A measurement of the b¯b forward-backward asymmetry using the semileptonic decay into muons
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A measurement of the b¯b forward-backward asymmetry using the semileptonic decay into muons

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A measurement of the b¯b forward-backward asymmetry using the semileptonic decay into muons

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DELPHI Collaboration; Allen, Paul; Benlloch Baviera, José María; Castillo Giménez, María Victoria Perfil; Fez Laso, M. D. M. de; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gómez Cadenas, Juan José Perfil; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Lozano Bahilo, José Julio; Lacasta Llácer, Carlos; Martí García, Salvador; Llosá Reig, Rafael; Sánchez Rojo, María Ester; Salt Cairols, José Perfil; Valls Ferrer, Juan Antonio; Zúñiga Román, Juan
Aquest document és un/a article, creat/da en: 1992
The forward-backward asymmetry of bottom quarks is measured with statistics of approximately 80 000 hadronic Z0 decays produced in e+e- collisions at a centre of mass energy of square-root s almost-equal-to M(z). The tagging of b quark events has been performed using the semileptonic decay channel b --> X + mu. Because the asymmetry depends on the weak coupling, this leads to a precise measurement of the electroweak mixing angle sin2 theta(w). The experimental result is A(FB)b = 0.115 +/- 0.043(stat.) +/- 0.013(syst.). After correcting the value for the B0B0BAR mixing this becomes A(FB)b = 0.161 +/- 0.060(stat.) +/- 0.021 (syst.) corresponding to sin2 theta(w)MSBAR = 0.221 +/- 0.011 (stat.) +/- 0.004 (syst.).

    DELPHI Collaboration Allen, Paul Benlloch Baviera, José María Castillo Giménez, María Victoria Fez Laso, M. D. M. de Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gómez Cadenas, Juan José Hernández Rey, Juan José Higón Rodríguez, Emilio Lozano Bahilo, José Julio Lacasta Llácer, Carlos Martí García, Salvador Llosá Reig, Rafael Sánchez Rojo, María Ester Salt Cairols, José Valls Ferrer, Juan Antonio Zúñiga Román, Juan 1992 A measurement of the b¯b forward-backward asymmetry using the semileptonic decay into muons Physics Letters B 276 4 536 546
http://dx.doi.org/10.1016/0370-2693(92)91680-8
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