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12 results on '"M, Litos"'

1. Search for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ in Super-Kamiokande

Author

K, Abe, Y, Hayato, T, Iida, K, Iyogi, J, Kameda, Y, Koshio, Y, Kozuma, Ll, Marti, M, Miura, S, Moriyama, M, Nakahata, S, Nakayama, Y, Obayashi, H, Sekiya, M, Shiozawa, Y, Suzuki, A, Takeda, Y, Takenaga, K, Ueno, K, Ueshima, S, Yamada, T, Yokozawa, C, Ishihara, H, Kaji, T, Kajita, K, Kaneyuki, K P, Lee, T, McLachlan, K, Okumura, Y, Shimizu, N, Tanimoto, L, Labarga, E, Kearns, M, Litos, J L, Raaf, J L, Stone, L R, Sulak, M, Goldhaber, K, Bays, W R, Kropp, S, Mine, C, Regis, A, Renshaw, M B, Smy, H W, Sobel, K S, Ganezer, J, Hill, W E, Keig, J S, Jang, J Y, Kim, I T, Lim, J B, Albert, K, Scholberg, C W, Walter, R, Wendell, T M, Wongjirad, T, Ishizuka, S, Tasaka, J G, Learned, S, Matsuno, S N, Smith, T, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, K, Nakamura, K, Nishikawa, Y, Oyama, K, Sakashita, T, Sekiguchi, T, Tsukamoto, A T, Suzuki, Y, Takeuchi, M, Ikeda, A, Minamino, T, Nakaya, Y, Fukuda, Y, Itow, G, Mitsuka, T, Tanaka, C K, Jung, G D, Lopez, I, Taylor, C, Yanagisawa, H, Ishino, A, Kibayashi, S, Mino, T, Mori, M, Sakuda, H, Toyota, Y, Kuno, M, Yoshida, S B, Kim, B S, Yang, H, Okazawa, Y, Choi, K, Nishijima, M, Koshiba, M, Yokoyama, Y, Totsuka, K, Martens, J, Schuemann, M R, Vagins, S, Chen, Y, Heng, Z, Yang, H, Zhang, D, Kielczewska, P, Mijakowski, K, Connolly, M, Dziomba, E, Thrane, and R J, Wilkes

Abstract

We present the results of searches for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ using data from a combined 172.8 kt·yr exposure of Super-Kamiokande-I,-II, and-III. We set lower limits on the partial lifetime for each of these modes: τn→ν[over ¯]π01.1×10(33) years and τp→ν[over ¯]π+3.9×10(32) years at a 90% confidence level.

Published
2013

2. Search for proton decay via p--e+pi0 and p--micro+pi0 in a large water Cherenkov detector

Author

H, Nishino, S, Clark, K, Abe, Y, Hayato, T, Iida, M, Ikeda, J, Kameda, K, Kobayashi, Y, Koshio, M, Miura, S, Moriyama, M, Nakahata, S, Nakayama, Y, Obayashi, H, Ogawa, H, Sekiya, M, Shiozawa, Y, Suzuki, A, Takeda, Y, Takenaga, Y, Takeuchi, K, Ueno, K, Ueshima, H, Watanabe, S, Yamada, S, Hazama, I, Higuchi, C, Ishihara, T, Kajita, K, Kaneyuki, G, Mitsuka, K, Okumura, N, Tanimoto, M R, Vagins, F, Dufour, E, Kearns, M, Litos, J L, Raaf, J L, Stone, L R, Sulak, W, Wang, M, Goldhaber, S, Dazeley, R, Svoboda, K, Bays, D, Casper, J P, Cravens, W R, Kropp, S, Mine, C, Regis, M B, Smy, H W, Sobel, K S, Ganezer, J, Hill, W E, Keig, J S, Jang, J Y, Kim, I T, Lim, M, Fechner, K, Scholberg, C W, Walter, R, Wendell, S, Tasaka, J G, Learned, S, Matsuno, Y, Watanabe, T, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, K, Nakamura, K, Nishikawa, Y, Oyama, K, Sakashita, T, Sekiguchi, T, Tsukamoto, A T, Suzuki, A, Minamino, T, Nakaya, M, Yokoyama, Y, Fukuda, Y, Itow, T, Tanaka, C K, Jung, G, Lopez, C, McGrew, R, Terri, C, Yanagisawa, N, Tamura, Y, Idehara, M, Sakuda, Y, Kuno, M, Yoshida, S B, Kim, B S, Yang, T, Ishizuka, H, Okazawa, Y, Choi, H K, Seo, Y, Furuse, K, Nishijima, Y, Yokosawa, M, Koshiba, Y, Totsuka, S, Chen, Y, Heng, Z, Yang, H, Zhang, D, Kielczewska, E, Thrane, and R J, Wilkes

