YASUDA Osamu

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Name
YASUDA Osamu
URL
http://musashi.phys.se.tmu.ac.jp/~yasuda/indexe.html
Affiliation
Tokyo Metropolitan University
Section
Graduate School of Science and Engineering, Department of Physics
Job title
Professor
Degree
Doctor of Science(The University of Tokyo), Master of Science(The University of Tokyo)
Research funding number
50183116
ORCID ID
0000-0001-5446-583X

Research Areas

 
 

Academic & Professional Experience

 
Apr 2013
 - 
Today
Professor, Faculty of Science and Engineering, Tokyo Metropolitan University
 
Apr 2005
 - 
Mar 2013
Associate Professor, Faculty of Science and Engineering, Tokyo Metropolitan University
 
Apr 1991
 - 
Mar 2005
Assistant Professor, Department of Physics, Tokyo Metropolitan University
 
Jan 1999
 - 
Jun 1999
Visiting Professor, Department of Physics, University of Oregon
 
Sep 1989
 - 
Mar 1991
postdoctoral fellow, Department of Physics and Astronomy, University of North Carolina
 
Sep 1986
 - 
Aug 1989
Weingart Research Fellow, Department of Physics, California Institute of Technology
 
Apr 1986
 - 
Aug 1986
JSPS postdoctoral fellow, Theory Division, High Energy Accelerator Research Organization
 

