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arXiv · 1410.8811

Search for short baseline $\nu_e$ disappearance with the T2K near detector

K. Abe·J. Adam·H. Aihara·T. Akiri·C. Andreopoulos·S. Aoki·A. Ariga·S. Assylbekov·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 Rodríguez·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
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Abstract

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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K. Abe, J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A. Ariga, S. Assylbekov, 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 Rodríguez, 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. 2014-10-31. Search for short baseline $\nu_e$ disappearance with the T2K near detector. https://doi.org/10.1103/physrevd.91.051102

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