14 research outputs found
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TASI 2006 Lectures on Leptogenesis
The origin of the asymmetry between matter and anti-matter of the Universe has been one of the great challenges in particle physics and cosmology. Leptogenesis as a mechanism for generating the cosmological baryon asymmetry of the Universe has gained significant interests ever since the advent of the evidence of non-zero neutrino masses. In these lectures presented at TASI 2006, I review various realizations of leptogenesis and allude to recent developments in this subject
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Searching for bosons decaying to gluons
The production and decay of a new heavy vector boson, a chromophilic Z{prime} vector boson, is described. The chromophilic Z{prime} couples only to two gluons, but its two-body decays are absent, leading to a dominant decay mode of Z{prime} {yields} q{bar q}g. The unusual nature of the interaction predicts a cross-section which grows with m{sub Z{prime}} for a fixed coupling and an accompanying gluon with a coupling that rises with its energy. We study the t{bar t}g decay mode, proposing distinct reconstruction techniques for the observation of an excess and for the measurement of m{sub Z{prime}}. We estimate the sensitivity of current experimental datasets
Deep Underground Science and Engineering Lab: S1 Dark Matter Working Group
A study of the current status of WIMP dark matter searches has been made in
the context of scientific and technical planning for a Deep Underground Science
and Engineering Laboratory (DUSEL) in the U.S. The table of contents follows:
1. Overview
2. WIMP Dark Matter: Cosmology, Astrophysics, and Particle Physics
3. Direct Detection of WIMPs
4. Indirect Detection of WIMPs
5. Dark Matter Candidates and New Physics in the Laboratory
6. Synergies with Other Sub-Fields
7. Direct Detection Experiments: Status and Future Prospects
8. Infrastructure
9. International Context
10. Summary and Outlook
11. AcknowledgmentsComment: Final working group report of 17 Feb 2007 updated to address reviewer
comments (Latex, 32 pages
Report of the 2005 Snowmass Top/QCD Working Group
This report discusses several topics in both top quark physics and QCD at an
International Linear Collider (ILC). Issues such as measurements at the
threshold, including both theoretical and machine requirements, and
the determination of electroweak top quark couplings, are reviewed. New results
concerning the potential of a 500 GeV collider for measuring
couplings and the top quark Yukawa coupling are presented. The status of higher
order QCD corrections to jet production cross sections, heavy quark form
factors, and longitudinal gauge boson scattering, needed for percent-level
studies at the ILC, are reviewed. A new study of the measurement of the
hadronic structure of the photon at a collider is presented. The
effects on top quark properties from several models of new physics, including
composite models, Little Higgs theories, and CPT violation, are studied.Comment: 39 pages, many figs; typos fixed and refs added. Contributed to the
2005 International Linear Collider Physics and Detector Workshop and 2nd ILC
Accelerator Workshop, Snowmass, Colorado, 14-27 Aug 200
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Low scale seesaw, electron EDM and leptogenesis in a model with spontaneous CP violation
Strong correlations between leptogenesis and low energy CP violating leptonic processes have been shown by us to exist fin the minimal left-right symmetric model with spontaneous CP violation. In this note, they investigate the implications of this model for the electric dipole moment of the electron. With an additional broken U(1){sub H} symmetry, the seesaw scale can be lowered to close to the electroweak scale. This additional symmetry also makes the connection between CP violation in quark sector to that in the lepton sector possible