325,330 research outputs found
Cyclotron Resonance in the Layered Perovskite Superconductor Sr2RuO4
We have measured the cyclotron masses in Sr2RuO4 through the observation of
periodic-orbit-resonances - a magnetic resonance technique closely related to
cyclotron resonance. We obtain values for the alpha, beta and gamma Fermi
surfaces of (4.33+/-0.05)me, (5.81+/-0.03)me and (9.71+/-0.11)me respectively.
The appreciable differences between these results and those obtained from de
Haas- van Alphen measurements are attributable to strong electron-electron
interactions in this system. Our findings appear to be consistent with
predictions for a strongly interacting Fermi liquid; indeed, semi-quantitative
agreement is obtained for the electron pockets beta and gamma.Comment: 4 pages + 3 figure
SB30-21/22: Resolution Amending Section 4.33 of Personnel Policy
SB30-21/22: Resolution Amending Section 4.33 of Personnel Policy. This resolution passed unanimously during the October 20, 2021 meeting of the Associated Students of the University of Montana (ASUM)
Two-Loop Helicity Amplitudes for Gluon-Gluon Scattering in QCD and Supersymmetric Yang-Mills Theory
We present the two-loop helicity amplitudes for the scattering of two gluons
into two gluons in QCD, which are relevant for next-to-next-to-leading order
corrections to jet production at hadron colliders. We give the results in the
`t Hooft-Veltman and four-dimensional helicity variants of dimensional
regularization. Summing our expressions over helicities and colors, and
converting to conventional dimensional regularization, gives results in
complete agreement with those of Glover, Oleari and Tejeda-Yeomans. We also
present the amplitudes for 2 to 2 scattering in pure N=1 supersymmetric
Yang-Mills theory.Comment: 55 pages, 3 figures, corrected remark below eq. (4.33), other minor
changes, version appearing in JHE
Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma)
The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma
and Bs0 -> phi gamma has been measured using 0.37 fb-1 of pp collisions at a
centre of mass energy of sqrt(s) = 7 TeV, collected by the LHCb experiment. The
value obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.12 +/- 0.08
^{+0.06}_{-0.04} ^{+0.09}_{-0.08}, where the first uncertainty is statistical,
the second systematic and the third is associated to the ratio of fragmentation
fractions fs/fd. Using the world average for BR(B0 -> K*0 gamma) = (4.33 +/-
0.15) x 10^{-5}, the branching fraction BR(Bs0 -> phi gamma) is measured to be
(3.9 +/- 0.5) x 10^{-5}, which is the most precise measurement to date.Comment: 15 pages, 1 figure, 2 table
Dynamic skew measurements in 7, 19 and 22-core multi core fibers
We report simultaneous dynamic inter-core skew measurements between 7 cores of several homogeneous MCFs. The largest variation was 4.33 picoseconds for 31km span with diminishing influence of mechanical vibrations, temperature, core-layout and wavelength observed
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