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Combinatorial and Off-Shell Effects in New Physics Cascades

Authors: Wiesler, D.;

Combinatorial and Off-Shell Effects in New Physics Cascades

Keywords

Dissertation

86 references, page 1 of 9

1 Introduction 1 1.1 Physics in an LHC Environment . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Discrete Parities and Dark Matter . . . . . . . . . . . . . . . . . . . . . . 6 1.3 Motivation and Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Methods of Mass and Spin Determination at Hadron Colliders 11 2.1 Mass Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.1.1 Exclusive Cascades . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.1.2 Inclusive Approaches . . . . . . . . . . . . . . . . . . . . . . . . 20 2.1.3 Edge-to-Bump Method . . . . . . . . . . . . . . . . . . . . . . . . 24 2.2 Spin Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2.2.1 Angular Correlations in Cascades . . . . . . . . . . . . . . . . . 28 2.2.2 Inclusive Angular Distributions . . . . . . . . . . . . . . . . . . 33

3 Off-shell Effects in Decay Cascades 39 3.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.2 Simulation Setup and Benchmark Model . . . . . . . . . . . . . . . . . 41 3.3 Off-shell Effects in Mass Measurements . . . . . . . . . . . . . . . . . . 45 3.3.1 Exclusive Cascades . . . . . . . . . . . . . . . . . . . . . . . . . . 46 3.3.2 Inclusive Approaches . . . . . . . . . . . . . . . . . . . . . . . . 56 3.4 Off-shell Effects in Spin Determinations . . . . . . . . . . . . . . . . . . 59 3.4.1 Shape Asymmetries . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.4.2 Hadronic Angular Correlations . . . . . . . . . . . . . . . . . . . 64 3.4.3 Inclusive Angular Distributions . . . . . . . . . . . . . . . . . . 66

4 Combinatorial Effects in Gluino Dijet Endpoint Measurements 69 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 4.2 Benchmark Scenarios and Simulation Setup . . . . . . . . . . . . . . . . 72 4.3 Derivation of Selection Criteria . . . . . . . . . . . . . . . . . . . . . . . 74 4.4 Kinematic Variables with reduced Combinatorial Impact . . . . . . . . 79 4.5 Discriminating distinct Gluino Endpoints . . . . . . . . . . . . . . . . . 82 4.5.1 Scenario A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 4.5.2 Scenario B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 4.5.3 Scenario C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 4.6 Endpoint Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

5 Fake Combinatorics from Particles with non-standard quantum numbers 91 5.1 Characteristics and Signatures of exotic chiral Fermions . . . . . . . . . 92 5.2 Mass Edges with chiral Exotics . . . . . . . . . . . . . . . . . . . . . . . 94 5.3 True and Fake combinatorics in Cascades . . . . . . . . . . . . . . . . . 98 1in000 Invariant Mass Distribution of (l,l) B

ten800

[1] S. Glashow, “Partial Symmetries of Weak Interactions,” Nucl.Phys., vol. 22, pp. 579-588, 1961.

[2] S. Weinberg, “A Model of Leptons,” Phys.Rev.Lett., vol. 19, pp. 1264-1266, 1967.

[3] A. Salam, “Weak and Electromagnetic Interactions,” Conf.Proc., vol. C680519, pp. 367-377, 1968.

[4] G. Arnison et al., “Experimental Observation of Isolated Large Transverse Energy Electrons with Associated Missing Energy at s**(1/2) = 540-GeV,” Phys.Lett., vol. B122, pp. 103-116, 1983.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average