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Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

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arxiv 1403.2552 v2 pith:OKRBJUJQ submitted 2014-03-11 hep-ex

Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

T2K Collaboration: K. Abe , J. Adam , H. Aihara , T. Akiri , C. Andreopoulos , S. Aoki , A. Ariga , T. Ariga
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S. Assylbekov D. Autiero M. Barbi G.J. Barker G. Barr M. Bass M. Batkiewicz F. Bay S.W. Bentham V. Berardi B.E. Berger S. Berkman I. Bertram 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 F. Di Lodovico S. Di Luise O. Drapier T. Duboyski K. Duffy F. Dufour J. Dumarchez S. Dytman M. Dziewiecki S. Emery A. Ereditato L. Escudero A.J. Finch L. Floetotto M. Friend Y. Fujii Y. Fukuda A.P. Furmanski V. Galymov S. Giffin C. Giganti K. Gilje D. Goeldi T. Golan J.J. Gomez-Cadenas M. Gonin N. Grant D. Gudin D.R. Hadley A. Haesler M.D. Haigh P. Hamilton D. Hansen T. Hara M. Hartz T. Hasegawa N.C. Hastings 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 S.J. Ives E. Iwai K. Iyogi A. Izmaylov A. Jacob B. Jamieson R.A. 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 E. Kearns M. Khabibullin A. Khotjantsev D. Kielczewska T. Kikawa A. Kilinski J. Kim J. Kisiel P. Kitching T. Kobayashi L.Koch A. Kolaceke A. Konaka L.L. Kormos A. Korzenev K. Koseki Y. Koshio I. Kreslo W. Kropp H. Kubo Y. Kudenko S. Kumaratunga R. Kurjata T. Kutter J. Lagoda K. Laihem I. Lamont M. Laveder M. Lawe M. Lazos K.P. Lee T. Lindner C. Lister R.P. Litchfield A. Longhin L. Ludovici M. Macaire L. Magaletti K. Mahn M. Malek S. Manly A.D. Marino J. Marteau J.F. Martin T. Maruyama J. Marzec E.L. Mathie V. Matveev K. Mavrokoridis E. Mazzucato M. McCarthy N. McCauley K.S. McFarland C. McGrew C. Metelko M. Mezzetto P. Mijakowski C.A. Miller A. Minamino O. Mineev S. Mine A. Missert M. Miura L. Monfregola S. Moriyama Th.A. Mueller A. Murakami M. Murdoch S. Murphy J. Myslik T. Nagasaki T. Nakadaira M. Nakahata T. Nakai K. Nakamura S. Nakayama T. Nakaya K. Nakayoshi D. Naples C. Nielsen M. Nirkko K. Nishikawa Y. Nishimura H.M. O'Keeffe R. Ohta K. Okumura T. Okusawa W. Oryszczak S.M. Oser R.A. Owen Y. Oyama V. Palladino 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 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 F. Retiere A. Robert 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 M. Shiozawa S. Short Y. Shustrov P. Sinclair B. Smith R.J. 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 T. Szeglowski 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 K. Ueno A. Vacheret M. Vagins G. Vasseur T. Wachala A.V. Waldron C.W. Walter D. Wark 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 S. Yen N. Yershov M. Yokoyama 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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classification hep-ex
keywords neutrinoelectroncomponentbeamneutrinosnd280appearancedetector
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The T2K experiment has reported the first observation of the appearance of electron neutrinos in a muon neutrino beam. The main and irreducible background to the appearance signal comes from the presence in the neutrino beam of a small intrinsic component of electron neutrinos originating from muon and kaon decays. In T2K, this component is expected to represent 1.2% of the total neutrino flux. A measurement of this component using the near detector (ND280), located 280 m from the target, is presented. The charged current interactions of electron neutrinos are selected by combining the particle identification capabilities of both the time projection chambers and electromagnetic calorimeters of ND280. The measured ratio between the observed electron neutrino beam component and the prediction is 1.01+-0.10 providing a direct confirmation of the neutrino fluxes and neutrino cross section modeling used for T2K neutrino oscillation analyses. Electron neutrinos coming from muons and kaons decay are also separately measured, resulting in a ratio with respect to the prediction of 0.68+-0.30 and 1.10+-0.14, respectively.

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