Physics working group workshop #1
14th
to 21st November 2005
Department
of Physics, Blackett Laboratory, Imperial College London
Exhibition Road , London , SW7 2AZ
Second bulletin
1. Goals, and preparatory tasks for the workshop
The Physics working group of the international scoping study (ISS) met for the first time during the first ISS plenary meeting (CERN, 22 – 24 September). The objectives for the working group were discussed and agreed. Further, in order to prepare for the first workshop, a set of preparatory studies to be performed in time for the first workshop was defined. The tasks were chosen as necessary first steps towards the physics group’s overall goals.
The preparatory tasks by sub-group are listed below. Those wishing to contribute to particular areas should contact the persons coordinating a particular activity (email contacts are given below).
Theoretical subgroup
The primary goal of the theoretical working group is to develop robust arguments motivating the need for the precision measurements of the properties of the neutrino. The arguments must be developed in such a way that they can be made accessible to general, scientifically literate, audiences (readers of New Scientist or Scientific American, for example), yet be technically and theoretically sound so that they survive the scrutiny of our peers.
In preparation for the first workshop, the following will be
attempted:
· To evaluate the likelihood that a robust
argument can be made for the proposition ‘precision measurements of the
properties of the neutrino are required to understand the origin of the
Universe’. S. King (s.f.king@southampton.ac.uk) agreed
to make a first survey of the argument;
· To review the link between possible lepton-number
violating interactions occurring at a large mass scale and the large mass
difference between the neutrinos and the charged leptons and quarks. In
addition, models that explain the large neutrino-mixing angles will also be
reviewed. A. de Gouvea (degouvea@northwestern.edu) agreed
to make a first pass at presenting this review.
Phenomenological subgroup
One of the goals of the phenomenological subgroup is to understand the measurement precision required to investigate models of neutrino mass. Such models often predict relationships between the neutrino and quark mixing-matrix elements or that the neutrino mixing matrix is not unitary. To prepare for the first workshop, it was agreed that a preliminary review of the precision required to test the various theoretical models that yield a non-unitary three-flavour neutrino mixing matrix would be presented O. Yasuda (myasuda@phys.metro-u.ac.jp) agreed to coordinate work on this topic.
Experimental subgroup
The experimental subgroup is required to make realistic estimates of the precision and sensitivity of the various proposed facilities on their own and in combination. The eventual goal is to make a critical performance comparison under various assumptions (such as large, and small, q13). This is a big task, and it was agreed that, for the first workshop, a comparison of the various codes would be presented for a small number of reference scenarios and assumptions. It was agreed that P. Huber and K. Long would provide documented GLoBES Abstract Experiment Definition Language (AEDL) files for the following baseline scenarios:
· Second-generation super beam:
– Beam of the ‘SPL type’, the ‘T2K type’, and the ‘NOnA type’;
– Megaton water Cherenkov, baselines to be defined.
· Beta beam:
– Helium/neon beta beam in which the relativistic g of the ions takes the values (100/100) and (350/350). This corresponds to a ‘reference’ beta beam and a ‘green-field site’ beta beam;
– Baselines for the two beta-beam facilities of 130 km and 700 km respectively will be assumed;
– Megaton water Cherenkov detector for (100/100)&130 km option, the detector for (350/350)&700 km option to be defined.
· Neutrino factory:
– Two Neutrino Factory options with muon energies of 20 GeV and 50 GeV respectively. Assume that each facility will provide 1021 muon decays per year;
– Baselines of 1000 km and 3000 km;
– 100 kTon magnetised calorimeter.
For the comparison of the various codes, it was agreed that the sensitivity in the q13 - d plane would be used. The following teams agreed to prepare results for comparison:
· Globes: P. Huber, P. Harrison
· ‘
· ‘
The goal is to establish a baseline for the development of an evaluation of the performance of the facilities and a road-map for the combination of the simulated results.
Muon Working Group (coordinated by Lee Roberts, roberts@bu.edu)
Muon Theoretical subgroup: The theoretical working group is to develop robust arguments motivating the need for the precision measurements to search for and/or study the properties of lepton flavour violation in the charged lepton sector, as well as to motivating the search for a permanent muon electric dipole moment.
Muon Experimental
subgroup: The experimental
opportunities available with the very intense beams possible at a neutrino
factory will be explored with a focus on beam requirements for these major
experiments. We will need to establish a
liaison with the machine group, to understand how these intense muon beams can
coexist with the neutrino program.
Input from Detector working group
In addition to the tasks the Physics working group set
itself, the need for a close dialogue with the Detector working group was
clearly identified at the CERN meeting. To allow detailed discussions to take
place, specific contributions to the workshop on the performance of the various
detector technologies will be solicited.
2. Organisation
The workshop will be organised as a working meeting with the emphasis on time for informal discussions and periods of analysis of code development. It is not expected that all participants will attend the workshop for the full week. It is hoped that a core group of people will be able to stay for much of the week so that those who can come only for a few days can still make a contribution.
A block diagram of the meeting is shown below. A detailed
agenda for the first day and the discussion with the Detector working group
will be posted in due course. The detailed agenda for the second and subsequent
days of the workshop will be influenced by the wishes of those who attend. The
workshop is scheduled to finish at 13h00 on
3. Workshop site
The workshop will be held in the Physics Department of
Imperial College London (the Blackett Laboratory). The Blackett Laboratory is
located in
4. Registration
Details of how to register will be posted on the ISS web-site (http://www.hep.ph.ic.ac.uk/iss) shortly. Please note that accommodation should be booked separately as described below.
5. Accommodation
Accommodation should be booked directly with the Imperial College Conference Office. All the hotels on their list are within walking distance of the Blackett Laboratory and may be reserved at discounted prices. Please consult the Conference Office web site, http://www.imperial-accommodationlink.com, for further information.
6. Transportation
For directions to
7. Correspondence
All correspondence concerning travel to the workshop and accommodation should be addressed to:
Piera Brambilla, ISS Physics Workshop #1
High Energy Physics Group
Blackett Laboratory, Department of Physics
Imperial College London
Exhibition Rd
LONDON SW7 2AW
Tel: +44(0)207 594 7824
FAX: +44(0)207 823 8830
Email: p.brambilla@ic.ac.uk