A study of multi-jet events at the CERN I3p collider and a search for double patton scattering UA2 Collaboration Bern-Cambridge-CERN-Dortmund-Heidelberg-Melbourne-Milano-Orsay (LAL)-Pavia- Perugia-Pisa-Saclay (CEN)

A study of events containing at least four high transverse momentum jets and a search for double parton scattering (DPS) have been performed using data collected with the UA2 detector at the CERN lbp Collider (x/s= 630 GeV). The results are in good agreement with leading order QCD calculations. A value of at~Ps < 0.82 nb at 95% confidence level (CL) is obtained for the DPS cross section

Higher Risk of Cardiovascular Disease Associated with Smaller Size-Fractioned Particulate Matter

No nationwide studies have examined the associations between mortality risk and PM1 (PM with an aerodynamic diameter of <1 μm) due to the scarcity of monitoring data of PM1. On the basis of newly released national scale PM1 data, we performed a time series analysis to elucidate the cause-specific mortality risk caused by PM1 exposure in China. During the period from January 2014 to December 2017, the PM1 levels in 65 cities of China were on average 37 ± 32 μg/m3. Pooled results indicated a 10 μg/m3 increase in the PM1 level was associated with a 0.19% [95% confidence interval (CI) of 0.09–0.28%] increased risk in nonaccidental mortality, which was almost the same as that for PM2.5 (0.18%, 95% CI of 0.08–0.27%) and PM10 (0.17%, 95% CI of 0.01–0.24%). By comparison, the magnitude increased to 0.29% (0.12–0.47%) in cardiovascular disease for each 10 μg/m3 uptick in PM1, which was significantly higher than that related to PM2.5 and PM10 exposure. This nationwide study supported the notion that PM1 may be a higher risk factor for cardiovascular disease, which suggests rapid action is warranted to put more effort into mitigating the emissions of finer particulate matters