About three million hadronic decays of the Z collected by ALEPH in the years 1991 to 1994 are used to search for anomalous Cp violation beyond the Standard Model in the decay Z-->b(b) over barg$. The study is performed by analyzing angular correlations between the two quarks and the gluon in three-jet events and by measuring the differential two-jet rate. No signal of CP violation is found. For the combinations of anomalous CP violating couplings, (h) over cap(b)$=<(h)over cap (Ab)g(Vb)>-<(h)over cap (Vb)g(Ab)> and h(b)*=root<(h)over cap (2)(Vb)>+<(h)over cap (2)(Ab)>, limits of \(h) over cap(b)$\<0.59 and h(b)*<3.02 are given at 95% CL. RI ANTONELLI, ANTONELLA/C-6238-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; St.Denis, Richard/C-8997-2012; Sanchez, Federico/F-5809-2012; Forti, Francesco/H-3035-2011; Ferrante, Isidoro/F-1017-2012
Search for CP violation in the decay Z->b(b)over-bar-g
Rolandi L;LIGABUE, FRANCO;LUSIANI, Alberto;
1996
Abstract
About three million hadronic decays of the Z collected by ALEPH in the years 1991 to 1994 are used to search for anomalous Cp violation beyond the Standard Model in the decay Z-->b(b) over barg$. The study is performed by analyzing angular correlations between the two quarks and the gluon in three-jet events and by measuring the differential two-jet rate. No signal of CP violation is found. For the combinations of anomalous CP violating couplings, (h) over cap(b)$=<(h)over cap (Ab)g(Vb)>-<(h)over cap (Vb)g(Ab)> and h(b)*=root<(h)over cap (2)(Vb)>+<(h)over cap (2)(Ab)>, limits of \(h) over cap(b)$\<0.59 and h(b)*<3.02 are given at 95% CL. RI ANTONELLI, ANTONELLA/C-6238-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; St.Denis, Richard/C-8997-2012; Sanchez, Federico/F-5809-2012; Forti, Francesco/H-3035-2011; Ferrante, Isidoro/F-1017-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
