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93 papers · 1 filter
Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
B. Thielemann, Ch. Rüegg, H. M. Rønnow +12
We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)2CuBr4. Discrete magnon m…
Precise Measurement of pi+ -> e+ nu Branching Ratio
E. Frlež, L. P. Alonzi, V. A. Baranov +23
The PEN Collaboration is conducting a new measurement of the pi+ -> e+ nu branching ratio at the Paul Scherrer Institute, with the goal uncertainty of delta B/B(pie2)=5E-4 or lower…
MSSM Higgs Boson Production via Gluon Fusion: The Large Gluino Mass Limit
Margarete Mühlleitner, Heidi Rzehak, Michael Spira
Scalar MSSM Higgs boson production via gluon fusion gg -> h,H is mediated by heavy quark and squark loops. The higher order QCD corrections to these processes turn out to be large.…
Direct observation of charge order and orbital glass state in multiferroic LuFe2O4
A. M. Mulders, S. M. Lawrence, U. Staub +6
Geometrical frustration of the Fe ions in LuFe2O4 leads to intricate charge and magnetic order and a strong magnetoelectric coupling. Using resonant x-ray diffraction at the Fe K e…
The Fractional Quantum Hall state at nu=5/2 and the Moore-Read Pfaffian
M. Storni, R. H. Morf, S. Das Sarma
Results from exact diagonalization show that the spin-polarized Coulomb ground state at nu=5/2 is adiabatically connected with the Moore-Read wave function for systems with up to N…
Probing Quark-Gluon Interactions with Transverse Polarized Scattering
K. Slifer, O. A. Rondon, A. Aghalaryan +69
We have extracted QCD matrix elements from our data on double polarized inelastic scattering of electrons on nuclei. We find the higher twist matrix element \tilde{d_2}, which aris…