Re: more on cross section systematic errors

Daniele Martello (martello@le.infn.it)
Wed, 04 Nov 1998 10:57:17 +0100

>
> Regarding Daniele's excellent work on cross section uncertainties, I
> am very troubled by the low chi-squares he obtains fitting
> experimental data (chi-square is 4 or 5 with 17 degrees of freedom in
> the high energy case). This could occur either because the
> experiments overestimated their errors, or (more likely I think)
> because the points at different energies share a common systematic
> error.

Yes, you are right. Some of the experimantal sets of data that I have
use have a common systematic error. Now, I am traing to write a more
complex version of the chi_square function that take in account the
correlation inside each sets of experimental data.
New results soon.

Best Reagards
Daniele

-- 
                   Daniele Martello           
Phone:    +39-(0)832-320-443 (Fax +39-(0)832-325128)
Address:  INFN Sez. Lecce,  via per Arnesano, I-73100 Lecce (Italy)
e-mail:   martello@le.infn.it