.050 (syst.) is in good agreement with the standard moel value of 0.171. Together with our previous measurement of the total hadronic width Γh this implies Γcc̄ = 282±53 (stat.)±88(syst.) MeV.

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