Abstract

We have searched for proton decays via p--e;{+}pi;{0} and p--micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p--e;{+}pi;{0} and p--micro;{+}pi;{0} modes, respectively.

Published
2009

3. Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions.

Author

Sampath A, Davoine X, Corde S, Gremillet L, Gilljohann M, Sangal M, Keitel CH, Ariniello R, Cary J, Ekerfelt H, Emma C, Fiuza F, Fujii H, Hogan M, Joshi C, Knetsch A, Kononenko O, Lee V, Litos M, Marsh K, Nie Z, O'Shea B, Peterson JR, Claveria PSM, Storey D, Wu Y, Xu X, Zhang C, and Tamburini M

Abstract

Sources of high-energy photons have important applications in almost all areas of research. However, the photon flux and intensity of existing sources is strongly limited for photon energies above a few hundred keV. Here we show that a high-current ultrarelativistic electron beam interacting with multiple submicrometer-thick conducting foils can undergo strong self-focusing accompanied by efficient emission of gamma-ray synchrotron photons. Physically, self-focusing and high-energy photon emission originate from the beam interaction with the near-field transition radiation accompanying the beam-foil collision. This near field radiation is of amplitude comparable with the beam self-field, and can be strong enough that a single emitted photon can carry away a significant fraction of the emitting electron energy. After beam collision with multiple foils, femtosecond collimated electron and photon beams with number density exceeding that of a solid are obtained. The relative simplicity, unique properties, and high efficiency of this gamma-ray source open up new opportunities for both applied and fundamental research including laserless investigations of strong-field QED processes with a single electron beam.

Published
2021
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4. Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator.

Author

Lindstrøm CA, Adli E, Allen JM, An W, Beekman C, Clarke CI, Clayton CE, Corde S, Doche A, Frederico J, Gessner SJ, Green SZ, Hogan MJ, Joshi C, Litos M, Lu W, Marsh KA, Mori WB, O'Shea BD, Vafaei-Najafabadi N, and Yakimenko V

Abstract

Hollow channel plasma wakefield acceleration is a proposed method to provide high acceleration gradients for electrons and positrons alike: a key to future lepton colliders. However, beams which are misaligned from the channel axis induce strong transverse wakefields, deflecting beams and reducing the collider luminosity. This undesirable consequence sets a tight constraint on the alignment accuracy of the beam propagating through the channel. Direct measurements of beam misalignment-induced transverse wakefields are therefore essential for designing mitigation strategies. We present the first quantitative measurements of transverse wakefields in a hollow plasma channel, induced by an off-axis 20 GeV positron bunch, and measured with another 20 GeV lower charge trailing positron probe bunch. The measurements are largely consistent with theory.

Published
2018
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5. Search for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ in Super-Kamiokande.

