157 research outputs found
Model dependence of single-energy fits to pion photoproduction data
Model dependence of multipole analysis has been explored through
energy-dependent and single-energy fits to pion photoproduction data. The MAID
energy-dependent solution has been used as input for an event generator
producing realistic pseudo data. These were fitted using the SAID
parametrization approach to determine single-energy and energy-dependent
solutions over a range of lab photon energies from 200 to 1200 MeV. The
resulting solutions were found to be consistent with the input amplitudes from
MAID. Fits with a -squared per datum of unity or less were generally
achieved. We discuss energy regions where consistent results are expected, and
explore the sensitivity of fits to the number of included single- and
double-polarization observables. The influence of Watson's theorem is examined
in detail.Comment: 12 pages, 8 figure
Magnetic moments of the low-lying , resonances within the framework of the chiral quark model
The magnetic moments of the low-lying spin-parity ,
resonances, like, for example, ,
, as well as their transition magnetic moments, are
calculated using the chiral quark model. The results found are compared with
those obtained from the nonrelativistic quark model and those of unitary chiral
theories, where some of these states are generated through the dynamics of two
hadron coupled channels and their unitarization
Constraining the Detailed Balance Condition in Horava Gravity with Cosmic Accelerating Expansion
In 2009 Ho\v{r}ava proposed a power-counting renormalizable quantum gravity
theory. Afterwards a term in the action that softly violates the detailed
balance condition has been considered with the attempt of obtaining a more
realistic theory in its IR-limit. This term is proportional to , where is a constant parameter and is the spatial
Ricci scalar. In this paper we derive constraints on this IR-modified
Ho\v{r}ava theory using the late-time cosmic accelerating expansion
observations. We obtain a lower bound of that is nontrivial and
depends on , the cosmological constant of the three dimensional
spatial action in the Ho\v{r}ava gravity. We find that to preserve the detailed
balance condition, one needs to fine-tune such that - 2.29\times
10^{-4}< (c^2 \Lambda_W)/(H^2_0 \currentDE) - 2 < 0 , where and
\currentDE are the Hubble parameter and dark energy density fraction in the
present epoch, respectively. On the other hand, if we do not insist on the
detailed balance condition, then the valid region for is much
relaxed to -0.39< (c^2 \Lambda_W)/(H^2_0 \currentDE) - 2 < 0.12. We find that
although the detailed balance condition cannot be ruled out, it is strongly
disfavored.Comment: 22 pages with 7 figures, references adde
Chiral unitary approach to S-wave meson baryon scattering in the strangeness S=0 sector
We study the S-wave interaction of mesons with baryons in the strangeness S=0
sector in a coupled channel unitary approach. The basic dynamics is drawn from
the lowest order meson baryon chiral Lagrangians. Small modifications inspired
by models with explicit vector meson exchange in the t-channel are also
considered. In addition the pi pi N channel is included and shown to have an
important repercussion in the results, particularly in the isospin 3/2 sector.Comment: 23 pages, LaTeX, 21 figure
Charmless hadronic decays and new physics effects in the general two-Higgs doublet models
Based on the low-energy effective Hamiltonian with the generalized
factorization, we calculate the new physics contributions to the branching
ratios of the two-body charmless hadronic decays of and mesons
induced by the new gluonic and electroweak charged-Higgs penguin diagrams in
the general two-Higgs doublet models (models I, II and III). Within the
considered parameter space, we find that: (a) the new physics effects from new
gluonic penguin diagrams strongly dominate over those from the new -
and - penguin diagrams; (b) in models I and II, new physics contributions
to most studied B meson decay channels are rather small in size: from -15% to
20%; (c) in model III, however, the new physics enhancements to the
penguin-dominated decay modes can be significant, , and
therefore are measurable in forthcoming high precision B experiments; (d) the
new physics enhancements to ratios {\cal B}(B \to K \etap) are significant in
model III, , and hence provide a simple and plausible new
physics interpretation for the observed unexpectedly large B \to K \etap
decay rates; (e) the theoretical predictions for and
in model III are still consistent with the data
within errors; (f) the significant new physics enhancements to the
branching ratios of and decays are helpful to improve the
agreement between the data and the theoretical predictions; (g) the theoretical
