11635873
Measurement of the branching fractions of the tau lepton using a tagged sample of tau decays.
The branching fractions for the major decay modes of the lepton are measured from a sample of tagged decays selected from +- pairs produced in e+e- annihilation. The decay products of one member of the +- pair are used to identify the event. The opposite member of the pair is then included in the sample if it satisfies an invariant-mass cut and a charged-multiplicity cut. In this way, we attempt to select an unbiased sample of decays. The sample is divided into categories based on charged- and neutral-particle multiplicities, and charged-particle identification. The branching fractions are measured simultaneously, with an unfold technique and a maximum-likelihood fit, with the sum of the branching fractions constrained to be unity. The branching fractions for the decay modes - K- and - K*- are fixed at the world averages in the fit. The following branching fractions are measured: B(-e) =(19.10.81.1)%, B(-' - )=(18.30.90.8)%, B(-) =(10.01.1 *1,4)%, B(-0) =(25.81.72.5)%, B(-(n0, n>1))=(12.01.42.5)%, B(-+-) =(6.7 0.80.9)%, and B(-+- (n0,n>0)) =(6.10.80.9)%. The total branching fraction to one charged pion plus at least one neutral hadron is measured to be (37.81.21.0)%. Limits on allowed decay modes involving the meson are discussed. © 1987 The American Physical Society.
18192511
Measurement of the W boson mass.
We present a measurement of the W boson mass in W-->e(nu) decays using 1 fb-1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider. With a sample of 499830 W-->e(nu) candidate events, we measure M(W)=80.401+/-0.043 GeV. This is the most precise measurement from a single experiment.
23375265
Observation of psi production in e+e- annihilation at 29 GeV.
Inclusive 8-production in e+e-annihilation at 29 GeV has been measured-with the Mark II detector. From an integrated luminosity of 207 pb-', we ~ determine a production rate of 0.017 & 0.004 f 0.004 E:-+ 8-per hadronic event.
208854583
Extraction of the width of the $W$ boson from measurements of $\sigma(p\bar{p} \to W + X) \times B(W \to e \nu)$ and $\sigma(p\bar{p} \to Z + X) \times B(Z \to e e)$ and their ratio
120042323
Performance of the scintillating fibre detector in the upgraded UA2 detector
A large scintillating fibre detector consisting of ≈ 60 000 scintillating plastic fibres of 1 mm diameter and 2.4 m length has been used successfully as a tracking and preshower detector in the UA2 experiment at CERN. The detector readout, the pattern recognition algorithm and the results from the pp data taking run are described.
209834639
Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV
Results are presented from a search for physics beyond the standard model based on events with large missing transverse energy, at least three jets, and at least one, two, or three b-quark jets. The study is performed using a sample of proton-proton collision data collected at sqrt(s)=7 TeV with the CMS detector at the LHC in 2011, with the missing transverse energy distribution as the principal search variable. The integrated luminosity of the sample is 4.98 inverse femtobarns. The observed number of events is found to be consistent with the standard model expectation, which is evaluated using control samples in the data. The results are used to constrain cross sections for the production of supersymmetric particles decaying to b-quark-enriched final states in the context of simplified model spectra.
125080485
New Measurement of the Charged Kaon Semileptonic $K^\pm \to \pi^ \pi^- E^\pm\nu$ ($K_E4$) Decay Branching Ratio and Hadronic Form Factors
120471875
High precision study of CP-violating charge asymmetry in K+- ---> 3pi+- decays by the NA-48/2 experiment at CERN
120890394
High precision search for direct CP-violation in K+- ---> pi+- pi0 pi0 decays by the NA-48/2 experiment at CERN