Global Tracking Momentum Scale

Contents

• Goal.
• Tasks.
• Tunable parameters in d0reco.
• Data Sets.
• Results.
• Talks.
• Documents.

• Identify and understand factors that affect the tracking momentum scale in a) reconstruction, b) Monte Carlo, and c) real life. The main factors are thought to be the magnetic field (normalization and shape) and detector material. Geometry is another potential factor, but is not currently a prime suspect in the observed resonance mass shifts.
• Identify or create tunable parameters in d0reco that affect the track momentum scale. Obviously, these tunable parameters should be related to the factors identified in the previous bullet.
• Create a standard set of track momentum scale certification plots. These will mainly be based on masses of resonances as a function of various kinematic quantitles.
• Identify and make available standard data sets for the various resonances that will be studied.
• Tune parameters.

// factors to multiply the default SMT material for better description of 
// multiple scattering
float MS_Factor_ladder = 2.5
float MS_Factor_Fdisk = 2.5 
float MS_Factor_Hdisk = 1.

Skimmed Minidsts

Skimming is still in progress. Data tier is dsts with dropped chunks so that event size of about one quarter of a normal dst. Track, cluster, muon, vertex, and raw data chunks are retained. Event selection is two tight muons with central track match required. About 25% of events are J/psi's.

Disk location	Data Tier	Files	Events	Description
/rooms/Islip/projects/greenlee/skim2mu_dst	reconstructed	-	-	2 tight muons with central track match

B Physics J/psi->mu mu Raw Skim

SAM Dataset	Data Tier	Files	Events
bphysics-dimuons-picked-set17	raw-bygroup	766	76,509
bphysics-dimuons-picked-raw-set16	raw-bygroup	212	20,666
bphysics-dimuons-picked-raw-set12	raw-bygroup	388	38,298
bphysics-dimuons-picked-set9	raw-bygroup	229	22,862
bphysics-dimuons-picked-raw-set4	raw-bygroup	332	33,129
bphysics-dimuons-picked-set3	raw-bygroup	234	23,327

Z->mu mu

• Sergey's talk at 23-Jan-2004 ADM meeting.
• Rick's talk at 18-Dec-2003 tracking meeting.
• Arnold's talk at 11-Dec-2003 tracking meeting.
• Andrei's talk at 4-Dec-2003 tracking meeting (magnetic field normalization).
• Herb's talk at 20-Nov-2003 tracking/vertexing meeting.
• Herb's talk at 6-Nov-2003 tracking/vertexing meeting.
• Supriya & Arnold's talk at 23-Oct-2003 tracking/vertexing meeting.