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7.2 Exclusion limit from this analysis. The thick solid line corresponds to the lower bound of points excluded at 90% confidence. The yellow band corresponds to the region which contains the sensitvity for 50% of an ensemble of simulated experiments with our expected backgrounds listed in Table 6.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 7.3 Plot of σ SI per nucleon versus WIMP mass. Exclusion curves for EDELWEISS (black dashed) [40], CDMS I - SUF (blue dashed) [41, 43], CDMS II - SUF (blue solid) [42, 37], ZEPLIN (magenta solid), CRESST (magenta dashed), and CDMS II - Soudan (black solid). The red region is the DAMA detection claim [39]. Limitplot courtesy of [44].110 7.4 Limit plot showing allowed regions corresponding to allowed models from Fig. 1.8[32] (cyan), recent mSUGRA framework calculations using Markov chain monte carlos (dark blue) [67], and split supersymmetry (yellow dots). The black curve is the current Soudan Run 118 limit. The dashed curve is the expected final CDMS II Soudan sensitivity. The red region is the DAMA detection claim [39]. Limitplot courtesy of [44] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 xxiv
Chapter 1 Introduction 1.1 Hints of Physics Beyond the Standard Model The Standard Model of particle physics is one of the triumphs of 20th century physics. It is a gauge theory based on the SU(3) C ×SU(2) L ×U(1) Y gauge group where interactions between three generations of quarks and leptons are mediated by gauge bosons. Particles come to have mass via the Higgs mechanism since explicit mass terms in the Lagrangian would violate gauge invariance. The Higgs mechanism introduces a single scalar SU(2) doublet which sits in a “Mexican hat” potential V (φ) = −µ 2 φ 2 + λφ 4 (1.1) and has Yukawa couplings to fermions. Eqn. (1.1) gives the Higgs field a non-zero vacuum expectation which “breaks” gauge invariance. It is the non-zero vacuum expectation of the Higgs field that then gives mass to all other particles. There are many suggestions that the Standard Model is incomplete. In this section, I will present two problems that point towards physics beyond the Standard Model and discuss an attractive extension that addresses both of these issues. 1.1.1 The Gauge Hierarchy Problem The first problem is the Gauge Hierarchy problem and is theoretical in nature. 1
Page 1 and 2: THE CRYOGENIC DARK MATTER SEARCH (C
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cdms-ii - CDMS Experiment - University of California, Berkeley

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