Author

Abe K, Hayato Y, Iida T, Iyogi K, Kameda J, Koshio Y, Kozuma Y, Marti L, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Ueno K, Ueshima K, Yamada S, Yokozawa T, Ishihara C, Kaji H, Kajita T, Kaneyuki K, Lee KP, McLachlan T, Okumura K, Shimizu Y, Tanimoto N, Labarga L, Kearns E, Litos M, Raaf JL, Stone JL, Sulak LR, Goldhaber M, Bays K, Kropp WR, Mine S, Regis C, Renshaw A, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Albert JB, Scholberg K, Walter CW, Wendell R, Wongjirad TM, Ishizuka T, Tasaka S, Learned JG, Matsuno S, Smith SN, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Takeuchi Y, Ikeda M, Minamino A, Nakaya T, Fukuda Y, Itow Y, Mitsuka G, Tanaka T, Jung CK, Lopez GD, Taylor I, Yanagisawa C, Ishino H, Kibayashi A, Mino S, Mori T, Sakuda M, Toyota H, Kuno Y, Yoshida M, Kim SB, Yang BS, Okazawa H, Choi Y, Nishijima K, Koshiba M, Yokoyama M, Totsuka Y, Martens K, Schuemann J, Vagins MR, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Mijakowski P, Connolly K, Dziomba M, Thrane E, and Wilkes RJ

Abstract

We present the results of searches for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ using data from a combined 172.8  kt·yr exposure of Super-Kamiokande-I,-II, and-III. We set lower limits on the partial lifetime for each of these modes: τn→ν[over ¯]π0>1.1×10(33) years and τp→ν[over ¯]π+>3.9×10(32) years at a 90% confidence level.

Published
2014
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6. Search for dinucleon decay into kaons in Super-Kamiokande.

Author

Litos M, Abe K, Hayato Y, Iida T, Ikeda M, Iyogi K, Kameda J, Kobayashi K, Koshio Y, Kozuma Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Ogawa H, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Takeuchi Y, Ueno K, Ueshima K, Watanabe H, Yamada S, Yokozawa T, Hazama S, Ishihara C, Kaji H, Kajita T, Kaneyuki K, McLachlan T, Okumura K, Shimizu Y, Tanimoto N, Vagins MR, Kearns E, Stone JL, Sulak LR, Dufour F, Raaf JL, Henning B, Goldhaber M, Bays K, Casper D, Cravens JP, Kropp WR, Mine S, Regis C, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Albert JB, Wongjirad T, Wendell R, Scholberg K, Walter CW, Tasaka S, Learned JG, Matsuno S, Watanabe Y, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Nishino H, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Minamino A, Nakaya T, Fukuda Y, Itow Y, Mitsuka G, Tanaka T, Jung CK, Lopez G, McGrew C, Terri R, Yanagisawa C, Tamura N, Ishino H, Kibayashi A, Mino S, Mori T, Sakuda M, Toyota H, Kuno Y, Yoshida M, Kim SB, Yang BS, Ishizuka T, Okazawa H, Choi Y, Nishijima K, Yokosawa Y, Koshiba M, Yokoyama M, Totsuka Y, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Mijakowski P, Connolly K, Dziomba M, Thrane E, and Wilkes RJ

Abstract

A search for the dinucleon decay pp → K+ K+ has been performed using 91.6  kton·yr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter λ112''. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.28±0.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%±3.2%. A lower limit of 1.7×10(32)  years has been placed on the partial lifetime of the decay O16 → C14K+ K+ at 90% C.L. A corresponding upper limit of 7.8×10(-9) has been placed on the parameter λ112''.

Published
2014
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7. Beam loading by distributed injection of electrons in a plasma wakefield accelerator.

