Measurement of the very rare K+→π+ννˉK^+ \to \pi^+ \nu \bar\nu decay

The decay K+→π+νν¯ , with a very precisely predicted branching ratio of less than 10−10 , is among the best processes to reveal indirect effects of new physics. The NA62 experiment at CERN SPS is designed to study the K+→π+νν¯ decay and to measure its branching ratio using a decay-in-flight technique. NA62 took data in 2016, 2017 and 2018, reaching the sensitivity of the Standard Model for the K+→π+νν¯ decay by the analysis of the 2016 and 2017 data, and providing the most precise measurement of the branching ratio to date by the analysis of the 2018 data. This measurement is also used to set limits on BR(K+→π+X ), where X is a scalar or pseudo-scalar particle. The final result of the BR(K+→π+νν¯ ) measurement and its interpretation in terms of the K+→π+X decay from the analysis of the full 2016-2018 data set is presented, and future plans and prospects are reviewed

Rare Decays

Introduction Rare decays have played a key role in the development of the standard model. The decay ß + ! e + , which is helicity-suppressed to the level of 10 \Gamma4 , provided a confirmation of the V--A nature of the weak interaction. 1 It is now studied in terms of e-¯ universality in weak interactions at a level of 0.2 %. 2 CP violation was observed 3 by the decay mode K 0 L ! ß + ß \Gamma at the level of 10 \Gamma3 . This mode in conjunction with similar modes is being studied by several groups 4 at a precision level of 10 \Gamma4 ; the double ratio of K 0 L and K 0 S decays to charged and n

Progressive plasterer’s pneumoconiosis complicated by fibrotic interstitial pneumonia: a case report

Abstract Background Although the prevalence of pneumoconiosis has been decreasing due to improvements in working conditions and regular health examinations, occupational hygiene measures are still being established. Plasterers encounter a number of hazardous materials that may be inhaled in the absence of sufficient protection. Case presentation A 64-year-old man who plastered without any dust protection for more than 40 years was referred to our hospital with suspected interstitial pneumonia. Mixed dust pneumoconiosis and an unusual interstitial pneumonia (UIP) pattern with fibroblastic foci were diagnosed by video-assisted thoracoscopic surgery, and an elemental analysis detected elements included in plaster work materials. Despite the cessation of plaster work and administration of nintedanib, the patient developed advanced respiratory failure. Conclusion Plasterers are at an increased risk of pneumoconiosis and may have a poor prognosis when complicated by the UIP pattern. Thorough dust protection and careful monitoring are needed