2,966 research outputs found
Precision Mass Determination of the Higgs Boson at Photon-Photon Colliders
We demonstrate a measurement of the Higgs boson mass by the method of energy
scanning at photon-photon colliders, using the high energy edge of the photon
spectrum. With an integrated luminosity of 50 it is possible to
measure the standard model Higgs mass to within 110 MeV in photon-photon
collisions for m_h=100 GeV. As for the total width of the Higgs boson, the
statistical error is expected for
m_h=100 GeV, if both and are
fixed at the predicted standard model value.Comment: 7 pages, 4 figures, Given at 3nd International Workshop on
Electron-Electron Interactions at TeV Energies, Dec 10-12, Santa Cruz,
California, 199
Specific heat study of spin-structural change in pyrochlore NdMoO
By measurements of specific heat, we have investigated the magnetic field
() induced spin-structural change in NdMoO that shows
spin-chirality-related magneto-transport phenomena. A broad peak around 2 K
caused by the ordering of 2-in 2-out structure of the Nd moments at zero
shifts to the lower temperature () up to around 3 T and then to the higher
above around 3 T with increasing for all the direction of . This is
due to the crossover from antiferromagnetic to ferromagnetic arrangement
between the Nd and Mo moments. While the peak increases monotonically above
3 T for //[100], another peak emerges around 0.9 K at 12 T for //[111],
which is ascribed to the ordering of 3-in 1-out structure. For //[110], a
spike like peak is observed at around 3 T, which is caused perhaps by some spin
flip transition.Comment: 5 pages, 4 figure
Generalized hidden symmetries and the Kerr-Sen black hole
We elaborate on basic properties of generalized Killing-Yano tensors which
naturally extend Killing-Yano symmetry in the presence of skew-symmetric
torsion. In particular, we discuss their relationship to Killing tensors and
the separability of various field equations. We further demonstrate that the
Kerr-Sen black hole spacetime of heterotic string theory, as well as its
generalization to all dimensions, possesses a generalized closed conformal
Killing-Yano 2-form with respect to a torsion identified with the 3-form
occuring naturally in the theory. Such a 2-form is responsible for complete
integrability of geodesic motion as well as for separability of the scalar and
Dirac equations in these spacetimes.Comment: 33 pages, no figure
Exotic mesons with hidden charm and bottom near thresholds
We study heavy hadron spectroscopy near heavy meson thresholds. We employ
heavy pseudoscalar meson P and heavy vector meson P* as effective degrees of
freedom and consider meson exchange potentials between them. All possible
composite states which can be constructed from the P and P* mesons are studied
up to the total angular momentum J <= 2. We consider, as exotic states,
isosinglet states with exotic J^{PC} quantum numbers and isotriplet states. We
solve numerically the Schr\"odinger equation with channel-couplings for each
state. We found B(*)barB(*) molecule states for I^G(J^{PC}) = 1^+(1^{+-})
correspond to the masses of twin resonances Zb(10610) and Zb(10650). We predict
several possible B(*)barB(*) bound and/or resonant states in other channels. On
the other hand, there are no B(*)barB(*) bound and/or resonant states whose
quantum numbers are exotic.Comment: 10 pages, 1 figure, to appear in the proceedings of The 5th
International Workshop on Charm Physics (Charm 2012
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