Beamline

1. Global Analysis Meeting Nov. 29, 2007 Beamline Takashi Kobayashi

2. 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 n beam properties w/ syst. error • Fnm(En) and Fne(En) at ND and SK • n 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

3. 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 • n 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

4. NA61 analysis Sandro Bravar • 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 -> p (K) + X cross section (thin target) • p (K) / incident proton (thick target) • expect first results (preliminary) in spring 2008 • too soon to assess the quality of the data and precisions

5. Analysis status Sandro Bravar • 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

6. Analysis plan Sandro Bravar • 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)