Re: [Brahms-dev-l] MRS acceptance maps

  Hi,

  I definitely subscribe to what Flemming said. The most important 
thing is to have the same cuts on both data and acceptance maps. 
Otherwise, you can easily end up by anywhere in 10-20% off.

  Truls' idea in the generate maps is to use as default the sizes of 
the volumes, on both x and y directions. Due to some problems on the 
back of TPM2, I had to use for AuAu data an additional cut on back 
TPM2 plane of x in [-18, 22]. This I've extracted by looking on high 
statistics data, and compare the overlap between the acceptance and 
real data.
  This problem went away for the run5.
  
  The slat cuts in TOF are done to ensure that the last volume is 
always imposing the actual fiducial cut. Since we have the TOFW slats 
calibrated from 32-113, I'm using this slat range for the maps. There 
are also fewer hits outside this range. In the TFW2, this corresponds 
to 3-38, as Flemming showed along the time.

  Last thing is related to magnet fiducial cuts. As you've seen, for 
D5 it is 1 cm on x. I don't see any problems in the MRS, as long as 
the track matchings are fine - I think this was the original idea, to 
have 1 cm in volume cut for magnets.

Kind regards,
Catalin.

On Tuesday 01 May 2007 21:45, Flemming Videbaek wrote:
> Hi,
> it would be nice if there was a unique answer, but it really
> depends on a) the run preiod, b) how you do efficiencies, and what
> fiducial detector you use i.e. tofw, tfw2 and what slat range. At
> some level as long you make the identical cuts in the analysis
> there should not be a problem.
>
> i) TPM1: As I said in my analysi note front cuts of
> -18.72<xFront<18.72 is ok. The y does not matter (as long it is big
>    enough) ii) TPM2 ; I use defaults but I think Catalin and Truls
> has restricted range. iii) TOFW; kris likes 40<=slat<=100+; but
> does depend on active slats iv)  TFW2: for 90 deg you must use
> 3<=slat<=37 otherwise the trigger does not match, but if there are
> many dead slats between say 3 and 8 which I know of (I think 8 is
> always dead) you should use a smaller range. Again I tried to lay
> this out in the note.
>
> hopefull Truls+Catalin witll tune in on this.
>
> Flemming
>
>
>
>
> --------------------------------------------
> Flemming Videbaek
> Physics Department
> Bldg 510-D
> Brookhaven National Laboratory
> Upton, NY11973
>
> phone: 631-344-4106
> cell:       631-681-1596
> fax:        631-344-1334
> e-mail: videbaek @ bnl gov
> ----- Original Message -----
> From: "Bekele, Selemon" <bekeleku_at_ku.edu>
> To: <brahms-dev-l_at_lists.bnl.gov>
> Sent: Tuesday, May 01, 2007 2:59 PM
> Subject: [Brahms-dev-l] MRS acceptance maps
>
> > Hi,
> >
> >   I am trying to make acceptance maps for the MRS.
> > I see the following default values for the fiducial cuts.
> > if I run with the defaults
> > ==================
> >  TPM1 fiducial cuts,
> >
> > Front X:[-19.2, 19.2] Y:[-10, 10]
> > Back  X:[-19.2, 19.2] Y:[-10, 10]
> >
> >  TPM2 fiducial cuts,
> >
> > Front X:[-33.84, 33.84] Y:[-9.9, 9.9]
> > Back  X:[-33.84, 33.84] Y:[-9.9, 9.9]
> >
> >  D5 fiducial cuts: X=1 Y=0
> > ===================
> > On the other hand, I see the following commented values in
> > "generateMAps.cxx". Are they suggested values for what fiducial
> > cuts should be? It takes a long time to get the maps with a 2%
> > error and I really do not have the time to experiment with this
> > values. It would be of great help and save me time if people who
> > have generated MRS maps comment on it.
> >
> > ===================
> >  new BrAppFloatOption('\0', "TPM1-fidflowX", "Lowest acceptable X
> > on front of TPM1", -1111); // -18.2); new BrAppFloatOption('\0',
> > "TPM1-fidfhiX", "Highest acceptable X on front of TPM1",  -1111);
> > //  18.2); new BrAppFloatOption('\0', "TPM1-fidflowY", "Lowest
> > acceptable Y on front of TPM1", -1111); new
> > BrAppFloatOption('\0', "TPM1-fidfhiY", "Highest acceptable Y on
> > front of TPM1",  -1111); new BrAppFloatOption('\0',
> > "TPM1-fidblowX", "Lowest acceptable X on back of TPM1",  -1111);
> > // -18.2); new BrAppFloatOption('\0', "TPM1-fidbhiX", "Highest
> > acceptable X on back of TPM1",   -1111); //  18.2); new
> > BrAppFloatOption('\0', "TPM1-fidblowY", "Lowest acceptable Y on
> > back of TPM1",  -1111); new BrAppFloatOption('\0',
> > "TPM1-fidbhiY", "Highest acceptable Y on back of TPM1",   -1111);
> >
> >  new BrAppFloatOption('\0', "D5-fidX", "Closest acceptable
> > distance to D5 magnet walls in X", 1); // 1); new
> > BrAppFloatOption('\0', "D5-fidY", "Closest acceptable distance to
> > D5 magnet walls in Y", 0); // 1);
> >
> >  new BrAppFloatOption('\0', "TPM2-fidflowX", "Lowest acceptable X
> > on front of TPM2", -1111); // -17.8); new BrAppFloatOption('\0',
> > "TPM2-fidfhiX", "Highest acceptable X on front of TPM2",  -1111);
> > //  18.8); new BrAppFloatOption('\0', "TPM2-fidflowY", "Lowest
> > acceptable Y on front of TPM2", -1111); new
> > BrAppFloatOption('\0', "TPM2-fidfhiY", "Highest acceptable Y on
> > front of TPM2",  -1111); new BrAppFloatOption('\0',
> > "TPM2-fidblowX", "Lowest acceptable X on back of TPM2",  -1111);
> > // -26.0); new BrAppFloatOption('\0', "TPM2-fidbhiX", "Highest
> > acceptable X on back of TPM2",   -1111); //  28.0); new
> > BrAppFloatOption('\0', "TPM2-fidblowY", "Lowest acceptable Y on
> > back of TPM2",  -1111); new BrAppFloatOption('\0',
> > "TPM2-fidbhiY", "Highest acceptable Y on back of TPM2",   -1111);
> > =========================
> >
> > Thanks in advance,
> >
> > Selemon
> >
> >
> > _______________________________________________
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-- 
Catalin Ristea---------------------------------
High Energy and Heavy Ions Group
Niels Bohr Institute
Blegdamsvej 17, 2100 Copenhagen, Denmark
Tel (+45) 35 32 54 04 / Fax (+45) 35 32 50 16

E-mail: catalin.ristea_at_nbi.dk
http  : www.nbi.dk/~ristea
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