Determination of the number of J/ψ events with inclusive J/ψ decays

A measurement of the number of J/ψ events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the J/ψ. The number of J/ψ events taken in 2009 is recalculated to be (223.7 ± 1.4) × 106, which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. The number of J/ψ events taken in 2012 is determined to be (1086.9 ± 6.0) × 106. In total, the number of J/ψ events collected with the BESIII detector is measured to be (1310.6 ± 7.0) × 106, where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible

Measurements of the center-of-mass energies at BESIII via the di-muon process

From 2011 to 2014, the BESIII experiment collected about 5 fb-1 data at center-of-mass energies around 4 GeV for the studies of the charmonium-like and higher excited charmonium states. By analyzing the di-muon process e+e- → γISR/FSRμ+μ-, the center-of-mass energies of the data samples are measured with a precision of 0.8 MeV. The center-of-mass energy is found to be stable for most of the time during data taking

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

We report the first measurement of the absolute branching fraction for Λc+→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy s=4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb−1. The branching fraction is determined to be B(Λc+→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%. In addition, we calculate the ratio B(Λc+→Λμ+νμ)/B(Λc+→Λe+νe) to be 0.96±0.16(stat)±0.04(syst)

Charting the development of social and cultural geography in Mainland China: Voices from the inside

This article provides an overview of the recent development of social and cultural geography in China. It discusses six major bodies of work: cultural areas, cultural diffusion and cultural integration; geographies of ethnic cultures; cultural landscape and cultural economy; place and place-based cultural politics; marginal social groups; and geographies of social injustice. Although social and cultural geography is still located on the periphery of the disciplinary landscape of Chinese human geography, it is nonetheless developing into a noteworthy field of research. We start this review by calling attention to some problems in epistemologies and analytical approaches. Social and cultural geography in China often suffers from an analytical separation between environment and culture as ontologically enclosed entities. Also, it pays insufficient attention to the mutually constitutive relations between the social and the spatial. However, more recent studies have begun to engage with constructionist/poststructuralist approaches, and develop less positivist interpretations of space, social relations and cultural meanings. This review suggests that social and cultural geography in China needs to develop broader research scopes and strengthen theoretical frameworks. It concludes by calling for constructive dialogues between Chinese and Western human geographical scholarships. © 2014 © 2014 Taylor & Francis.Link_to_subscribed_fulltex