123,362 research outputs found
Formation of ferromagnetic bulk amorphous Fe40Ni40P14B6 alloys
Ferromagnetic bulk amorphous Fe40Ni40P14B6 alloy rods with a diameter of 1.2
mm can be prepared by means of a rapid quenching technique. If a fluxing
technique is also used, amorphous rods with a diameter as large as 2.5 mm can
be synthesized. The critical cooling rate Rc for the glass formation
Fe40Ni40P14B6 is estimated to be on the order of 100 K.s-1Comment: 20 pages, 5 figures, 1 tabl
Induced top Yukawa coupling and suppressed Higgs mass parameters
In the scenarios with heavy top squarks, mass parameters of the Higgs field
must be fine-tuned due to a large logarithmic correction to the soft scalar
mass. We consider a new possibility that the top Yukawa coupling is small above
TeV scale. The large top mass is induced from strong Yukawa interaction of the
Higgs with another gauge sector, in which supersymmetry breaking parameters are
given to be small. Then it is found that the logarithmic correction to the
Higgs soft scalar mass is suppressed in spite of the strong coupling and the
fine-tuning is ameliorated. We propose an explicit model coupled to a
superconformal gauge theory which realizes the above situation.Comment: RevTeX4 style, 10 pages, 3 figure
Kamland Results
The LMA solution of the solar neutrino problem has been explored with the
1,000 ton liquid scinatillator detector, KamLAND. It utilizes nuclear power
reactors distributing effectively 180km from the experimental site. Comparing
observed neutrino rate with the calculation of reactor operation histories, an
evidence for reactor neutrino disapearance has been obtained from 162 ton-year
exposure data. This deficit is only compatible with the LMA solution and the
other solutions in the two neutrino oscillation hypotheisis are excluded at
99.95% confidence level.Comment: 8 pages, 5 figures, proceeding of the Moriond Conference "Electroweak
Interactions and Unified Thories
A pentaquark model of the negative parity Lambda(1405)
We test a pentaquark model of the negative parity hyperon Lambda(1405). We
use the model where valence four quarks and one antiquark move in a potential
relativisticaly and interact with themselves and each other through gluon and
NG boson. We calculate mass shift of the system and find that there are two
Lambda(1405) with almost degenerate mass: one flavor singlet and one flavor
octet. We calclate also sigma-term and scalar form factor of the hyperon and
show their usefulness to deduce the number of valence quark in the hypeon.Comment: 4 pages, 1 figure, to appear in the proceedings of the Yukawa
International Seminar (YKIS) 2006, "New frontiers in QCD", Kyoto, Japa
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