We review genetic programming principles, their application to FOCUS data samples , and use the method to study the doubly Cabibbo suppressed decay D + → K + π + π − relative to its Cabibbo favored counterpart, D + → K − π + π +. We find that this technique is able to improve upon more traditional analysis methods. To our knowledge, this is the first… (More)
We describe a silicon microstrip detector interleaved with segments of a beryllium oxide target which was used in the FOCUS photoproduction experiment at Fermi-lab. The detector was designed to improve the vertex resolution and to enhance the reconstruction efficiency of short-lived charm particles.
The Resistive Plate Chambers (RPC) detector of the CMS experiment at the LHC proton collider (CERN, Switzerland) will employ an online gas analysis and monitoring system of the freon-based gas mixture used. We give an overview of the CMS RPC gas system, describe the project parameters and first results on gas-chromatograph analysis. Finally, we report on… (More)
Study of the decay asymmetry parameter and CP violation parameter in the Λ + c → Λπ + decay. Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the weak decay-asymmetry parameter α Λc in Λ + c → Λπ + decay. Comparing particle with antiparticle decays, we obtain the first measurement of the CP violation parameter A ≡
We describe the algorithm used to identify charged tracks in the fixed-target charm-photoproduction experiment FOCUS. We begin by describing the new algorithm and contrast this approach with that used in our preceding experiment—E687. We next illustrate the algorithm's performance using physics signals. Finally we briefly describe some of the methods used… (More)
A high statistics measurement of the D(s)+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, D(s)+ --> phi(1020)pi+ and D(s)+ -->K*(892)0K+, used for the measurement. The measured lifetime is 507.4 +/- 5.5(stat) +/- 5.1(syst) fs using 8961 +/- 105 D(s)+ --> phi(1020)pi+… (More)