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First look at s rest

First look at s rest. Peter Križan Friday meeting, Jan 27 2006. Impact of s rest. With a aerogel thickness of 4cm: s track from 4.1mrad -> 4.8mrad s rest = 0 s rest = 8mrad s track from 4.7mrad -> 4.1mrad 2 layers 3 layers -> Have to understand the origin of s rest !.

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First look at s rest

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  1. First look at srest Peter Križan Friday meeting, Jan 27 2006

  2. Impact ofsrest With a aerogel thickness of 4cm: strack from 4.1mrad -> 4.8mrad srest=0srest=8mrad strack from 4.7mrad -> 4.1mrad 2 layers 3 layers -> Have to understand the origin of srest!

  3. srest vs. distance: MD6+MD9 Full sigma, AB, BA srest , AB, BA srest=7mrad srest=0mrad

  4. srest vs. distance: KMD4-13 Full sigma, AB, BA srest , AB, BA srest=7mrad srest=0mrad

  5. Contribution of the tracking error tosrest Simple model: error in coordinates at z0 and z4 (MWPCs), multiple scattering only in the detector material. Motivation: walls of the box (at z1 and z3) are too close to the MWPC and to the aerogel to have a significant effect.

  6. Tracking error

  7. Tracking error: use BT04 data to tune the material at z2 Best with rather high material - 0.7 X0 - probably a consequence of material or the imperfection of the model.

  8. Tracking error

  9. Tracking error: impact of material at z2

  10. Issrest composed of a constant + tracking error?

  11. Issrest composed of a constant + tracking error?

  12. Status Data analysis relies mostly on what I did during the beam test, so a further tuning of geometric constats might yield slightly smaller values of sigma -> to be done in the next days

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