Published Papers

 
Ghosh Monojit, Yasuda Osamu
   Sep 2017   [Refereed]
It has been known that a tension between the mass-squared differences obtained from the solar neutrino and KamLAND experiments may be solved by introducing the Non-Standard flavor-dependent Interaction (NSI) in neutrino propagation. We discuss the...
Yasuda Osamu
PoS   NOW2016 029   Feb 2017   [Refereed]
In this talk we discuss the possibility to test a hypothesis, which explains the tension between the mass-squared differences of the solar neutrino and KamLAND experiments from the non-standard flavor-dependent interaction in neutrino propagation,...
Ghosh Monojit, Yasuda Osamu
Phys. Rev.   D96(1) 013001   Feb 2017   [Refereed]
T2HK and T2HKK are the proposed extensions of the T2K experiments in Japan and DUNE is the future long-baseline program of Fermilab. These three experiments will use extremely high beam power and large detector volumes to observe neutrino oscillat...
Shinya Fukasawa, Osamu Yasuda
Nuclear Physics B   914 99   Jan 2017   [Refereed]
Fukasawa Shinya, Ghosh Monojit, Yasuda Osamu
Phys. Rev.   D95(5) 055005   Nov 2016   [Refereed]
If the flavor-dependent nonstandard interactions (NSIs) in neutrino propagation exist, then the matter effect is modified, and the modification is parametrized by the dimensionless parameter εαβ (α, β=e, μ, τ). In this paper, we discuss the sensit...
Yasuda Osamu
   Oct 2016   [Refereed]
In this talk we discuss the possibility to test the hypothesis, which has been proposed to explain the tension between the mass-squared differences of the solar neutrino and KamLAND experiments by the non-standard flavor-dependent interaction in n...
Yasuda Osamu, Fukasawa Shinya, Ghosh Monojit
   Oct 2016   [Refereed]
In this talk we present our results on the sensitivity to the neutrino mass hierarchy, the octant of the mixing angle and the CP phase in the future long baseline experiments T2HK and DUNE as well as in the atmospheric neutrino observation at Hype...
Fukasawa Shinya, Ghosh Monojit, Yasuda Osamu
   Sep 2016   [Refereed]
In this work we present a scenario in which a nonstandard interaction in neutrino propagation can explain the three major tensions in the neutrino oscillation data at present. These tensions are: (i) a non-zero best-fit value of the non-standard o...
Fukasawa Shinya, Ghosh Monojit, Yasuda Osamu
Nucl. Phys.   B918 337-357   Jul 2016   [Refereed]
In this work we investigate the sensitivity to the neutrino mass hierarchy, the octant of the mixing angle θ23 and the CP phase δCP in the future long baseline experiments T2HK and DUNE as well as in the atmospheric neutrino observation at Hyperka...
Yasuda Osamu
J. Phys. Conf. Ser.   718(6) 062072   Jan 2016   [Refereed]
The sensitivity of the atmospheric neutrino experiments to the non-standard flavor-dependent interaction in neutrino propagation is studied under the assumption that the only nonvanishing components of the non-standard matter effect are the electr...
Fukasawa Shinya, Yasuda Osamu
Adv. High Energy Phys.   2015 820941   Mar 2015   [Refereed]
The sensitivity of the atmospheric neutrino experiments to the non-standard flavor-dependent interaction in neutrino propagation is studied under the assumption that the only nonvanishing components of the non-standard matter effect are the electr...
Yasuda Osamu
PoS   NUFACT2014 045   Feb 2015   [Refereed]
We investigate the constraint on the flavor-dependent neutral current Non-Standard Interactions in propagation from atmospheric neutrino experiments Superkamiokande and Hyperkamiokande. With the ansatz where the parameters which have strong constr...
Yasuda Osamu
Nucl. Part. Phys. Proc.   273-275 1789-1794   Oct 2014   [Refereed]
It is shown how to obtain the analytical expression for the effective mixing angle in matter using the formalism which was developed by Kimura, Takamura and Yokomakura. If the baseline of the neutrino path is long enough so that averaging over rap...
Yasuda Osamu
PoS   NUFACT2014 045   Feb 2015   [Refereed]
We investigate the constraint on the flavor-dependent neutral current Non-Standard Interactions in propagation from atmospheric neutrino experiments Superkamiokande and Hyperkamiokande. With the ansatz where the parameters which have strong constr...
Yasuda Osamu
Phys. Rev.   89(9,Pt.A) 1-93023   Feb 2014   [Refereed]
It is shown that it is possible to obtain the analytical expression for the effective mixing angle in matter using the formalism which was developed by Kimura, Takamura and Yokomakura for the neutrino oscillation probability in matter with constan...
