χc0(1P)\chi_{c0}(1P) decay into Σˉ Σπ\bar\Sigma~\Sigma\pi in search of an I=1I=1, 1/2−1/2^- baryon state around KˉN\bar K N threshold

We present the theoretical study of the process $\chi_{c0}(1P)\to\bar\Sigma\Sigma\pi$ decay, by taking into account the $\pi\Sigma$ and $\pi\bar\Sigma$ final state interactions of the final meson-baryon pair based on the chiral unitary approach. We show that the process filters the isospin $I=1$ in the $\pi\Sigma$ channel and offers a reaction to test the existence of an $I=1$ state with strangeness $S=-1$ and spin-parity $J^p=1/2^-$ around the $\bar KN$ threshold predicted by some theories and supported by some experiments.Comment: 8 pages, 8 figures, 1 table, the version for PL

Fatigue strength of shear connectors

Nowadays steel and concrete composite beams are widely applied in structures mainly subjected to dynamic loads, such as railway and road bridges exposed to traffic loads and industrial crane runways exposed to folk-lift truck loads, the fatigue resistance of these structures must be generally and carefully verified. And normally the shear forces between concrete flange and steel beams are all transferred by different kinds of shear connectors, fatigue failure of composite beam may happen on shear connectors. So the fatigue resistance of shear connectors in composite beams is significant for the safe of whole structure and needed to be well investigated. The fatigue strength of shear connectors could be explained in three ways, the fatigue endurance described by the relationships between stress range (S) and number of cycles (N), the static residual strength after a certain number of cycling loading, and the slip behavior during the cycling tests. S-N curves which widely used for steel fatigue assessment are also useful for shear connectors. Although there are already S-N curves for headed steel studs in Eurocodes and AASHTO, they are normally available for common studs. Whether these S-N curves applicable for large diameter studs or studs embedded in high strength concrete or other kind shear connectors is questionable. And the factors influencing fatigue life of shear connectors are needed more research. Furthermore, for the fatigue life assessment of existing structures, it is important to attain the residual strength after a certain service life or the principles of slip developing behavior during the service life. Then it is possible to assess how long the shear connectors could still service

Revisiting the Ω(2012)\Omega(2012) as a hadronic molecule and its strong decays

Recently, the Belle collaboration measured the ratios of the branching fractions of the newly observed $\Omega(2012)$ excited state. They did not observe significant signals for the $\Omega(2012) \to \bar{K} \Xi^*(1530) \to \bar{K} \pi \Xi$ decay, and reported an upper limit for the ratio of the three body decay to the two body decay mode of $\Omega(2012) \to \bar{K} \Xi$. In this work, we revisit the newly observed $\Omega(2012)$ from the molecular perspective where this resonance appears to be a dynamically generated state with spin-parity $3/2^-$ from the coupled channels interactions of the $\bar{K} \Xi^*(1530)$ and $\eta \Omega$ in $s$-wave and $\bar{K} \Xi$ in $d$-wave. With the model parameters for the $d$-wave interaction, we show that the ratio of these decay fractions reported recently by the Belle collaboration can be easily accommodated.Comment: Published version. Published in Eur.\ Phys.\ J.\ C {\bf 80}, 361 (2020

Higher education, high-impact research, and world university rankings: A case of India and comparison with China

AbstractTo date, this paper is probably the first to compare Indian and Chinese universities on educational performance metrics such as high-impact research and world university rankings. The study, therefore, examines the current state of higher education, high-impact research metrics, and world university rankings in an emerging market of India. First, we present an overview of the higher education system, government schemes for academic research, and related educational statistics. Second, we compare India and China on various academic-research metrics (citable documents, number of citations, cites per document, and H-index in three categories), and world university rankings. Special attention is devoted to revealing the progress of management research metrics, business school accreditations and rankings, and abstracting and indexing of publishing journals. Last, we discuss several challenges in university education and recommend policy guidelines pertaining to research funding, collaborative research projects, and research assessment council for imparting quality academic practices and standards in a higher education environment. Our exploratory analysis indicates that for citable documents in the ‘all subjects’ category, the United States is ranked first, followed by China in second, the United Kingdom in third, and India in ninth. Overall, world university rankings and research metrics of Indian universities are found to be far behind those of Chinese universities