442 research outputs found
Spin Sum Rules and the Strong Coupling Constant at large distance
We present recent results on the Bjorken and the generalized forward spin
polarizability sum rules from Jefferson Lab Hall A and CLAS experiments,
focusing on the low part of the measurements. We then discuss the
comparison of these results with Chiral Perturbation theory calculations. In
the second part of this paper, we show how the Bjorken sum rule with its
connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define
an effective coupling for the strong force at all distances.Comment: Contribution to proceedings for the Workshop on Spin Structure at
Long Distance (Newport News, March 2009
Electron microscopic studies on the palpi of Cybister fimbriolatus fimbriolatus (Say)
The maxillary palpi of the predaceous diving beetle Cybister fimbriolatus fimbriolatus Say were observed by transmission and scanning electron microscopy. Scanning electron microscopy shows at least two types of sensilla at the tip of palp, which are referred to as “circumvallate and naked sensilla”. The former are innervated with outer segments of distal processes of sensory cells, but the latter are provided only with chitin and cuticular substances.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47659/1/441_2004_Article_BF00330709.pd
Measurement of the Q(2) Dependence of the Deuteron Spin Structure Function g(1) and Its Moments at Low Q(2) with CLAS
We measured the g1 spin structure function of the deuteron at low Q2, where QCD can be approximated with chiral perturbation theory (χPT). The data cover the resonance region, up to an invariant mass of W ≈ 1.9 GeV. The generalized Gerasimov-Drell-Hearn sum, the moment Γd1 and the spin polarizability γ0d are precisely determined down to a minimum Q2 of 0.02 GeV2 for the first time, about 2.5 times lower than that of previous data. We compare them to several χPT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the χPT domain.
We measured the g1 spin structure function of the deuteron at low Q2, where QCD can be approximated with chiral perturbation theory (χPT). The data cover the resonance region, up to an invariant mass of W ≈1.9 GeV. The generalized Gerasimov-Drell-Hearn sum, the moment Γ_{1}^{d} and the spin polarizability γ_{0}^{d} are precisely determined down to a minimum Q2 of 0.02 GeV2 for the first time, about 2.5 times lower than that of previous data. We compare them to several χPT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the χPT domain
Experimental determination of the evolution of the Bjorken integral at low Q^2
We extract the Bjorken integral Gamma^{p-n}_1 in the range 0.17 < Q^2 < 1.10
GeV^2 from inclusive scattering of polarized electrons by polarized protons,
deuterons and 3He, for the region in which the integral is dominated by nucleon
resonances. These data bridge the domains of the hadronic and partonic
descriptions of the nucleon. In combination with earlier measurements at higher
Q^2, we extract the non-singlet twist-4 matrix element f_2.Comment: Quoted world data updated. Minor change in some results, Minor
rephrasin
Cerebral expression of metabotropic glutamate receptor subtype 5 in idiopathic autism spectrum disorder and fragile X syndrome: A pilot study
Multiple lines of evidence suggest that dysfunction of the metabotropic glutamate receptor subtype 5 (mGlu
Precision Measurement of the Neutron Spin Asymmetry and Spin-Flavor Decomposition in the Valence Quark Region
We have measured the neutron spin asymmetry with high precision at
three kinematics in the deep inelastic region at , 0.47 and 0.60, and
, 3.5 and 4.8 (GeV/c), respectively. Our results unambiguously
show, for the first time, that crosses zero around and becomes
significantly positive at . Combined with the world proton data,
polarized quark distributions were extracted. Our results, in general, agree
with relativistic constituent quark models and with perturbative quantum
chromodynamics (pQCD) analyses based on the earlier data. However they deviate
from pQCD predictions based on hadron helicity conservation.Comment: 5 pages, 2 figures, this is the final version appeared in Phys. Rev.
Let
Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region
We report on measurements of the neutron spin asymmetries and
polarized structure functions at three kinematics in the deep
inelastic region, with , 0.47 and 0.60 and , 3.5 and 4.8
(GeV/c), respectively. These measurements were performed using a 5.7 GeV
longitudinally-polarized electron beam and a polarized He target. The
results for and at are consistent with previous world
data and, at the two higher points, have improved the precision of the
world data by about an order of magnitude. The new data show a zero
crossing around and the value at is significantly positive.
These results agree with a next-to-leading order QCD analysis of previous world
data. The trend of data at high agrees with constituent quark model
predictions but disagrees with that from leading-order perturbative QCD (pQCD)
assuming hadron helicity conservation. Results for and have a
precision comparable to the best world data in this kinematic region. Combined
with previous world data, the moment was evaluated and the new result
has improved the precision of this quantity by about a factor of two. When
combined with the world proton data, polarized quark distribution functions
were extracted from the new values based on the quark parton
model. While results for agree well with predictions from various
models, results for disagree with the leading-order pQCD
prediction when hadron helicity conservation is imposed.Comment: A typing error in A_\parallel(3He) at x=0.47 in Table VII of Phys.
Rev. C has been noticed and correcte
Scaling of the F_2 structure function in nuclei and quark distributions at x>1
We present new data on electron scattering from a range of nuclei taken in
Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the
cross section for , which is sensitive to short range contributions to the
nuclear wave-function, and in deep inelastic scattering corresponds to probing
extremely high momentum quarks. This result agrees with higher energy muon
scattering measurements, but is in sharp contrast to neutrino scattering
measurements which suggested a dramatic enhancement in the distribution of the
`super-fast' quarks probed at x>1. The falloff at x>1 is noticeably stronger in
^2H and ^3He, but nearly identical for all heavier nuclei.Comment: 5 pages, 4 figures, to be submitted to physical revie
Reduced expression of cerebral metabotropic glutamate receptor subtype 5 in men with fragile X syndrome
Glutamatergic receptor expression is mostly unknown in adults with fragile X syndrome (FXS). Favorable behavioral effects of negative allosteric modulators (NAMs) of the metabotropic glutamate receptor subtype 5 (mGlu
Measurement of the 12C(e,e'p)11B Two-Body Breakup Reaction at High Missing Momentum Values
The five-fold differential cross section for the 12C(e,e'p)11B reaction was
determined over a missing momentum range of 200-400 MeV/c, in a kinematics
regime with Bjorken x > 1 and Q2 = 2.0 (GeV/c)2. A comparison of the results
and theoretical models and previous lower missing momentum data is shown. The
theoretical calculations agree well with the data up to a missing momentum
value of 325 MeV/c and then diverge for larger missing momenta. The extracted
distorted momentum distribution is shown to be consistent with previous data
and extends the range of available data up to 400 MeV/c.Comment: 12 pages, 1 table and 3 figures for submission to Journal Physics
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