Saif, Harith N (1992) Charginoneutralino production in pp̄collisions for the leftright supersymmetric model. PhD thesis, Concordia University.

Text (application/pdf)
4MBNN84666.pdf 
Abstract
An extension of the supersymmetric standard model to the supersymmetric SU(2)$\sb{\rm L}$ x SU(2)$\sb{\rm R}$ x U(1)$\sb{\rm BL}$ model is considered. The gauge group contains bidoublet and triplet Higgs fields. In this work we have considered chargino (charged gauginos mixed with higgsinos) and neutralino (neutral gauginos mixed with higgsinos) eigenstates for the leftright supersymmetric (LR SUSY) model. After mixing, in the minimal supersymmetric model (MSSM), there are two charginos and four neutralinos. In the LR supersymmetric model, in addition to four charginos there are three neutralinos generated from the first symmetry breaking, and four neutralinos generates from the second symmetry breaking. The mixings are in general model dependent. In the minimal SUSY and LR SUSY models, these mixings can be parameterized in terms of a few parameters. We find analytical expressions and numerical solutions for the mass eigenstates with some restrictions on the LR parameters. We also investigate the possibility of detecting chargino and neutralino production in ppcollisions at CDF, namely $\rm p\bar{p}\to W\sbsp{L,R}{} + X\to\ \sbsp{\chi\sb{j}}{\sim\sb}\sbsp{\chi\sb{i}}{\sim0} + X.$ The expressions for these inclusive crosssections are solved numerically, using parton model distributions. We have used $\rm \tilde{M}\sb\chi = 45\ GeV,$ tan$\beta$ = 1 and a lower bound on the lightest supersymmetric particle (LSP) mass, $\tilde\chi$ = 14 GeV. Finally we take $\rm M\sb{WR}\ge 300$ GeV for $\rm g\simeq g\sb{L}\simeq g\sb{R}.$ In the ppcenter of mass frame we find the cross sections are: $\rm \sigma\sb{L}(p\bar{p}\to W\sbsp{L}{} + X\to\sbsp{\chi\sb{j}}{\sim\sb}\sbsp{\chi\sb{i}}{\sim0} + X)\approx0.11$ nb, and $\rm \sigma\sb{R}(p\bar{p}\to W\sbsp{R}{} + X\to\sbsp{\chi\sb{j}}{\sim\sb}\sbsp{\chi\sb{i}}{\sim0} + X)\approx4.6$ pb, and thus $\rm \sigma\sb{L}\ge24\sigma\sb{R}$ at $\sqrt{\rm s}$ = 1.8 TeV. Cross sections are also given for larger values of the center of mass energy $\sqrt{\rm s}$ up to those available at the SSC. The results are compared with the promptlepton background of the $\rm W\sbsp{L,R}{}$ decays from $\rm p\bar{p}\to W\sbsp{L,R}{} + X\to\ell\sp\nu\sb{\ell L,R} + X.$ Both decays for $\rm W\sbsp{L,R}{}$bosons show Jacobian peaks for $\rm p\sb{T} = \sqrt{\{s}}/2\simeq M\sb{WL}/2\simeq40$ GeV $\rm (p\sb{T}\simeq 150$ GeV for M$\sb{\rm WR})$ at $\theta=90\sp\circ.$ Furthermore the chargino signature unlike the promptlepton background is symmetric under the Jacobian peak. We also exhibit the dependence of the angular distribution of the chargino on the c.m angle $\theta$ for $\rm p\sb{T} = 40$ GeV, 150 GeV at $\sqrt{\rm s} = 1.8$ TeV.
Divisions:  Concordia University > Faculty of Arts and Science > Physics 

Item Type:  Thesis (PhD) 
Authors:  Saif, Harith N 
Pagination:  xiv, 179 leaves : ill. ; 29 cm. 
Institution:  Concordia University 
Degree Name:  Ph. D. 
Program:  Physics 
Date:  1992 
Thesis Supervisor(s):  Kalman, C 
Identification Number:  QC 174.17 S9S24 1992 
ID Code:  6093 
Deposited By:  Concordia University Library 
Deposited On:  03 Sep 2009 13:48 
Last Modified:  13 Jul 2020 20:01 
Related URLs: 
Repository Staff Only: item control page