We report on tests of a novel ring imaging Cherenkov (RICH) detection system consisting of a 3-m-long gaseous
C
4
F
8
O
radiator, a focusing mirror, and a photon detector array based on Hamamatsu ...multi-anode photomultiplier tubes. This system was developed to identify charged particles in the momentum range from 3 to 70
GeV/c for the BTeV experiment.
We report on recent measurements of hadronic, semileptonic and leptonic $D$
decays taken using ~57 pb^-1 of data collected on the psi'' resonance using the
CLEO-c detector.
We present recent measurements of
B and
B
s
0
production using data collected on the
ϒ
(
5
S
)
resonance at CLEO and Belle. We also briefly discuss what can be learned using sufficiently larger data ...samples in the future.
Journal of High Energy Physics 04 (2019) 063 The resonant structure of the doubly Cabibbo-suppressed decay $D^+ \to
K^-K^+K^+$ is studied for the first time. The measurement is based on a sample
of ...pp-collision data, collected at a centre-of-mass energy of 8 TeV with the
LHCb detector and corresponding to an integrated luminosity of 2 fb$^-1$. The
amplitude analysis of this decay is performed with the isobar model and a
phenomenological model based on an effective chiral Lagrangian. In both models
the S-wave component in the $K^-K^+$ system is dominant, with a small
contribution of the $\phi(1020)$ meson and a negligible contribution from
tensor resonances. The $K^-K^+$ scattering amplitudes for the considered
combinations of spin (0,1) and isospin (0,1) of the two-body system are
obtained from the Dalitz plot fit with the phenomenological decay amplitude.
The Intermediate Silicon Layers (ISL) detector is presently being built as part of CDF upgrades. The ISL is a large radius (28 cm) silicon tracker with a total active area of about 3.5 m
2. The ...challenge is to build a device which provides precise 3D points introducing a minimal amount of material for the supporting structure. The design and the status of the project are described.
The first measurements of the coherence factor R_{K_S^0K\pi} and the average strong--phase difference \delta^{K_S^0K\pi} in D^0 \to K_S^0 K^\mp\pi^\pm decays are reported. These parameters can be ...used to improve the determination of the unitary triangle angle \gamma\ in B^- \rightarrow \(\widetilde{D}K^-\) decays, where \(\widetilde{D}\) is either a D^0 or a D^0-bar meson decaying to the same final state, and also in studies of charm mixing. The measurements of the coherence factor and strong-phase difference are made using quantum-correlated, fully-reconstructed D^0D^0-bar pairs produced in e^+e^- collisions at the \psi(3770) resonance. The measured values are R_{K_S^0K\pi} = 0.70 \pm 0.08 and \delta^{K_S^0K\pi} = (0.1 \pm 15.7)\(^\circ\) for an unrestricted kinematic region and R_{K*K} = 0.94 \pm 0.12 and \delta^{K*K} = (-16.6 \pm 18.4)\(^\circ\) for a region where the combined K_S^0 \pi^\pm invariant mass is within 100 MeV/c^2 of the K^{*}(892)^\pm mass. These results indicate a significant level of coherence in the decay. In addition, isobar models are presented for the two decays, which show the dominance of the K^*(892)^\pm resonance. The branching ratio {B}(D^0 \rightarrow K_S^0K^+\pi^-)/{B}(D^0 \rightarrow K_S^0K^-\pi^+) is determined to be 0.592 \pm 0.044 (stat.) \pm 0.018 (syst.), which is more precise than previous measurements.
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