Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector

Abe, K.; Abgrall, N.; Ajima, Y.; Aihara, H.; Albert, J.; Andreopoulos, C.; Andrieu, Bernard; Anerella, M.; Aoki, Shigeki; Araoka, O.; Argyriades, J.; Ariga, A.; Ariga, T.; Assylbekov, S.; Autiero, D.; Badertscher, A.; Barbi, M.; Barker, G. J.; Barr, G.; Bass, M.; Batkiewicz, M.; Bay, F.; Bentham, S. W.; Berardi, V.; Berger, B. E.; Bertram, I.; Besnier, M.; Beucher, J.; Beznosko, D.; Bhadra, S.; Blaszczyk, F. d. M.; Błocki, J.; Blondel, A.; Bojechko, C.; Bouchez, J.; Boyd, S. B.; Bravar, A.; Bronner, C.; Brook-Roberge, D. G.; Buchanan, N. J.; Budd, H. S.; Calvet, D.; Cartwright, S. L.; Carver, A.; Castillo, R.; Catanesi, M. G.; Cazes, A.; Cervera, A.; Chavez, C. A.; Choi, Seonho; Christodoulou, G.; Coleman, J. P.; Collazuol, G.; Coleman, William F.; Connolly, K.; Curioni, A.; Dąbrowska, A.; Dankó, I.; Das, Rajarshi; Davies, Gavin; Davis, Stephen C.; Day, M.; Rosa, G. De; André, J. P. A. M. de; Perio, P. de; Dealtry, T.; Delbart, A.; Densham, C.; Lodovico, F. Di; Luise, S. Di; Tran, P.; Dobson, J.; Dore, U.; Drapier, O.; Dufour, Frédéric; Dumarchez, J.; Dytman, S.; Dziewiecki, M.; Dziomba, M.; Emery, S.; Ereditato, A.; Escallier, J.; Escudero, L.; Esposito, L. S.; Fechner, M.; Ferrero, A.; Finch, A. J.; Frank, Edward D.; Fujii, Y.; Fukuda, Y.; Galymov, V.; Ganetis, G.; Gannaway, F.; Gaudin, A.; Gendotti, A.; George, M.; Giffin, S.; Giganti, C.; Gilje, K.; Ghosh, A.; Golan, T.; Goldhaber, M.; Gómez-Cadenas, J. J.; Gomi, S.; Gonin, M.; Grant, N.; Grant, A.; Gumplinger, P.; Guzowski, P.; Haesler, A.; Haigh, M. D.; Hamano, K.; Hansen, C. J.; Hansen, D.; Hara, T.; Harrison, P. F.; Hartfiel, B. L.; Hartz, M.; Haruyama, T.; Hasegawa, T.; Hastings, N. C.; Hatzikoutelis, A.; Hayashi, Kenji; Hayato, Y.; Hearty, C.; Helmer, R. L.; Henderson, R.; Higashi, Nao; Hignight, J.; Hillairet, A.; Hirose, E.; Holeczek, J.; Horikawa, S.; Hyndman, A.; Ichikawa, A. K.; Ieki, K.; Ieva, M.; Iida, M.; Ikeda, M.; Ilić, J.; Imber, J.; Ishida, Toru; Ishihara, C.; Ishii, T.; Ives, S. J.; Iwasaki, M.; Iyogi, K.; Izmaylov, A.; Jamieson, B.; Johnson, R. A.; Joo, K. K.; Jover-Manas, G.; Jung, C. K.; Kaji, Hiroshi; Kajita, T.; Kakuno, H.; Kameda, J.; Kaneyuki, K.; Karlen, D.; Kasami, K.; Kato, I.; Kawamuko, Hiroyuki; Kearns, E.; Khabibullin, M.; Khanam, F.; Khotjantsev, A.; Kiełczewska, D.; Kikawa, T.; Kim, J.; Kim, J. Y.; Kim, S. B.; Kimura, N.; Kirby, B.; Kisiel, J.; Kitching, P.; Kobayashi, T.; Kogan, G.; Koike, S.; Konaka, A.; Kormos, L. L.; Korzenev, A.; Koseki, K.; Koshio, Y.; Kouzuma, Y.; Kowalik, K.; Kravtsov, V. I.; Kreslo, I.; Kropp, W. R.; Kubo, H.; Kubota, Jun; Kudenko, Y.; Kulkarni, N. P.; Kurimoto, Yoshinori; Kurjata, R.; Kutter, T.; Łagoda, J.; Laihem, K.; Laveder, M.; Lee, K. P.; Le, P. T.; Lévy, J. M.; Licciardi, C.; Lim, I. T.; Lindner, T.; Litchfield, R. P.; Litos, M.; Longhin, A.; Lopez, G.; Loverre, P.; Ludovici, L.; Lux, T.; Macaire, M.; Mahn, Kendall; Makida, Y.; Malek, M.; Manly, S.; Marchionni, A.; Marino, A. 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J.; Wongjirad, T.; Yamada, Shoichi; Yamada, Y.; Yamamoto, A.; Yamamoto, K.; Yamanoi, Y.; Yokota, Hiroshi; Yamauchi, Takeshi; Yanagisawa, C.; Yano, T.; Yen, S.; Yershov, N.; Yokoyama, M.; Yuan, Tianlu; Zalewska, A.; Zalipska, J.; Zambelli, L.; Заремба, К.; Ziembicki, M.; Zimmerman, E. D.; Zito, M.; Żmuda, J.

