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Kaon identification and Search for Lepton Number Violation in K\(^±\) decay-in-flight experiments at CERN

Massri, Karim (2015)
Ph.D. thesis, University of Birmingham.

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Abstract

A search for the Lepton Number Violating decay \(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\) has been performed using the data collected by the NA48/2 experiment in 2003 and 2004. The signal event selection, the background rejection, the evaluation of the muon identification efficiency and the statistical methods used for the data interpretation are presented. Based on 1.8 x 10\(^1\)\(^1\) kaon decays in the fiducial volume and using several models for the signal, upper limits for the branching ratio \(B\)(\(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\)) of the order of 10\(^-\)\(^1\)\(^0\) have been obtained for 90%, 95% and 99% confidence levels, improving the previous best limit of one order of magnitude.

The Cherenkov differential counter used for kaon identification in the NA62 experiment, equipped with approximately 30% of the photo-detectors, was installed and tested during a Technical Run in 2012. The counter's ability of distinguishing between kaons and pions has been validated via pressure scan procedure. The data collected have been used for evaluating the kaon efficiency and time resolution. The extrapolation to the full-sized detector has been also estimated.

Type of Work:Ph.D. thesis.
Supervisor(s):Lazzeroni, Cristina and Goudzovski, Evgueni
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Subjects:QC Physics
Institution:University of Birmingham
ID Code:5451
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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