| Date |
Speaker
(link
to SPIRES) |
Title
(abstract) |
13 Jan 2009
(Tu) |
|
No Seminar |
15 Jan 2009
(Th)
special date |
Matthias
R. Schindler
(Ohio U) |
Hadronic
parity violation in pionless effective field theory
Parity-violating effects provide a tool
to
study the hadronic weak interactions, and effective field theory
methods allow for a model-independent treatment of these effects. I
will present results of the analysis of parity-violating
nucleon-nucleon scattering using pionless effective field theory. This
is the first part in a program to study parity violation using pionless
effective field theory and I will also discuss the extension of this
program to electromagnetic and three-body reactions.
|
20
Jan 2009
(Tu) |
|
No Seminar
(Inauguration) |
22 Jan 2009
(Th)
special date |
Judith
McGovern
(Manchester
U, UK) |
Chiral
Perturbation Theory and Lattice QCD
This talk was prepared for a workshop
designed
to bring the UK nuclear physics and lattice communities closer
together, with an audience including a number of experimentalists. It
introduces the concept of chiral extrapolation of lattice data, with
particular reference to the nucleon mass. |
27
Jan 2009
(Tu) |
Michael
Birse
(Manchester U, UK) * |
Deconstructing
Nucleon-Nucleon Scattering (.pdf file)
|
3
Feb 2009
(Tu) |
William
M. Snow
(Indiana U) * |
Parity Violation in Neutron Spin
Rotation (.pdf file)
In
this talk I will describe the phenomenon of parity violation in slow
neutron optics, review
the reasons to attempt to measure this and other manifestations of the
weak interaction between
nucleons, discuss the recent search for this phenomenon in 4He at NIST,
and outline
future experiments to search for neutron spin rotation in H, D, and 4He
at the new
slow neutron beam under construction at NIST.
|
10
Feb 2009
(Tu) |
Ruth
van de Water
(BNL) * |
The B->pi l nu form factor and |Vub| from three-flavor lattice QCD (.pdf file) |
| 12 Feb 2009 (Th) Physics Colloquium |
Lawrence Weinstein
(Old Dominion) |
Guesstimation: Solving the world's problems on the back of a
cocktail napkin (.pdf file)
This talk will show how to estimate almost anything,
including such serious real-world questions as 'paper or plastic', how
much landfill space we need for the next century, gasoline vs electric
cars, and the total length of pickles consumed yearly in the US.
|
17
Feb 2009
(Tu) |
Richard
Arndt
(local) |
Pion
Nucleon Partial Wave Analysis- The Resonance Spectrum
The
GWU partial wave analysis of elastic PiN scattering yields a Resonance
spectrum which is in conflict with the commonly accepted Particle Data
Group values. The sources of
this conflict and our resolution of it will be discussed. |
24
Feb 2009
(Tu) |
Barry Berman
(local) |
Tumor Tracking with Dose-Rate Regulation of Multileaf-Collimator Motion
|
3
Mar 2009
(Tu) |
|
|
10
Mar 2009
(Tu) |
Andrei Alexandru
(local) |
Electrical Polarizability of the Neutron from Lattice QCD (.pdf file)
The plan is to briefly review QCD, explain why it is so difficult
to gain a quantitative understanding in the low energy regime; this is
to motivate lattice QCD. I will then present the methods of lattice QCD
and I will focus mainly on computing the hadron masses. I will then
explain how we plan to compute the electric polarizability. In the end,
if I have the time, I will talk about the challanges we have to
overcome to produce results that can be directly compared with
experiment and what are our plans to deal with these problems. |
17
Mar 2009
(Tu) |
|
No Seminar
(Spring Break) |
24
Mar 2009
(Tu) |
Peter
Winter
(U Illinois, Urbana-Champaign) * |
In a muon's
lifetime: From Fermi's constant to "calibrating" the sun (.pdf file)
The muon
group at Illinois is
performing three experiments at the Paul Scherrer Institute all
measuring the muon lifetime with high precision. The MuLan experiment
uses a simple soccer-ball like scintillator array to detect the decay
positrons. We collected twice 1012 muon decays in two different target
materials to obtain the final precision of 1 ppm which will