Chiba Masami, others
AIP Conf. Proc.   1535 45-50   Jul 2013   [Refereed]
We have found a radio-wave-reflection effect in rock salt for the detection of ultra-high energy neutrinos which are expected to be generated in Greisen, Zatsepin, and Kuzmin (GZK) processes in the universe. When an UHE neutrino interacts with roc...
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   253-255 139-142   Nov 2012   [Refereed]
Status of neutrino oscillation study is briefly reviewed. Some aspects relevant to tau physics are also
Tanikawa Takahiro, others
AIP Conf. Proc.   1484(1) 390-393   Nov 2012   [Refereed]
An ultra-high-energy neutrino (UHEν) gives temperature rise along the hadronic and electromagnetic shower when it enters into rock salt or ice. Permittivities of them arise with respect the temperatures at ionization processes of the UHEν shower. ...
Chiba Masami, others
AIP Conf. Proc.   1484(1) 409-411   Nov 2012   [Refereed]
We had found radio-wave-reflection effect in rock salt for detection of an ultra-high energy neutrino (UHEν) which is generated in GZK processes in the universe. When an UHEν interacts with rock salt or ice as a detection medium, the energy conver...
Abazajian K. N, others
   Apr 2012   [Refereed]
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and the latest astrophysical
Donini Andrea, Huber Patrick, Pascoli Silvia, Winter Walter, Yasuda Osamu
Nucl. Phys. Proc. Suppl.   229-232 516   2012   [Refereed]
We discuss recent results and current issues of the IDS-NF (International Design Study for the Neutrino Factory) physics and performance evaluation group
Chiba Masami, others
Nucl. Instrum. Meth.   A662 S222-S225   2012   [Refereed]
Detection of GZK (Greisen, Zatsepin and Kuzmin) neutrinos that have an energy larger than 1x10^1^6eV are expected to explore ultra-high-energy (UHE) interactions between UHE protons (>4x10^1^9eV) and cosmic-microwave background in the cosmological...
Yasuda Osamu
Acta Phys. Polon.   42(11) 2379-2387   Oct 2011   [Refereed]
The sensitivity to the sterile neutrino mixing at very short baseline reactor neutrino experiments is investigated. If the reactor core is relatively large as in the case of commercial reactors, then the sensitivity is lost for $\Delta m^2 \gtrsim...
Yasuda Osamu
JHEP   09 036   Jul 2011   [Refereed]
The sensitivity to the sterile neutrino mixing at very short baseline reactor neutrino experiments is investigated. In the case of conventional (thermal neutron) reactors it is found that the sensitivity is lost for Tex 1 eVTex d...
Choubey S, others
   Mar 2011   [Refereed]
The International Design Study for the Neutrino Factory (the IDS-NF) was established by the community at the ninth 'International Workshop on Neutrino Factories, super-beams, and beta- beams' which was held in Okayama in August 2007. The IDS-NF ma...
Yasuda Osamu
AIP Conf. Proc.   1382 103-105   Dec 2010   [Refereed]
Some attempts which were made to explain the MINOS anomaly are critically discussed. They include the non-standard neutral current-neutrino interaction and the (3+1)-scheme with sterile
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   217 220-222   Nov 2010   [Refereed]
Assuming only the non-zero electron and tau neutrino components Tex, Tex, Tex of the non-standard matter effect and postulating the atmospheric neutrino constraint $\epsilon_{\tau\tau}=|\epsilon_{e\tau}...
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   229-232 543   Oct 2010   [Refereed]
From the analytic oscillation probability for high energy atmospheric neutrinos in the presence of new physics in propagation, it is argued that the components Tex and Tex as well as the quantity $|\epsilon_{\tau...
Alonso Rodrigo, others
   Sep 2010   [Refereed]
Recent developments on tau detection technologies and the construction of high intensity neutrino beams open the possibility of a high precision search for non-standard {\mu} - {\tau} flavour transition with neutrinos at short distances. The MINSI...
Yasuda Osamu
300-313   Apr 2010   [Refereed]
Sensitivity of a neutrino factory to various mixing angles in a scheme with one sterile neutrino is studied using νe → νμ, νμ → νμ, νe → ντ and νμ → ντ. While ...
Oki Haruna, Yasuda Osamu
Phys. Rev.   82(7) 1-73009   Mar 2010   [Refereed]
Assuming only the non-zero electron and tau neutrino components Tex, Tex, Tex of the non-standard matter effect and postulating the atmospheric neutrino constraint $\epsilon_{\tau\tau}=|\epsilon_{e\tau}...
