Supersymmetry Studies: University of Colorado-Boulder
To date, experiments in particle physics have yielded a model of
the elementary particles (quarks and leptons) and forces (
electro-magnetic, weak, and strong) of matter- the Standard
Model. To date, the force of gravity has not been integrated with
this Standard Model, becoming one of the future aims of our investigations.
While the SM does much to explain the fundamental nature of
matter, it is still incomplete because it still cannot fully explain the
nature of the world. As we enter the next century, physicists will seek to
piece together many different theories of particle physics into a single
unified theory which will explain the true nature of the world. One attempt
at such a unification has come through the development of the theory of
strings, which incorporates all forces, including gravity, in a unifying
structure. One of the major predictions of strings, which might be tested
at accessible energies, is the existence of supersymmetry. Supersymmetry
helps to avoid the quadratic divergence of the Higgs mass renormalization.
Another way to state this is to say that it avoids the need to introduce
renormalization counter terms which require an accuracy of many
significant figures so that the calculated mass agrees with the expected
Higgs mass of at most 250 GeV as predicted by the SLD and LEP experiments.
This is known as the ``fine tuning problem''.
Supersymmetry, if the masses are in the region of approx. 0.5 to 1.0 TeV,
helps dramatically to achieve the unification
of the coupling constants at the Grand Unification scale.
Supersymmetry states that every elementary particle has a supersymmetric
partner with equal mass but a spin differing by 1/2 unit. The only problem
is that supersymmetry cannot be observed at the energies at which current
particle colliders operate. So it is necessary to build a new collider
capable of reaching energies higher than anything we've ever seen
before. The LHC is such a machine. Nevertheless, it is likely that the
LHC may not be able to elucidate the nature of the observations. An e+e-
Linear Collider would be able to complement the LHC obervations and provide
the way by which Supersymmetry is fully analyzed.
The Supersymmetry Study Group at the
University of Colorado-Boulder Past and Present
Toshinori Abe, Michelle Backus, James Barron, Kristina
Callaghan, Brian Camley, Shirley Choi, Nick Danielson, Derek DeSantis,
Mihai Dima, Bradford Dobos, Tyler Dorland, Keith Drake, Michael Duckwitz,
Joshua Dunn, Tera Dunn, Joshua Elliott, Edward Estrada, Sal Fahey, Kevin
Fiedler,Frank Gaede, Christopher Geraci, Jack Gill, Elizabeth Goodman,
Jeremiah Goodson, James Gray, Jason Gray, Maria Parson Gulda, Benjamin
Haber, Luke Hamilton, Andrew Hahn, Stephen Hill, Alec Jenkins, Anthony Johnson,
Brian Julsen, Eric Jurgenson, Rory Kelly, Lyron Kopinsky, Nathan Koral,
Eric Kuhn, Connor Long, Irene Liu, Ning Lyan, Alfonso Martinez, Robert Midlil,
Kyle Miller, Sarah Moll, Martin Nagel, Uriel Nauenberg, Bonna Newman,
Gleb Oleinik, Archie Paulson, Matthew Phillips, Aaron Preston, Joe Proulx,
Dan Pyziak, Scott Rice, William Ruddick, Elliot Smith, Jesse Smock,
David Staszak, Paul Steinbrecher, Matthew Stolte, Chris Takeuchi, Jacob Taylor,
Aaron Tremback, Tara Turner, Jonathan Varkowitzky, Christopher Veeneman,
David Wagner, Deborah Weber, Brook Williams, Jessica Wolfe, Francis Kiwon Yi,
Our group at the University of Colorado-Boulder is interested
in investigating the opportunities and capabilities of a high energy (500 GeV
or higher) electron-positron collider. We have been carrying out a simulation
study of the production and subsequent decay of supersymmetric particles
produced in a linear collider to determine how to uncover the signal and
measure the masses of these particles.
Click on the appropriate link to see:
- some basic information regarding the study of particle
physics, the Standard Model, supersymmetry, and collider development
- information relevant to the studies and projects of our group
Paul Grannis has carried out an
interesting analysis to determine the accuracy with which we can carry out the
various measurements of SUSY particles under a set of SUGRA parameters similar to
the SPS1 set (see previous information relevant) for a given integrated luminosity.
The analysis carried out by the Texas A&M University Group Report T. Kamon, R. Arnowitt, B. Dutta, and V. Khotilovic
that shows the importance of having detectors covering the solid angle down to
very small angles in order to remove the backgrounds that affect the
observation of SUSY signals.
the SUSY signal analysis made by our
group at CU.
We have carried out a detailed simulation of the BeamCal
detector in the International Linear Collider to determine the resolution
and efficiency of the BeamCal in observing the Electron/Positron signal
from the Two Photon Process in the presence of the beamstrahlung
background. This work is shown
We are now starting to build a sample electromagnetic and or
hadronic calorimeter to study the resolution of our design. The
electromagnetic mode is based on a sandwich of scintillator tungsten. The
measurements by our CU group are shown here.
the calorimetric resolution studies made by our group at CU.
the two photon from pi-zero decays separation studies made by
our group at CU.
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