LHC and SUSY Aug 2010 results, implications for string theory

In summary, the Large Hadron Collider (LHC) has ruled out some of the Supersymmetry (SUSY) parameter space above TeV, specifically gluinos above a certain mass. This would have been a significant discovery for strings/Supergravity Beyond the Standard Model. However, LHC is not the only experimental search for SUSY, as dark matter detectors also contribute. A comparative study has been done for different SUSY models, including the minimal (MSSM), next-to-minimal (NMSSM), and nearly minimal (nMSSM). The recent results from CDMS II have excluded a large part of the parameter space allowed by current collider constraints, and future experiments like SuperCDMS may further narrow
  • #1
ensabah6
695
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LHC thus far has ruled out some of the SUSY parameter space over and above Tev, esp gluinos above a certain mass.

So LHC has offered some useful research into SUSY. Were SUSY gluinos detected it would be a huge boost to strings/Supergravity Beyond the Standard Model

http://arxiv.org/abs/1008.0407

High Energy Physics - Phenomenology
Title: It's On: Early Interpretations of ATLAS Results in Jets and Missing Energy Searches
Authors: Daniele S. M. Alves, Eder Izaguirre, Jay G. Wacker
(Submitted on 2 Aug 2010)

Abstract: The first search for supersymmetry from ATLAS with 70/nb of integrated luminosity sets new limits on colored particles that decay into jets plus missing transverse energy. For gluinos that decay directly or through a one step cascade into the LSP and two jets, these limits translate into a bound of m_g > 205 GeV, regardless of the mass of the LSP. In some cases the limits extend up to m_g ~= 295 GeV, already surpassing the Tevatron's reach for compressed supersymmetry spectra.

Comments: 5 pages, 3 figures, 1 table
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1008.0407v1 [hep-ph]LHC is not only experimental search for SUSY, dark matter detectors also weigh inhttp://arxiv.org/abs/1005.0761
SUSY dark matter in light of CDMS II results: a comparative study for different models
Authors: Junjie Cao, Ken-ichi Hikasa, Wenyu Wang, Jin Min Yang, Li-Xin Yu
(Submitted on 5 May 2010)

Abstract: We perform a comparative study of the neutralino dark matter scattering on nucleon in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). First, we give the predictions of the elastic cross section by scanning over the parameter space allowed by various direct and indirect constraints, which are from the measurement of the cosmic dark matter relic density, the collider search for Higgs boson and sparticles, the precision electroweak measurements and the muon anomalous magnetic moment. Then we demonstrate the property of the allowed parameter space with/without the new limits from CDMS II. We obtain the following observations: (i) For each model the new CDMS limits can exclude a large part of the parameter space allowed by current collider constraints; (ii) The property of the allowed parameter space is similar for MSSM and NMSSM, but quite different for nMSSM; (iii) The future SuperCDMS can cover most part of the allowed parameter space for each model.
 
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  • #2
ensabah6 said:
The first search for supersymmetry from ATLAS with 70/nb of integrated luminosity
Still no sign of supersymmetry, now with a million times more integrated luminosity and higher energy. If it exist it must be at higher energies or have a really weak coupling to our matter.
 

FAQ: LHC and SUSY Aug 2010 results, implications for string theory

1. What is the LHC and why is it important for scientific research?

The LHC (Large Hadron Collider) is the world's largest and most powerful particle accelerator. It is located at the European Organization for Nuclear Research (CERN) and is used to study the fundamental building blocks of matter and the laws that govern them. The LHC is important because it allows scientists to conduct experiments at extremely high energies, replicating conditions that existed just after the Big Bang.

2. What are the results of the LHC and SUSY Aug 2010 experiments?

In August 2010, the LHC experiments confirmed the existence of the Higgs boson, a fundamental particle that gives other particles their mass. Additionally, the search for Supersymmetry (SUSY) particles, which are predicted by some theories of particle physics including string theory, did not yield any conclusive evidence.

3. What are the implications of these results for string theory?

The results from the LHC and SUSY experiments have both validated and challenged aspects of string theory. The confirmation of the Higgs boson supports the idea of a Higgs field, which is a key component of string theory. However, the lack of evidence for SUSY particles puts some versions of string theory in doubt, as they heavily rely on the existence of these particles.

4. How do these results impact our understanding of the universe?

The LHC and SUSY Aug 2010 results have provided valuable insights into the fundamental laws of nature and the structure of the universe. The discovery of the Higgs boson helps to explain how particles acquire mass, and the absence of SUSY particles narrows down the possibilities for theories of particle physics and cosmology.

5. What are the next steps for research in this area?

Scientists are continuing to analyze the data from the LHC experiments and are planning future experiments to further study the properties of the Higgs boson and search for evidence of SUSY particles. Additionally, researchers are working to reconcile the results with different theories, such as string theory, to gain a better understanding of the fundamental laws of the universe.

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