Chiba Masami, others
Nucl. Instrum. Meth.   604(1-2) 233-235   2009   [Refereed]
Existence of GZK neutrinos (ultra-high-energy neutrinos) has been justified although the flux is estimated to be extremely low. A study of radar method of UHF radio wave was carried out using a 2 MeV electron beam on a rock salt target. Radio wave...
Donini Andrea, Fuki Ken-ichi, Lopez-Pavon J, Meloni Davide, Yasuda Osamu
JHEP   08 041   Dec 2008   [Refereed]
We study the potential of a Neutrino Factory in constraining the parameter space of a scheme with one sterile neutrino separated from three active ones by O(1)eV^2. We present approximated analytic expressions for the oscillation probabilities, sh...
Fuki Ken-ichi, Donini Andrea, Meloni Davide, Lopez-Pavon J, Yasuda Osamu
PoS   NUFACT08 123   Jul 2008   [Refereed]
Yasuda Osamu, Donini Andrea
PoS   NUFACT08 146   Jul 2008   [Refereed]
Yasuda Osamu
PoS   NUFACT08 016   Jul 2008   [Refereed]
Donini Andrea, Yasuda Osamu
   Jun 2008   [Refereed]
Even after the negative result by the MiniBooNE experiment, we can still have a (3+1)-scheme with one sterile neutrino whose mixing lies within the allowed region by MiniBooNE. In this note we discuss the possible effects of such a scheme on the f...
Hernandez Pilar, Walter Christopher W, Yasuda Osamu
AIP Conf. Proc.   981 135-138   2008   [Refereed]
The theoretical and experimental issues discussed in working group one at Nufact07 are
Donini Andrea, Huber Patrick, Pascoli Silvia, Winter Walter, Yasuda Osamu
AIP Conf. Proc.   981 43-45   Dec 2007   [Refereed]
We summarize the objectives and results of the ``international scoping study of a future neutrino factory and superbeam facility'' (ISS) physics working group. Furthermore, we discuss how the ISS study should develop into a neutrino factory design...
Chiba Masami, others
850-853   Oct 2007   [Refereed]
Existence of GZK neutrinos (ultra high energy neutrinos) have been justified although the flux is very low. A new method is desired to use a huge mass of a detector medium to detect them. A fundamental study of radar method was carried out to meas...
Bandyopadhyay A.
Rept. Prog. Phys.   72 106201   Oct 2007   [Refereed]
The conclusions of the Physics Working Group of the international scoping study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried by the international community between NuFact05, (the 7th Internation...
Yasuda Osamu
Acta Phys. Polon.   B38 3381-3388   Oct 2007   [Refereed]
We discuss the implications of new physics, which modifies the matter effect in neutrino oscillations, to long baseline experiments, particularly the MINOS experiment. An analytic formula in the presence of such a new physics interaction is derive...
Yasuda Osamu
   Apr 2007   [Refereed]
The exact formula for the neutrino oscillation probability in matter with constant density, which was discovered by Kimura, Takamura and Yokomakura, has been applied mostly to the standard case with three flavor neutrino so far. In this paper appl...
Fernandez-Martinez E, Gavela M. B, Lopez-Pavon J, Yasuda O.
Phys. Lett.   649(5-6) 427-435   Mar 2007   [Refereed]
A low-energy non-unitary leptonic mixing matrix is a generic effect of a large class of theories accounting for neutrino masses. It is shown how the extra CP-odd phases of a general non-unitary matrix allow for sizeable CP-asymmetries in channels ...
Aoki M, others
   Jul 2006   [Refereed]
One of the current most-demanded experiments in neutrino physics is to measure the last mixing angle theta_13. KASKA is an experiment to detect new type of reactor neutrino oscillation and to measure sin^2 2theta_13 accurately using the world's mo...
Chiba M, others
J. Phys. Conf. Ser.   81 012003   2007   [Refereed]
Ultra high-energy (UHE) neutrinos (Egt10(15) eV) is expected to exist due to presence of the cosmic microwave background and UHE cosmic rays implied by Greisen, Zatsepin and Kuz'min (GZK). The low rate of GZK neutrinos requires us to utilize a lar...
Kitazawa Noriaki, Sugiyama Hiroaki, Yasuda Osamu
   Jun 2006   [Refereed]
The effect of non-standard neutrino interactions with matter at long baseline neutrino experiments is examined in a model independent way, taking into account the constraints from all the experiments. It is found that such a non-standard interacti...
Chiba M, others
J. Phys. Conf. Ser.   81 012003   2007   [Refereed]