doi:10.1016/j.nima.2012.03.023

Cited by 113 publications

(78 citation statements)

References 17 publications

(10 reference statements)

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“…This analysis [83] significantly improves upon the original method established in 2010 [82]. The new track reconstruction algorithm has a higher track reconstruction efficiency and is less susceptible to MPPC dark noise.…”

Section: Event Selectionmentioning

confidence: 74%

“…It corresponds to about a quarter of the 3.73% error from the previous analysis method [82]. The reduction of the systematic error results from the analysis being less sensitive to MPPC dark noise and event pileup, the improved track reconstruction efficiency, and more realistic evaluations of systematic errors which had been conservatively estimated in the previous analysis.…”

Section: Systematic Errormentioning

confidence: 86%

“…Corrections for individual iron target masses and the background are applied in the same way as the previous INGRID analysis [82]. In addition, we apply corrections for dead channels and event pileup which can cause events to be lost.…”

Section: Correctionsmentioning

confidence: 99%

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Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

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376

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We report on measurements of neutrino oscillation using data from the T2K long-baseline neutrino experiment collected between 2010 and 2013. In an analysis of muon neutrino disappearance alone, we find the following estimates and 68% confidence intervals for the two possible mass hierarchies: normal hierarchy∶ sin 2 θ 23 ¼ 0.514 þ0.055 −0.056 and Δm 2 32 ¼ ð2.51 AE 0.10Þ × 10 −3 eV 2 =c 4 and inverted hierarchy∶ sin 2 θ 23 ¼ 0.511 AE 0.055 and Δm 2 13 ¼ ð2.48 AE 0.10Þ × 10 −3 eV 2 =c 4 . The analysis accounts for multinucleon mechanisms in neutrino interactions which were found to introduce negligible bias. We describe our first analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance to estimate four oscillation parameters, jΔm 2 j, sin 2 θ 23 , sin 2 θ 13 , δ CP , and the mass hierarchy. Frequentist and Bayesian intervals are presented for combinations of these parameters, with and without including recent reactor measurements. At 90% confidence level and including reactor measurements, we exclude the region δ CP ¼ ½0.15; 0.83 π for normal hierarchy and δ CP ¼ ½−0.08; 1.09 π for inverted hierarchy. The T2K and reactor data weakly favor the normal hierarchy with a Bayes factor of 2.2. The most probable values and 68% one-dimensional credible intervals for the other oscillation parameters, when reactor data are included, are sin 2 θ 23 ¼ 0.528 þ0.055 −0.038 and jΔm 2 32 j ¼ ð2.51 AE 0.11Þ × 10 −3 eV 2 =c 4 .

show abstract

Section: Event Selectionmentioning

confidence: 74%

Section: Systematic Errormentioning

confidence: 86%

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Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

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279

376

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“…The near detector complex [14] contains an on-axis Interactive Neutrino Grid detector (INGRID) [16] and an off-axis magnetized detector, ND280. INGRID provides high-statistics monitoring of the beam intensity, direction, profile, and stability.…”

mentioning

confidence: 99%

Precise Measurement of the Neutrino Mixing Parameterθ23from Muon Neutrino Disappearance in an Off-Axis Beam

Abe¹,

Adam²,

Aihara³

et al. 2014

Phys. Rev. Lett.

