5,838 research outputs found
The anomalous couplings at the HERA and EIC
To resolve the long-standing discrepancy between the precision measurement of
bottom quark forward-backward asymmetry at LEP/SLC and the Standard Model
prediction, we propose a novel method to probe the coupling by
measuring the single-spin asymmetry of the polarized lepton cross
section in neutral current DIS processes with a -tagged jet at HERA and EIC.
Depending on the tagging efficiency of the final state -jet, the measurement
of at HERA can already partially break the degeneracy found in the
anomalous coupling, as implied by the LEP and SLC precision
electroweak data. In the first year run of the EIC, the measurement of
can already break the degeneracy, due to its much larger luminosity and higher
electron beam polarization. With enough integrated luminosity collected at the
EIC, it is possible to either verify or exclude the LEP data and resolve the
puzzle. We also discuss the complementary roles between the
proposed measurement at EIC and the measurement of cross
section at the HL-LHC in constraining the anomalous coupling.Comment: 6 pages, 2 figures, the published version in PL
Single Transverse Spin Asymmetry as a New Probe of SMEFT Dipole Operators
Electroweak dipole operators in the Standard Model Effective Field Theory
(SMEFT) are important indirect probes of quantum effects of new physics beyond
the Standard Model (SM), yet they remain poorly constrained by current
experimental analyses for lack of interference with the SM amplitudes in
constructing cross section observables. In this Letter, we point out that
dipole operators flip fermion helicities so are ideally studied through single
transverse spin asymmetries. We illustrate this at a future electron-positron
collider with transversely polarized beams, where such effect exhibits as
azimuthal and distributions which originate from the
interference of the electron dipole operators with the SM and are linearly
dependent on their Wilson coefficients. This new method can improve the current
constraints on the electron dipole couplings by one to two orders of magnitude,
without depending on other new physics operators, and can also simultaneously
constrain both their real and imaginary parts, offering a new opportunity for
probing potential -violating effects.Comment: 5 pages, 1 figur
Alternating minimization algorithms for graph regularized tensor completion
We consider a low-rank tensor completion (LRTC) problem which aims to recover
a tensor from incomplete observations. LRTC plays an important role in many
applications such as signal processing, computer vision, machine learning, and
neuroscience. A widely used approach is to combine the tensor completion data
fitting term with a regularizer based on a convex relaxation of the multilinear
ranks of the tensor. For the data fitting function, we model the tensor
variable by using the Canonical Polyadic (CP) decomposition and for the
low-rank promoting regularization function, we consider a graph Laplacian-based
function which exploits correlations between the rows of the matrix unfoldings.
For solving our LRTC model, we propose an efficient alternating minimization
algorithm. Furthermore, based on the Kurdyka-{\L}ojasiewicz property, we show
that the sequence generated by the proposed algorithm globally converges to a
critical point of the objective function. Besides, an alternating direction
method of multipliers algorithm is also developed for the LRTC model. Extensive
numerical experiments on synthetic and real data indicate that the proposed
algorithms are effective and efficient
Enhanced squeezing with parity kicks
Using exponential quadratic operators, we present a general framework for
studying the exact dynamics of system-bath interaction in which the Hamiltonian
is described by the quadratic form of bosonic operators. To demonstrate the
versatility of the approach, we study how the environment affects the squeezing
of quadrature components of the system. We further propose that the squeezing
can be enhanced when parity kicks are applied to the system.Comment: 4 pages, 2 figure
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Role for polo-like kinase 4 in mediation of cytokinesis.
The mitotic protein polo-like kinase 4 (PLK4) plays a critical role in centrosome duplication for cell division. By using immunofluorescence, we confirm that PLK4 is localized to centrosomes. In addition, we find that phospho-PLK4 (pPLK4) is cleaved and distributed to kinetochores (metaphase and anaphase), spindle midzone/cleavage furrow (anaphase and telophase), and midbody (cytokinesis) during cell division in immortalized epithelial cells as well as breast, ovarian, and colorectal cancer cells. The distribution of pPLK4 midzone/cleavage furrow and midbody positions pPLK4 to play a functional role in cytokinesis. Indeed, we found that inhibition of PLK4 kinase activity with a small-molecule inhibitor, CFI-400945, prevents translocation to the spindle midzone/cleavage furrow and prevents cellular abscission, leading to the generation of cells with polyploidy, increased numbers of duplicated centrosomes, and vulnerability to anaphase or mitotic catastrophe. The regulatory role of PLK4 in cytokinesis makes it a potential target for therapeutic intervention in appropriately selected cancers
Soliton with a Pion Field in the Global Color Symmetry Model
We calculate the property of the global color symmetry model soliton with the
pion field being included explicitly. The calculated results indicate that the
pion field provides a strong attraction so that the eigen-energy of a quark and
the mass of a soliton reduce drastically, in contrast to those with only the
sigma field.Comment: 15 pages, 2 figure
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