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- GPC comments/resubmission to PRL of AL paper - Bernd
- Preparation for run11 - Joe
- Luminosity Monitoring for run11 - Ross
- BTOW Scale update - Justin
- will BSMD help in anythingW reco? - Jan
October 12, 2010
Present:
Agenda:
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- TPC, Gene:
- non-linear SC(lumi) should provide TPC track accuracy of 2 mm at both ends of the track. We hope Joe will work on this next week, should take a week.
- We could also use Gene's PCA method of finding a linear combination of scalers (each at first order).
- since linear SC(lumi) was tuned to lumi equivalent to ZDC base rate of 70kHz, any pp500 run taken at the ZDC rate has current best TPC calibration. Jan: I'll use it for beam line constrain study, see below.
Wiki Markup *beam line constrain* : plan A is Rosi & Jan succeed with 3D beam line fit to global tracks w/o intermediate vertex finding. Here are \[[Media:Beamline-v3.pdf |details of the algo]\] as intended and not implemented. If this works Gene needs a \~day to produce beam line constrain for all 39 fills. Plane B is to use Minuit vertex finder which may require significant stats to overcome jitter due to pileup tracks. In such case we would need to provide manpower for \~week long job, Gene would only supervise it. Jan: lets go for plan A.
- conclusion: once both items are resolved we can ask for production, perhaps 2 weeks from now.
- BTOW, ETOW gains - no progress.
Wiki Markup BSMD : Willie is working '''slopes for individual strips'''. He run over 10k VPD-minB events and got this \[[Media:BSMD-strips-Picture 16.png|2D plot of module 119]\] and spectra \[[Media:BSMD-strips-Picture 15.png |individual strips]\]. The available 1.5M vpd-minB events should be enough to fit every strip. If not we will merge strips.
Wiki Markup BSMD geometry: Scott asked how well we know '''relative position of BSMD vs. TPC'''. It is [followed up on emc2-hn |http://www.star.bnl.gov/HyperNews-star/get/emc2/3250/1.html]. <p> Scott once did \[[Media:Conversions-distace-Scott.pdf | simple calculation for photons that convert to e+/e- pairs|||||||||||||||||||||||||||\||]\] in the SVT, attached. <br>The relevant equation is on the bottom left. For the W -> e, we have r_1 = 0, r_2 = 2.3 m (approximate radius of BSMD planes), and B = 0.5 T. With these numbers, you get the simple relation<br> dPhi (cm) = 40 / pT (GeV)<br>For example, an electron of 40 GeV pT will deflect in the phi direction by 1 cm relative to the same e- of infinite pT. This is probably good to better than a few %.- run QA : Scott is working on his fills.
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