Showing papers by "Y. Hayato published in 2010"
Duke University1, University of Tokyo2, University of California, Irvine3, Boston University4, University of Wisconsin-Madison5, Brookhaven National Laboratory6, California State University, Dominguez Hills7, Chonnam National University8, Gifu University9, Kanagawa University10, Kobe University11, Kyoto University12, Miyagi University of Education13, Nagoya University14, Stony Brook University15, Niigata University16, Okayama University17, Osaka University18, Seoul National University19, Shizuoka University20, Sungkyunkwan University21, Tokai University22, Tsinghua University23, University of Warsaw24, University of Washington25, University of Minnesota26
TL;DR: In this article, a search for nonzero {theta}{sub 13} and deviations of sin{sup 2{theta}}{sub 23} from 0.04(0.09) and 1.9(1.5) was conducted.
Abstract: We present a search for nonzero {theta}{sub 13} and deviations of sin{sup 2{theta}}{sub 23} from 0.5 in the oscillations of atmospheric neutrino data from Super-Kamiokande I, II, and III. No distortions of the neutrino flux consistent with nonzero {theta}{sub 13} are found and both neutrino mass hierarchy hypotheses are in agreement with the data. The data are best fit at {Delta}m{sup 2}=2.1x10{sup -3} eV{sup 2}, sin{sup 2{theta}}{sub 13}=0.0, and sin{sup 2{theta}}{sub 23}=0.5. In the normal (inverted) hierarchy {theta}{sub 13} and {Delta}m{sup 2} are constrained at the one-dimensional 90% C.L. to sin{sup 2{theta}}{sub 13}<0.04(0.09) and 1.9(1.7)x10{sup -3}<{Delta}m{sup 2}<2.6(2.7)x10{sup -3} eV{sup 2}. The atmospheric mixing angle is within 0.407{<=}sin{sup 2{theta}}{sub 23{<=}}0.583 at 90% C.L.
278 citations
Kyoto University1, Autonomous University of Barcelona2, Fermilab3, Massachusetts Institute of Technology4, University of Valencia5, Columbia University6, Sapienza University of Rome7, Imperial College London8, Indiana University9, University of Tokyo10, Tokyo Institute of Technology11, Los Alamos National Laboratory12, TRIUMF13, Louisiana State University14, Nagoya University15, Yamagata University16, Purdue University17, University of Minnesota18, Kitasato University19, Stony Brook University20, University of Colorado Boulder21
TL;DR: In this article, the authors acknowledge the physics departments at Chonnam National University, Dongshin University, and Seoul National University for the loan of parts used in SciBar and the help in the assembly of SciBar.
Abstract: We acknowledge the Physics Department at Chonnam National University, Dongshin University, and Seoul National University for the loan of parts used in SciBar and the help in the assembly of SciBar. We wish to thank the Physics Departments at the University of Rochester and Kansas State University for the loan of Hamamatsu PMTs used in the MRD. We gratefully acknowledge support from Fermilab as well as various grants, contracts and fellowships from the MEXT and JSPS (Japan), the INFN (Italy), the Ministry of Science and Innovation and CSIC (Spain), the STFC (UK), and the DOE and NSF (USA). This work was supported by MEXT and JSPS with the Grant-in-Aid for Scientific Research A 19204026, Young Scientists S 20674004, Young Scientists B 18740145, Scientific Research on Priority Areas “New Developments of Flavor Physics”, and the global COE program “The Next Generation of Physics, Spun
from Universality and Emergence”. The project was supported by the Japan/U.S. Cooperation Program in the field of High Energy Physics and by JSPS and NSF under the Japan-U.S. Cooperative Science Program.
32 citations
Autonomous University of Barcelona1, Fermilab2, Massachusetts Institute of Technology3, University of Valencia4, Columbia University5, Sapienza University of Rome6, Imperial College London7, Indiana University8, University of Tokyo9, Nagoya University10, Tokyo Institute of Technology11, Kyoto University12, Los Alamos National Laboratory13, TRIUMF14, Louisiana State University15, Yamagata University16, Purdue University17, University of Minnesota18, Kitasato University19, Stony Brook University20, University of Colorado Boulder21
TL;DR: In this paper, the authors acknowledge the physics departments at Chonnam National University, Dongshin University, and Seoul National University for the loan of parts used in SciBar and the help in the assembly of SciBar.
Abstract: We acknowledge the Physics Department at Chonnam National University, Dongshin University, and Seoul National University for the loan of parts used in SciBar and the help in the assembly of SciBar. We wish to thank the Physics Departments at the University of Rochester and Kansas State University for the loan of Hamamatsu PMTs used in the MRD. We gratefully acknowledge support from Fermilab as well as various grants, contracts and fellowships from the MEXT and JSPS (Japan), the INFN (Italy), the Ministry of Science and Innovation and CSIC (Spain), the STFC (UK), and the DOE and NSF (USA). This work was supported by MEXT and JSPS with the Grant-in-Aid for Scientific Research A 19204026, Young Scientists S 20674004, Young Scientists B 18740145, Scientific Research on Priority Areas “New Developments of Flavor Physics”, and the global COE program “The Next Generation of Physics, Spun
from Universality and Emergence”. The project was supported by the Japan/U.S. Cooperation Program in the field of High Energy Physics and by JSPS and NSF under the Japan-U.S. Cooperative Science Program.
24 citations
01 Jan 2010
5 citations
24 May 2010
TL;DR: In this paper, an independent DAQ system is developed as a backup for such a nearby supernova burst, which can measure and record total number of hits in the detector using the digitized signals from the current front-end electronics.
Abstract: Super-Kamiokande is a ring imaging Cherenkov detector for astro-particle physics that consists of 50 ktons pure water and about 13000 photomultiplier tubes (PMT). As well as measuring atmospheric and solar neutrinos, one of the main purposes of the detector is to detect neutrinos from a supernova burst. In the case of a nearby supernova burst which occurs at a distance of 500 light years, the neutrino event rate in the Super-Kamiokande detector is expected to reach 30 MHz and it becomes a huge load for the current data acquisition (DAQ) system. Therefore we are developing an independent DAQ system as a backup for such a nearby supernova burst. This system will measure and record total number of hits in the detector using the digitized signals from the current front-end electronics, from which we can obtain a time variation of total charge deposited in the detector during the supernova burst period. The specification of the new system and current status of the development will be reported.