Author

Vafaei-Najafabadi N, Marsh KA, Clayton CE, An W, Mori WB, Joshi C, Lu W, Adli E, Corde S, Litos M, Li S, Gessner S, Frederico J, Fisher AS, Wu Z, Walz D, England RJ, Delahaye JP, Clarke CI, Hogan MJ, and Muggli P

Abstract

We show through experiments and supporting simulations that propagation of a highly relativistic and dense electron bunch through a plasma can lead to distributed injection of electrons, which depletes the accelerating field, i.e., beam loads the wake. The source of the injected electrons is ionization of the second electron of rubidium (Rb II) within the wake. This injection of excess charge is large enough to severely beam load the wake, and thereby reduce the transformer ratio T. The reduction of the average T with increasing beam loading is quantified for the first time by measuring the ratio of peak energy gain and loss of electrons while changing the beam emittance. Simulations show that beam loading by Rb II electrons contributes to the reduction of the peak accelerating field from its weakly loaded value of 43  GV/m to a strongly loaded value of 26  GV/m.

Published
2014
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8. Evidence for the appearance of atmospheric tau neutrinos in super-Kamiokande.

Author

Abe K, Hayato Y, Iida T, Iyogi K, Kameda J, Koshio Y, Kozuma Y, Marti L, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Ueno K, Ueshima K, Yamada S, Yokozawa T, Ishihara C, Kaji H, Kajita T, Kaneyuki K, Lee KP, McLachlan T, Okumura K, Shimizu Y, Tanimoto N, Labarga L, Kearns E, Litos M, Raaf JL, Stone JL, Sulak LR, Goldhaber M, Bays K, Kropp WR, Mine S, Regis C, Renshaw A, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Albert JB, Scholberg K, Walter CW, Wendell R, Wongjirad TM, Ishizuka T, Tasaka S, Learned JG, Matsuno S, Smith SN, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Takeuchi Y, Ikeda M, Minamino A, Nakaya T, Fukuda Y, Itow Y, Mitsuka G, Tanaka T, Jung CK, Lopez GD, Taylor I, Yanagisawa C, Ishino H, Kibayashi A, Mino S, Mori T, Sakuda M, Toyota H, Kuno Y, Yoshida M, Kim SB, Yang BS, Okazawa H, Choi Y, Nishijima K, Koshiba M, Yokoyama M, Totsuka Y, Martens K, Schuemann J, Vagins MR, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Mijakowski P, Connolly K, Dziomba M, Thrane E, and Wilkes RJ

Abstract

Super-Kamiokande atmospheric neutrino data were fit with an unbinned maximum likelihood method to search for the appearance of tau leptons resulting from the interactions of oscillation-generated tau neutrinos in the detector. Relative to the expectation of unity, the tau normalization is found to be 1.42 ± 0.35(stat)(-0.12)(+0.14)(syst) excluding the no-tau-appearance hypothesis, for which the normalization would be zero, at the 3.8σ level. We estimate that 180.1 ± 44.3(stat)(-15.2)(+17.8) (syst) tau leptons were produced in the 22.5 kton fiducial volume of the detector by tau neutrinos during the 2806 day running period. In future analyses, this large sample of selected tau events will allow the study of charged current tau neutrino interaction physics with oscillation produced tau neutrinos.

Published
2013
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9. Search for differences in oscillation parameters for atmospheric neutrinos and antineutrinos at Super-Kamiokande.

Author

Abe K, Hayato Y, Iida T, Ikeda M, Iyogi K, Kameda J, Koshio Y, Kozuma Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Takeuchi Y, Ueno K, Ueshima K, Watanabe H, Yamada S, Yokozawa T, Ishihara C, Kaji H, Lee KP, Kajita T, Kaneyuki K, McLachlan T, Okumura K, Shimizu Y, Tanimoto N, Martens K, Vagins MR, Labarga L, Magro LM, Dufour F, Kearns E, Litos M, Raaf JL, Stone JL, Sulak LR, Goldhaber M, Bays K, Kropp WR, Mine S, Regis C, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Albert JB, Scholberg K, Walter CW, Wendell R, Wongjirad TM, Tasaka S, Learned JG, Matsuno S, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Nishino H, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Minamino A, Nakaya T, Fukuda Y, Itow Y, Mitsuka G, Tanaka T, Jung CK, Taylor I, Yanagisawa C, Ishino H, Kibayashi A, Mino S, Mori T, Sakuda M, Toyota H, Kuno Y, Kim SB, Yang BS, Ishizuka T, Okazawa H, Choi Y, Nishijima K, Koshiba M, Yokoyama M, Totsuka Y, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Mijakowski P, Connolly K, Dziomba M, and Wilkes RJ

