Measurement of Lambda(C) Branching Fractions of Cabibbo-Suppressed Decay Modes in the BABAR Experiment

Abstract

This dissertation reports on a study of the relative branching fraction measurement of the charmed baryon Λ c decaying to the Cabibbo-suppressed modes.A data sample of 125 fb −1 is used for these measurements. This data samples ii experiments and also to the theoretical predictions (wherever needed) are also given.iii To my father and (late)mother iv AcknowledgmentsAs with any major endeavour, this thesis was not created in vauum but rather in a fertile academic enviornment with the assistance of many people. I cannot hope to mention every person who has played a part but some individuals are worthy of specific mention. I am highly indebted to Dr. Prafulla K. Behera of University of Pennsylvania, who took upon himself "to show me the ropes". I learned a great deal from him and had a lot of fun working with him. Prafulla deserves a great appreciation and high respect for his patient instructions and kind guidance through out my stay at SLAC from starting of my analysis towards the completion of this thesis and the paper. I am very thankful to Prafulla for being there whenever I was looking for help.Whilst serving as Data Quality Manager for the BABAR collaboration I had the opportunity to work with wide range of collaboration members. I would like thank to my wonderful colleagues at IR2 during this times, in particular to the OEP group members who were always around to help and were great pleasure to work with.I also have to thank my paper committee, Georges Vesures, Gerry Lynch, Brain All known interactions between matter particles can be explained in terms of only four fundamental forces, which in order of increasing strength are the gravitational force, the weak force, the electromagnetic force, and the strong force. The gravitational force acts between particles with mass and is responsible for the binding of matter on a cosmic and planetary scale, but because of its small strength it has negligible effect on high energy physics phenomena.The weak force acts upon particles with weak charge (all leptons and quarks) and is responsible for some of the spontaneous decays of particles (e.g., the radioactive 2 nucleus β decay). Since the weak force is short lived so all the massive particles created at the birth of the universe have since decayed to less massive particles that compose the world we live in today.Particles with electric charge (all quarks and the three charged leptons) interact through the electromagnetic force, the force which binds the atoms and molecules together. The theory which describe this force is called QED.Finally, the color force (also known as strong force) acts between the particles with color charge (all quarks but not the leptons) and is responsible for the confinement of the quarks inside a hadron (and of course on a larger scale, for binding the hadrons in a nucleus). The color force is known to work under the QCD (Quantum Chromodynamics). Both the electromagnetic and strong force conserve quark and lepton flavor.When the two matter particles interact through a fundamental force,...