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Momentum Analysis of Cosmogenic Muons in the MINOS Detectors



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Momentum Analysis of Cosmogenic Muons in the MINOS Detectors A thesis submitted in partial fulfillment of the requirement for the degree of Bachelor of Science with Honors in Physics from the College of William and Mary in Virginia by Daniel Damiani Accepted for Honors Advisor Prof Jeffery Nelson Prof John Delos Prof Jan Chaloupka Prof Nahum Zobin Williamsburg Virginia May 2006 Abstract Proper reconstruction of muon tracks requires that the magnetic fields in the two MINOS detectors be well understood Previous work revealed problems with the measured ratio of reconstructed cosmic ray to in certain regions of the detector indicating that the current model of the field for those sections was unsatisfactory Modeling of the effects of the ends of both detectors and the supermodule gap of the far detector had been left out of the model of the magnetic field because the old finite analysis based method was too memory intensive and slow to use in track reconstruction A new implementation of the end and supermodule gap effects was created using a piecewise linear fit to the old end effect model to better model the field in the problem regions The magnetic properties of the detector steel were also characterized to correct additional problems with the detector magnetic field Cosmic ray muon data for the near detector was also analyzed The charge sign ratio of the muons analyzed was 1 27 0 074 which was in line with previous results i Acknowledgments I would first like to thank my advisor Professor Jeff Nelson for making this research possible through his guidance support and always helpful feedback I would also like to thank Dr Francisco Yumiceva for his invaluable assistance with my code development and ever present willingness to help Lastly I wish to thank the Honors Committee for the time they have spent evaluating my research ii Contents Abstract iv 1 Introduction 1 2 Cosmic Ray Muons 3 2 1 Basic Properties 3 2 2 Energy Loss in Matter 3 2 3 Charge Sign Ratio 4 3



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