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Title: Supersymmetry, Naturalness, and Signatures at the LHC

Abstract

Weak scale supersymmetry is often said to be fine-tuned, especially if the matter content is minimal. This is not true if there is a large A term for the top squarks. We present a systematic study on fine-tuning in minimal supersymmetric theories and identify low energy spectra that do not lead to severe fine-tuning. Characteristic features of these spectra are: a large A term for the top squarks, small top squark masses, moderately large tan {beta}, and a small {mu} parameter. There are classes of theories leading to these features, which are discussed. In one class, which allows a complete elimination of fine-tuning, the Higgsinos are the lightest among all the superpartners of the standard model particles, leading to three nearly degenerate neutralino/chargino states. This gives interesting signals at the LHC--the dilepton invariant mass distribution has a very small endpoint and shows a particular shape determined by the Higgsino nature of the two lightest neutralinos. We demonstrate that these signals are indeed useful in realistic analyses by performing Monte Carlo simulations, including detector simulations and background estimations. We also present a method that allows the determination of all the relevant superparticle masses without using input from particular models, despite themore » limited kinematical information due to short cascades. This allows us to test various possible models, which is demonstrated in the case of a model with mixed moduli-anomaly mediation. We also give a simple derivation of special renormalization group properties associated with moduli mediated supersymmetry breaking, which are relevant in a model without fine-tuning.« less

Authors:
;
Publication Date:
Research Org.:
COLLABORATION - StanfordU.
Sponsoring Org.:
USDOE Director. Office of Science. High EnergyPhysics
OSTI Identifier:
929017
Report Number(s):
LBNL-59605
R&D Project: PTHOPS; BnR: KA1401020; TRN: US0803312
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical REview D; Journal Volume: 73; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
72; ENERGY SPECTRA; MASS DISTRIBUTION; RENORMALIZATION; SHAPE; SPECTRA; STANDARD MODEL; SUPERSYMMETRY

Citation Formats

Kitano, Ryuichiro, and Nomura, Yasunori. Supersymmetry, Naturalness, and Signatures at the LHC. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.095004.
Kitano, Ryuichiro, & Nomura, Yasunori. Supersymmetry, Naturalness, and Signatures at the LHC. United States. doi:10.1103/PhysRevD.73.095004.
Kitano, Ryuichiro, and Nomura, Yasunori. Fri . "Supersymmetry, Naturalness, and Signatures at the LHC". United States. doi:10.1103/PhysRevD.73.095004. https://www.osti.gov/servlets/purl/929017.
@article{osti_929017,
title = {Supersymmetry, Naturalness, and Signatures at the LHC},
author = {Kitano, Ryuichiro and Nomura, Yasunori},
abstractNote = {Weak scale supersymmetry is often said to be fine-tuned, especially if the matter content is minimal. This is not true if there is a large A term for the top squarks. We present a systematic study on fine-tuning in minimal supersymmetric theories and identify low energy spectra that do not lead to severe fine-tuning. Characteristic features of these spectra are: a large A term for the top squarks, small top squark masses, moderately large tan {beta}, and a small {mu} parameter. There are classes of theories leading to these features, which are discussed. In one class, which allows a complete elimination of fine-tuning, the Higgsinos are the lightest among all the superpartners of the standard model particles, leading to three nearly degenerate neutralino/chargino states. This gives interesting signals at the LHC--the dilepton invariant mass distribution has a very small endpoint and shows a particular shape determined by the Higgsino nature of the two lightest neutralinos. We demonstrate that these signals are indeed useful in realistic analyses by performing Monte Carlo simulations, including detector simulations and background estimations. We also present a method that allows the determination of all the relevant superparticle masses without using input from particular models, despite the limited kinematical information due to short cascades. This allows us to test various possible models, which is demonstrated in the case of a model with mixed moduli-anomaly mediation. We also give a simple derivation of special renormalization group properties associated with moduli mediated supersymmetry breaking, which are relevant in a model without fine-tuning.},
doi = {10.1103/PhysRevD.73.095004},
journal = {Physical REview D},
number = ,
volume = 73,
place = {United States},
year = {Fri Feb 10 00:00:00 EST 2006},
month = {Fri Feb 10 00:00:00 EST 2006}
}