http://fafnir.phyast.pitt.edu/py3765/walkingTCReview.pdf

Strong dynamics and electroweak symmetry breaking

The Large Hadron Collider presents an unprecedented opportunity to probe the realm of new physics in the TeV region and shed light on some of the core unresolved issues of particle physics. These include the nature of electroweak symmetry breaking, the origin of mass, the possible constituent of cold dark matter, new sources of CP violation needed to explain the baryon excess in the universe, the possible existence of extra gauge groups and extra matter, and importantly the path Nature chooses to resolve the hierarchy problem - is it supersymmetry or extra dimensions. Many models of new physics beyond the standard model contain a hidden sector which can be probed at the LHC. Additionally, the LHC will be a top factory and accurate measurements of the properties of the top and its rare decays will provide a window to new physics. Further, the LHC could shed light on the origin of neutralino masses if the new physics associated with their generation lies in the TeV region. Finally, the LHC is also a laboratory to test the hypothesis of TeV scale strings and D-brane models. An overview of these possibilities is presented in the spirit that it will serve as a companion to the Technical Design Reports (TDRs) by the particle detector groups ATLAS and CMS to facilitate the test of the new theoretical ideas at the LHC. Which of these ideas stands the test of the LHC data will govern the course of particle physics in the subsequent decades.

/pdf/the-hunt-for-new-physics-at-the-large-hadron-collider-32zm4otxyw.pdf

The Hunt for New Physics at the Large Hadron Collider

We systematically calculate various flavor-changing neutral-current top-quark processes induced by supersymmetry at the Large Hadron Collider, which include five decay modes and six production channels. To reveal the characteristics of these processes, we first compare the dependence of the rates for these channels on the relevant supersymmetric parameters, then we scan the whole parameter space to find their maximal rates, including all the direct and indirect current experimental constraints on the scharm-stop flavor mixings. We find that, under all these constraints, only a few channels, through cg -> t at parton level and t -> ch, may be observable at the Large Hadron Collider.

Supersymmetry-induced flavor-changing neutral-current top-quark processes at the CERN Large Hadron Collider

▪ Abstract We survey top-quark physics from what has been learned so far at the Tevatron to the searches planned at present and future colliders. We summarize the richness of the measurements and discuss their possible impact on our understanding of the standard model by pointing out their key elements and limitations. We discuss how the top quark may provide a connection to new or unexpected physics. The literature on many of the topics we address is sizeable. We attempt to consolidate the most salient points into a complete, coherent overview.

Top-quark physics

The top quark is the heaviest elementary particle observed to date. Its large mass makes the top quark an ideal laboratory to test predictions of perturbation theory concerning heavy quark production at hadron colliders. The top quark is also a powerful probe for new phenomena beyond the Standard Model (SM) of particle physics. In addition, the top quark mass is a crucial parameter for scrutinizing the SM in electroweak precision tests and for predicting the mass of the yet unobserved Higgs boson. Ten years after the discovery of the top quark at the Fermilab Tevatron, top quark physics has entered an era where detailed measurements of top quark properties are undertaken. In this paper an introduction to the phenomenology of top quark production in hadron collisions is given, the lessons learned in Tevatron Run I are summarized and the first Run II results are discussed. A brief outlook of the possibilities of top quark research at the Large Hadron Collider, currently under construction at CERN, is included.

/pdf/top-quark-physics-in-hadron-collisions-1tkfdpidnl.pdf

Top quark physics in hadron collisions

In the framework of topcolor-assisted technicolor(TC2) models, we calculate the contributions of flavor changing scalar couplings involved the neutral top-pion � 0 and top-Higgs h 0 to the branching ratio Br(t −→ cg). We find that the value of Br(t −→ cg) can reach 1 × 10 3 with reasonable values of the parameters in TC2 models, which may be testable in the future experiments.

The rare top decay t → cg in topcolor assisted technicolor models

We discuss and estimate the contributions of the new particles predicted by topcolour-assisted technicolour (TC2) models to the muon anomalous magnetic moment aµ. Our results show that the contributions of pseudo-Goldstone bosons are very small and can be safely ignored. The main contributions come from the ETC gauge boson xµ and topcolour gauge boson Z'. If we demand that the mass of Z' is consistent with other experimental constraints, its contributions are smaller than that of xµ. With reasonable values of the parameters in TC2 models, the observed BNL results for aµ could be explained.

Topcolour-assisted technicolour models and the muon anomalous magnetic moment

We study the contributions of the technipion P0 predicted by the technicolour theory to the process e+e-→Zb. Our results show that the production cross section σ is very small. The value of the cross section σ is smaller than 3×10-3 fb for most technicolour models. It is impossible for the recent experimental results at LEPII to be explained within the framework of technicolour theory.

The colour-singlet technipion P0 and the recent experimental results at LEPII

We study the production and decay of the neutral top-pion � 0 predicted by topcolor-assisted technicolor(TC2) theory. Our results show that, except the dominant decay modes b ¯, ¯ and gg, the � 0 t can also decay into and Z modes. It can be significantly produced at high energy e + e collider(LC) experiments via the processes e + e → � 0 and e + e → Z� 0 t. We further calculate the production cross sections of the processes e + e → � 0 → ¯ and e + e → Z� 0 → Z¯ tc. We find that the signatures of the neutral top-pion � 0 can be detected via these processes.

Production and decay of the neutral top pion in high energy e + e - colliders

The flavor-changing rare top decays t→cVV in topcolor-assisted technicolor theory

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