Test of semi-local duality in a large NCN_C framework

In this paper we test the semi-local duality based on the method of Ref.[1] for calculating final-state interactions at varying number of colors ($N_C$). We compute the amplitudes by dispersion relations that respect analyticity and coupled channel unitarity, as well as accurately describing experiment. The $N_C$ dependence of the $\pi\pi\to\pi\pi$ scattering amplitudes is obtained by comparing these amplitudes to the one of chiral perturbation theory. The semi-local duality is investigated by varying $N_C$. Our results show that the semi-local duality is not violated when $N_C$ is large. At large $N_C$, the contributions of the $f_2(1270)$, the $f_0(980)$ and the $f_0(1370)$ cancel that of the $\rho(770)$ in the finite energy sum rules, while the $f_0(500)$ has almost no effect. This gives further credit to the method developed in Ref.[1] for investigating the $N_C$ dependence of hadron-hadron scattering with final-state interactions. This study is also helpful to understand the structure of the scalar mesons.Comment: 8 pages, 5 figures, several comments are adde

Sex, young people and chlamydia: reducing the impact

Genital chlamydia infection is a highly prevalent condition and disproportionately affects young people. Chlamydia screening is the major strategy for chlamydia control in developed countries. This research includes two separate, linked studies, aiming to reduce the impact of chlamydia in Australian young people by increasing chlamydia testing. The first study is a randomised controlled trial (RCT) and the second a qualitative study using in-depth interviews and discourse analysis. The RCT evaluated an email based intervention and found that those who engaged in email interaction were more likely to report chlamydia test uptake at six month follow up compared with those in the control group. Young people who completed the RCT were invited to participate in face-to-face in-depth interviews, which explored the young person’s experiences of the RCT and enquired about the meanings of STIs they held. Discourse analysis of interview transcripts suggested that young people strongly uphold a medical discourse about STIs and see themselves and others as being responsible if they are safe (ie use condoms or get tested). As digital technologies continue to rapidly evolve, understanding the ways in which young people engage with them in relation to sexual health care will be important

Sex, young people and chlamydia: reducing the impact

Genital chlamydia infection is a highly prevalent condition and disproportionately affects young people. Chlamydia screening is the major strategy for chlamydia control in developed countries. This research includes two separate, linked studies, aiming to reduce the impact of chlamydia in Australian young people by increasing chlamydia testing. The first study is a randomised controlled trial (RCT) and the second a qualitative study using in-depth interviews and discourse analysis. The RCT evaluated an email based intervention and found that those who engaged in email interaction were more likely to report chlamydia test uptake at six month follow up compared with those in the control group. Young people who completed the RCT were invited to participate in face-to-face in-depth interviews, which explored the young person’s experiences of the RCT and enquired about the meanings of STIs they held. Discourse analysis of interview transcripts suggested that young people strongly uphold a medical discourse about STIs and see themselves and others as being responsible if they are safe (ie use condoms or get tested). As digital technologies continue to rapidly evolve, understanding the ways in which young people engage with them in relation to sexual health care will be important

Pole analysis on the hadron spectroscopy of Λb→J/ΨpK−\Lambda_b\to J/\Psi p K^-

In this paper we study the $J/\Psi p$ spectroscopy in the process of $\Lambda_b\to J/\Psi p K^-$. The final state interactions of coupled channel $J/\Psi p$ ~-~ $\bar{D} \Sigma_c$~-~$\bar{D}^{*} \Sigma_c$ are constructed based on K-matrix with the Chew-Mandelstam function. We build the $\Lambda_b\to J/\Psi p K^-$ amplitude according to the Au-Morgan-Pennington method. The event shape is fitted and the decay width of $\Lambda_b\to J/\Psi p K^-$ is used to constrain the parameters, too. With the amplitudes we extract out the poles and their residues. Our amplitude and pole analysis suggest that the $P_c(4312)$ should be $\bar{D}\Sigma_c$ molecule, the $P_c(4440)$ could be an S-wave compact pentaquark state, and the structure around $P_c(4457)$ is caused by the cusp effect. The future experimental measurement of the decays of $\Lambda_b\to \bar{D}\Sigma_c K^-$ and $\Lambda_b\to \bar{D}^*\Sigma_c K^-$ would further help to study the nature of these resonances.Comment: updated to the published versio

Continuous Multipartite Entangled State in Wigner Representation and the Violation of Zukowski-Brukner Inequality

We construct an explicit Wigner function for N-mode squeezed state. Based on a previous observation that the Wigner function describes correlations in the joint measurement of the phase-space displaced parity operator, we investigate the non-locality of multipartite entangled state by the violation of Zukowski-Brukner N-qubit Bell inequality. We find that quantum predictions for such squeezed state violate these inequalities by an amount that grows with the number N.Comment: 5 pages, rewritten version, accepted by Phys. Rev.