1 / 29

HARP and K2K

HARP and K2K. 1. The K2K experiments 2. beam related uncertainties 3. HARP and results 4. K2K and results 5. conclusions. K2K & T2K. Phase II: 4 MW upgrade. Phase II HK: 1000 kt. JPARC-  ~0.6GeV n beam 0.75 MW 50 GeV PS (2009  ). SK: 22.5 kt. Kamioka. J-PARC.

rocco
Télécharger la présentation

HARP and K2K

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HARP and K2K 1. The K2K experiments 2. beam related uncertainties 3. HARP and results 4. K2K and results 5. conclusions

  2. K2K & T2K Phase II: 4 MW upgrade Phase II HK: 1000 kt JPARC- ~0.6GeV n beam 0.75 MW 50 GeV PS (2009 ) SK: 22.5 kt Kamioka J-PARC K2K~1.2 GeV n beam 0.01 MW 12 GeV PS (1999 2005)

  3. K2K ran 1999-2001 2003-2004 12 GeV protons WBB flux X cross-sections poorly known from first principles measured in near detectors: Most useful turned out to be -- scibar (water + scint) -- MRD

  4. far/near ratio Far flux different from near flux (solid angle) neutrino cross-sections poorly known at low energies near detector is also a cross-section measurement device, PROVIDED FLUX IS KNOWN ==> hadron production measurements

  5. Hadron production on nuclear targets is a) complicated b) uninteresting for hadronic physics c) difficult to measure well d) absolutely mandatory for neutrino beam experiments ==> data are sparse and Monte-Carlos are very uncertain measure!

  6. HARP approved 2000 built in 17 months run sept. 2001 -> nov 2002 106 triggers at each of these settings Beam line PID Forward detectors --> neutrino beams - K2K, - Miniboone, - atmospheric, - Low energy SPL superbeam Large Angle detectors -->neutrino factory

  7. HARP Beam counters: identify and count incoming particles define beam particle impact in target + empty target runs to subtract effect of non-target material and count composition in electrons and muons

  8. HARP forward electrons hadrons hadrons p K electrons p Calorimeter E/p and E(1st layer)/E for p above pion threshold TOF for p=2+-0.25 Ncherenkov for p below pion threshold

  9. Figure 9 Muon neutrino fluxes in the K2K experiment as a function of neutrino energy En, as predicted by the default hadronic model in the K2K beam Monte Carlo simulation (dotted histograms),and by the HARP p+ production measurement (filled circles with error bars). Left: unit-area normalized flux predictions at the K2K near (top) and far (bottom) detector locations, Fnear and Ffar; right : the far–to–near flux ratio (empty squares with error boxes show the K2K model results), showing the precision improvement brought by the HARP data. Uni-Ge: A.B, Borghi, Campanelli, Cervera, Gilardoni, Graulich, Morone, Prior, Schroeter

  10. K2K final results (using HARP input, 4.1 -> 4.4 s C.L. improved by factor 3) no oscillation flux*0.6 best osc. fit arXiv:hep-ex/0606032 v2 sept 06 (Blondel, Borghi, Cervera, Schroeter) + papers on p0 production and quasi-elastics reconstructed « single ring » Quasi-elastics in SuperKamiokande ==> spectral shape + normalization show oscillation

  11. Large angle analysis Large angle analysis

  12. d0*sign 1/p

  13. cryogenic H2 target

  14. HARP large angle S. Borghi

  15. HARP prelim Optimization of proton accelerator energy for the neutrino factory proton driver HARP prelim. 0.3< q<0.9 250MeV < pp < 500 pi+ pi- 5 GeV is not a bad energy! data (2006) simulations (2005) caution! these results are not obtained exactly in the same kinematic domain

  16. nm --> ne search in K2K one candidate event found

  17. CONCLUSIONS -- Starting from HARP, we are building up an increasingly strong EU and CH contribution to the Japanese Long-baseline neutrino programme -- K2K confirmed the existence of oscillations with an accelerator neutrino beam first search for nm --> ne appearance -- Hadroproduction measurement have shown to be i) difficult and ii) important for understandng of oscillation experiments. -- The HARP data have been used successfully to improve the K2K oscillation result will be crucial for the upcoming miniBoone result will allow a firm conclusion on the choice of the energy for the CERN high power proton accelerator

More Related