Ultra high-energy (UHE) neutrinos (Egt10(15) eV) is expected to exist due to presence of the cosmic microwave background and UHE cosmic rays implied by Greisen, Zatsepin and Kuz'min (GZK). The low rate of GZK neutrinos requires us to utilize a lar...
Watanabe Yusuke, others
315-318   Feb 2006   [Refereed]
Long K, Messier M. D, Yasuda O.
Nucl. Phys. Proc. Suppl.   155 102-110   2006   [Refereed]
The Neutrino Oscillation Physics working group at NuFactO5 discussed the status of the present generation of experiments, the plans for the next generation, and the physics performance of the various proposed second generation facilities. The pres...
Watanabe Y, others
Int. J. Mod. Phys.   21 50-54   2006   [Refereed]
[,50(2006)]
Ultra high-energy (UHE) neutrino (1015 eV <) detection in natural huge rock salt formation has been studied. Radio wave is generated by Askar'yan effect in rock salt. That is caused by the number asymmetry of electrons and positrons...
Ota T, Yasuda O.
Nucl. Phys. Proc. Suppl.   155 174-175   2006   [Refereed]
The idea to solve the parameter degeneracies by using the combination of ν e → ν μ and ν ¯ μ → ...
Chiba M, others
Int. J. Mod. Phys.   21 25-29   2006   [Refereed]
Ultra high energy (UHE) neutrinos with the energy larger than 1015 eV, surely arrive at the earth with Greisen, Zatsepin, Kuz'min (GZK) effect, though the rate is very few. The rare call requires us to utilize a large mass (>10 Gton) of detecti...
Watanabe Y, others
AIP Conf. Proc.   847 491-493   2006   [Refereed]
[,491(2006)]
Detection possibility of ultra high‐energy (UHE) neutrino (E >1015 eV) in natural huge rock salt formation has been studied. Collision between the UHE neutrino and the rock salt produces electromagnetic (EM) shower. Charge diff...
Sugiyama H, Yasuda O.
Int. J. Mod. Phys.   22(20) 3407-3428   Aug 2005   [Refereed]
Using an analytical approach, the sensitivity to sin^2{2theta_13} with infinite statistics in a spectral analysis is investigated in reactor neutrino oscillation experiments with one reactor and two identical detectors. We derive an useful formula...
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   143(1-3 SPEC. ISS.) 528-528   Dec 2004   [Refereed]
It is shown that plots of constant probabilities in the Tex plane enable us to see eightfold degeneracy easily. Using this plot, I discuss how an additional long baseline measurement resolves degeneracies after the J...
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   149 170-172   Dec 2004   [Refereed]
[,170(2004)]
Assuming that the JPARC experiment measures the oscillation probabilities Tex and Tex at Tex, I discuss what kind of extra experiment (long baseline or reactor) c...
Sugiyama H, Yasuda O, Suekane F, Horton-Smith G. A.
Phys. Rev.   D73 053008   Sep 2004   [Refereed]
Sensitivities to sin^2{2theta_{13}} without statistical errors (``systematic limit'') are investigated in neutrino oscillation experiments with multiple reactors. Using an analytical approach, we show that the systematic limit on sin^2{2theta_{13}...
Yasuda Osamu
212-219   May 2004   [Refereed]
It is emphasized that resolution of the Tex ambiguity is important for determination of Tex if Tex, and resolution of the sgn(Tex) ambiguity is important for determination of the CP phase $\delt...
Yasuda Osamu
New J. Phys.   6 83   May 2004   [Refereed]
It is shown that eightfold degeneracy in neutrino oscillations is easily seen by plotting constant probabilities in the Tex plane. Using this plot, we discuss how an additional long baseline measurement resolves dege...
Yasuda Osamu
   Mar 2004   [Refereed]
Reactor experiments offer a promising way to determine Tex and are free from parameter degeneracies in neutrino oscillations. It is described how reactor measurements of Tex can be improved by a near-far detector complex...
Anderson K, others
   Jan 2004   [Refereed]
An International Working Group has been meeting to discuss ideas for a new Nuclear Reactor Neutrino Experiment at meetings in May 2003 (Alabama), October 2003 (Munich) and plans for March 2004 (Niigata). This White Paper Report on the Motivation a...
Chiba M, Kamijo T, Yasuda O, Chikashige Y, Kon T, Takeoka Y, Yoshida R.
Phys. Atom. Nucl.   67(11) 2050-2053   2004   [Refereed]
Rock salt and limestone are studied to determine their suitability for use as a radio-wave transmission medium in an ultrahigh energy (UHE) cosmic neutrino detector. A sensible radio wave would be emitted by the coherent Cherenkov radiation from n...
Yasuda Osamu
AIP Conf. Proc.   721 190-193   Sep 2003   [Refereed]
[,190(2003)]
