Indiana University High Energy Physics
and Astrophysics Seminars
2001-2002 Academic Year
| Mondays, 4pm | Refreshments 3:30 pm |
| Swain West 251 | HEP Coffee Room (SW262) |
Fall Semester 2001
| Aug. 27: | Organizational Meeting |
| Sep. 3: | NO SEMINAR THIS WEEK |
| Labor Day | |
| Sep. 10: | The LHC Computing Challenge |
| Rob Gardner | |
| Indiana U. |
| Sep. 17: | Overview of Snowmass 2001 |
| Mike Berger | |
| Indiana U.
I will give an overview of the "Summer Study on the Future of Particle
Physics" held in July in Snowmass, Colorado.
|
| Sep. 24: | NO SEMINAR THIS WEEK |
| DOE site visit | |
| Oct. 1: | Is the Present the Key to the Past or the Past the Key to the Present: An Ongoing Debate in Geology as a General Problem in Historical Sciences |
| Celal Sengor | |
| Caltech
This lecture will take place Psychology 100 and the reception which will
follow in Room S201 of the Indiana Geological Survey. Dr. Sengor is a year-2000 inductee into the US National Science Academy and currently a Distinguished Moore Fellow at Caltech." Dr. Sengor's lecture is sponsored by the Horizons of Knowledge and the Sigma XI (Indiana University Chapter).
|
| Oct. 8: | |
| Oct. 15: | Search for Rare Radiative Decays of the Phi Meson |
| Craig Steffen | |
| Indiana U.
An experiment at Jefferson Lab was
proposed in 1994 to find and study
rare radiative decays of the phi(1020) meson.
This ``radphi'' experiment had several engineering runs, and
took data from May to August of
2000. The analysis of the resulting data is the topic of this
dissertation. The goal of the radphi experiment is to investigate the sub-structure of the f0(980) and a0(980) mesons, by measuring the relative rates for phi -> f0 gamma and phi -> a0 gamma. The f0 and a0 states were discovered in the 1970s, but their sub-structure is still in question. Proposed models consider these states as bound states of quark/anti-quark, four-quark, or K/Kbar molecules. The experiment used the electron accelerator at the Thomas Jefferson National Accelerator Facility in Newport News, Virginia. The experiment was located in end station B, in a 5.65 GeV endpoint tagged bremsstrahlung photon beam. The primary detector was a 620-element lead glass calorimeter. Additional instrumentation and triggering were provided by a cylindrical scintillator hodoscope and a cylindrical lead/scintillating fiber calorimeter.
|
| Oct. 22: | e+e- Linear Colliders: Update from Snowmass 2001 |
| Rick Van Kooten | |
| Indiana U. At the close of Snowmass 2001, all the physics working groups agreed upon a public statement including: "There are fundamental questions concerning electroweak symmetry breaking and physics beyond the Standard Model that cannot be answered without a physics program at a Linear Collider overlapping that of the Large Hadron Collider. We therefore strongly recommend the expeditious construction of a Linear Collider as the next major international High Energy Physics project." The current status of different machine proposals and the physics that can be achieved at a next generation e^+e^- linear collider as concluded at Snowmass 2001 are reviewed. Emphasis is placed on the benefits of a linear collider for elucidating the mechanisms for electroweak symmetry breaking. |
| Oct. 29: | |
| Nov. 5: | Light quark photoproduction results from FOCUS at Fermilab |
| Stefano Bianco | |
| Laboratori Nazionali di Frascati FOCUS (E831 at Fermilab) studies photoproduction of charm mesons and baryons at high energy. During the last fixed-target run, besides 10**6 fully reconstructed charm mesons, FOCUS has accumulated a very large sample of light quark mesons. Results are presented on the observation of a dip structure at 1.9GeV/c**2 in six-pion diffractive final state, as well as preliminary results on other channels. |
| Nov. 12: | SNAP |
| Stu Mufson | |
| Indiana University SNAP (Supernova/Acceleration Probe) is an experiment that seeks to confirm the recent remarkable cosmological result that suggests the Universe is accelerating. The clearest evidence for this result comes from the recent supernova measurements of changes in the universal expansion rate that directly show the acceleration. These measurements indicate that there is a new, mysterious energy component that causes this acceleration. The SNAP experiment itself is a satellite package designed to carry out a definitive supernova study that will determine the values of the cosmological parameters and shed light on the nature of the dark energy. |
| Nov. 19: | |
| Nov. 26: | |
| Dec. 3: | |
| Dec. 10: | New results from CLEO & the CLEO/CESR charm factory |
| Ian Shipsey | |
| Purdue University
Between 1990 and 2001 the CLEO II/II.V/III detectors at the Cornell
Electron Storage Ring (CESR) recorded in excess of 34 million
B decays and nearly 60 million charm decays. A review of the latest
results from these data sets including determinations of the
CKM matrix elements Vub, and Vcb, rare B decays, and searches
for CP violation will be presented and compared to results
from BABAR and Belle. Charm acts as a staging area, both experimentally and theoretically, for the assault on B physics. Accordingly, the CLEO collaboration is preparing a proposal to operate CESR and CLEO, as a Charm & QCD factory "CESR-c/CLEO-c" in the center of mass energy range between 3-5 GeV. The proposal was discussed extensively at Snowmass 2001. Data taking in this energy range is planned to begin in January 2003. Data samples of 1-3 fb-1/yr are expected at the Psi(3770) (~6 million tagged D decays) & above the D_s pair threshold (0.3 million tagged D_s decays). This will allow the direct determination of charm decay constants and the CKM matrix elements V_cd and V_cs to a precision of several percent and charm absolute branching ratios to 1-3%. Together with lattice QCD and B factory data, CLEO-c will greatly impact the precision with which V_ub, V_td, and V_ts can be determined. Searches for D mixing, rare decays and CP violation in the charm sector will also be performed. In a year's run, over 1 billion J/Psi's can be produced at CESR allowing searches for glueballs and hybrids with greatly improved sensitivity. When J/Psi data is combined with data to be taken later this year at the narrow Upsilon resonances, unique precision information will be obtained that will be a rich and efficient testing ground for lattice QCD. The potential exists to significantly advance our understanding and control over strongly-coupled, non-perturbative quantum field theories in general and QCD in particular. An understanding of strongly-coupled theories will be a crucial element in helping to interpret new phenomena at the high energy frontier. |