Jay Hauser: Present Research Activities
Currently the biggest problem with my web pages is that there is no satisfactory
combined web page for the research of the entire UCLA group doing research on CMS.
Besides myself, this includes Professors Robert Cousins and David Saltzberg,
plus a number of postdocs and graduate students. We work very closely and
harmoniously as a group, and it's a shame we haven't highlighted that with a web
page that is snazzy and comprehensive. Maybe some day...
Quick update in March 2014 - a lot has happened since this web page was last
seriously updated. Who has time to make a nice web page?
Some recent highlights:
- We got our CMS detector, including the CSC muon particle detection
system, up and running smoothly and with high efficiency.
Kudos to Greg and Misha for that!
- We took a lot of 7 TeV and 8 TeV proton-proton collision data.
The whole year 2010 was spent at 7 TeV, and 2011 and 2012 were years in
which data was collected at ever-increasing rates.
- We discovered the Higgs particle!
That at least answered the first
question on our "Physics Goals" list below.
- We looked for heavy stable charged particles but didn't find them :(
At least we got a publication out of that, and Chris got a PhD thesis.
- We are very busy installing new CSC detectors and refurbished
electronics in anticipation of a big data run with LHC at a higher energy
for proton-proton collisions of 13 TeV and higher rate of collisions starting in 2015.
David, Matthias, and Eric were instrumental in building the new CSC
chambers, and Andrew did a lot of work on the electronics.
- This year, I have been leading the preparation of a "Phase 2" upgrade
Technical Proposal document on behalf of all the muon detectors of CMS.
Summary as of October 2009
I work on the
Compact Muon Solenoid (CMS) experiment
(see also this
link to CMS)
Compact Muon Solenoid (CMS) experiment at the
in Geneva, Switzerland, where the World Wide Web (or just "web") was invented.
The CMS experiment looks for evidence of new particles or forces by studying high-energy collisions
between proton beams in the Large Hadron Collider (LHC) accelerator.
Currently I am spending most of my time in Geneva, serving as the Project Manager for the
part of CMS known as the Cathode Strip Chamber (CSC) muon detector.
In the past, my group has built large numbers of electronics cards for triggering (selecting)
muons with the CSC muon detector, and has done a tremendous amount of work to get this
large and complex detector running smoothly. We have also made a specialty of refining the
timing of the CSC detector.
Now as the data begins to accumulate and luminosities increase, we can start to turn our
attention to searches for new particles and forces of nature.
I work closely with UCLA professors
David Saltzberg, and
Cline, as well as
their postdoctoral researchers working on the CMS experiment.
A rather detailed picture of what my team was doing as of Oct. 2009 can be found
The types of questions we are trying to answer are:
What is the mechanism by which the symmetry of electromagnetic forces and
weak forces is "broken"? Is it the famous
or something else like
a new force (for example Technicolor)?
Do the clouds of
Dark Matter that surround the galaxies
consist of particles that
can be produced in our collisions?
If we find the Dark Matter particles, do they come from a previously-undiscovered symmetry between force
and matter particles?
Does the universe consist of 10 dimensions, of which 3 are space, 1 is
time, and 6 are curled up in tiny balls? Or maybe there are actually
11 dimensions... these are purely theoretical ideas of
Maybe, in fact, some of the extra dimensions are actually
CMS Data Analysis:
Current lines of data analysis that we are working on:
The timing accuracy of the CSC detector is being greatly refined and our group is
investigating use of CSC information
in a search for slow particles such as predicted in certain theories of Supersymmetry
(e.g. a Supersymmetric particle that is the "partner" of the tau lepton).
The CSC detector is essential for searches for ultra-high energy muons, and we
are looking into the specific issue of identifying single-muon events where the
muon has extremely large momentum. Such events can arise from the decays of
W-prime particles, but are also a generic signature for new physics.
Our group is addressing the experimental challenge of rejecting a
very high fraction of lower-momentum muons such as from the decays of W bosons.
Here is a list of selected publications:
Here is the
full list of Hauser publications.
"Precise measurement of the top-quark mass in the lepton+jets topology at CDF II,"
by CDF Collaboration (A. Abulencia et al.), Phys. Rev. Lett. 99, 182002 (2007).
"Search for Anomalous Production of Multilepton Events in
Collisions at sqrt(s)=1.96 TeV,"
by CDF Collaboration (A. Abulencia et al.), Phys. Rev. Lett. 98, 131804 (2007).
"Experience with Trigger Electronics for the Cathode Strip Chamber System of CMS,"
by Jay Hauser, Proceedings of the 10th workshop on electronics for LHC and future experiments, pp. 292-297, Boston, Sept.\
"Search for Gluinos and Squarks at the Fermilab Tevatron Collider,"
by CDF Collaboration (F. Abe et al.). Phys. Rev. D56, 1357 (1997).
"Lepton Asymmetry in W-boson Decays from
Collisions at s =1.8 TeV," by CDF collaboration.
Phys. Rev. Lett. 68, 1458-1462 (1992).
"An Experiment Addressing CP and CPT Violation in the
by I. Dunietz, J. Hauser, J.L. Rosner, Phys. Rev. D35:2166, (1987).
"Direct Measurement of Charmed D+ and D0 Semileptonic Branching Ratios,"
by Mark III collaboration. Phys. Rev. Lett. 54, 1976 (1985).
Hauser home page