Study of hadronic event shape in flavour tagged events in e+e- annihilation at 〈 s 〉 = 197 GeV

PMC Physics A

Table 9 Comparison of different parton shower models with the data at $〈 \sqrt{s} 〉$ = 197 GeV for all events, non-b events and b events for the six event-shape variables.

Event Sample	Model		T	ρ _H	B _T	B _W	C	$y_{23}^{J}$
All events	JETSET	χ²/d.o.f.	7.7/12	6.9/14	10.2/15	7.4/15	10.4/14	9.7/15
		C.L.	0.74	0.91	0.75	0.92	0.66	0.79
	HERWIG	χ²/d.o.f.	9.0/12	8.5/14	10.1/15	9.9/15	14.9/14	9.7/15
		C.L.	0.62	0.81	0.75	0.77	0.32	0.78
	ARIADNE	χ²/d.o.f.	6.9/12	7.6/14	6.4/15	9.0/15	12.5/14	9.7/15
		C.L.	0.80	0.87	0.95	0.83	0.48	0.78
Non-b events	JETSET	χ²/d.o.f.	15.1/12	12.3/14	20.1/15	17.5/15	16.8/14	12.6/15
		C.L.	0.18	0.50	0.13	0.23	0.21	0.56
	HERWIG	χ²/d.o.f.	15.1/12	12.3/14	20.1/15	20.5/15	17.0/14	12.3/15
		C.L.	0.18	0.50	0.13	0.11	0.20	0.58
	ARIADNE	χ²/d.o.f.	13.4/12	12.9/14	16.1/15	19.7/15	14.8/14	10.3/15
		C.L.	0.27	0.46	0.31	0.14	0.32	0.74
b events	JETSET	χ²/d.o.f.	11.1/9	11.6/13	12.8/13	11.8/14	12.5/12	12.1/14
		C.L.	0.20	0.48	0.38	0.55	0.33	0.52
	HERWIG	χ²/d.o.f.	11.5/9	10.6/13	14.5/13	13.7/14	11.0/12	11.9/14
		C.L.	0.18	0.56	0.27	0.40	0.45	0.54
	ARIADNE	χ²/d.o.f.	10.0/9	11.0/13	13.6/13	13.4/14	10.7/12	10.1/14
		C.L.	0.27	0.53	0.32	0.42	0.47	0.68

The χ² over the numbers of degrees of freedom (d.o.f.) and the confidence levels are shown.