Abstract

We present a search for differences in the oscillations of antineutrinos and neutrinos in the Super-Kamiokande-I, -II, and -III atmospheric neutrino sample. Under a two-flavor disappearance model with separate mixing parameters between neutrinos and antineutrinos, we find no evidence for a difference in oscillation parameters. Best-fit antineutrino mixing is found to be at (Δm2,sin2 2θ)=(2.0×10(-3)  eV2, 1.0) and is consistent with the overall Super-K measurement.

Published
2011
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10. Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam.

Author

Abe K, Abgrall N, Ajima Y, Aihara H, Albert JB, Andreopoulos C, Andrieu B, Aoki S, Araoka O, Argyriades J, Ariga A, Ariga T, Assylbekov S, Autiero D, Badertscher A, Barbi M, Barker GJ, Barr G, Bass M, Bay F, Bentham S, Berardi V, Berger BE, Bertram I, Besnier M, Beucher J, Beznosko D, Bhadra S, Blaszczyk Fd, Blondel A, Bojechko C, Bouchez J, Boyd SB, Bravar A, Bronner C, Brook-Roberge DG, Buchanan N, Budd H, Calvet D, Cartwright SL, Carver A, Castillo R, Catanesi MG, Cazes A, Cervera A, Chavez C, Choi S, Christodoulou G, Coleman J, Coleman W, Collazuol G, Connolly K, Curioni A, Dabrowska A, Danko I, Das R, Davies GS, Davis S, Day M, De Rosa G, de André JP, de Perio P, Delbart A, Densham C, Di Lodovico F, Di Luise S, Dinh Tran P, Dobson J, Dore U, Drapier O, Dufour F, Dumarchez J, Dytman S, Dziewiecki M, Dziomba M, Emery S, Ereditato A, Escudero L, Esposito LS, Fechner M, Ferrero A, Finch AJ, Frank E, Fujii Y, Fukuda Y, Galymov V, Gannaway FC, Gaudin A, Gendotti A, George MA, Giffin S, Giganti C, Gilje K, Golan T, Goldhaber M, Gomez-Cadenas JJ, Gonin M, Grant N, Grant A, Gumplinger P, Guzowski P, Haesler A, Haigh MD, Hamano K, Hansen C, Hansen D, Hara T, Harrison PF, Hartfiel B, Hartz M, Haruyama T, Hasegawa T, Hastings NC, Hastings S, Hatzikoutelis A, Hayashi K, Hayato Y, Hearty C, Helmer RL, Henderson R, Higashi N, Hignight J, Hirose E, Holeczek J, Horikawa S, Hyndman A, Ichikawa AK, Ieki K, Ieva M, Iida M, Ikeda M, Ilic J, Imber J, Ishida T, Ishihara C, Ishii T, Ives SJ, Iwasaki M, Iyogi K, Izmaylov A, Jamieson B, Johnson RA, Joo KK, Jover-Manas GV, Jung CK, Kaji H, Kajita T, Kakuno H, Kameda J, Kaneyuki K, Karlen D, Kasami K, Kato I, Kearns E, Khabibullin M, Khanam F, Khotjantsev A, Kielczewska D, Kikawa T, Kim J, Kim JY, Kim SB, Kimura N, Kirby B, Kisiel J, Kitching P, Kobayashi T, Kogan G, Koike S, Konaka A, Kormos LL, Korzenev A, Koseki K, Koshio Y, Kouzuma Y, Kowalik K, Kravtsov V, Kreslo I, Kropp W, Kubo H, Kudenko Y, Kulkarni N, Kurjata R, Kutter T, Lagoda J, Laihem K, Laveder M, Lee KP, Le PT, Levy JM, Licciardi C, Lim