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New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 10 20 protons on target, T2K has fit the energydependent νµ oscillation probability to determine oscillation parameters. The 68% confidence limit 3 on sin 2 (θ23) is 0.514−0.056 (0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The bestfit mass-squared splitting for normal hierarchy is ∆m 2 32 = (2.51 ± 0.10) ×10 −3 eV 2 /c 4 (inverted hierarchy: ∆m 2 13 = (2.48 ± 0.10) ×10 −3 eV 2 /c 4 ). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.

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“…It is based on FLUKA (primary proton-target interactions) and the GEANT3 (propagation, reinteractions) Monte Carlo and incorporates data from the NA61/SHINE experiment [2][3][4], which has provided measurements of the hadron production cross sections using a thin carbon and a T2K replica target [5]. Beam monitor data (direction, profile and stability) as measured by the on-axis near detector INGRID [6], are also used as inputs to estimate the flux and its systematic uncertainty, currently at the O(10%) level [7]. The predicted fluxes in both ν andν modes at SK are shown in Fig.…”

Section: The Neutrino Beammentioning

confidence: 99%

New results from T2K

Longhin

2017

EPJ Web Conf.

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Abstract. The T2K experiment is a 295-km long-baseline neutrino experiment in Japan employing an off-axis muon neutrino beam with a ∼ 0.6 GeV peak energy. The beam, produced from 30-GeV protons at the J-PARC complex on the Pacific coast, is directed to the Super-Kamiokande detector. T2K released the first long-baseline measurement of a nonzero value for the θ 13 mixing parameter through the observation of electron neutrino appearance (ν µ → ν e ) and produced the most precise measurement of θ 23 through the observation of muon neutrino disappearance (ν µ → ν µ ). T2K data, in combination with reactor experiments, also excludes at 90% C.L. a significant region of the Dirac CP phase: δ CP < −3.02(−1.87) and δ CP > −0.49(−0.98) for the normal (inverted) hierarchy. A full joint appearance and disappearance fit including both neutrino (7×10 20 protons on target, PoT) and anti-neutrino (4 × 10 20 PoT) data and, for the first time, a constraint from water target data in the near detector, is presented yielding improved sensitivity on δ CP and improved precision on sin 2 2θ 23 and the atmospheric mass splitting. The T2K experimentT2K is a long-baseline neutrino oscillation experiment located in Japan, exploiting 30 GeV protons from the Japan Proton Accelerator Research Center (J-PARC, in Tōkai, Ibaraki Prefecture) to create a muon neutrino beam. The proton beam is directed onto a graphite target and the resulting pions and kaons focussed by a system of three magnetic horns into a 96 m-long decay tunnel filled with helium gas. Depending on the direction of the 250 kA pulsed current, horns can select either positively charged particles, for a beam composed mainly of ν µ (ν-mode), or negatively charged particles, for a beam composed mainly ofν µ (ν-mode).The neutrino beam is measured by two near detectors (INGRID, ND280) located 280 m from the target and a far detector, Super-Kamiokande (SK). The far detector and one of the near detectors (ND280) are placed 2.5 • off-axis with respect to the protons' direction, which results in a narrow neutrino energy spectrum with a peak at about 0.6 GeV. The baseline between neutrino production and the far detector, 295 km, is chosen to correspond to the first minimum in the ν µ survival probability at the peak energy.T2K can measure neutrino oscillation in two channels: ν µ disappearance (ν µ → ν µ ), which is dominated by the oscillation parameters sin 2 2θ 23 and ∆m 2 32 and ν e appearance (ν µ → ν e ), which is sensitive to sin 2 2θ 13 , the octant of θ 23 and through subleading terms to δ CP and the mass hierarchy 1 a e-mail: longhin@pd.infn.it 1 "Normal" mass hierarchy (NH) indicates the ∆m 2 32 , ∆m 2 31 > 0 case (state m 3 having the largest mass) while the other case is denoted as "inverted" mass hierarchy (IH).

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Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector

Cited by 113 publications

References 17 publications

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Precise Measurement of the Neutrino Mixing Parameterθ23from Muon Neutrino Disappearance in an Off-Axis Beam

New results from T2K

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