June2001-ParticlePhysicsandParticleAstrophysics.pptVIP

Status of the HARP Experiment Chris Booth University of Sheffield Outline Motivation Neutrino Physics Muon storage ring design Requirements and Design Acceptance Particle identification History and Status Results from the technical run Current status Motivation – Neutrino Physics! Conventional accelerator ? beams p N ? ?+ X ? ?+ ?? ? e+ ?e ? K+ X ? ?+ e+ ?e Motivation – reduced ? systematics E.g. Atmospheric neutrinos: 30% uncertainty in fluxes 7% uncertainty in ratio ?? / ?e ? Dedicated neutrino beams, from monoenergetic muons. Targetry for Neutrino Factory Proposal to build a muon storage ring for a ?-factory. (also first stage of a high energy ??-collider) High ?-fluxes are required for precision measurements ~1012 m–2yr–1 for 732 km baseline or ~1010 m–2yr–1 for 7332 km Requires ~1021 muons per year Requires ~1021 pions per year This assumes capturing ~0.6 pions/incident proton Need high Z target ?+/?– ratio should be ~1 requires low A Several proton driver designs CERN: Linac+accumulator p=2 GeV/c FNAL: Synchrotron p=16 GeV/c CERN-BNL:Synchrotron p=24 GeV/c Targets and pion capture Low Energy pion production Surely it has all been done before ! Data required for a ?-Factory HARP experiment PS214 Università degli Studi e Sezione INFN, Bari, Italy Institut für Physik, Universit?t Dortmund, Germany Joint Institute for Nuclear Research, JINR Dubna, Russia Università degli Studi e Sezione INFN, Ferrara, Italy CERN, Geneva, Switzerland Section de Physique, Université de Genève, Switzerland Laboratori Nazionali di Legnaro dell INFN, Legnaro, Italy Institut de Physique Nucléaire, UCL, Louvain-la-Neuve, Belgium Università degli Studi e Sezione INFN, Milano, Italy Institute for Nuclear Research, Moscow, Russia Università Federico II e Sezione INFN, Napoli, Italy Nuclear and Astrophysics Laboratory, University of Oxford, UK Università degli Studi e Sezione INFN, Padova, Italy LPNHE, Université de Paris VI et VII, Paris, France Institute for