A note on BRST quantization of SU(2) Yang-Mills mechanics

The quantization of SU(2) Yang-Mills theory reduced to 0+1 space-time dimensions is performed in the BRST framework. We show that in the unitary gauge $A_0 = 0$ the BRST procedure has difficulties which can be solved by introduction of additional singlet ghost variables. In the Lorenz gauge $\dot{A}_0 = 0$ one has additional unphysical degrees of freedom, but the BRST quantization is free of the problems in the unitary gauge.Comment: 17 page

Higher dimensional VSI spacetimes

We present the explicit metric forms for higher dimensional vanishing scalar invariant (VSI) Lorentzian spacetimes. We note that all of the VSI spacetimes belong to the higher dimensional Kundt class. We determine all of the VSI spacetimes which admit a covariantly constant null vector, and we note that in general in higher dimensions these spacetimes are of Ricci type III and Weyl type III. The Ricci type N subclass is related to the chiral null models and includes the relativistic gyratons and the higher dimensional pp-wave spacetimes. The spacetimes under investigation are of particular interest since they are solutions of supergravity or superstring theory.Comment: 14 pages, changes in second paragraph of the discussio

Extracting the top-quark running mass using ttˉt\bar{t}+1-jet events produced at the Large Hadron Collider

We present the calculation of the next-to-leading order QCD corrections for top-quark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the top-quark mass. The results are compared to measurements at the Large Hadron Collider run I. In particular, we determine the top-quark running mass from a fit of the theoretical results presented here to the LHC data

Charged particle production in the fragmentation of quark and gluon jets

Recent results on the total production and angular distribution of charged particles originated from the fragmentation of quark and gluon jets are presented. Experimental studies of the multiplicity as a function of the quark and gluon jet energy, the inter-jet particle flow and the individual fragmentation fucntions are reviewed and compared to expectations from QCD

Clonal hematopoiesis and atherosclerotic cardiovascular disease: A primer.

Despite current standards of care, a considerable risk of atherosclerotic cardiovascular disease remains in both primary and secondary prevention. In this setting, clonal hematopoiesis driven by somatic mutations has recently emerged as a relatively common, potent and independent risk factor for atherosclerotic cardiovascular disease and other cardiovascular conditions. Experimental studies in mice suggest that mutations in TET2 and JAK2, which are among the most common in clonal hematopoiesis, increase inflammation and are causally connected to accelerated atherosclerosis development, which may explain the link between clonal hematopoiesis and increased cardiovascular risk. In this review, we provide an overview of our current understanding of this emerging cardiovascular risk factor.S

New modelling technique for aperiodic-sampling linear systems

A general input-output modelling technique for aperiodic-sampling linear systems has been developed. The procedure describes the dynamics of the system and includes the sequence of sampling periods among the variables to be handled. Some restrictive conditions on the sampling sequence are imposed in order to guarantee the validity of the model. The particularization to the periodic case represents an alternative to the classic methods of discretization of continuous systems without using the Z-transform. This kind of representation can be used largely for identification and control purposes.Comment: 19 pages, 0 figure

High precision fundamental constants at the TeV scale

This report summarizes the proceedings of the 2014 Mainz Institute for Theoretical Physics (MITP) scientific program on "High precision fundamental constants at the TeV scale". The two outstanding parameters in the Standard Model dealt with during the MITP scientific program are the strong coupling constant $\alpha_s$ and the top-quark mass $m_t$. Lacking knowledge on the value of those fundamental constants is often the limiting factor in the accuracy of theoretical predictions. The current status on $\alpha_s$ and $m_t$ has been reviewed and directions for future research have been identified.Comment: 57 pages, 24 figures, pdflate

Ganglion intraneural del nervio cubital: presentación de un caso

Se presenta un caso de un Tumor del Nervio Cubital que suele conocerse en la literatura como Ganglion Intraneural o Quiste mucoide de los nervios, y que es capaz de producir parálisis sensitiva y nerviosa. Se intenta diferenciarlos de los Gangliones sinoviales a través de un estudio de la bibliografía de todas las épocas, considerándose que se trata de degeneraciones del tejido conjuntivo nervioso que conducen a la metaplasia del tejido de sostén endo y perineural con vacuolización de los fibroblastos y producción de sustancia mucoide. En la revisión bibliográfica realizada no se encuentran más de una decena de casos con localización en el miembro superior y en el nervio cubital. Se esbozan los criterios de diagnóstico diferencial con otras minoraciones y lesiones de los nervios y se indica como tratamiento recomendable la exéresis quirúrgica.A case of Ganglion Mucoid Cyst of the Ulnar Nerve producing combined motor and sensory deficit is reported. Inthe bibliographic study is possible to do the differential diagnosis between this specific tumor and the common Ganglia of the tendon sheath. Its origine may be the neural conjuntive tissue degeneration whit subsecuent endo and perineural tissue metaplasia, fibroblastic cyst and production of mucoide substance. There are not more than ten similar cases published in the literature. Its diferential diagnosis and recomended treatment is presented