hi,
i checked in the fixes to v2, and also b2_17 and b2_18 bugfix
branches. i am currently making new ntuples for runs 3063-3109 with the
fixed version 2_18 to test the improvement in resolution.
--chris
Douglas Hasell wrote:
> Hi,
>
> Aaron has pointed out an error in the time to position algorithm.
>
> In order to simplify the algorithm I parameterized the time to
> position relationship for super-layer=0 and then used symmetry
> arguments to use the same parameterization for super-layer=1.
> However, I forgot to flip one symmetry axis.
>
> So, somewhere in the code (Tong took the code I sent him and
> changed it to conform to whatever conventions you are using) there
> should be something like this:
>
> float WC_pos_vs_t( int wire, int super, float theta, float bfield, int
> pm,
> float t ) {
>
> ...
> ...
> ...
>
> // If this is superlayer 1 reverse the wire number and field.
>
> if( super == 1 ) {
> wire = 2 - wire;
> bfield = - bfield;
> }
>
> The above lines (or equivalent after Tong changed things)
> should also reverse the track angle and look something like this:
>
> // If this is superlayer 1 reverse the wire number, track angle and
> field.
>
> if( super == 1 ) {
> wire = 2 - wire;
> theta = -theta
> bfield = -bfield;
> }
>
> Could someone please change this in the appropriate place since
> Tong is away and let everyone know when it is changed? Thanks.
>
> Also, Chris, its probably worthwhile redoing the ep analysis as
> this will change things.
>
> Cheers,
> Douglas
>
> 26-415 M.I.T. Tel: +1 617 258 7199
> 77 Massachusetts Avenue Fax: +1 617 258 5440
> Cambridge, MA 02139, USA E-mail: hasell@mit.edu
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