IT, Lindner T, Litchfield RP, Litos M, Longhin A, Lopez GD, Loverre PF, Ludovici L, Lux T, Macaire M, Mahn K, Makida Y, Malek M, Manly S, Marchionni A, Marino AD, Marteau J, Martin JF, Maruyama T, Maryon T, Marzec J, Masliah P, Mathie EL, Matsumura C, Matsuoka K, Matveev V, Mavrokoridis K, Mazzucato E, McCauley N, McFarland KS, McGrew C, McLachlan T, Messina M, Metcalf W, Metelko C, Mezzetto M, Mijakowski P, Miller CA, Minamino A, Mineev O, Mine S, Missert AD, Mituka G, Miura M, Mizouchi K, Monfregola L, Moreau F, Morgan B, Moriyama S, Muir A, Murakami A, Murdoch M, Murphy S, Myslik J, Nakadaira T, Nakahata M, Nakai T, Nakajima K, Nakamoto T, Nakamura K, Nakayama S, Nakaya T, Naples D, Navin ML, Nelson B, Nicholls TC, Nishikawa K, Nishino H, Nowak JA, Noy M, Obayashi Y, Ogitsu T, Ohhata H, Okamura T, Okumura K, Okusawa T, Oser SM, Otani M, Owen RA, Oyama Y, Ozaki T, Pac MY, Palladino V, Paolone V, Paul P, Payne D, Pearce GF, Perkin JD, Pettinacci V, Pierre F, Poplawska E, Popov B, Posiadala M, Poutissou JM, Poutissou R, Przewlocki P, Qian W, Raaf JL, Radicioni E, Ratoff PN, Raufer TM, Ravonel M, Raymond M, Retiere F, Robert A, Rodrigues PA, Rondio E, Roney JM, Rossi B, Roth S, Rubbia A, Ruterbories D, Sabouri S, Sacco R, Sakashita K, Sánchez F, Sarrat A, Sasaki K, Scholberg K, Schwehr J, Scott M, Scully DI, Seiya Y, Sekiguchi T, Sekiya H, Shibata M, Shimizu Y, Shiozawa M, Short S, Siyad M, Smith RJ, Smy M, Sobczyk JT, Sobel H, Sorel M, Stahl A, Stamoulis P, Steinmann J, Still B, Stone J, Strabel C, Sulak LR, Sulej R, Sutcliffe P, Suzuki A, Suzuki K, Suzuki S, Suzuki SY, Suzuki Y, Suzuki Y, Szeglowski T, Szeptycka M, Tacik R, Tada M, Takahashi S, Takeda A, Takenaga Y, Takeuchi Y, Tanaka K, Tanaka HA, Tanaka M, Tanaka MM, Tanimoto N, Tashiro K, Taylor I, Terashima A, Terhorst D, Terri R, Thompson LF, Thorley A, Toki W, Tomaru T, Totsuka Y, Touramanis C, Tsukamoto T, Tzanov M, Uchida Y, Ueno K, Vacheret A, Vagins M, Vasseur G, Wachala T, Walding JJ, Waldron AV, Walter CW, Wanderer PJ, Wang J, Ward MA, Ward GP, Wark D, Wascko MO, Weber A, Wendell R, West N, Whitehead LH, Wikström G, Wilkes RJ, Wilking MJ, Wilson JR, Wilson RJ, Wongjirad T, Yamada S, Yamada Y, Yamamoto A, Yamamoto K, Yamanoi Y, Yamaoka H, Yanagisawa C, Yano T, Yen S, Yershov N, Yokoyama M, Zalewska A, Zalipska J, Zambelli L, Zaremba K, Ziembicki M, Zimmerman ED, Zito M, and Żmuda J

Abstract

The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3)  eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy.

Published
2011
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11. Search for proton decay via p-->e+pi0 and p-->micro+pi0 in a large water Cherenkov detector.