I describe how reactor measurements of Tex can be improved by a near-far detector complex. I show that in the Kashiwazaki plan it is potentially possible to measure Tex down to
Yasuda Osamu
208-215   May 2003   [Refereed]
Degeneracies of the neutrino oscillation parameters are explained using the Tex--Tex plane. Measurements of Tex by reactor experiments are free from the parameter degeneracies which occur in accelerator app...
Autin Bruno, Harris Deborah A, King Steve F. , McFarland Kevin Scott, Yasuda Osamu
J. Phys.   29(8) 1743-1755   Feb 2003   [Refereed]
Issues on the physics of, beamlines for, and detectors of neutrino oscillation discussed in Working Group 2 at Nufact'02 are
Minakata H, Sugiyama H, Yasuda O, Inoue K, Suekane F.
Phys. Rev.   68(3) 1-33017   Nov 2002   [Refereed]
[Erratum: Phys. Rev.D70,059901(2004)]
A possibility to measure Tex using reactor neutrinos is examined in detail. It is shown that the sensitivity Tex can be reached with 20 ton-year data by placing identical...
Yasuda Osamu
419-434   Sep 2002   [Refereed]
I briefly review the recent status of research on physics potential of neutrino factories including the discussions on parameter
Yasuda Osamu
259-268   Mar 2002   [Refereed]
I briefly review the recent status of research on physics potential of neutrino factories with emphasis on measurements of the CP
Yasuda Osamu
   Jan 2002   [Refereed]
Hernandez P, Yasuda O.
Nucl. Instrum. Meth.   485(3) 811-818   2002   [Refereed]
The potential of a neutrino factory based on muon storage rings at determining the neutrino mass matrix is
Yasuda Osamu
Nucl. Instrum. Meth.   503(1-2) 104-109   Nov 2001   [Refereed]
I will summarize theoretical issues in Working Group 1 at Nufact'01. Although there may not be complete agreement yet on the exact optimum baseline Tex and the muon energy Tex for measurements of the CP phase at a neutrino factory, all the wor...
Yasuda Osamu
1-6   Sep 2001   [Refereed]
I review briefly the recent status of research on neutrino oscillations, such as three and four flavor analysis of atmospheric neutrinos and solar neutrinos, and prospects of present and future long baseline
Pinney John, Yasuda Osamu
Phys. Rev.   D64 093008   May 2001   [Refereed]
Using Tex which is defined by the difference of the number of events with the CP phase Tex and the hypothetical one with Tex, we discuss correlations of errors of the CP phase and other oscillation parameters as well as the ...
Yasuda Osamu
134-143   Dec 2000   [Refereed]
Various solutions of the atmospheric neutrino data are reviewed. Apart from orthodox two flavor Tex oscillations and three flavor oscillations, there are still possibilities, such as four flavor oscillations with the (...
Kuno Yoshitaka, Mori Yoshiharu, Machida Shinji , Yokoi Takeichiro, Iwashita Yoshihisa, Sato Joe, Yasuda Osamu
   May 2001   [Refereed]
Chiba M, Kamijo T, Kawaki M, Athar H, Inuzuka M, Ikeda M, Yasuda O.
AIP Conf. Proc.   579 204-221   Nov 2000   [Refereed]
[,204(2000)]
Rock salt is studied as a radio wave transmission medium in an ultra high energy (UHE) cosmic neutrino detector. The radio wave would be generated by Askar’yan effect (coherent Chrenkov radiation from negative excess charges in the el...
Yasuda Osamu
151-163   Oct 2000   [Refereed]
Recent status of neutrino oscillation phenomenology with four neutrinos is reviewed. It is emphasized that the so-called (2+2)-scheme as well as the (3+1)-scheme are still consistent with the recent solar and atmospheric neutrino
Yasuda Osamu
Phys. Lett.   B516 111-115   Jun 2001   [Refereed]
It is shown generally that any oscillation probability in matter with approximately constant density coincides with that in vacuum to the first two nontrivial orders in Tex if Tex and Tex are
Yasuda Osamu
952-954   Jul 2000   [Refereed]
Analyis of the Superkamiokande atmospheric neutrino data is presented in the framework of four neutrinos without imposing constraints of Big Bang Nucleosynthesis. Implications to long baseline experiments are briefly
Yasuda Osamu
   Jun 2000   [Refereed]
Superkamiokande atmospheric neutrino data (contained and upward going through Tex events) for 990 days are analyzed in the framework of four neutrinos (three active and one sterile neutrinos) without imposing constraints of Big Bang Nucleosynthe...
Yasuda Osamu
271-274   Feb 2000   [Refereed]
I discuss the effects of neutrino oscillations on high energy cosmic neutrinos which come from cosmologically distant astrophysical sources. I incorporate all the up-to-date constraints from the solar, atmospheric, reactor, accelerator data and gi...
