9,617 research outputs found
Analyzing eta' photoproduction data on the proton at energies of 1.5--2.3 GeV
The recent high-precision data for the reaction at
photon energies in the range 1.5--2.3 GeV obtained by the CLAS collaboration at
the Jefferson Laboratory have been analyzed within an extended version of the
photoproduction model developed previously by the authors based on a
relativistic meson-exchange model of hadronic interactions [Phys. Rev. C
\textbf{69}, 065212 (2004)]. The photoproduction can be described quite
well over the entire energy range of available data by considering ,
, , and resonances, in addition to the -channel
mesonic currents. The observed angular distribution is due to the interference
between the -channel and the nucleon - and -channel resonance
contributions. The resonances are required to reproduce some of the
details of the measured angular distribution. For the resonances considered,
our analysis yields mass values compatible with those advocated by the Particle
Data Group. We emphasize, however, that cross-section data alone are unable to
pin down the resonance parameters and it is shown that the beam and/or target
asymmetries impose more stringent constraints on these parameter values. It is
found that the nucleonic current is relatively small and that the
coupling constant is not expected to be much larger than 2.Comment: Revised version based on revised (finalized) CLAS data (14 pages, 10
figures, RevTeX4
Higgs mass and muon anomalous magnetic moment in the U(1) extended MSSM
We study phenomenological aspects of the MSSM with extra U(1) gauge symmetry.
We find that the lightest Higgs boson mass can be increased up to 125 GeV,
without introducing a large SUSY scale or large A-terms, in the frameworks of
the CMSSM and gauge mediated SUSY breaking (GMSB) models. This scenario can
simultaneously explain the discrepancy of the muon anomalous magnetic moment
(muon g-2) at the 1 sigma level, in both of the frameworks, U(1)-extended
CMSSM/GMSB models. In the CMSSM case, the dark matter abundance can also be
explained.Comment: 19 pages, 3 figures; submitted versio
Universal time-dependent deformations of Schrodinger geometry
We investigate universal time-dependent exact deformations of Schrodinger
geometry. We present 1) scale invariant but non-conformal deformation, 2)
non-conformal but scale invariant deformation, and 3) both scale and conformal
invariant deformation. All these solutions are universal in the sense that we
could embed them in any supergravity constructions of the Schrodinger invariant
geometry. We give a field theory interpretation of our time-dependent
solutions. In particular, we argue that any time-dependent chemical potential
can be treated exactly in our gravity dual approach.Comment: 24 pages, v2: references adde
Length of Cloud Application Use on Functionality Expectation, Usability, Privacy, and Security: A Case of Google Docs
Background: Newcomers to cloud applications typically have to overcome concerns of privacy (confidentiality control) and security (safekeeping). On the one hand, end-users may be accustomed to cloud applications’ privacy and security (habituation). On the other hand, these applications quickly adapt to end-user needs on those concerns (reciprocal habituation). Does the old proverb “Custom makes all things easy” apply to privacy and security concerns about cloud application use?
Method: This study focuses on Google Docs as an example of standardized, common cloud applications and collects data from 211 of its users.
Results: The results show that length of use has significant associations with better usability perception and increased functionality expectation. In turn, improved usability perception leads to decreased security risk concern, while increased functionality expectation increases privacy concerns. Interestingly, usefulness perception is not influenced by privacy concern.
Conclusions: Overall, the length of Google Docs use is associated with higher usefulness and increased adoption through greater usability and decreased security concern. Thus, when it comes to standardized, common cloud applications, the old proverb is valid with some exception. Also, “custom” is mutual between cloud applications and their users.
Available at: https://aisel.aisnet.org/pajais/vol11/iss3/2
Algebraic varieties with automorphism groups of maximal rank
We confirm, to some extent, the belief that a projective variety X has the
largest number (relative to the dimension of X) of independent commuting
automorphisms of positive entropy only when X is birational to a complex torus
or a quotient of a torus. We also include an addendum to an early paper though
it is not used in the present paper.Comment: Mathematische Annalen (to appear
Spin observables and the determination of the parity of in photoproduction reactions
Spin observables in the photoproduction of the are explored for
the purpose of determining the parity of the . Based on reflection
symmetry in the scattering plane, we show that certain spin observables in the
photoproduction of the can be related directly to its parity. We
also show that measurements of both the target nucleon asymmetry and the polarization may be useful in determining the parity of in
a model-independent way. Furthermore, we show that no combination of spin
observables involving only the polarization of the photon and/or nucleon in the
initial state can determine the parity of unambiguously.Comment: LaTeX, 11 pages, minor revisio
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