Beamline

Takashi Kobayashi

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Global Analysis MeetingNov. 29, 2007

Beamline group will be responsible to• Beamline construction/commissioning• Beamline operation to assure stable beam and data taking• Detector calibration

– P(CT, SSEM, ESM)/MU/(INGRID)• Monitor/control beam stability

– Intensity, center position, profile• Provide minimum beam information for SK online reduction

– Timing, POT,..• Provide all beam related information necessary to physics analysis

– good beam run and good beam spill– Normalization (POT, Nmu)– Prediction of beam properties w/ syst. error

• (E) and e(E) at ND and SK• beam profile at ND• Far to near extrapolation (F/N ratio or Matrix or ?)

– Depend on overall analysis strategy– Need discussion in this group– Beam group would like to make proposal

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Toward these• Beam stability

– p/MU monitor (and INGRID)• Good beam run & spill

– Establish selection criteria– provide database and API to access it– Based on

• Beam status• Proton intensity, position, profile• Target, horn status• MUMON intensity, center position, profile• Good GPS data

• beam prediction– Develop and maintain beam MC

• G3-based jnubeam on CVS– People who can modify the code will (should) be restricted to “experts”

• Implement final precise beam line geometry, materials, p beam properties• Incorporate NA61 hadron production data, best algorism to be established• (Later replaced to G4-based program if necessary. Several years later?)

– Provide “official” prediction for physics analysis• Beam group will be responsible to produce beam properties from simulation• For various studies, users can freely run the program by themselves

– Even for this case, we will provide standard “official” CARD file information as default 3

NA61 analysis

• RUN ended on October 28th– all NA61 detector components worked well– new ToF detector ready in time this run– slow DAQ -> upgrade for 2008– physics data collected:

• ~ 600 k events 2 cm C target• ~ 200 k events 90 cm C target

– most of the 2007 goals achieved

• Analysis already started during the run– absolute p + C -> (K) + X cross section (thin target)– (K) / incident proton (thick target)– expect first results (preliminary) in spring 2008– too soon to assess the quality of the data and precisions

Sandro Bravar

4

Analysis status

• NA61 software inherited from NA49– basically working– old tools, rather large effort was required to update and port to SLC4;– some issues still to be solved

• organization of the software / analysis– working groups being formed– definition of tasks and manpower– analysis strategy

• software technical issues are being addressed and solved• alignment and calibrations (TPC and TOF) ongoing

– expect several months to complete all tasks (end of February 2008)

• data production (DST, miniDST, …) tests ongoing• monte carlo studies and production chain under development• normalization (trigger) studies started

Sandro Bravar

5

Analysis plan

• complete all calibrations by end of February(maybe a bit optimistic)

• reconstruction of data (DST and miniDST production) by end of January using existing tools(PID calibrations will be added later)re-production possible after optimization of reconstruction algorithms (cannot wait forever)

• production of monte carlo events for tracking studies and optimization about to start

• development of analysis tools using reconstruction test data just or about to start

• « analysis » to start after calibrations and reconstruction completed

• develop different alogrithms for thin and thick target(e.g. vertex reconstruction)

Sandro Bravar

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