Message-ID: <4164A55C.4080506@neutrino.kek.jp> Date: Thu, 07 Oct 2004 11:09:32 +0900 From: koichiro Nishikawa <nishikaw@neutrino.kek.jp> Subject: [Fwd: September 2004 long-baseline neutrino newsletter] -------- Original Message -------- Subject: September 2004 long-baseline neutrino newsletter Date: Wed, 06 Oct 2004 18:55:56 -0500 From: Maury Goodman at Argonne <mcg@hep.anl.gov> To: LONGBNEWS@FNAL.GOV CC: MCG@hep.anl.gov Long-Baseline Neutrino News September 2004 *** NOW 2004 The neutrino world at the 2004 Neutrino Oscillation Workshop was divided into Terra Cognita, Terra Incognita and Atlas Coelestis. See http://www.ba.infn.it/~now2004/Program/plan/plan.htm for a marvelous map of Planisphaerium Neutrinorum. Trans are at http://www.ba.infn.it/~now2004/Program/New%20Scientific%20Program.html *** Terra Cognita I Solar Neutrinos, Problems with the sun? New measurements of the solar composition on the surface of the lighter metals (C, N, O, Ne and Ar) are 30% lower than previously widely used solar abundances. This affects the comparisons with helioseismology (a lot!), so that previous good agreement is no longer there. But it does NOT significantly affect the predicted solar neutrino fluxes. Something new is needed in the models, maybe magnetic fields. See astro-ph/0407060 & http://www.ba.infn.it/~now2004/talks/12_09_04/plen/NowTurck2004.pdf *** Terra Cognita I, KamLAND Delta m squared KamLAND has reported a new background not previously considered, from 13-C(alpha,n)16-O(*) with the O giving a gamma of ~6 MeV. If you subtract about 10 more events from the signal(258), the best fit for mixing angle does not change, but best fit Delta m-squared goes down from 8.2 10^-5 eV^2 to 7.8 10^-5 eV^2. *** Terra Cognita II, theta_23. Super-K sees more of the same. With running that solely consists of data after the rebuild, Super-Kamiokande has repeated the zenith angle flavor ratio analysis for Sub-GeV and Multi-Gev samples, partially contained events, upward muon angular distribution, upward stopping muon angular distribution with 243/311 days of livetime (depending on the analysis). Preliminary best fit of just the new data is 2.1 10^-3 eV^2. Super-K I is 1489/1646 days. *** Terra Cognita II, delta m-squared 32 from K2K K2K now has 8.9 10^19 protons on target for analysis. They have 108 fully contained events, with 150.9 +11.6-10.0 from a no-oscillation Monte Carlo. Best fit is maximal mixing with delta m squared 2.7 10^-3, or 1.7-3.5 at 90%CL. *** Terra Cognita II, OPERA OPERA is a long-baseline neutrino emulsion experiment in the Gran Sasso and the Cern NGS beam. Emulsion production started August 2003 and is 20% complete. Magnet SM1 was completed June 2004 and SM2 is partially assembled. Brick assembly is taking place in Hall's A&B. The first supermodule will be done in May 2006 and the 2nd SM will be underway when the beam arrives. CNGS contrasts with NuMI as an appearance versus disappearance experiment. Also, "we hope the difficulties will disappear and the beam will appear." *** Terra Incognita, theta-13 global fits The 2004 KamLAND results have caused the limit on theta-13 due to global fits to a ~ 25% smaller value than before. See Figure 15 of Maltoni et al, hep-ph/0405172. The new KamLAND background will cause it to go up again. *** Terra Incognita, T2K for theta-13 Construction of the T2K beam has started, and the beam is expected to be complete in early 2009. The decay pipe is being built for a beam power of 4 Megawatts. *** Terra Incognita, another prediction for theta-13, delta If the neutrino mass matrix is bimaximal, the lepton mass matrix will contribute to Ue3 ~ sqrt(m_{e}/2m_{mu}) = 0.052. See Ferrandis & Pakvasa, hep-ph/0409204. There is even a (less heartfelt) prediction for delta ~ 45 degrees. theta_23 differs from pi/4 by 1.7 degrees. *** Terra Incognita, FLARE FLARE (Fermilab Liquid ARgon Experiments) submitted a letter of intent, available at hep-ex/0408121 led by A. Para. Forty ton and fifty kiloton liquid argon detectors at Fermilab are considered. *** Atlas Coelestis, crabby physicists at the South Pole. AMANDA has 3369 atmospheric neutrinos (or 5000 depending on cut level). In an all-sky survey, the hottest point in the sky matches the Crab Nebula, with a 3.4 sigma effect. In their background from scrambled data, the hottest source is 3.5 sigma. *** Terra indeepus, DUSEL solicitation proposal submitted http://cosmology.berkeley.edu/inpac/DUSEL/DUSELProposal.pdf The site group currently covers 8 sites: Cascades, Henderson, Homestake, Kimballton, San Jacinto, Soudan, Sudbury, WIPP. *** Notable New References (- web page at bottom for links) <-> Ambrosio et al., "Measurements of atmospheric muon neutrino oscillations, analysis of ...MACRO" Eur. Phys. J. C36 323-339 2004 <-> K2K, "Measurement of one-pi0 production in NC nu interactions with H2O by a 1.3 GeV wide band muon neutrino beam" hep-ex/0408134 <-> Gandhi et al., "Large Matter Effects in numu-nutau oscillations", hep-ph/0408361 <-> Sugiyama et al, "Systematic limits on theta13 in nu oscillation experiments with multi-reactors, hep-ph/0409109 <-> McConnel & Shaevitz, "Comparisons and Combinations of reactor and long-baseline nu measurements" hep-ex/0409028 <-> Petcov & Rodejohann, "Flavor Symmetry L_e-L_mu-L_tau, Atmospheric Neutrino Mixing and CP violation" hep-ph/0409135 <-> Fiorentini, "Geo-Neutrinos, a short review", hep-ph/0409152 <-> Liu et al, "Does Daya-Bay Reactor Play an Important Role in MNS matrix?" hep-ph/0409155 <-> NOMAD, "A Study of Strange Particles Produced in Neutrino NC Interactions in the NOMAD Experiment", hep-ex/0409037 <-> Goswami et al., "Global Analysis of Neutrino Oscillation" hep-ph/0409224 <-> Giunti, "Theory of Neutrino Oscillations", hep-ph0409230. The answer to many Neutrino Oscillation (NO) questions is no. <-> Laserre, "Double CHOOZ: a search for Theta13" hep-ex/0409060 ****************************************************************** http://www.hep.anl.gov/ndk/longbnews/ maury.goodman@anl.gov
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