Hi Bjorn et al, On Wed, 8 Nov 2000 13:34:35 -0500 (EST) Bjorn H Samset <bjornhs@rcf.rhic.bnl.gov> wrote concerning ": Re: Vertex": > Yes, but this is not necesearily meant to last. The module was actually > "released" a bit prematurely since this part is not really ready, but I > did it to make resolution-investigations etc. a bit easier. I realise that the vertex algorithms is are work in progress, and ofcourse the "goodness" criteria will evolve as further work is put into it. My previous mail in this thread was merely an attempt to get some discussion going on how to determine the "best" vertex in a given event. > 1) The ZDC's have a resolution sigma of 7-9 cm. This is so wide that it > would kill any fine res. needed esp. for PID in FS. I had a short discussion with Ian yesterday, over which I realiased that I probably wasn't clear enough on what I meant with "weighted mean". What I imagine one could do, was to assign some "confidence factor" to each of the four algorithms, ofcourse based on scrutinising investigations, and the "best" vertex could be some linear combination of the found verticies. In the extreem limit, this confidence factor is just a cut. Of course, as Bjorn points out, the correlation of the vertex found by the cluster and the track algorithm, needs to be addressed. > I have been looking through the output from BrTPMClusterVertexModule > today, and I believe I can easily remove at least part of this by > using one or two more internal cuts in the module Please PLEASE document these cuts, and allow the user to change them. As a general comment, I'd like to direct peoples attention to the nice features for documenting your class directly in the code, as provided by the THtml class in ROOT. What I do, is to prepare some document in LaTeX (so that I may have fancy maths stuff in it), and then translate that into HTML using LaTeX2HTML. This document I past into the source code: //___________________________________________________________________ //Begin_Html /* </pre> <!-- needed since we're inside a <pre> block --> <!-- Here goes the HTML document from LaTeX2HTML --> <pre> <!-- back to the <pre> block --> */ //End_Html You'll probably have to include some GIFs in your document, for maths and the like. These could be added to the CVS repository in a common "gif" directory. Again, I'd like to urge someone at BNL to regularly update the HTML pages. I can do it froim here, but since you need an X connection to do it, it would be more sensible for someone with a high-speed X connection (i.e., not across the atlantic via SSH) to do that. In ~brahmlib/bin/ (I can't remember the name) I put a script that'll semi-automate the process. A few liras(!) worth. Yours, Christian ----------------------------------------------------------- Holm Christensen Phone: (+45) 35 35 96 91 Sankt Hansgade 23, 1. th. Office: (+45) 353 25 305 DK-2200 Copenhagen N Web: www.nbi.dk/~cholm Denmark Email: cholm@nbi.dk
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