Yasuda Osamu
107-118   Dec 1999   [Refereed]
It is shown in the three flavor framework that neutrino factories enable us to measure some of the oscillation parameters, such as the sign of Tex, Tex, Tex. Some efforts are made to determine the parameters (the muon ...
Yasuda O.
223-235   Jun 1999   [Refereed]
Tokyo, Japan: Univ. Acad. Pr. (1999) 289 p      1999   [Refereed]
Yasuda Osamu
Nucl. Phys. Proc. Suppl.   77 146-150   Jun 1998   [Refereed]
The Tex and Tex solutions to the atmospheric neutrino problem are compared with Superkamiokande data. Both the solutions with a large mixing angle seem to be consistent with the
Athar H, Jezabek M, Yasuda O.
Phys. Rev.   D62 103007   May 2000   [Refereed]
Several cosmologically distant astrophysical sources may produce high-energy cosmic neutrinos (E \geq 10^6 GeV) of all flavors above the atmospheric neutrino background. We study the effects of vacuum neutrino mixing in three flavor framework on t...
Foot Robert, Volkas R. R, Yasuda O.
Phys. Lett.   B433 82-87   Feb 1998   [Refereed]
Neutrino oscillation scenarios involving large angle Tex oscillations are disfavoured in the parameter range Tex by recent results from the CHOOZ reactor-based Tex disappearance experiment. For ...
Yasuda Osamu
Nucl. Instrum. Meth.   A472 343-347   May 2000   [Refereed]
Superkamiokande atmospheric neutrino data for 990 days are analyzed in the framework of four neutrinos without imposing constraints of Big Bang Nucleosynthesis. It is shown that the wide range of the oscillation parameters is allowed at 90% confid...
Foot Robert, Volkas R. R, Yasuda O.
Phys. Rev.   D58 013006   Jan 1998   [Refereed]
The Tex and Tex solutions to the atmospheric neutrino problem are compared with SuperKamiokande data. The differences between these solutions due to matter effects in the Earth are calculated for the ratio ...
Minakata Hisakazu, Yasuda Osamu
Nucl. Phys.   B523 597-610   Dec 1997   [Refereed]
It has been known that there are two schemes in the framework of three flavor neutrinos to accommodate the global features of the hot dark matter neutrinos, the solar neutrino deficit and the atmospheric neutrino anomaly in a manner consistent wit...
Yasuda Osamu
   Jun 1997   [Refereed]
Using the published Kamiokande binned data for sub-GeV and multi-GeV atmospheric neutrinos, we have searched for the optimum set of three flavor neutrino oscillation parameters within the constraints of reactor experiments. It is found that chi^2 ...
Yasuda Osamu
Acta Phys. Polon.   B30 3089-3103   Sep 1999   [Refereed]
Using the result of the three flavor analysis of the old Kamiokande data, the recent Superkamiokande data of atmospheric neutrinos and the CHOOZ reactor data, it is shown that the third mixing angle Tex is small. It is proposed to determ...
Yasuda Osamu, Minakata Hisakazu
   Feb 1996   [Refereed]
We discuss constraints on three flavor neutrino mixings from the accelerator and reactor experiments, the Kamiokande multi-GeV data, and the solar neutrino observations. The LSND result is excluded at 90\%CL by the constraints imposed by all the d...
Yasuda Osamu
   Feb 1996   [Refereed]
Using the published Kamiokande data of the multi-GeV atmospheric neutrinos, we have searched the optimum set of the neutrino oscillation parameters among three flavors. It is found that Tex is minimized for (Tex, $\Delta m_{31}~...
Yasuda Osamu
0510-516   Mar 1994   [Refereed]
Possible breakdown of the universality of the gravitational couplings to different neutrino flavors can be tested in long-baseline neutrino-oscillation experiments, such as a proposed experiment at SOUDAN 2 or one at the DUMAND project. Such a bre...
Foot Robert, Leung Chung Ngoc, Yasuda O.
Phys. Lett.   B443 185-190   Sep 1998   [Refereed]
Recent Super-Kamiokande data on the atmospheric neutrino anomaly are used to test various mechanisms for neutrino oscillations. It is found that the current atmospheric neutrino data alone cannot rule out any particular mechanism. Future long-base...
Frampton Paul H, Yasuda Osamu
Phys. Rev.   44(11) 3709-3710   Mar 1991   [Refereed]
A model in which the Higgs boson is a tightly bound sark-antisark state is analyzed and the sark and Higgs-boson masses are
Yasuda Osamu
165-177   Jun 1998   [Refereed]
Superkamiokande atmospheric neutrino data for 414 days are analyzed in the framework of three flavor oscillations with mass hierarchy. It is shown that the best fit point is very close to the pure maximal Tex case and ...

