The photon energy spectrum in inclusive weak radiative B̄ → Xsγ decay is computed to order αsβ0. This result is used to extract a value for the HQET parameter Λ̄ from the average 〈1 − 2Eγ/mB〉, and a value of the parameter λ1 from 〈(1 − 2Eγ/mB)〉. An accurate measurement of 〈1 − 2Eγ/mB〉 can determine the size of the nonperturbative contributions to the Υ(1S) mass which cannot be absorbed into the b...

The Kaluza-Klein spectrum of N=2, D=4 supergravity compactified on AdS2×S is found and shown to consist of two infinite towers of SU(1, 1|2) representations. In addition to ‘pure gauge’ modes living on the boundary of AdS which are familiar from higher dimensional cases, in two dimensions there are modes (e.g. massive gravitons) which enjoy no gauge symmetry yet nevertheless have no on-shell de...

background and objectives: the emergence of extended-spectrum β-lactamase (esbl)-producing shigella spp.  is of increasing clinical concern specially in children worldwide. the aim of this study was to investigate the occurrence of extended-spectrum β-lactamase producing shigella spp. in tehran, iran. materials and methods: the study included all shigella isolates recovered from pediatric patie...

there are many different ways to subdivide the spectrum of a bounded linear operator; some of them aremotivated by applications to physics (in particular, quantum mechanics). in this study, the relationship betweenthe subdivisions of spectrum which are not required to be disjoint and goldberg's classification are given.moreover, these subdivisions for some summability methods are studied.

We study the numerical range of bounded linear operators on quaternionic Hilbert spaces and its relation with S-spectrum. The class complex is introduced upper bild normal completely characterized in this setting.