13,342 research outputs found
Mass Dependence of Higgs Production at Large Transverse Momentum
The transverse momentum distribution of the Higgs at large is
complicated by its dependence on three important energy scales: , the top
quark mass , and the Higgs mass . A strategy for simplifying the
calculation of the cross section at large is to calculate only the
leading terms in its expansion in and/or . The
expansion of the cross section in inverse powers of is complicated by
logarithms of and by mass singularities. In this paper, we consider the
top-quark loop contribution to the subprocess at leading
order in . We show that the leading power of can be
expressed in the form of a factorization formula that separates the large scale
from the scale of the masses. All the dependence on and can
be factorized into a distribution amplitude for in the Higgs, a
distribution amplitude for in a real gluon, and an endpoint
contribution. The factorization formula can be used to simplify calculations of
the distribution at large to next-to-leading order in .Comment: 49 pages, 8 figure
Large Magnetoresistance over an Extended Temperature Regime in Monophosphides of Tantalum and Niobium
We report extremely large magnetoresistance (MR) in an extended temperature
regime from 1.5 K to 300 K in non-magnetic binary compounds TaP and NbP. TaP
exhibits linear MR around at 2 K in a magnetic field of 9
Tesla, which further follows its linearity up to in a magnetic
field of 56 Tesla at 1.5 K. At room temperature the MR for TaP and NbP follows
a power law of the exponent about with the values larger than in
a magnetic field of 9 Tesla. Such large MR in a wide temperature regime is not
likely only due to a resonance of the electron-hole balance, but indicates a
complicated mechanism underneath.Comment: 13 pages, 4 figures; submitted in May 20, 2015; accepted for
publicatio
Relationship between single-nucleotide polymorphisms in un-translated region of human leukocyte antigen-G and preeclampsia
Purpose: The aim of this study was to unravel the link between human leukocyte antigen-G untranslated region (HLA-G 3-UTR) single-nucleotide polymorphism (SNP) and preeclampsia by examining polymorphisms in HLA-G 3-UTR in preeclampsia patients and their newborns, as well as those of women with normal pregnancy and their newborns.Methods: Single pregnant mothers and their newborns at the Third Affiliated Hospital of Zhengzhou University, China, were divided into preeclampsia group (144 cases), and normal pregnancy group (122 cases). Blood samples from the two groups were collected for DNA extraction, and the DNA samples were analyzed for HLA-G 3'-UTR SNP by polymerase chain reaction (RT-PCR) and direct sequencing method.Results: The frequency of CG genotype in HLA-G 3-UTR 3127 gene in the preeclampsia group was significantly lower, while the frequency of AA genotype in HLA-G 3-UTR 3172 gene in the preeclampsia group was significantly higher (p < 0.05) when compared with the normal pregnancy group. Furthermore, frequencies of the compatible genotype AA/AA (mothers/newborns) in HLA-G 3-UTR 3172 gene in the preeclampsia group were significantly higher relative to the normal pregnancy group (p< 0.05).Conclusion: These results suggest that when CC/GG is the compatible genotype in HLA-G 3-UTR 3127 gene of mothers/newborns, preeclampsia risk may decrease, but it may increase if the compatible genotype is AA/AA. Thus, SNP in HLA-G 3-UTR 3127 gene may be a protective factor against preeclampsia in Chinese Han pregnant women, while SNP in 3172 gene may be associated with susceptibility to preeclampsia.Keywords: Single-nucleotide polymorphisms, Human leukocyte antigen-G, Un-translated Region, Preeclampsi
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