predictions of in the 2HDM's are generally
consistent with experimental measurements and upper limits ()Comment: 55 pages, Latex file, 17 PS and EPS figures. With minor corrections,
final version to be published in Phys.Rev. D. Repot-no: PKU-TH-2000-4
P-wave excited baryons from pion- and photo-induced hyperon production
We report evidence for , , ,
, , and , and find
indications that might have a companion state at 1970\,MeV. The
controversial is not seen. The evidence is derived from a
study of data on pion- and photo-induced hyperon production, but other data are
included as well. Most of the resonances reported here were found in the
Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon (CM) analyses but were
challenged recently by the Data Analysis Center at GWU. Our analysis is
constrained by the energy independent scattering amplitudes from either
KH84 or GWU. The two amplitudes from KH84 or GWU, respectively, lead to
slightly different branching ratios of contributing resonances but the
debated resonances are required in both series of fits.Comment: 22 pages, 28 figures. Some additional sets of data are adde
Magnetic moments of the low-lying {1/2}^- octet baryon resonances
The magnetic moments of the negative parity octet resonances with spin {1/2}:
(1535), (1650), (1620), and (1690) have been
calculated within the framework of the chiral constituent quark model. In this
approach, the presence of the polarized pairs (or the meson cloud,
in other words) is considered by using the Lagrangian for Goldstone boson
emission from the constituent quarks. Further, the explicit contributions
coming from the spin and orbital angular momentum, including the effects of the
configurations mixing between the states with different spins, are obtained.
The motivation for these calculations comes from the recent interest in
experimental measurement of the magnetic moment of the
resonance and of similar calculations being done within lattice quantum
chromodynamics approaches. Our results can be compared with those expected to
come from these sources.Comment: 17 pages, 2 table
Tests of AMiBA Data Integrity
We describe methods used to validate data from the Y.T. Lee Array for
Microwave Background Anisotropy (AMiBA), an interferometric array designed to
measure the Sunyaev-Zel'dovich effect and the anisotropy of the Cosmic
Microwave Background (CMB). We perform several statistical tests on data from
pointed galaxy cluster observations taken in 2007 and noise data from long-term
blank sky observations and measurements with the feeds covered by the
absorbers. We apply power spectrum analysis, cross power spectrum analysis
among different outputs with different time lags in our analog correlator, and
sample variance law tests to noise data. We find that (1) there is no time
variation of electronic offsets on the time scale of our two-patch observations
(~10 minutes); (2) noise is correlated by less than 10% between different lags;
and (3) the variance of noise scales with the inverse of time. To test the
Gaussianity of the data, we apply Kolmogorov-Smirnov (K-S) tests to cluster
data, and find that a 5% significance level efficiently detects data sets with
known hardware problems without rejecting an excess of acceptable data. We also
calculate third- and fourth-order moments and cumulants for the noise residual
visibilities and find that about 95% of our data are within the 99% confidence
regions of Gaussianity.Comment: 15 pages, 5 figures, accepted for publication in Ap
AMiBA: System Performance
The Y.T. Lee Array for Microwave Background Anisotropy (AMiBA) started
scientific operation in early 2007. This work describes the optimization of the
system performance for the measurements of the Sunyaev-Zel'dovich effect for
six massive galaxy clusters at redshifts . We achieved a point
source sensitivity of mJy with the seven 0.6m dishes in 1 hour of
on-source integration in 2-patch differencing observations. We measured and
compensated for the delays between the antennas of our platform-mounted
interferometer. Beam switching was used to cancel instrumental instabilities
and ground pick up. Total power and phase stability were good on time scales of
hours, and the system was shown to integrate down on equivalent timescales of
300 hours per baseline/correlation, or about 10 hours for the entire array.
While the broadband correlator leads to good sensitivity, the small number of
lags in the correlator resulted in poorly measured bandpass response. We
corrected for this by using external calibrators (Jupiter and Saturn). Using
Jupiter as the flux standard, we measured the disk brightness temperature of
Saturn to be K.Comment: 9 pages, 7 figures, 1 table, accepted for publication in Ap
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