|Particle Physics and Cosmology (PPC)||[PPC 2012 (???)] [PPC 2011 (CERN)] [PPC 2010 (Univ. of Torino/INFN)] [PPC 2009 (Univ. of Oklahoma)] [PPC 2008 (Univ. of New Mexico)] [PPC 2007 (TAMU)] [Big Bang Theory ]|
This program at Texas A&M aims to solve the mysterious dark matter puzzle of the universe,
one of the major unresolved questions in astronomy.
With signals from the collider and the Milky Way,
one can understand the nature of the early universe at a ten billionth of a second
after the Big Bang, and thus unify the two fields of particle physics and early universe cosmology.
The program is possible by a unique collaboration between the phenomenology theory group of
Arnowitt, Dutta, and Nanopoulos and three distinct international experimental programs:
(a) Compact Muon Solenoid (CMS) at the Large Hadron Collider (LHC) by Kamon, Safonov, and Toback;
(b) the Large Underground Xenon (LUX) dark matter experiment
at the new Deep Underground Science and Engineering Laboratory (DUSEL) by Mohapatra, Webb, and White;
(c) and the Alpha Magnetic Spectrometer (AMS) experiment at the International Space Station by McIntyre.
Further, McIntyre has proposed the "100-TeV collider," which is seven times more powerful than the LHC,
to enhance the future PPC program.
"Partcle Physics and Cosmology (PPC)" - T. Kamon designed this "PPC" cube for the 2nd international conference on PPC (PPC08)(*) to visualize the interconnection between particle physics and cosmology. See public talks for more details. If you are interested in more scientific talks, see here. (BTW: This cube was inspired by my 12-yrs. old daughter who was watching "Transformers Movie" with me.) See also the "Standard Model" cube (Window Movie).
(*) The PPC conference was founded by Arnowitt, Dutta and Kamon in 2007, where Dutta and Kamon were co-chairs of PPC07.
|Cosmology at Colliders
- Hunting for Dark Matter at the LHC -
There is enough evidence for the existence of the dark matter (DM) in the universe.
A recent precision astromonical measurement by
Wilkinson Microwave Anisotropy Probe (WMAP) reveals that 23% of the universe
(or Ω = 0.23) is composed of cold dark matter (CDM).
However, we still don't known what the CDM is.
Particle physics theorists have been trying to construct new models
that are consistent with the Standard Model (SM),
but includes a CDM candidate paricle.
Supersymmetry (SUSY) uniquely opens the possibility to directly connect the SM with an ultimate unification of the fundamental interactions. When combined with supergravity grand unification (SUGRA GUT), it resolves a number of problems inherent in the SM and predicts grand unification at the GUT scale MGUT ~ 1016 Giga-electron-Volts (GeV), subsequently verified at LEP.
A minimal framework of supergravity model (the minimal supergravity or mSUGRA model) is consistent with all existing experimenatal data and provides a leading candidate for CDM observed in universe. Ω = 0.23 constrains mSUGRA model, suggesting four distinct parameter regions: coannhilation (CA) region, focus point (FP) region, A-funnel region, and bulk region. "SUSY mass" spectra in each region are unique. This means we have to employ different experimental techniques to probe all four.
Can we search for dark matter in laboratories? Yes. If SUSY is correct, the Large Hadron Collider (LHC) at CERN is powerful enough to produce SUSY paricles including the SUSY dark matter particle in proton-proton (pp) collisions at 14 Tera-electron-Volts (TeV). Two detectors (ATLAS and CMS) will be ready to detect the collisions in fall 2008. Each experimentist must be a super-detective who can solve the mysterious dark matter puzzle from millisons of trillions of pp collisions.
In 2002, R. Arnowitt, B. Dutta, and T. Kamon launched a global phenomenology project to study cosmologically-motivated SUSY signals at 3 colliders: (a) Tevatron, (b) ILC and (c) LHC.
Within the mSUGRA model in standard cosmology, there are four regions that are equally motivated. Taking into account the measurements of anomalous muon magnetic moment and Br(b → s γ), they began with the CA region at the Tevatron and the ILC in 2002, followed by studies at the LHC in 2004. Further in 2007, their studies were expanded by including mSUGRA signals in non-standard cosmology. Fruitful collaboration with other colleagues amplified the publication productivity. Below are papers and progress:
 Non-universarity case
 "Focus Point" case
 "Mirage-mediation" case