_ Two of the most urgent problems from last weeks (ed, mc recon)
have been promptly solved. Found bug affecting reconstruction
_ t2d/recon problems
_ found that t2d was invoked with track angle in radians
when deg was expected
_ When this is accounted for dp, dth, dph, dz worsen by ~ 50%
_ Not understood. Could be recon problem, could be t2d
_ Problem only with data, montecarlo recon fine now
_ it looks bad also with older 3rd order parametrization
_ need to make sure we use same definition of track angle !
_ Montecarlo uses d2t (inverted from garfield t2d), generates TDC
and then uses garfield t2d in recon, so effectively a "bad" t2d
will cancel in montecarlo
_ Is the recon speed mc/data different ?
_ Also, selecting only linear region yields same momentum uncertainty (5%)
_ Could there be more bugs ... ? discussion on retiming
_ ed
_ ed yields miisng becuase of bad chi2 cut
_ remaining L,R differences 10% sitll investigating
_ ed vector asymmetry : no report, PK busy
_ eep Pz vs Pzz
_ QE Analysis determines Pz, Pzz not P1, P2
_ Pzz determined in 3 independent ways. lower than Pz
_ Unlikey QE Pz is right, Pzz is wrong
_ Still Pzz 0.5 and Pz 0.75 why ?
_ Would require simultaneous inefficiency of MFT14 and SFT35
of the order of 20 % assuming only T=-2 state wrong
_ Note these transitions unique to T=-2 state
_ Problem with DGen input ? responses ?
_ Note DGEN input if response f's, no P1, P2 ambiguity there
_ Maybe beam pol too low
_ Note value would need to be 97.5 !! (from 65 %)
_ of course could account for part of discrepancy
_ Will compare to eep data in NIKHEF acceptance
_ Singles
_ NM shows D2 spectrum and asymmetry (only in Delta region)
_ currently comparing H2 singles with montecarlo
_ montecarlo
_ Nice tip from CC: switch off random wch hits to speed up
recon (note this feature is not used right now)
_ oba
_ TA has a script for DVD backups. Will send instructions
_ recrunch
_ TDC offsets (tof, neutron) not ready, t2d bug not fixed
_ code being tested
_ will focus only on subset of data initially
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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