H. Stoeck’s research while affiliated with The University of Sydney and other places

We have studied the Cabibbo-suppressed decay mode D-0 -> K+K-pi(0) using a Dalitz plot technique and find the strong phase difference delta(D)equivalent to delta K-*-(K)+-delta K-*+(K)-=332 degrees +/- 8 degrees +/- 11 degrees and relative amplitude r(D)equivalent to a(K)(*-)K(+)/a(K)(*+)K(-)=0.52 +/- 0.05 +/- 0.04. This measurement indicates significant destructive interference between D-0 -> K+(K-pi(0))(K)(*-) and D-0 -> K-(K+pi(0))(K)(*+) in the Dalitz plot region where these two modes overlap. This analysis uses 9.0 fb(-1) of data collected at root s approximate to 10.58 GeV with the CLEO III detector.

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C. Please note that version 3 on the archive is the auxiliary version of the Physics of the B Factories book. This uses the notation alpha, beta, gamma for the angles of the Unitarity Triangle. The nominal version uses the notation phi_1, phi_2 and phi_3. Please cite this work as Eur. Phys. J. C74 (2014) 3026.

We analyze 13.8 fb(-1) of the integrated e(+)e(-) luminosity collected at 10.6 GeV center-of-mass energy with the CLEO II and CLEO II.V detectors to study exclusive two-photon production of hadrons with masses below 1.7 GeV/c(2) decaying into the K(S)(0)K(+/-)pi(-/+) final state. We observe two statistically significant enhancements in the eta(1475) mass region. These enhancements have large transverse momentum which rules them out as being due to pseudoscalar resonances but is consistent with the production of axial-vector mesons. We use tagged two-photon events to study the properties of the observed enhancements and associate them with the production of f(1)(1285) and f(1)(1420). Our nonobservation of eta(1475) is inconsistent by more than 2 standard deviations with the first observation of this resonance in two-photon collisions by the L3 experiment. We present our estimates for 90% confidence level upper limits on the products of two-photon partial widths of light pseudoscalar hadrons and their branching fractions into K-S(0)(pi(+)pi(-))K(+/-)pi(-/+).

Using data acquired with the CLEO detector at the CESR e(+)e(-) collider at root s=3.773 GeV, we measure the cross section for the radiative return process e(+)e(-)->gamma J/psi, J/psi ->mu(+)mu(-), resulting in B(J/psi ->mu(+)mu(-))x Gamma(ee)(J/psi)=0.3384 +/- 0.0058 +/- 0.0071 keV, Gamma(ee)(J/psi)=5.68 +/- 0.11 +/- 0.13 keV, and Gamma(tot)(J/psi)=95.5 +/- 2.4 +/- 2.4 keV, in which the errors are statistical and systematic, respectively. We also determine the ratio Gamma(ee)[psi(2S)]/Gamma(ee)(J/psi)=0.45 +/- 0.01 +/- 0.02.

Data on p̄p → ηπ0π0π0 taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for two I = 0 JPC = 2-+ resonances in ηππ. The first, at 1645 ± 14(stat.) ± 15 (syst.) MeV with width 180 +40-21 ± 25 MeV, decays to a2(1320)π with L = 0. It may be interpreted as the qq̄ 1D2 partner of π2(1670). A strong signal is also observed just above threshold in f2(1270)η with L = 0. It is 11-22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2-+ resonance at 1875 ± 20 ± 35 MeV with width 200 ± 25 ± 45 MeV. A third resonance having JPC = 2++ is observed at 2135 ± 20 ± 45 MeV with Γ = 250±25±45 MeV, decaying to both a2(1320)π and f2(1270)η with L = 1. There is no evidence for resonances with decays to a0(980)π, Qη or f0(980)η.

DOI:https://doi.org/10.1103/PhysRevLett.104.159901

163 pages, 91 figures - See paper for full list of authors

Internal report | Preprint

The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 1034 cm−2 s−1 (1027 cm−2 s−1). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4π solid angle. Forward sampling calorimeters extend the pseudorapidity coverage to high values (|η| ≤ 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.

We report on a search for the lepton flavor violating τ→μγ and τ→eγ decays based on 535 fb-1 of data accumulated at the Belle experiment. No signal is found and we set 90% confidence level upper limits on the branching ratios B(τ→μγ)<4.5×10 and B(τ→eγ)<1.2×10.