Journals
2016 EN
B. P. Singh · W. Erni · B. Krusche
+501 more
. Simulation results for future measurements of electromagnetic proton form factors at PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel ¯pp → e+e − is studied on the basis of two different but consistent procedures. The suppression of the main background channel, i.e. ¯pp → π+π−, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance
Springer Science+Business Media
Book Series
2016 EN
M. A. Vasiliev
General aspects of higher-spin gauge theory and unfolded formulation arebriefly recalled with some emphasize on the recent results on the breaking of$sp(8)$ symmetry by current interactions and construction of invariantfunctionals relevant to the higher-spin holography.
Book Series
2016 EN
Cesar Arias · Roberto Bonezzi · Nicolas Boulanger
+4 more
We review various off-shell formulations for interacting higher-spin systemsin dimensions 3 and 4. Associated with higher-spin systems in spacetimedimension 4 is a Chern-Simons action for a superconnection taking its values ina direct product of an infinite-dimensional algebra of oscillators and aFrobenius algebra. A crucial ingredient of the model is that it elevates therigid closed and central two-form of Vasiliev's theory to a dynamical 2-formand doubles the higher-spin algebra, thereby considerably reducing the numberof possible higher spin invariants and giving a nonzero effective functionalon-shell. The two action principles we give for higher-spin systems in 3D arebased on Chern-Simons and BF models. In the first case, the theory we giveunifies higher-spin gauge fields with fractional-spin fields and an internalsector. In particular, Newton's constant is related to the coupling constant ofthe internal sector. In the second case, the BF action we review gives thefully nonlinear Prokushkin-Vasiliev, bosonic equations for matter-coupledhigher spins in 3D. We present the truncation to a single, real matter fieldrelevant in the Gaberdiel-Gopakumar holographic duality. The link between thevarious actions we present is the fact that they all borrow ingredients fromTopological Field Theory. It has bee conjectured that there is an underlyingand unifying 2-dimensional first-quantised description of the previoushigher-spin models in 3D and 4D, in the form of a Cattaneo-Felder-liketopological action containing fermionic fields.
Conference Proceedings
2016 EN
Simone Giombi
In these lectures we give an overview of the duality between gravitational theories of massless higher spin fields in AdS and large N vector models. We first review the original higher spin/vector model duality conjectured by Klebanov and Polyakov, and then discuss its generalizations involving vector models coupled to Chern-Simons gauge fields. We proceed to review some aspects of the theory of massless higher spins, starting with the Fronsdal equations for free fields and moving on to the fully non-linear Vasiliev equations in four dimensions. We end by reviewing some recent tests of the higher spin/vector model duality at the level of correlation functions and one-loop partition functions.
Journals
2016 EN
V. P. Ladygin · I. Dobrin · V. V. Fimushkin
+44 more
Recent results on spin effects in few nucleon systems obtained at Nuclotron-JINR are presented. The data on the deuteron analyzing powers in different reactions in the wide energy range demonstrate the sensitivity to the short-range spin structure of the light nuclei. The future plans on the studies with polarized deuterons from new polarized ion source at Nuclotron will be reported.
Journals
2016 EN
P. A. Semenov · A. A. Bogdanov · S. Bukreeva
+14 more
A beam channel of polarized protons and antiprotons produced from decays of [Formula: see text]- and anti-[Formula: see text]-hyperons for the SPASCHARM experiment is to be built at IHEP U-70 accelerator in Protvino, Russia. The methods for tagging and measuring polarization of the beam (anti)protons are discussed in this report. The fast on-line beam tagging exploits the correlations between polarization and kinematics of (anti)protons originated from (anti)[Formula: see text]-decays. In the intermediate focus of primary target, decay (anti)protons of different transverse polarizations are spatially dispersed transversely with respect to the beam axis. The tagging system, consisting of fast beam detectors with good spatial resolution, measures the momentum and trajectory of each beam particle, including its position at the intermediate focus, thus allowing instant (on-line) assignment of the transverse polarization value to each (anti)proton. This system is also extremely useful for the beam channel tuning. While being fast and convenient, the polarization tagging fully relies on computing of particle transportation in the beam channel. In order to verify the real beam polarization and operating of the tagging system and beam channel, the independent absolute beam polarimetry is to be used. It is based on measuring the spin asymmetries in elastic scattering of beam (anti)protons in Coulomb-Nuclear Interference (CNI) and diffractive kinematic regions. It is estimated that less than one week of data taking would allow measuring an absolute beam polarization at the statistical accuracy of [Formula: see text]4–5%.