Author

Nishino H, Clark S, Abe K, Hayato Y, Iida T, Ikeda M, Kameda J, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Ogawa H, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Takeuchi Y, Ueno K, Ueshima K, Watanabe H, Yamada S, Hazama S, Higuchi I, Ishihara C, Kajita T, Kaneyuki K, Mitsuka G, Okumura K, Tanimoto N, Vagins MR, Dufour F, Kearns E, Litos M, Raaf JL, Stone JL, Sulak LR, Wang W, Goldhaber M, Dazeley S, Svoboda R, Bays K, Casper D, Cravens JP, Kropp WR, Mine S, Regis C, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Fechner M, Scholberg K, Walter CW, Wendell R, Tasaka S, Learned JG, Matsuno S, Watanabe Y, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Minamino A, Nakaya T, Yokoyama M, Fukuda Y, Itow Y, Tanaka T, Jung CK, Lopez G, McGrew C, Terri R, Yanagisawa C, Tamura N, Idehara Y, Sakuda M, Kuno Y, Yoshida M, Kim SB, Yang BS, Ishizuka T, Okazawa H, Choi Y, Seo HK, Furuse Y, Nishijima K, Yokosawa Y, Koshiba M, Totsuka Y, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Thrane E, and Wilkes RJ

Abstract

We have searched for proton decays via p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} modes, respectively.

Published
2009
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12. Measurement of atmospheric neutrino flux consistent with tau neutrino appearance.

Author

Abe K, Hayato Y, Iida T, Ishihara K, Kameda J, Koshio Y, Minamino A, Mitsuda C, Miura M, Moriyama S, Nakahata M, Obayashi Y, Ogawa H, Shiozawa M, Suzuki Y, Takeda A, Takeuchi Y, Ueshima K, Higuchi I, Ishihara C, Ishitsuka M, Kajita T, Kaneyuki K, Mitsuka G, Nakayama S, Nishino H, Okumura K, Saji C, Takenaga Y, Totsuka Y, Clark S, Desai S, Dufour F, Kearns E, Likhoded S, Litos M, Raaf JL, Stone JL, Sulak LR, Wang W, Goldhaber M, Casper D, Cravens JP, Kropp WR, Liu DW, Mine S, Regis C, Smy MB, Sobel HW, Vagins MR, Ganezer KS, Hill JE, Keig WE, Jang JS, Kim JY, Lim IT, Scholberg K, Tanimoto N, Walter CW, Wendell R, Ellsworth RW, Tasaka S, Guillian E, Learned JG, Matsuno S, Messier MD, Ichikawa AK, Ishida T, Ishii T, Iwashita T, Kobayashi T, Nakadaira T, Nakamura K, Nitta K, Oyama Y, Suzuki AT, Hasegawa M, Kato I, Maesaka H, Nakaya T, Nishikawa K, Sasaki T, Sato H, Yamamoto S, Yokoyama M, Haines TJ, Dazeley S, Hatakeyama S, Svoboda R, Sullivan GW, Habig A, Gran R, Fukuda Y, Sato T, Itow Y, Koike T, Jung CK, Kato T, Kobayashi K, Malek M, McGrew C, Sarrat A, Terri R, Yanagisawa C, Tamura N, Sakuda M, Sugihara M, Kuno Y, Yoshida M, Kim SB, Yoo J, Ishizuka T, Okazawa H, Choi Y, Seo HK, Gando Y, Hasegawa T, Inoue K, Ishii H, Nishijima K, Ishino H, Watanabe Y, Koshiba M, Kielczewska D, Zalipska J, Berns HG, Shiraishi KK, Washburn K, and Wilkes RJ

Abstract

A search for the appearance of tau neutrinos from nu(mu) <--> nu(tau) oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of 138+/-48(stat)-32(+15)(syst) events is obtained with an expectation of 78+/-26(syst). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.

Published
2006
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