Search for Charginos with a Small Mass Difference with the Lightest Supersymmetric Particle at \sqrt{s} = 189 GeV

A search for charginos nearly mass-degenerate with the lightest supersymmetric particle is performed using the 176 pb^-1 of data collected at 189 GeV in 1998 with the L3 detector. Mass differences between the chargino and the lightest supersymmetric particle below 4 GeV are considered. The presence of a high transverse momentum photon is required to single out the signal from the photon-photon interaction background. No evidence for charginos is found and upper limits on the cross section for chargino pair production are set. For the first time, in the case of heavy scalar leptons, chargino mass limits are obtained for any \tilde{\chi}^{+-}_1 - \tilde{\chi}^0_1 mass difference

Search for Low Scale Gravity Effects in e+e- Collisions at LEP

Recent theories propose that quantum gravity effects may be observable at LEP energies via gravitons that couple to Standard Model particles and propagate into extra spatial dimensions. The associated production of a graviton and a photon is searched for as well as the effects of virtual graviton exchange in the processes: e+e- -> gamma gamma, ZZ, WW, mu mu, tau tau, qq and ee No evidence for this new interaction is found in the data sample collected by the L3 detector at LEP at centre-of-mass energies up to 183 GeV. Limits close to 1 TeV on the scale of this new scenario of quantum gravity are set

Production of Single W Bosons at LEP

We report on the observation of single W boson production in a data sample collected by the L3 detector at LEP2. The signal consists of large missing energy final states with a single energetic lepton or two hadronic jets. The cross-section is measured to be $0.61^{+0.43}_{-0.33} \pm 0.05 \; \rm{pb}$ at the centre of mass energy \sqrt{s}=172 \GeV{}, consistent with the Standard Model expectation. From this measurement the following limits on the anomalous $\gamma$WW gauge couplings are derived at 95\% CL: $\rm -3.6 \Delta \kappa_\gamma 1.5$ and $\rm -3.6 \lambda_\gamma 3.6$

Measurement of the Average Lifetime of b-Hadrons in Z Decays

We present a measurement of the average b-hadron lifetime ${\rm \tau_b}$ at the $\mathrm{e^+e^-} \,$ collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of ${\rm \tau_b}$ using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is \begin{center} ${\rm \tau_b= [ 1549 \pm 9 \, (stat) \, \pm 15 \, (syst) ] \; fs \,}$ . \end{center} In addition, we measure the average charged b-decay multiplicity ${\rm \langle n_{\rm b}} \rangle$ and the normalized average b-energy ${\rm \langle x_E \rangle_{\rm b}}$ at LEP to be \begin{center} ${\rm \langle n_{\rm b} \rangle = 4.90 \pm 0.04 \ (stat) \pm 0.11 \, (syst)}$ , \end{center} \begin{center} ${\rm \langle x_E \rangle_{\rm b} = 0.709 \pm 0.004 \, (stat + syst).}$ \end{center

Evidence for Gluon Interference in Hadronic Z-Decays

Contains fulltext : 26227.pdf (publisher's version ) (Open Access

One-Prong Tau-Decays with Neutral Kaons

Contains fulltext : 26231.pdf (publisher's version ) (Open Access

Principles for supporting school drug education.

Children and young people often find visitors to school a useful and informative part of their learning, but for visits to be successful there needs to be a shared understanding about the nature and content of the sessions. This paper is intended to set out principles that visitors and schools can consider applying to ensure better outcomes from using external support in a school's delivery of drug education

HSE performance report on NSP 2011. June 2011.

The Performance Report (PR) provides an overall analysis of key performance data from Finance, HR, Hospital and Primary & Community Services. The activity data reported is based on Performance Activity and Key Performance Indicators outlined in the NSP 2011. The June Performance Report is the second quarterly update for 2011 and includes additional metrics as outlined in the National Service Plan 2011. The PR is used by the Performance Monitoring & Control committee (PMCC), the CEO and the HSE Board to monitor performance against planned activity, as outlined in the NSP, and to highlight areas for improvement. The PR also provides an update to the DoHC on the delivery of the NSP. A Supplementary Report is also produced each month which provides more detailed data on the metrics covered in the Performance Report. This will be expanded quarterly and biannually to report on progress against the Deliverables outlined in NSP 2011. The Supplementary report contains information on Methadone treatment activity and expenditure