Journals
2016 EN
В. В. Мочалов · V. Abramov · N. A. Bazhanov
+14 more
A new experiment SPASCHARM for systematic study of polarization phenomena in the inclusive and exclusive hadronic reactions in the energy range of IHEP accelerator U-70 (12–50[Formula: see text]GeV) is currently under development. The universal experimental setup will detect dozens of various resonances and stable particles produced in collisions of unpolarized beams with the polarized target, and at the next stage, using polarized proton and antiproton beams. At the beginning, the final states consisting of light quarks ([Formula: see text], [Formula: see text], [Formula: see text]) will be reconstructed, and later on the charmonium states will be studied. Measurements are planned for a variety of beams: [Formula: see text], antiprotons. Hyperon polarization and spin density matrix elements of the vector mesons will be measured along with the single-spin asymmetry (SSA). The 2[Formula: see text]-acceptance in azimuth, which is extremely useful for reduction of systematic errors in measurements of spin observables, will be implemented in the experiment. The solid angle acceptance of the setup, [Formula: see text] mrad vertically and 350 mrad horizontally in the beam fragmentation region, covers a wide range of kinematic variables [Formula: see text] and [Formula: see text]. This provides the opportunity for separating dependences on these two variables which is usually not possible in the setups with a small solid angle acceptance. Unlike some previous polarization experiments, the SPASCHARM will be able to simultaneously accumulate and record data on the both, charged and neutral particle production.
Journals
2016 EN
P. R. Butovskaya · O. E. Lazebny · E. M. Sukhodolskaya
+7 more
Background The oxytocin (OT) system is known to be implicated in the regulation of complex social behavior, particularly empathy and parenting. The goal of this study was to estimate the gender and population differences in polymorphisms of two oxytocin receptor gene SNPs, rs53576 and rs2254298, in four populations. Results These data were compared with each other and with 14 samples from the corresponding regions retrieved from the 1000 Genomes database. Low level of heterozygosity was observed for both SNPs in all populations in this study (rs53576: Catalonian, Hobs = 0.413; Hadza, Hobs = 0.556; sr2254698: Khanty-Mansi, Hobs = 0.250; Datoga, Hobs = 0.550). The amount of variance due to regional variability was almost equal for both SNPs (rs53576: F RT = 0.086, rs2554298: F RT = 0.072), whereas variance for the population level of variability was twice bigger for rs2554298 (rs53576: F ST = 0.127, rs2554298: F ST = 0.162). Pairwise coefficients of fixation demonstrate that the Hadza were well differentiated from other African populations except of Datoga, the Datoga were weakly differentiated from other African origin populations, the Ob Ugric people were extremely differentiated from all other populations. Catalans were extremely differentiated of Asian populations. Conclusions It is hypothesized on the base of spatial distribution of the evolutionary novel A alleles of the both OXTR gene loci, that the spread of alleles of rs22542298 and rs53376 SNPs may be associated to some extant with manipulation of parental investment in humans. Electronic supplementary material The online version of this article (doi:10.1186/s12863-015-0323-8) contains supplementary material, which is available to authorized users.
Journals
2016 EN
Н. А. Шмаков · Gennadiy V. Vasiliev · Natalya Shatskaya
+4 more
Background Albinism in plants is characterized by lack of chlorophyll and results in photosynthesis impairment, abnormal plant development and premature death. These abnormalities are frequently encountered in interspecific crosses and tissue culture experiments. Analysis of albino mutant phenotypes with full or partial chlorophyll deficiency can shed light on genetic determinants and molecular mechanisms of albinism. Here we report analysis of RNA-seq transcription profiling of barley ( Hordeum vulgare L.) near-isogenic lines, one of which is a carrier of mutant allele of the Alm gene for albino lemma and pericarp phenotype (line i:Bw Alm ). Results 1221 genome fragments have statistically significant changes in expression levels between lines i:Bw Alm and Bowman, with 148 fragments having increased expression levels in line i:Bw Alm , and 1073 genome fragments, including 42 plastid operons, having decreased levels of expression in line i:Bw Alm . We detected functional dissimilarity between genes with higher and lower levels of expression in i:Bw Alm line. Genes with lower level of expression in the i:Bw Alm line are mostly associated with photosynthesis and chlorophyll synthesis, while genes with higher expression level are functionally associated with vesicle transport. Differentially expressed genes are shown to be involved in several metabolic pathways; the largest fraction of such genes was observed for the Calvin-Benson-Bassham cycle. Finally, de novo assembly of transcriptome contains several transcripts, not annotated in current H. vulgare genome version. Conclusions Our results provide the new information about genes which could be involved in formation of albino lemma and pericarp phenotype. They demonstrate the interplay between nuclear and chloroplast genomes in this physiological process. Electronic supplementary material The online version of this article (doi:10.1186/s12870-016-0926-x) contains supplementary material, which is available to authorized users.
Journals
2016 EN
T. Velasquez · Gina Mackey · J. Lusk
+2153 more
A793 Malnutrition and clinical outcomes in critically ill children T. Velasquez, G. Mackey, J. Lusk, U.G. Kyle, T. Fontenot, P. Marshall, L.S. Shekerdemian, J.A. Coss-Bu Texas Children's Hospital, Clinical Nutriiton, Houston, United States; Texas Children's Hospital, Intensive Care, Houston, United States; Baylor College of Medicine, Pediatrics, Houston, United States Correspondence: J.A. Coss-Bu – Texas Children's Hospital, Intensive Care, Houston, United States Intensive Care Medicine Experimental 2016, 4(Suppl 1):A793