The Workshop on Low-Energy Precision Electroweak Measurements was held at TRIUMF, April 4 - 6, 2002. There was an excellent series of talks and discussion was lively.
Against this backdrop, an array of new precision measurements - either underway or being planned - will provide additional insights about the shape of the "new" Standard Model. These measurements include: the neutron lifetime and beta-decay correlation coefficients; the pion beta-decay branching ratio; the weak charges of the electron and proton; "isotope ratios" in atomic parity violation; the Michel parameters in muon decay; and mu to e conversion in the nuclear domain.
The objectives of the workshop were to bring together a group of particle,
nuclear, and atomic theorists and experimentalists to address two primary
questions:
To address these questions, the workshop included speakers representing
both the low- and high-energy perspectives. Attendance and participation
in the workshop exceeded all expectations. Details of the program
of the workshop and copies of the transparencies
shown during the various discussions can be found later on this website.
The workshop concluded with a Panel Discussion with open participation,
which resulted in the following specific recommendations:
(I) Establish a Working Group dealing with low energy precision electroweak measurements. Michael J.Ramsey-Musolf and Jens Erler were charged with organizing this Working Group of experimentalists and theorists. The purpose of the Working Group is
- to create a coherent and noticeable "voice" for this emerging subfield; many experimental efforts are ongoing worldwide at various different facilities. The Working Group is to provide cohesion to these efforts.
- to ensure proper representation of these efforts at major meetings by proposing invited talks, topical sessions, and so on.
- to organize its own workshops on a regular basis (with a frequency of once every two years?).
- to establish a website with:
a listing of important measurements at an easily accessible site;
a file with the more
important graphical depictions, like 
versus Q2;
a listing of links
to experiments;
a listing of links to relevant experimental and theoretical publications.
- to produce an annual progress report.
- to fulfil the role of advocacy for this emerging subfield where required.
(II) Strongly encourage an increase in the funding supporting the subdiscipline. It was noted that there are at present very few permanent theory positions for the subdiscipline. It is apparent that a preponderance of electroweak radiative corrections have to be calculated to realize full impact of the precision electroweak measurements program.
In summary, the workshop placed great emphasis on performing precision electroweak measurements testing various aspects of the Standard Model, e.g., neutron beta-decay and the question of unitarity of the CKM matrix; nuclear beta-decay and extraneous interactions with right-handed gauge bosons; atomic parity violation, parity violating Moeller scattering, parity violating electron-proton scattering (and their intercomparison), as well as high energy collider efforts (the latter at Q2 values beyond the Z0 pole) and the search for a superweak force; g - 2 of the muon and the question of supersymmetry; the muon decay Michel parameters and right-handed gauge bosons; deep inelastic neutrino nucleus scattering (is the anomaly a mere isospin effect?); improved precision measurements for various kaon decays. Clearly this is a multifaceted program of experiments and one can add to this several other experiments, like the searches for electric dipole moments, double beta-decay searches, and CP nonconservation, which were not discussed at the workshop. The complementarity of the lower energy experiments with very high energy experiments need to be stressed. The experiments are extremely challenging and require great attention to detail. Theoretical predictions require sophistication in particular where it concerns radiative corrections. Almost all experiments have lurking hadronic effects at some level. There is a paucity of in depth evaluations of hadronic structure effects.
Certainly the Standard Model is a restricted concept of an ultimate
description of the physical world. There are indications of the physics
beyond the Standard Model. The recent data on solar and atmospheric neutrinos
gives evidence of new physics. The quest for such physics is to be pursued
vigorously. This requires that substantial resources and funding be made
available. The emerging subdiscipline of low energy precision electroweak
measurements invokes great excitement and presents a great challenge! It
is to be noted that in the latest Nuclear Science Advisory Committee Report
the searches for physics beyond the Standard Model is categorized by the
nuclear physics community as one of four forefront research thrusts to
be pursued in the immediate future.
| Roger Carlini | Jlab | carlini@jlab.org |
| John Ng | TRIUMF | misery@triumf.ca |
| Michael J. Ramsey-Musolf | Caltech | mjrm@krl.caltech.edu |
| Willem T.H. van Oers | Manitoba | vanoers@physics.umanitoba.ca |
Talks will be added as they become available
Svetlana Barkanova [200
KB PDF]
Radiative Corrections and Parity Violating Electron-Nucleus Scattering
John Behr [3.4 MB PDF]
Atom Trap Studies of Beta Decay
Dmitry Budker [440 KB
PDF] [910 KB
PowerPoint]
Atomic Parity Violation Experiments
Jens Erler [370 KB PDF]
Electroweak Model and Constraints on New Physics
Jonathan Feng [1 MB PDF]
Muon Properties and Supersymmetry
Emil Frlez [440 KB PDF]
Preliminary Results from the PIBETA Experiment at PSI
Susan Gardner [226 KB PDF]
Probing Fundamental Interactions in Neutron Decay
Tim Gorringe [705 KB PDF]
uLan - A Precision Measurement of the Muon Lifetime
John Hardy [209 KB PDF]
Superallowed 0+ -> 0+ Beta Decay and
CKM Unitarity
Jeff Martin [830 KB
PDF] [3.3 MB PowerPoint]
Measurement of A-correlation in Beta-decay of Ultra
Cold Neutrons
Jeff Martoff [730 KB
PDF]
Elastic Scattering of Low Energy Neutrinos: Direct Measurement of
Hadronic Weak Neutral Coupling
Gerco Onderwater [7.4
MB PDF] [3.1
MB StarOffice]
Precision Measurement of the Positive Muon Anomalous Magnetic Moment
Michael Ramsey-Musolf [1.1
MB PDF]
Precision Low Energy Measurements and Supersymmetry
John Ng [77 KB PDF]
Some Low Energy Precision Tests of Brane Models
Nate Rodning [23 MB PDF]
TWIST, a Precision Measurement of Muon Decay
Heidi Schellman [1 MB
PDF]
Measurement of 
with the NuTeV Neutrino Experiment
Scott Wiburn [390 KB PDF]
Neutron Beta-decay with a Pulsed Cold Neutron Beam
Graham Wilson [940 KB PDF]
Prospects for High Energy Collider Electroweak Measurements
Mike Woods [1.7 MB PDF]
The SLAC E158 Experiment: Measuring Parity Violation in Moller Scattering
Against this backdrop, an array of new precision measurements -- either underway or being planned - will provide additional insights about the shape of the "new" Standard Model. These measurements include: the neutron lifetime and b-decay correlation coefficients; the pion b-decay branching ratio; the weak charges of the electron and proton; "isotope ratios" in atomic parity violation; the Michel parameters in muon decay; and m to e conversion in the nuclear domain.
