NA62 is a fixed-target experiment at the CERN SPS dedicated to measurements of rare kaon decays. Such measurements, like the branching fraction of the K+ → π+ ν ν̄ decay, have the potential to bring significant insights into new physics processes when comparison is made with precise theoretical predictions. For this purpose, innovative techniques have been developed, in particular, in the domain of low-mass tracking devices. Detector construction spanned several years from 2009 to 2014. The collaboration started detector commissioning in 2014 and will collect data until the end of 2018. The beam line and detector components are described together with their early performance obtained from 2014 and 2015 data.

The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(epsilon'/epsilon) and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described

This report describes the present status of the detector design for SuperB. It is one of four separate progress reports that, taken collectively, describe progress made on the SuperB Project since the publication of the SuperB Conceptual

The integrated low-level trigger and data acquisition (TDAQ) system of the NA62 experiment at CERN is described. The requirements of a large and fast data reduction in a high-rate environment for a medium-scale, distributed ensemble of many different sub-detectors led to the concept of a fully digital integrated system with good scaling capabilities. The NA62 TDAQ system is rather unique in allowing full flexibility on this scale, allowing in principle any information available from the detector to be used for triggering. The design concept, implementation and performances from the first years of running are illustrated.high precision [2], quite unusual for hadronic decays, and therefore represents a very powerful probe of possible New Physics. Moreover, in case a discrepancy with the SM prediction is measured, the "theoretically clean" predictions of such flavour-changing neutral current decay BR would also allow to discriminate among different classes of SM extensions. The downside is that the expected branching ratio is exceedingly small, of order 10 −10 , and the only existing measurement [3] is based on 7 candidate events, thus lacking any real discriminating power due to its limited precision. The NA62 experiment, which aims to make a 10% measurement of the K + → π + νν BR using a novel high-energy decay-inflight approach, just concluded its first data taking pe-

No abstract