Y. Kurimoto, J. L. Alcaraz-Aunion, S. J. Brice, L. Bugel, J. Catala-Perez, G. Cheng, J. M. Conrad, Z. Djurcic, U. Dore, D. A. Finley, A. J. Franke, C. Giganti, ∗ J. J. Gomez-Cadenas, P. Guzowski, A. Hanson, Y. Hayato, K. Hiraide, † G. Jover-Manas, G. Karagiorgi, T. Katori, Y. K. Kobayashi, T. Kobilarcik, H. Kubo, W. C. Louis, P. F. Loverre, L. Ludovici, K. B. M. Mahn, ‡ C. Mariani, S. Masuike, K. Matsuoka, V. T. McGary, W. Metcalf, G. B. Mills, G. Mitsuka, § Y. Miyachi, ¶ S. Mizugashira, C. D. Moore, Y. Nakajima, T. Nakaya, R. Napora, P. Nienaber, D. Orme, M. Otani, A. D. Russell, F. Sanchez, M. H. Shaevitz, T.-A. Shibata, M. Sorel, R. J. Stefanski, H. Takei, ∗∗ H.-K. Tanaka, M. Tanaka, R. Tayloe, I. J. Taylor, †† R. J. Tesarek, Y. Uchida, R. Van de Water, J. J. Walding, M. O. Wascko, H. B. White, M. J. Wilking, ‡ M. Yokoyama, G. P. Zeller, and E. D. Zimmerman

The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of (nu) over bar (mu) at Fermilab's Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their data sets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the nu(mu) background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on (nu) over bar (mu) disappearance that dramatically improves upon prior limits in the Delta m(2) = 0.1-100 eV(2) region.

The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ at Fermilab's Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their data sets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ disappearance that dramatically improves upon prior limits in the $\ensuremath{\Delta}{m}^{2}=0.1--100\text{ }\text{ }{\mathrm{eV}}^{2}$ region.

The SciBooNE and MiniBooNE collaborations report the results of a νμ disappearance search in the Δ'm2 region of 0.5-40 eV2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on νμ disappearance in the 0.5-40 eV2 Δm2 region, with an improvement over previous experimental constraints between 10 and 30 eV2

The SciBooNE and MiniBooNE collaborations report the results of a ν_μdisappearance search in the Δm^2 region of 0.5-40 eV^2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on ν_μdisappearance in the 0.5-40 eV^2 Δm^2 region, with an improvement over previous experimental constraints between 10 and 30 eV^2.

The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of (cid:1) (cid:1) (cid:2) at Fermilab’s Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their data sets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the (cid:1) (cid:2) background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on (cid:1) (cid:1) (cid:2) disappearance that dramatically improves upon prior limits in the (cid:2) m 2 ¼ 0 : 1 – 100 eV 2 region.

G. Cheng, a W. Huelsnitz, b A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, S. J. Brice, B. C. Brown, 2 L. Bugel, J. Catala-Perez, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, U. Dore, 3 D. A. Finley, R. Ford, A. J. Franke, F. G. Garcia, G. T. Garvey, C. Giganti, c J. J. Gomez-Cadenas, 4 J. Grange, P. Guzowski, d A. Hanson, Y. Hayato, K. Hiraide, e C. Ignarra, R. Imlay, R. A. 5 Johnson, B. J. P. Jones, G. Jover-Manas, G. Karagiorgi, 17 T. Katori, 17 Y. K. Kobayashi, 6 T. Kobilarcik, H. Kubo, Y. Kurimoto, f W. C. Louis, P. F. Loverre, L. Ludovici, K. B. M. Mahn, g 7 C. Mariani, h W. Marsh, S. Masuike, K. Matsuoka, V. T. McGary, W. Metcalf, G. B. Mills, 8 J. Mirabal, G. Mitsuka, i Y. Miyachi, j S. Mizugashira, C. D. Moore, J. Mousseau, Y. Nakajima, k 9 T. Nakaya, R. Napora, l P. Nienaber, D. Orme, B. Osmanov, M. Otani, Z. Pavlovic, D. Perevalov, 10 C. C. Polly, H. Ray, B. P. Roe, A. D. Russell, F. Sanchez, M. H. Shaevitz, T.-A. Shibata, 11 M. Sorel, J. Spitz, I. Stancu, R. J. Stefanski, H. Takei, m H.-K. Tanaka, M. Tanaka, R. Tayloe, 12 I. J. Taylor, n R. J. Tesarek, Y. Uchida, R. G. Van de Water, J. J. Walding, o M. O. Wascko, 13 D. H. White, H. B. White, D. A. Wickremasinghe, M. Yokoyama, p G. P. Zeller, and E. D. Zimmerman 14

The SciBooNE Collaboration reports K+ production cross section and rate measurements using high energy daughter muon neutrino scattering data off the SciBar polystyrene (C8H8) target in the SciBooNE detector. The K+ mesons are produced by 8 GeV protons striking a beryllium target in Fermilab Booster Neutrino Beam line (BNB). Using observed neutrino and antineutrino events in SciBooNE, we measure d2{\sigma}/dpd{\Omega} = (5.34 \times 0.76) mb/(GeV/c \times sr) for p + Be -> K+ + X at mean K+ energy of 3.9 GeV and angle (with respect to the proton beam direction) of 3.7 degrees, corresponding to the selected K+ sample. Compared to Monte Carlo predictions using previous higher energy K+ production measurements, this measurement, which uses the NUANCE neutrino interaction generator, is consistent with a normalization factor of 0.85\times0.12. This agreement is evidence that the extrapolation of the higher energy K+ measurements to an 8 GeV beam energy using Feynman scaling is valid. This measurement reduces the error on the K+ production cross section from 40% to 14%.

