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Report of the SUGRA Working Group for Run II of the Tevatron

V. Barger, C. E. M. Wagner

Abstract

We present an analysis of the discovery reach for supersymmetric particles at the upgraded Tevatron collider, assuming that SUSY breaking results in universal soft breaking parameters at the grand unification scale, and that the lightest supersymmetric particle is stable and neutral. We first present a review of the literature, including the issues of unification, renormalization group evolution of the supersymmetry breaking parameters and the effect of radiative corrections on the effective low energy couplings and masses of the theory. We consider the experimental bounds coming from direct searches and those arising indirectly from precision data, cosmology and the requirement of vacuum stability. The issues of flavor and CP-violation are also addressed. The main subject of this study is to update sparticle production cross sections, make improved estimates of backgrounds, delineate the discovery reach in the supergravity framework, and examine how this might vary when assumptions about universality of soft breaking parameters are relaxed. With 30 fb$^{-1}$ luminosity and one detector, charginos and neutralinos, as well as third generation squarks, can be seen if their masses are not larger than 200-250 GeV, while first and second generation squarks and gluinos can be discovered if their masses do not significantly exceed 400 GeV. We conclude that there are important and exciting physics opportunities at the Tevatron collider, which will be significantly enhanced by continued Tevatron operation beyond the first phase of Run II.

Report of the SUGRA Working Group for Run II of the Tevatron

Abstract

We present an analysis of the discovery reach for supersymmetric particles at the upgraded Tevatron collider, assuming that SUSY breaking results in universal soft breaking parameters at the grand unification scale, and that the lightest supersymmetric particle is stable and neutral. We first present a review of the literature, including the issues of unification, renormalization group evolution of the supersymmetry breaking parameters and the effect of radiative corrections on the effective low energy couplings and masses of the theory. We consider the experimental bounds coming from direct searches and those arising indirectly from precision data, cosmology and the requirement of vacuum stability. The issues of flavor and CP-violation are also addressed. The main subject of this study is to update sparticle production cross sections, make improved estimates of backgrounds, delineate the discovery reach in the supergravity framework, and examine how this might vary when assumptions about universality of soft breaking parameters are relaxed. With 30 fb luminosity and one detector, charginos and neutralinos, as well as third generation squarks, can be seen if their masses are not larger than 200-250 GeV, while first and second generation squarks and gluinos can be discovered if their masses do not significantly exceed 400 GeV. We conclude that there are important and exciting physics opportunities at the Tevatron collider, which will be significantly enhanced by continued Tevatron operation beyond the first phase of Run II.

Paper Structure

This paper contains 1 section, 2 figures.

Table of Contents

  1. Trilepton Analysis with Variable Cuts

Figures (2)

  • Figure 1: Tevatron reach in the trilepton channel in the $M_0-M_{1/2}$ plane, for fixed values of $A_0=0$, $\mu>0$ and (a) $\tan\beta=5$, or (b) $\tan\beta=35$. Results are shown for 2, 10 and 30 ${\rm fb}^{-1}$ total integrated luminosity.
  • Figure 2: The optimal sets of trilepton cuts in the $M_0,~ M_{1/2}$ plane, for $\tan\beta=5$ and small $M_0$. We show the optimal low end dilepton mass cut $m^\gamma_{\ell^+\ell^-}$, missing $E_T$ cut $\hbox{,/}E_T$, high end dilepton mass cut $m_{\ell^+\ell^-}$, transverse $\ell\nu$ mass cut and lepton $p_T$ cut (see text). The dotted lines indicate the reach contours from Fig. \ref{['3l']}.