3,532 research outputs found
Advanced LSTM: A Study about Better Time Dependency Modeling in Emotion Recognition
Long short-term memory (LSTM) is normally used in recurrent neural network
(RNN) as basic recurrent unit. However,conventional LSTM assumes that the state
at current time step depends on previous time step. This assumption constraints
the time dependency modeling capability. In this study, we propose a new
variation of LSTM, advanced LSTM (A-LSTM), for better temporal context
modeling. We employ A-LSTM in weighted pooling RNN for emotion recognition. The
A-LSTM outperforms the conventional LSTM by 5.5% relatively. The A-LSTM based
weighted pooling RNN can also complement the state-of-the-art emotion
classification framework. This shows the advantage of A-LSTM
The longitudinal and transverse distributions of the pion wavefunction from the present experimental data on the pion-photon transition form factor
It is noted that the low-energy behavior of the pion-photon transition form
factor is sensitive to the transverse distribution of the
pion wavefunction, and its high-energy behavior is sensitive to the
longitudinal one. Thus a careful study on can provide
helpful information on the pion wavefunction precisely. In this paper, we
present a combined analysis of the data on reported by the
CELLO, the CLEO, the BABAR and the BELLE collaborations. It is performed by
using the method of least squares. By using the combined measurements of BELLE
and CLEO Collaborations, the pion wavefunction longitudinal and transverse
behavior can be fixed to a certain degree, i.e. we obtain and for ,
where and are two parameters of a convenient pion wavefunction
model whose distribution amplitude can mimic the various longitudinal behavior
under proper choice of parameters. We observe that the CELLO, CLEO and BELLE
data are consistent with each other, all of which prefers the asymptotic-like
distribution amplitude; while the BABAR data prefers a more broad distribution
amplitude, such as the CZ-like one.Comment: 7 pages, 10 figure
Analysis of the pentaquark states in the diquark model with QCD sum rules
In this article, we present the scalar-diquark-scalar-diquark-antiquark type
and scalar-diquark-axialvector-diquark-antiquark type pentaquark configurations
in the diquark model, and study the masses and pole residues of the
hidden-charmed pentaquark states in details with the
QCD sum rules by extending our previous work on the and
hidden-charmed pentaquark states. We calculate the
contributions of the vacuum condensates up to dimension-10 in the operator
product expansion by constructing both the
scalar-diquark-scalar-diquark-antiquark type and
scalar-diquark-axialvector-diquark-antiquark type interpolating currents. The
present predictions of the masses can be confronted to the LHCb experimental
data in the future.Comment: 20 pages, 17 figures. arXiv admin note: substantial text overlap with
arXiv:1508.0146
Possible assignments of the , and as axial-vector molecular states
In this article, we construct both the color singlet-singlet type and
octet-octet type currents to interpolate the , ,
, and calculate the vacuum condensates up to dimension-10 in the
operator product expansion. Then we study the axial-vector hidden charmed and
hidden bottom molecular states with the QCD sum rules, explore the energy scale
dependence of the QCD sum rules for the heavy molecular states in details, and
use the formula with the effective
masses to determine the energy scales. The numerical results
support assigning the , , as the color
singlet-singlet type molecular states with , , ,
respectively, more theoretical and experimental works are still needed to
distinguish the molecule and tetraquark assignments; while there are no
candidates for the color octet-octet type molecular states.Comment: 20 pages, 20 figures, add detailed discussions. arXiv admin note:
substantial text overlap with arXiv:1310.2422, arXiv:1312.2652,
arXiv:1312.1537, arXiv:1311.104
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