Misc

 
Yasuda Osamu
日本物理學會誌   70(4) 242-243   Apr 2015
FUKASAWA Shinya, YASUDA Osamu
Meeting abstracts of the Physical Society of Japan   69(1)    Mar 2014
Chiba Masami, Yano Hiroyuki, Kamijo Tosiho, Yasuda Osamu, Yabuki Fumiaki, Inohara Yusuke, Ogushi Yuta, Kon Tadashi, Shimizu Yutaka, Chikashige Yuichi, Utsumi Michiaki, Fujii Masatoshi
Meeting abstracts of the Physical Society of Japan   69(1)    Mar 2014
Yano Hiroyuki, Kamijo Tosiho, Chiba Masami, Yasuda Osamu, Yabuki Fumiaki, Inohara Yuusuke, Ogushi Yuuta, Kon Tadashi, Shimizu Yutaka, Chikashige Yuichi, Utsumi Michiaki, Fujii Masatoshi
Meeting abstracts of the Physical Society of Japan   68(2)    Aug 2013
Ogushi Yuta, Inohara Yusuke, Kon Tadashi, Shimizu Yutaka, Chikashige Yuichi, Kamijo Tosiho, Chiba Masami, Yasuda Osamu, Yano Hiroyuki, Yabuki Fumiaki, Utsumi Michiaki, Fujii Masatoshi, Fujita Shuji
Meeting abstracts of the Physical Society of Japan   69(1)    Mar 2014

Books etc

 
International Workshop on Neutrino Factories Superbeams and Betabeams (9th : 2007 : Okayama Japan), Yasuda Osamu, Ohmori Chihiro, Mondal N. K. (Naba K.) (Part:Joint Editor)
American Institute of Physics   Feb 2008   ISBN:9780735405004
Minakata Hisakazu, Yasuda Osamu (Part:Joint Editor)
Universal Academy Press   1999   ISBN:4946443495

Teaching Experience

 
 

Association Memberships

 
 

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2015 - Mar 2018    Investigator(s): Osamu YASUDA
Ministry of Education, Culture, Sports, Science and Technology: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Project Year: Jul 2013 - Mar 2018    Investigator(s): Osamu YASUDA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2012 - Mar 2015    Investigator(s): Osamu YASUDA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2009 - Mar 2011    Investigator(s): Osamu YASUDA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research (C)
Project Year: Apr 2004 - Mar 2005    Investigator(s): Osamu YASUDA