LATTES: A new gamma-ray detector concept for South America

In this contribution we discuss the main features and capabilities of a novel hybrid-detector concept for a gamma extensive air-shower array with improved sensitivity towards the lower energies (100GeV). Preliminary results on its expected perfomance and sensitivity are presented. This wide field-of-view experiment is planned to be installed at high altitude in South America making it a complementary project to the planned Cherenkov telescope experiments and a powerful tool to trigger further observations of variable sources and to detect transient phenomena

LATTES: a novel detector concept for a gamma-ray experiment in the Southern hemisphere

The Large Array Telescope for Tracking Energetic Sources (LATTES), is a novel concept for an array of hybrid EAS array detectors, composed of a Resistive Plate Counter array coupled to a Water Cherenkov Detector, planned to cover gamma rays from less than 100 GeV up to 100 TeVs. This experiment, to be installed at high altitude in South America, could cover the existing gap in sensitivity between satellite and ground arrays. The low energy threshold, large duty cycle and wide field of view of LATTES makes it a powerful tool to detect transient phenomena and perform long term observations of variable sources. Moreover, given its characteristics, it would be fully complementary to the planned Cherenkov Telescope Array (CTA) as it would be able to issue alerts. In this talk, a description of its main features and capabilities, as well as results on its expected performance, and sensitivity, will be presented.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC2017), Busan, South Korea. Presented by R. Concei\c{c}\~{a}o. 8 pages; v2: correct affiliation + journal referenc

Cygnus X-3 muon signal in the NUSEX experiment

SIGLEITItal

Surface and underground experiments at the Gran Sasso

SIGLEITItal

Study of jet production in p-N interactions at root s approximate to 500 GeV in EAS multicore events

The cross section for large p(t) jet production for transverse momentum 10 less than or equal to p(t) less than or equal to 20 GeV/c and rapidity 1.6 less than or equal to eta less than or equal to 2.6 in p-N (p-'air') interactions is studied from the analysis of multicore Extensive Air Showers recorded in the EAS-TOP calorimeter. The projectiles are the leading particles interacting at atmospheric depths between 250 and 480 cm(-2), the CMS energy of interaction being root s = 500 GeV. The slope of the p(t) distribution agrees with the expected one from the p-(p) over bar collider data at the same CMS energy. The measured jet production cross section in p-N interactions with respect to p-(p) over bar interactions is (d sigma/dp(t))(pN)(jet) = (d sigma/dp(t))(p (p) over bar)(jet) . A(alpha) with alpha = 1.56 +/- 0.07 for A = 14.7 (average mass number of 'air' nuclei). Such value is compatible within the experimental uncertainties with the one obtained in p-nucleus accelerator measurements at root s similar to 30 GeV in the same range of transverse momentum and rapidity. No indication of increase of alpha with energy, i.e. of the entity of the 'Cronin effect', is found. (C) 1999 Published by Elsevier Science B.V. All rights reserved

Measurement of the Mass of the Z-Boson and the Energy Calibration of Lep

Contains fulltext : 26847___.PDF (publisher's version ) (Open Access

Measurement of tau branching ratios

Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+vτ andτ→hadron+2π0vτ, which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL