2 nd Brazilian Consensus on Chagas Disease, 2015

Abstract Chagas disease is a neglected chronic condition with a high burden of morbidity and mortality. It has considerable psychological, social, and economic impacts. The disease represents a significant public health issue in Brazil, with different regional patterns. This document presents the evidence that resulted in the Brazilian Consensus on Chagas Disease. The objective was to review and standardize strategies for diagnosis, treatment, prevention, and control of Chagas disease in the country, based on the available scientific evidence. The consensus is based on the articulation and strategic contribution of renowned Brazilian experts with knowledge and experience on various aspects of the disease. It is the result of a close collaboration between the Brazilian Society of Tropical Medicine and the Ministry of Health. It is hoped that this document will strengthen the development of integrated actions against Chagas disease in the country, focusing on epidemiology, management, comprehensive care (including families and communities), communication, information, education, and research

First measurement of the Z→μ+μ− angular coefficients in the forward region of pp collisions at √s = 13 TeV

The first study of the angular distribution of μ + μ − pairs produced in the forward rapidity region via the Drell-Yan reaction p p → γ ∗ / Z + X → ℓ + ℓ − + X is presented, using data collected with the LHCb detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.1     fb − 1 . The coefficients of the five leading terms in the angular distribution are determined as a function of the dimuon transverse momentum and rapidity. The results are compared to various theoretical predictions of the Z -boson production mechanism and can also be used to probe transverse-momentum-dependent parton distributions within the proton

Observation of the Decay Λb0 → Λc+τ−ν¯τ

The first observation of the semileptonic b -baryon decay Λ 0 b → Λ + c τ − ¯ ν τ , with a significance of 6.1 σ , is reported using a data sample corresponding to 3     fb − 1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ − lepton is reconstructed in the hadronic decay to three charged pions. The ratio K = B ( Λ 0 b → Λ + c τ − ¯ ν τ ) / B ( Λ 0 b → Λ + c π − π + π − ) is measured to be 2.46 ± 0.27 ± 0.40 , where the first uncertainty is statistical and the second systematic. The branching fraction B ( Λ 0 b → Λ + c τ − ¯ ν τ ) = ( 1.50 ± 0.16 ± 0.25 ± 0.23 ) % is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ 0 b → Λ + c π − π + π − . The ratio of semileptonic branching fractions R ( Λ + c ) ≡ B ( Λ 0 b → Λ + c τ − ¯ ν τ ) / B ( Λ 0 b → Λ + c μ − ¯ ν μ ) is derived to be 0.242 ± 0.026 ± 0.040 ± 0.059 , where the external branching fraction uncertainty from the channel Λ 0 b → Λ + c μ − ¯ ν μ contributes to the last term. This result is in agreement with the standard model prediction