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Search for τ→eγ decay at Belle
Hayasaka, K.,Abe, K.,Abe, K.,Aihara, H.,Asano, Y.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,ko, M.,Brodzicka, J.,Browder, T.E.,Cha Elsevier 2005 Physics letters: B Vol.613 No.1
<P><B>Abstract</B></P><P>We have searched for the lepton-flavor-violating decay τ→eγ using a data sample of 86.7 fb<SUP>−1</SUP> collected with the Belle detector at the KEKB asymmetric <SUP>e+</SUP><SUP>e−</SUP> collider. No evidence for a signal is obtained, and we set an upper limit for the branching fraction B(τ→eγ)<3.9×<SUP>10−7</SUP> at the 90% C.L.</P>
정홍진,Takehiro Hayasaka,Eiji Shamoto 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.5
In the present study, monitoring of elliptical vibration cutting process by utilizing internal data in the ultrasonic elliptical vibration device without external sensors such as a dynamometer and displacement sensor is investigated. The internal data utilized here is the change of excitation frequency, i.e. resonant frequency of the device, voltages applied to the piezoelectric actuators composing the device, and electric currents flowing through the actuators. These internal data change automatically in the elliptical vibration control system in order to keep a constant elliptical vibration against the change of the cutting process. Correlativity between the process and the internal data is described by using a vibration model of ultrasonic elliptical vibration cutting and verified by several experiments, i.e. planing and mirror surface finishing of hardened die steel carried out with single crystalline diamond tools. As a result, it is proved that it is possible to estimate the elements of elliptical vibration cutting process, e.g. tool wear and machining load, which are important for stable cutting in such precision machining.
Joining and microstructural development of Ni-Al-Ti sheets under ball collisions
Romankov, S.,Hayasaka, Y.,Shchetinin, I.V.,Yoon, J.M. Elsevier Science 2012 Acta materialia Vol.60 No.5
Ni-Al-Ti sheets were fabricated using a ball-collision technique at room temperature in an ambient atmosphere. The 0.5mm thick Ni, Al and Ti foils were stacked and fixed at the top of a vibration chamber and ball-treated for durations of between 5 and 30min. The microstructural evolution of the sheets was investigated as a function of the processing time and the mass of the ball. Joining of materials was considered to have occurred when materials at the interface plasticized, flowed and came into intimate contact under the high pressure developed by the ball collisions. The key parameters of the process were impact energy and processing time. Larger balls with higher impact energy were more effective for joining, and smaller balls were more effective for grain refinement. The transformation difference in grain refinement was attributed to the impact frequency, which appeared to be higher for the smaller balls. Ball collisions may have refined the grains of the Ni and Ti sheets to the nanometer scale, thereby destroying the initial rolling texture and inducing the formation of the fiber texture. The formation and stability of the <111> fiber texture in Ni were affected by the ball mass.
Belle Collaboration,Hayasaka, K.,Inami, K.,Miyazaki, Y.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bozek, A.,Brako, M.,Browder, T.E.,Chang, M North-Holland Pub. Co 2010 Physics letters: B Vol.687 No.2
<P>We present a search for lepton-flavor-violating tau decays into three leptons (electrons or muons) using 782 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions between 1.5 x 10(-8) and 2.7 x 10(-8). (C) 2010 Elsevier B.V. All rights reserved.</P>
Search for lepton-flavor and lepton-number-violating τ→@?hh<sup>'</sup> decay modes
Belle Collaboration,Miyazaki, Y.,Hayasaka, K.,Adachi, I.,Aihara, H.,Asner, D.M.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Bay, A.,Bhardwaj, V.,Bhuyan, B.,Bischofberger, M.,Bozek, A.,Bracko, M.,Browder, T. North-Holland Pub. Co 2013 Physics letters: B Vol.719 No.4
We search for lepton-flavor and lepton-number-violating τ decays into a lepton (@?= electron or muon) and two charged mesons (h,h<SUP>'</SUP>=π<SUP>+/-</SUP> or K<SUP>+/-</SUP>) using 854 fb<SUP>-1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. We obtain 90% confidence level upper limits on the τ→@?hh<SUP>'</SUP> branching fractions in the range (2.0-8.4)x10<SUP>-8</SUP>. These results improve upon our previously published upper limits by factors of about 1.8 on average.
Ando, Sada,Nishiguchi, Y.,Hayasaka, K.,Iefuji, H.,Takahashi, J. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.6
Candida utilis can assimilate fatty acids, so it was hypothesized that the treatment of rice by Candida utilis would improve feed quality by reducing fat content and adding the yeast function that would stimulate rumen microbes. In this study, the oil assimilation ability of Candida utilis IFO1086, 0988, 0626 and the effect of treatment of Candida utilis IFO1086, IFO0626 on the nutrient contents of rice bran were examined. The effect of Candida utilis addition on the in vitro degradability of forage was also investigated. It was found that the oil assimilating ability of IFO1086 and IFO0626 was significantly (p<0.01) higher than that of IFO0988. Candida utilis treatment reduced the EE content and increased the CP, ADF and NDF percentage. The absolute amount of ether extract was decreased by 35.9% in IFO1086 and IFO0626 treatment. The absolute amount of crude protein was not changed by yeast treatment. The ADF and NDF amounts were increased. The addition of Candida utilis increased in vitro forage degradability significantly (p<0.05). Based on these results it can be postulated that treatment of rice bran by Candida utilis may improve feed quality by reducing fat content, increasing the CP content and adding the function of yeast for stimulating rumen microbes.