The goal of the workshop is to bring to together a group of particle, nuclear, and atomic theorists and experimentalists to address two primary questions:
(a) In what ways do precision low-energy measurements and high-energy collider studies (Tevatron, LHC, Tesla, etc.) provide complementary information about new physics?
(b) What theoretical and experimental work should be undertaken to insure that low-energy measurements can be cleanly interpreted in terms of new physics?To address these questions, the workshop will include speakers representing both the low- and high-energy perspectives. At the same time, the development of one or more focused working groups geared toward addressing the workshop goals, will be discussed. The workshop will conclude with a panel discussion and formulation of recommendations for future theoretical and experimental work.
Registration starts Thursday at 12 noon outside the TRIUMF auditorium
in neutrino and anti-neutrino scattering, Heidi
Schellman ,
Since discussions are of great importance for these types of Workshops, ample time has been scheduled for these. Thus each time slot of 45 minutes has a maximum of 30 minutes for the actual presentation and a minimum of 15 minutes for discussion. The Workshop ends with a panel discussion and the formulation of a set of recommendations for future experimental and theoretical work.
A
Workshop dinner will be held at Bridges
Restaurant on Granville Island
on Friday evening at 19:30. With no registration fee, the Workshop the
Organizers need to ask you to sign up for the Workshop dinner at your earliest
convenience. If you wish to pay by credit card, please click
here to use our secure server to pay on-line , or
print a copy of the dinner payment form [ PostScript
or PDF ] and send it
to Elly Driessen by FAX (604-222-1074) or mail (TRIUMF, 4004 Wesbrook Mall,
Vancouver, BC, V6T 2A3) .
A
block of rooms has been reserved at a completely restored landmark downtown
hotel, the Crowne
Plaza Hotel Georgia Vancouver, for
the nights of April 4, 5 and 6, 2002. The special conference rate is $119
per night for single or double occupancy. The rates are net, non-commissionable
and are quoted in Canadian dollars. Rates are subject to the BC hotel tax
of 10% plus a GST of 7%. Hotel reservations should be made by calling
the
hoteldirectly and identifying oneself as participating
in the TRIUMF LEPEM Workshop. Reservations should be made before
Thursday, March 7, 2002 to guarantee availability.
The workshop will be held at the TRIUMF auditorium in the main office building. Bus service to TRIUMF is very poor, so you will probably want to share a taxi or a rental car.
To get to TRIUMF from the hotel, go south on Howe, which then swings slightly left onto the Granville bridge. Cross the Granville bridge and continue south on Granville to 16th. At 16th Ave, turn right and proceed west along 16th. Near the westernmost end of 16th, you enter the UBC endowment lands and the old forest of Pacific Spirit Regional Park . Once you pass the Park Information center, watch for a sign that directs you South (left) to TRIUMF or North (right) to UBC. At the Wesbrook Mall traffic light you go left to TRIUMF or right to UBC gate 10. TRIUMF is 900 m from 16th as shown on this map .
To get to TRIUMF from the YVR airport proceed as if you are going to Vancouver, and take the Granville Street exit from the Arthur Laing bridge. Shortly afterwards, turn left on W 70th Ave., which becomes Southwest Marine Drive. Follow Southwest Marine Drive. Once you reach the four lane divided section of Marine Drive through the forest of the UBC endowment lands, keep an eye open for a sign that will direct you right to TRIUMF (along 16 th avenue). Shortly after this turn, another sign directs you right again on Wesbrook mall to TRIUMF. TRIUMF is 900 m from 16th as shown on this map .
If you are going to the Hotel straight from the YVR airport, you will
want to stay on Granville until you cross the Granville bridge. Then exit
onto Seymour St. and continue to Georgia. Turn left and arrive
at the hotel Georgia in two blocks.
| Roger Carlini | Jlab | carlini@jlab.org |
| John Ng | TRIUMF | misery@triumf.ca |
| Michael J. Ramsey-Musolf | Caltech | mjrm@krl.caltech.edu |
| Willem T.H. van Oers | Manitoba | vanoers@physics.umanitoba.ca |
