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Tracker Analysis update

Tracker Analysis update. Horikoshi, H. Sakamoto and M. Yoshida 2006/2/09 Tracker phone meeting. Magnetic field non-uniformity around the tracker. Tracker was placed in the solenoid magnet bore with the center shifted upstream Magnetic field is not uniform through station 1 to station 4

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Tracker Analysis update

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  1. Tracker Analysis update Horikoshi, H. Sakamoto and M. Yoshida 2006/2/09 Tracker phone meeting

  2. Magnetic field non-uniformity around the tracker • Tracker was placed in the solenoid magnet bore with the center shifted upstream • Magnetic field is not uniform through station 1 to station 4 • 20% drop at station 4

  3. Magnetic field correction • Assuming 1-Tesla uniform field, fitted pz has bias. • Effective magnetic field on the tracker is Bdl = 0.96 Tesla. • Bdl : averaged magnetic field along the path of muons MC input Fit assuming uniform B Corrected with Bdl longitudinal momentum

  4. Measured momentum • MC is tuned by using profile and Time-of-Flight at TOF hodoscope • Momentum distribution measured in the tracker is well agreed with MC simulation. Beam momentum at TOF hodoscope

  5. Transverse momentum • Transverse momentum distribution become broader due to the non-uniformity of magnetic field • The distribution on station 1, 2 and 3 are same.

  6. Tracker acceptance • Acceptance on tracker is studied by selecting incident position on TOF hodoscope • The region of TOF3xTOF8 is acceptable by tracker for all momentum range

  7. Resolution on Pt measurement

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