====================== p=(20,30) pt=(1.1,1.3) ====================== tracks passing through vt2 only (right side e.g. neg 37 wrong side e.g. neg 4) mt only (wrong side e.g. pos 1) vt1+vt2 (right side e.g. neg 31) vt2+mt (right side e.g. pos 0 wrong side e.g. pos 3) vt1+vt2+mt (right side e.g. pos 2) COMMENTS: 1) rather many (5) splits seen, mostly wrong side mt-only tracks 1 kink candidate (see "strange stuff") 2) mt part of track often lost 3) happens often (wrong side) that 1st fitted point has nothing to do with track (is off) 4) many tracks could be atributed to unrecognised decay products? 5) error(b) sometimes enormous (100cm) -> mom.resolution ??? two categories are present in detailed description below: BAD- considered bad DOUBTS- causing any doubts (much less important) NOTE: it should not be surprising that enumerating does not include certain letters as some problems found are not present ofr this sample. -------------------------- overall statistics for bad -------------------------- problem positives negatives right side wrong side right side wrong side A) joined tr 0 0 0 0 B) large a/p 0 0 0 0 C) split cl.? 0 0 0 0 D) splits-serious 0 1 1 3 splits-candidates 0 0 0 0 E) lost parts 5 1 4 0 F) lost points 0 1 0 1 G) strange stuff 0 15 0 8 ========= detailed positives ========= BAD --- D) SPLITS/CANDIDATES FOR SPLITS 37: wrong side, 1st fitted point completely off, split? E) LOST PARTS 3: wrong side, mt part lost 30,38,39,63,69: right side, mt part lost F) LOST POINTS 19: wrong side, 4 points lost in mt even if distance below 15 mm. G) STRANGE STUFF 46: wrong side, 1st fitted point completely off. KINK. 17,28,53,73,79: wrong side, 1st fitted point completely off. 22,25,33: wrong side, 1st fitted point completely off, could be a decay product, will not be recognised (mt-only) SEE ALSO 37 IN D) 60,61,83,94: wrong side, 1st fitted has nothing to do with track (track point is there) 97: wrong side, 1st fitted has nothing to do with track (track point is there), could be a decay product, will not be recognised (mt-only) DOUBTS ------ A) A/P OR LARGE DISTANCE FOR POINTS 8: right side, is it correct to take blue point? could be part of noise... 11: right side, points in mt found an a/p=-1% 27: right side, a/p (vt1)=171%, 12 points... 55: wrong side, a/p (vt2)=131%, will be rejected, ok C) STRANGE STUFF 4: wrong side, interaction in gas or decay? probably resolved correctly... 15: wrong side, decay product? b=0, will not be rejected 21,70: wrong side, could it be a decay product? 66: right side, could it be a decay product? 87: right side, mixing points from 2 tracks??? ========= detailed negatives ========= BAD --- D) SPLITS/CANDIDATES FOR SPLITS 60: . right side??? probably non-vertex track, split. vertex constraint makes crazy fit. should be rejected by b cut. 73: . wrong side, mt only, double split. 1st fitted point has nothing to do with track (track point is there), it should probably by kept (?), still has low a/p. to be discussed. 76: . wrong side, mt only, probably non-vertex, split. 1st fitted point has nothing to do with track (track point is there), it should probably by rejected, but a/p is high so it will be difficult. 82: . wrong side, mt only, double split? a/p still 92%... E) LOST PARTS 14,15,53,56: right side, mt part lost F) LOST POINTS 41: wrong side, 3 points lost in mt even if distance below 1.5 cm, why a/p=-1% ? G) STRANGE STUFF 11,18,38,44,77,91,92: wrong side, 1st fitted point has nothing to do with track (track point is there) 40: wrong side, 1st fitted point has nothing to do with track (track point is there), could be a decay product, will not be recognised (mt-only) DOUBTS ------ A) A/P OR LARGE DISTANCE FOR POINTS 25: wrong side, points in mt found and a/p=-1%... 69: right side, points in mt found and a/p=-1%, fitted line rather off both in x,y, danger of point mismatch... 72: wrong side, difficult to say whether points out of sector boundary, but corresponding to track in sector boundary are chosen correctly. C) STRANGE STUFF 6: mt-only, track visibly does not point to vertex. is it a sense to fit it there? (just a question) 52:wrong side, very large b - could these be distorsions due to edge in vt2? 78: wrong side, in principle should leave a few points in vt2, it did not, but is it reasonable to reject on the basis of a/p=0%? 89: right side, magic? 93: right side, large bx, should be rejected Positives 12 ++------------+----------**--+-------------+--------------+------------++ 10 ++ + ** + + + ++ 8 ++ **** ++ 6 ++ ** ** **** * * *** ++ 4 ++ ******** * *** * ******* *** ** ***** * ++ 2 ++** ** ***** ***** ** ** ****** ***** ***** ***+ ++ 0 ***-----------+--------------**--------**--*****---------************--++ 0 50 100 150 200 250 Number of points Negatives 16 ++------------+----------$$--+-------------+--------------+------------++ 12 ++ + $$ + + + ++ 10 ++ $$ ++ 8 ++ $$ ++ 4 ++ $$$ $$$$ $$$ $$$$ $$$$$ ++ 2 ++ $ $$$$ $$$$$$ $$$$$ $ $$$$$$$ $$ $$$ $$ $$ $ + ++ 0 $$$$$---------+-----------$$$$--$$-$$$$$$$$$-$$$$$$$----$$$$$$$$$$$$$--++ 0 50 100 150 200 250 Number of points