Minutes of Meeting 11/2/08

Bristol: Clare, Ryan, Helen, Mark, Joel

Edinburgh: Hajrah, Robervaal, Victoria

Mark showed some plots that will form part of his talk in the general physics meeting tomorrow (see previous post). They show the y-cut that is required to ensure that all of the electron EM clusters are grouped together into a single jet. This is shown both for "undecayed" (i.e. no brehmsstrahlung within the tracking volume) and for all electrons. The y-cut value decreases with energy as expected, and is orders of magnitude smaller than values expected for hadron jets.

The final plot shows the distribution of electron track p_T (green), total jet energy (orange) and single cluster energy (pink). 

Hajrah has made an impressive start with Mokka/Marlin on muon ID. She is looking at the energy deposits and number of hits as muons traverse the calorimeters and will proceed to investigate the muon chambers.

The next meeting will be in two weeks, and they will remain fortnightly until further notice.

Minutes of meeting on 28th January

Sorry these are late!

In attendance: Victoria, Roberval, Hajrah, Joel, Clare, Ryan and Mark.

Mark is updating the framework for his analysis to make tagging variables and likelihood cuts (to separate data and background) a la Kuhl-Desch analysis. The likelihood cuts are based on thrust, visible energy and tagging probability.

Clare has generated at ZZ-->l+ l- q qbar events with Pthyia to make stdhep files. She's also been working on the Pandora calibration the LDC_01-05 geometry.

Together Clare and Mark have been generating electron and jet samples for the UG student. UG student has been AWOL, so Helen will help out here.

Clare and Mark agreed that they would read all the LDC emails that are being circulated to check that we are conforming to the official analysis for the LCF CDR.

Roberval has been making a comparison of the results obtained with SimpleCaloDigi and MokkaCaloDigi. MokkaCaloDigi is better, Clare and Roberval witll communicate on this.

Plan for upcoming work:

• 
  Hajrah is starting to learn about Marlin and Mokka, and will start generating single muon events this week.


• 
  Mark will re-generate the signal at ECM=250 GeV

Minutes of Meeting 15/1/08

Our first regular meeting was held at 4pm on Monday. The main points were:

• Mark's Plots (see previous entry): number of jets and mass of the Z as as function of K_T cut. Things look sensible in the limits, but he has discovered a bug that can double count if more than one MC particle is in the same jet (this gives the peaks at m_Z=180 GeV etc.)
• Energy: it was agreed to make future samples with c.of.m energy 250 GeV as specified in the benchmarks
• Effort: Mark is working full time, with support from Clare. Victoria and Robervaal are working on other things at the moment but should start ramping up soon. Hajrah is coming up to speed, and will start looking at muon ID. There is also an undergraduate at Bristol who will look at electron ID, and an undergraduate at Edinburgh who will be asked to make a short presentation soon.
• Next Steps: Mark's priority will be to assemble all of the machinery for a crude analysis, so we can see where the work needs to be done in tuning etc.
• Future Meetings: We will switch to 1pm on Mondays in future. Next meeting is next week.