QCD Meeting October 1, 2004 Is it due to the hard collision? Is it due to fragmentation? Strong polarization seen in fixed-target experiments where jet.

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Presentation transcript:

QCD Meeting October 1, 2004 Is it due to the hard collision? Is it due to fragmentation? Strong polarization seen in fixed-target experiments where jet NOT observed.  Polarization Tom Devlin Rutgers/CDF _

Status and Plans Three known contributions to dataset: --  Signal -- K s Background -- Continuum 2-track background MC code exists to generate first two. Coding in progress for the third. Plan: Generate 20 MC of each type for each real event. Mix three MC samples, in appropriate proportions to produce 20 MC events for each real event. Adjust proportions of each and assumed polarization of MC  ’s to fit data.

Old Distribution Shown Last Time Fit with no Mass Constraint: Assume Daughters are p  Subtract  signal, Smooth Remainder (5-bins)

Fits Without and With Mass Constraints Shown Last Time Two Major Improvements In This

Eliminate Decay Vertices Within 8 cm of Primary Interaction

Eliminate  e + e - Cut Events with M 2 (ee)<0.01

Signal-Noise Improved By Large Factor

Huge Improvement in Signal/Noise Extended Momentum Range from 2-12 GeV/c to 2-20 GeV/c Study , K s,  Background vs. Momentum and Flight Distance L xy

For one bin in p and L xy : (loose-cut  ) – (tight-cut  ), (tight-cut K s ), plot both vs. M 2 (p  ) Sum of two plots = K s + background Subtract from loose-cut   Number of pure 

Do this for all bins, and for K s to get Relative Number of , K s and Background

For Each Bin in Momentum and L xy Evaluate Fractions of , Ks and 

Restrictions on Angular Distribution

Work in Progress and Planned: Fall, Mass-constrained fits: 2- , 2-K s, 1-ee. 2. Sum of weights over solutions = 1.0 per event. 3. Use  2 =  2 (MassConstraint) -  2 (NoMassConstraint) 4. Determine relative proportions of , K s and background 5.Modify 2 nd stage analysis code to mix MC samples from , Ks,  in correct proportions. Possibly as fit parameters with constraints. 6.See if a believable polarization analysis can be done in one of the three coordinate systems. 7.If so, do polarization in the other two coordinate systems.