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Search for short baseline ν_e disappearance with the T2K near detector

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arxiv 1410.8811 v1 pith:36NHASPR submitted 2014-10-31 hep-ex

Search for short baseline ν_e disappearance with the T2K near detector

K. Abe , J. Adam , H. Aihara , T. Akiri , C. Andreopoulos , S. Aoki , A. Ariga , S. Assylbekov
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D. Autiero M. Barbi G.J.Barker G.Barr M.Bass M.Batkiewicz F.Bay V.Berardi B.E.Berger S.Berkman S.Bhadra F.d.M. Blaszczyk A. Blondel C. Bojechko S. Bordoni S.B. Boyd D. Brailsford A. Bravar C. Bronner N. Buchanan R.G. Calland J. Caravaca Rodr\'iguez S.L. Cartwright R. Castillo M.G. Catanesi A. Cervera D. Cherdack G. Christodoulou A. Clifton J. Coleman S.J. Coleman G. Collazuol K. Connolly L. Cremonesi A. Dabrowska I. Danko R. Das S. Davis P. de Perio G. De Rosa T. Dealtry S.R. Dennis C. Densham D. Dewhurst F. Di Lodovico S.Di Luise O.Drapier T.Duboyski K.Duffy J.Dumarchez S.Dytman M.Dziewiecki S. Emery-Schrenk A. Ereditato L. Escudero A.J. Finch G.A. Fiorentini Aguirre M. Friend Y. Fujii Y. Fukuda A.P. Furmanski V. Galymov S. Giffin C. Giganti K. Gilje D. Goeldi T. Golan M. Gonin N. Grant D. Gudin D.R. Hadley L. Haegel A. Haesler M.D. Haigh P. Hamilton D. Hansen T. Hara M. Hartz T. Hasegawa N.C. Hastings T. Hayashino Y. Hayato C. Hearty R.L. Helmer M. Hierholzer J. Hignight A. Hillairet A. Himmel T. Hiraki S. Hirota J. Holeczek S. Horikawa K. Huang A.K. Ichikawa K. Ieki M. Ieva M. Ikeda J. Imber J. Insler T.J. Irvine T. Ishida T. Ishii E. Iwai K. Iwamoto K. Iyogi A. Izmaylov A. Jacob B. Jamieson M. Jiang S. Johnson J.H. Jo P. Jonsson C.K. Jung M. Kabirnezhad A.C. Kaboth T. Kajita H. Kakuno J. Kameda Y. Kanazawa D. Karlen I. Karpikov T. Katori E. Kearns M. Khabibullin A. Khotjantsev D. Kielczewska T. Kikawa A. Kilinski J. Kim S. King J. Kisiel P. Kitching T. Kobayashi L. Koch A. Kolaceke A. Konaka L.L. Kormos A. Korzenev Y. Koshio W. Kropp H. Kubo Y. Kudenko R. Kurjata T. Kutter J. Lagoda I. Lamont E. Larkin M. Laveder M. Lawe M. Lazos T. Lindner C. Lister R.P. Litchfield A. Longhin L. Ludovici L. Magaletti K. Mahn M. Malek S. Manly A.D. Marino J. Marteau J.F. Martin P. Martins S. Martynenko T. Maruyama V. Matveev K. Mavrokoridis E. Mazzucato M. McCarthy N. McCauley K.S. McFarland C. McGrew A. Mefodiev C. Metelko M. Mezzetto P. Mijakowski C.A. Miller A. Minamino O. Mineev A. Missert M. Miura S. Moriyama Th.A. Mueller A. Murakami M. Murdoch S. Murphy J. Myslik T. Nakadaira M. Nakahata K. Nakamura S. Nakayama T. Nakaya K. Nakayoshi C. Nantais C. Nielsen M. Nirkko K. Nishikawa Y. Nishimura J.Nowak H.M.O'Keeffe R.Ohta K.Okumura T.Okusawa W.Oryszczak S.M.Oser T.Ovsyannikova R.A. Owen Y. Oyama V. Palladino J.L. Palomino V. Paolone D. Payne O. Perevozchikov J.D. Perkin Y. Petrov L.Pickard E.S.Pinzon Guerra C.Pistillo P.Plonski E.Poplawska B.Popov M.Posiadala-Zezula J.-M. Poutissou R. Poutissou P. Przewlocki B. Quilain E. Radicioni P.N. Ratoff M. Ravonel M.A.M. Rayner A. Redij M. Reeves E. Reinherz-Aronis C. Riccio P.A. Rodrigues P. Rojas E. Rondio S. Roth A. Rubbia D. Ruterbories R. Sacco K. Sakashita F. S\'anchez F. Sato E. Scantamburlo K. Scholberg S. Schoppmann J. Schwehr M. Scott Y. Seiya T. Sekiguchi H. Sekiya D. Sgalaberna F. Shaker D. Shaw M. Shiozawa S. Short Y. Shustrov P. Sinclair B. Smith M. Smy J.T. Sobczyk H. Sobel M. Sorel L. Southwell P. Stamoulis J. Steinmann B. Still Y. Suda A. Suzuki K. Suzuki S.Y. Suzuki Y. Suzuki R. Tacik M. Tada S. Takahashi A. Takeda Y.Takeuchi H.K.Tanaka H.A.Tanaka M.M.Tanaka D.Terhorst R.Terri L.F.Thompson A.Thorley S. Tobayama W. Toki T. Tomura Y. Totsuka C. Touramanis T. Tsukamoto M. Tzanov Y. Uchida A. Vacheret M. Vagins G. Vasseur T. Wachala K. Wakamatsu C.W. Walter D. Wark W. Warzycha M.O. Wascko A. Weber R. Wendell R.J. Wilkes M.J. Wilking C. Wilkinson Z. Williamson J.R. Wilson R.J. Wilson T. Wongjirad Y. Yamada K. Yamamoto C. Yanagisawa T. Yano S. Yen N. Yershov M. Yokoyama K. Yoshida T. Yuan M. Yu A. Zalewska J. Zalipska L. Zambelli K. Zaremba M. Ziembicki E.D.Zimmerman M. Zito J. Zmuda
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The T2K experiment has performed a search for $\nu_e$ disappearance due to sterile neutrinos using $5.9 \times 10^{20}$ protons on target for a baseline of $280 m$ in a neutrino beam peaked at about $500 MeV$. A sample of \nu_e CC interactions in the off-axis near detector has been selected with a purity of 63\% and an efficiency of 26\%. The p-value for the null hypothesis is 0.085 and the excluded region at 95\% CL is approximately $sin^2 2 \theta_{ee} > 0.3$ for $\Delta m^2_{eff} > 7 eV^2 / c^4$.

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