Purpose

NuFact05 will be the 7th Workshop of a series started in 1999.

Its general scientific background consists of:

The recent major discoveries that have proven that different flavors of neutrinos do oscillate into one another, providing the first clues of new physics beyond the standard model. They call for a complete determination of the neutrino mass splittings, of the neutrino mass hierarchy and of the neutrino mixing matrix (Pontecorvo-Maki-Nakagawa-Sakata matrix). Its yet-unknown third neutrino mixing angle $\theta_{13}$ will be precisely measured first, the ultimate goal being the measurement of its the CP violating phase d.

Recent developments of accelerator technology that are making possible to conceive of superior neutrino beams, based on the conventional concept of a pion decay tunnel,  as well as on the novel concept of a storage ring for longer lived high energy neutrino parents, for which the options of muons and radioactive ions are being investigated. All options rely on emerging technologies promising high-power proton accelerator beams of multi MegaWatt power and share the technical challenge of handling and exploiting efficiently this unprecedented high power.

The purpose of the Workshops is to bring together yearly the world wide communities that in the different regions of the world work towards the long term goal of constructing new superior accelerator-based neutrino facilities.

## This includes novel facilities:

• Neutrino Factories based on muon storage rings(1). High-energy neutrino beams with high-intensity and quality could be produced from decays of the muons, after those are accelerated and stored in a muon storage ring. The technical challenge relies in the manipulation of muon beams through phase rotation, ionization cooling, acceleration and storage.
• Neutrino Betabeams based on radioactive ion storage rings(2). Low and medium energy neutrino beams with high-intensity and quality could be produced from decays of the radioactive , ions after those are accelerated and stored in a storage ring. The technical challenge relies in the production and manipulation of ion beams through collection, preacceleration, acceleration, bunch merging and† storage.
• As well as conventional neutrino beams of unprecedented power(Superbeams). Low and medium energy neutrino beams with useful intensity and quality are and will still be produced via pion decay.

On the road that will lead us there, the present goal is to stimulate, plan and review the work necessary to prepare, after a comparison of options on a common basis of performance and cost , the proposal of a major accelerator-based facility for neutrino physics, before the end of the decade. The Workshop sets to itself a number of shorter term goals to achieve from one year to the next. The proposal of the Nufact05 Scientific Programme Committee will be made available here soon. Examples of possible goals suggested for next year and expressed as questions:
Proton driver beam energy: What are the possibilities offered as function of energy?
What are the requirements (optimum?) for superbeam, beta-beam, neutrino factory, others?
Can one define a set of common units for cost and performance comparisons?
What is the necessary detector R&D programme?
Where do we stand with the accelerator R&D programme?
Is it complete & sufficient ?
A World Wide Design study?

The Workshop returns to Europe in 2005, with the regular 3-year cycle, in a promising context of renewed consensus towards ambitious projects in the sector. It wants therefore to provide also the opportunity of discussing the most effective specific road map for Europe in the area of accelerator neutrinos.
The NuFact05 workshop consists of a mixture of plenary talks and parallel working group sessions. Possible topics for plenary presentations include:

* Physics of Massive Neutrinos
* Prospects for $\theta_{13}$ Measurements at Future Reactors
* Long Baseline Neutrino Oscillation Experiments with Superbeams
* Oscillation Neutrino Physics Reach at Neutrino Factories
* Non-oscillation Neutrino Physics
* Particle Physics with Intense Muon Beams
* Application with Intense Muon Beams
* Muon Collier prospects
* Hadron Beam Physics at Highly Intense Proton machines
* Applied Science with Highly Intense proton beams
* Neutrino Factory R&D in the US, Europe and Japan
* Beta Beam R&D
* MICE
* MUCOOL
* MuSCAT
* Targetry R&D
* Neutrino Detector
* Leptogenesis
* Neutrino and Cosmology