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42 papers · 1 filter
X-ray Spectral Characteristics of Ginga Gamma-Ray Bursts
T. E. Strohmayer, E. E. Fenimore, T. Murakami +1
The proportional counter and scintillator on Ginga provided unprecented spectral coverage of GRBs, from 2 - 400 keV. Below 20 keV we find evidence for a positive spectral number in…
X-ray Spectral Properties of Gamma-Ray Bursts
T. E. Strohmayer, E. E. Fenimore, T. Murakami +1
We summarize the spectral characteristics of a sample of 22 bright gamma-ray bursts detected with the gamma-ray burst sensors aboard the satellite Ginga. This instrument employed a…
ASCA detection of the FeK edge in the spectrum of the Seyfert 2 galaxy IRAS 04575-7537: a sign of a complex absorber
C. Vignali, A. Comastri, G. M. Stirpe +5
ASCA X-ray spectral analysis of the Seyfert 2 galaxy IRAS 04575-7537 is presented. The main result is the presence of a significant iron edge at a rest energy of 7.13^+0.21_-0.16 k…
Isospin Splittings of Baryons
K. Varga, M. Genovese, J. -M. Richard +1
We discuss the isospin-breaking mass differences among baryons, with particular attention in the charm sector to the , , and splittings…
Non-spectator contributions to B->X_s eta'
M. R. Ahmady, E. Kou, A. Sugamoto
We propose a nonspectator mechanism in which eta' is produced by two gluon fusion as the underlying process to explain the inclusive B-> X_s eta' as well as the exclusive B -> K^(*…
Renormalization of the Twist-3 Flavor Singlet Operators in a Covariant Gauge
Jiro Kodaira, Takashi Nasuno, Hiroshi Tochimura +2
We investigate the nucleon's transverse spin-dependent structure function g_2(x, Q^2) in the framework of the operator product expansion and the renormalization group. We construct…