The SciBooNE Collaboration reports a measurement of inclusive charged current interactions of muon neutrinos on carbon with an average energy of 0.8 GeV using the Fermilab Booster Neutrino Beam. We compare our measurement with two neutrino interaction simulations: NEUT and NUANCE. The charged current interaction rates (product of flux and cross section) are extracted by fitting the muon kinematics, with a precision of 6-15% for the energy dependent and 3% for the energy integrated analyses. We also extract CC inclusive interaction cross sections from the observed rates, with a precision of 10-30% for the energy dependent and 8% for the energy integrated analyses. This is the first measurement of the CC inclusive cross section on carbon around 1 GeV. These results can be used to convert previous SciBooNE cross section ratio measurements to absolute cross section values.

We report the and construction status of the INGRID neutr ino beam monitor for the T2K experiment. The INGRID detector consists of sixteen modules of iron-scintillator sandwich and will be placed around the neutrino beam center at 280m downstream of the target. By counting the number of neutrino interaction inside each module, we reconstruct and directly monitor the neutr ino beam direction and profile. We have tested the active components of INGRID and have found the light yield satisfies our requirements. Currently the assembly of INGRID is underway and the detector will be installed in March, 2009.

The SciBooNE Collaboration reports a measurement of neutral current coherent neutral pion production on carbon by a muon neutrino beam with average energy 0.8 GeV. The separation of coherent from inclusive neutral pion production has been improved by detecting recoil protons from resonant neutral pion production. We measure the ratio of the neutral current coherent neutral pion production to total charged current cross sections to be (1.16 +/- 0.24) x 10-2. The ratio of charged current coherent pion to neutral current coherent pion production is calculated to be 0.14+0.30 -0.28, using our published charged current coherent pion measurement.

We have developed a Multi-Pixel Photon Counter (MPPC) for the neutrino detectors of T2K experiment. About 64,000 MPPCs have been produced and tested in about a year. In order to characterize a large number of MPPCs, we have developed a system that simultaneously measures 64 MPPCs with various bias voltage and temperature. The performance of MPPCs are found to satisfy the requirement of T2K experiment. In this paper, we present the performance of 17,686 MPPCs measured at Kyoto University.

The SciBooNE Collaboration reports inclusive neutral current neutral pion production by a muon neutrino beam on a polystyrene target (C8H8). We obtain (7.7 \pm 0.5(stat.) \pm 0.5 (sys.)) x 10^(-2) as the ratio of the neutral current neutral pion production to total charged current cross section; the mean energy of neutrinos producing detected neutral pions is 1.1 GeV. The result agrees with the Rein-Sehgal model implemented in our neutrino interaction simulation program with nuclear effects. The spectrum shape of the neutral pion momentum and angle agree with the model. We also measure the ratio of the neutral current coherent pion production to total charged current cross section to be (0.7 \pm 0.4) x 10^(-2).

In the T2K near neutrino detectors, about 60 000 Hamamatsu Multi-Pixel Photon Counters (MPPCs) will be used. The mass production of MPPC has started in February 2008.In order to perform quality assurance and to characterize each device, we have developed an MPPC test system. For each MPPC, gain, breakdown voltage, noise rate, photo detection efficiency, and cross-talk and after-pulse rate are measured as functions of the bias voltage and temperature. The design of the test system and the measurement procedure are described.

We have developed a multi-pixel photon counter (MPPC) with Hamamatsu Photonics for use in the Tokai–Kamioka (T2K) long baseline neutrino experiment. A total of 60,000 MPPCs will be used in the T2K near detector, the first time that MPPCs have been used on such a large scale. We have created a test bench to measure the gain, noise rate, crosstalk and afterpulse rate, and photon detection efficiency of 17,686 of these MPPCs. The results of these measurements are presented in this paper.

A special type of Hamamatsu Multi-Pixel Photon Counter (MPPC), with a sensitive area of 1.3×1.3mm2 containing 667 pixels of size 50×50μm2 each, has been developed for the near neutrino detector in the T2K long baseline neutrino experiment. About 60000 MPPCs will be used in total to read out the plastic scintillator detectors with wavelength shifting fibers. We report on the basic performance of MPPCs produced for T2K.

The SciBooNE Collaboration has performed a search for charged current coherent pion production from muon neutrinos scattering on carbon, nu C-12(mu) -> mu C-12 pi+(,) with two distinct data samples. No evidence for coherent pion production is observed. We set 90% confidence level upper limits on the cross section ratio of charged current coherent pion production to the total charged current cross section at 0.67 X 10(-2) at mean neutrino energy 1.1 GeV and 1.36 X 10(-2) at mean neutrino energy 2.2 GeV.