give
a 20 times better determination of the Fermi constant GF. A first
result was recently published [1] which already improved the precision
of GF to 5 ppm. The muon capture experiment MuCap uses a negative muon
beam stopped in a time projection chamber as an active target filled
with ultra-pure hydrogen gas. The elementary capture process \mu-+p
-> n+\nu offers a rare (0.15%) but additional
disappearance
channel. The measured difference of the positive and negative muon's
lifetime determines the rate of the capture process to a final
precision of 1%. This can be used to derive an improved value of the
proton's pseudoscalar form factor gP to 7% precision. A first result gP
= 7.3\pm 1.1 has been published [2]. This is a first precise,
unambigous determintation of gP and an important test of QCD
symmetries. Recently, we started a new experiment, MuSun [3], that will
start a first commissioning run at the end of 2008. Here, a measurement
of the \mu-+d \to n+n+\nu provides a benchmark of the understanding of
weak processes in the two nucleon-system. It was shown, that other weak
reactions involving the two nucleon system (pp \to de+\nu or \nu+d
reactions) are related to the same low-energy constant, characterizing
the two nucleon system at short distances. This constant is not well
constrained and therefore the MuSun experiment comes closest to
calibrating these basic astrophysical reactions under terrestrial
conditions.
[1] Phys. Rev. Lett. 99, 032001 (2007)
[2] Phys. Rev. Lett. 99, 032002 (2007)
[3] http://www.npl.uiuc.edu/exp/musun/documents/prop07.pdf
|
31
Mar 2009
(Tu) |
|
|
7
Apr 2009
(Tu) |
|
cancelled
|
14
Apr 2009
(Tu) |
|
|
| 21 Apr 2009 (Tu) |
Michael Kohl
(Hampton U/Jefferson Lab) |
Using Polarization Observables for Precision Measurements (.pdf file)
Accurate
measurements of fundamental physics observables relating to structure
and symmetry properties of matter are of great interest as they provide
tests of present theory and may discover new phenomena beyond. I will
discuss based on the examples of the BLAST and TREK experiments, how
the control of spin and polarization can be used to achieve high
experimental precision, e.g. in measurements of the electromagnetic
response of hadronic targets or in search of New Physics beyond the
Standard Model. |
28 Apr 2009
(Tu) |
Kazutaka Nakahara
(KEK, Japan) |
The J-PARC/MSL and the development of the Super-Omega Muon Beamline
(.pdf file)
The Materials and Life Science Facility (MLF) is currently under
construction at the Japan Proton Accelerator Research Complex (J-PARC)
in Tokai, Japan. The muon section of the facility houses the production
target and four secondary beamlines used to transport muon beams of
different energies and intensities into two experimental halls. One of
the secondary beamlines is the Super-Omega Muon Beamline, which when
completed, will produced the worlds’ most intense pulse muon beam. In
this seminar, I will describe the various physics programs expected to
take place at J-PARC/MSL, the development of a high intensity pulsed
muon beam at the Super-Omega Muon Beamline.
|
| *SPECIAL SEMINAR: 26 May 2009 (Tuesday)* | Renato Higa
(U Bonn, Germany) | Nuclear Clusters in Halo EFT
Rare
exotic nuclei have recently drawn a lot of interest not only
experimentally but also from the theoretical side, due to properties
that challenge the knowledge gained from studies of stable nuclei.
Particularly interesting is the formation of clusters and halo
structures, whose small bindings lead to threshold phenomena with
important consequences for nuclear astrophysics. In many cases the
binding among clusters is much smaller than the exitation energy of
each cluster, making them suitable systems for employing Effective
Field Theory (EFT) techniques. I will present the status of research in
this direction, with emphasis on the inclusion of Coulomb interactions.
I will then discuss results for alpha-alpha and proton-alpha systems,
followed by prospects for future studies. |
CNS Home
Nuclear Physics Seminars
