Indiana University High Energy Physics

and Astrophysics Seminars

2003-2004 Academic Year
 

Mondays, 4pm  Refreshments 3:30 pm
Swain West 238 HEP Coffee Room (SW262)

Organizers: Mike Berger and Mark Messier
 


 

Fall Semester 2003
 
 
 

Sep. 1: NO SEMINAR THIS WEEK
Labor Day


 

Sep. 8: Degenerate Fermions in Slightly More than One Dimension
Brett Altschul
Indiana U.

In one spatial dimenion, a system of low-temperature fermions displays many remarkable properties. The coherent fermion-hole excitations of the system behave like bosons, with a spectrum that remains exactly solvable even in the presence of certain arbitrarily strong interactions. This phenomenon is described by the Luttinger and Tomonaga-Luttinger models. I shall review these models and then move on to consider the corrections to their results that arise when the one-dimensional system is embedded in the real three-dimensional universe. These corrections, which can be obtained in several complementary ways, have obvious applications to the future study of low-temperature fermion trapping.


 

Sep. 15: The New Ds States: the view from CLEO
Jon Urheim
Indiana U.

This past April, the BaBar Collaboration announced the surprising discovery of a new narrow resonance decaying to Ds+ pi0. Within a month, confirmation of this state as well as evidence for the existence of a second narrow Ds state were reported by CLEO. Confirmation and further elucidation of the properties of both states came from the Belle Collaboration shortly thereafter. I will summarize the experimental developments, present the evidence for the two states, and talk about why the new states were not expected (but perhaps should have been).


 

Sep. 22: Revisiting Yukawa Unification
Kazuhiro Tobe
University of Michigan

Minimal SO(10) Supersymmetric Grand Unified Theory (SUSY GUT) is one of interesting candidates for physics beyond the standard model: all quarks and leptons (including right-handed neutrino) in one generation are unified into 16-dimensional representation of SO(10), and two Higgs doublets in SUSY standard model are also unified in 10-dimensional representation. In this talk, third family Yukawa unification, as predicted by minimal SO(10) SUSY GUTs, is revisited. Since GUT-scale Yukawa couplings are very sensitive to SUSY threshold corrections at weak scale, Yukawa unification hypothesis strongly constrains low-energy SUSY particle spectrum. I show constraints on the SUSY spectrum required for Yukawa unification. I also show that there is an interesting SUSY parameter region in which the unified Yukawa coupling is unified into the unified gauge coupling (Gauge-Yukawa unification). Gauge-Yukawa unification can be realized in higher dimensional models.


 

Sep. 29: The MIPP Hadron Production Experiment (E907)
Nick Graf
Indiana U.


 

Oct. 6: Recent Results from D0 - Part 1
Daniela Bauer
Indiana U.

The upgraded D0 detector at the Tevatron proton-antiproton collider at Fermilab has been taking data since April 2001. Since then 214 pb-1 of data have been recorded and the first physics results are beginning to emerge. At a center-of-mass energy of 1.96 TeV the Tevatron provides an excellent opportunity to study heavy quarks. In this talk I will review on-going analyses concerning the beauty and top quarks. This includes cross-section and lifetime measurements and rare decays for B-mesons and cross-section and mass measurements for the top-quark.


 

Oct. 13: Recent Results from D0 - Part 2
Kyle Stevenson
Indiana U.


 

Oct. 20: Measurement of W mass and width at LEP 2
Ambreesh Gupta
University of Chicago


 

Oct. 27: The EXO Neutrinoless Double Beta Decay Experiment
Carter Hall
Stanford University


 

Nov. 3: Cracking the CKM Triangle - BABAR's Next Step
Masahiro Morii
Harvard University


 

Nov. 10:


 

Nov. 17: The Physics and Technology of BTeV
Rob Kutschke
Fermilab

The BTeV experiment is designed to challenge the Standard Model explanation of CP violation, mixing and rare decays of hadrons containing beauty or charmed quarks, an important component in the broader study of flavor physics. The experimental apparatus will be a forward spectrometer located at the C0 collision region of the Tevatron proton-antiproton collider at Fermilab. The experiment is still being developed; installation is scheduled to start in 2006, followed by commissioning in 2008, and data-taking in 2009. This seminar will survey the physics goals of the experiment and describe how these challenges will be met by the chosen design.


 

Nov. 24: NO SEMINAR THIS WEEK
Thanksgiving Week


 

Dec. 1: Muon g-2 Experiment at Brookhaven
Jonathan Paley
Boston University


 

Dec. 3:
Wednesday
10am
SW251 		Quarkonium production at D0
Jundong Huang
Indiana U.


 

Dec. 8: On Lorentz-violating Electrodynamics
Quentin Bailey
Indiana U.

Lorentz violation is a promising probe for low-energy signals from Planck-scale physics. The Standard-Model Extension (SME) is a general theoretical framework describing effects of Lorentz and CPT violation. In this talk, I will focus on some Lorentz- violating effects arising in the photon sector of the SME. An experiment based on these effects could substantially improve the attainable sensitivity to certain types of Lorentz violation.


 

Dec. 10:
Wednesday
11am
SW251 		Measurements of the Electromagnetic Sachs Form Factors of the Proton in the Time-like Region at Fermilab
Seon-Hee Seon
University of Minnesota

E835 was a fixed target pbarp annihilation experiment at Fermilab, which was tuned at 3 GeV < E_cm < 4GeV. Here I describe the measurements on the electromagnetic structures of the proton via an exclusive process pbarp-->e+e-. We measured magnetic Sachs form factor (G_M) of the proton at s = 11.63, 12.43 and 14.40 GeV^2 via the cross section measurement of the process. The ratio of the two Sachs form factors (G_E/G_M) was measured at s = 13.56 GeV^2 via the angular distribution measurement of the process. The form factor study in E835 provides a good counterpart of the same measurements in the space-like region.