FLC

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2017-04-19
10:33
[PUBDB-2017-01690] Report/Journal Article
; ; ; et al
Impact of $e^+$ and $e^-$ beam polarization on chargino and neutralino production at a linear collider
[hep-ph/0007222; DESY-00-098; UWTHPH-2000-25; WUE-ITP-2000-016; HEPHY-PUB-731-2000] ddc:530
We study the production processes e^+ e^- -> chi^+_i chi^-_j, i,j=1,2, and e^+ e^- -> chi^0_m chi^0_n, m,n=1,...,4, working out the advantages of polarizing both beams. For e^+ e^- -> chi^+_1 chi^-_1 with chi^-_1 -> chi^0_1 e^- nu and e^+ e^- -> chi^0_1 chi^0_2 with chi^0_2 -> chi^0_1 e^+ e^- we perform a detailed analysis, including the complete spin correlations between production and decay. [...]
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2017-04-10
14:52
[PUBDB-2017-01605] Report/Journal Article
; ; ; et al
Precise determination of the Z resonance parameters at LEP: Zedometry
[hep-ex/0012018; CERN-EP-2000-148; OPAL-PR-328] ddc:530
This final analysis of hadronic and leptonic cross-sections and of leptonic forward-backward asymmetries in e+e- collisions with the OPAL detector makes use of the full LEP1 data sample comprising 161 pb^-1 of integrated luminosity and 4.5 x 10^6 selected Z decays. An interpretation of the data in terms of contributions from pure Z exchange and from Z-gamma interference allows the parameters of the Z resonance to be determined in a model-independent way. [...]
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2017-04-10
14:50
[PUBDB-2017-01604] Report/Journal Article
; ; ; et al
A Study of $B_s$ meson oscillation using $D_s$ - lepton correlations
[hep-ex/0011052; CERN-EP-2000-136; OPAL-PR-327] ddc:530
From data collected around the Z resonance by the OPAL detector at LEP, a sample of Bs decays was obtained using Ds^-l^+ combinations, where the Ds^- was fully reconstructed in the phi pi-, K*0K- and Ks0K- decay channels or partially reconstructed in the phi l- nu (X) decay channel. These events were used to study Bs oscillation. [...]
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2017-04-10
14:26
[PUBDB-2017-01599] Report/Journal Article
; ; ; et al
Investigation of the decay of orbitally excited B mesons and first measurement of the branching ratio BR(B$^*_J\to B^*\pi$(X))
[hep-ex/0010031; CERN-EP-2000-125] ddc:530
From about 4 million hadronic Z decays recorded by the OPAL detector on and near to the Z resonance, we select a sample of more than 570000 inclusively reconstructed B mesons. Orbitally-excited mesons B*J are reconstructed using Bpi+- combinations. [...]
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2017-04-10
14:12
[PUBDB-2017-01594] Report/Journal Article
; ; ; et al
Measurement of triple gauge boson couplings from $W^{+} W^{-}$ production at LEP energies up to 189-GeV
[hep-ex/0009022; CERN-EP-2000-114] ddc:530
A measurement of triple gauge boson couplings is presented, based on W-pair data recorded by the OPAL detector at LEP during 1998 at a centre-of-mass energy of 189 GeV with an integrated luminosity of 183 pb^-1. After combining with our previous measurements at centre-of-mass energies of 161-183 GeV we obtain k_g=0.97 +0.20 -0.16, g_1^z=0.991 +0.060 -0.057 and lambda_g=-0.110 +0.058 -0.055, where the errors include both statistical and systematic uncertainties and each coupling is determined by setting the other two couplings to their SM values. [...]
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2017-04-10
14:08
[PUBDB-2017-01593] Report/Journal Article
; ; ; et al
Measurement of $W$ boson polarizations and CP violating triple gauge couplings from $W^{+} W^{-}$ production at LEP
[hep-ex/0009021; CERN-EP-2000-113] ddc:530
Measurements are presented of the polarisation of W+W- boson pairs produced in e+e- collisions, and of CP-violating WWZ and WWGamma trilinear gauge couplings. The data were recorded by the OPAL experiment at LEP during 1998, where a total integrated luminosity of 183 pb^-1 was obtained at a centre-of-mass energy of 189 GeV. [...]
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2017-04-10
14:06
DBCoverage [PUBDB-2017-01592] Report/Journal Article
; ; ; et al
Measurement of the $B^0$ lifetime and oscillation frequency using $\bar{B}^0 \to D^{*+} \ell^{-}$ anti-neutrino decays
[hep-ex/0010013; CERN-EP-2000-090; CERN-EP-2000-90] ddc:530
The lifetime and oscillation frequency of the B 0 meson has been measured using B ̄ 0 → D ∗+ ℓ − ν ̄ decays recorded on the Z 0 peak with the OPAL detector at LEP. The D ∗+ → D 0 π + decays were reconstructed using an inclusive technique and the production flavour of the B 0 mesons was determined using a combination of tags from the rest of the event. [...]
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2017-04-10
13:58
DBCoverage [PUBDB-2017-01591] Report/Journal Article
; ; ; et al
A Measurement of the rate of charm production in $W$ decays
[hep-ex/0009020; CERN-EP-2000-100] ddc:530
Using data recorded at centre-of-mass energies around 183 and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio R c W ≡Γ ( W → c X )/Γ ( W → hadrons ) has been measured from jet properties, lifetime information, and leptons produced in charm decays. [...]
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2017-04-10
13:53
DBCoverage [PUBDB-2017-01590] Report/Journal Article
; ; ; et al
$W^+W^-$ production cross-section and W branching fractions in $e^+e^-$ collisions at 189-GeV
[hep-ex/0009019; CERN-EP-2000-101] ddc:530
From a data sample of 183 pb −1 recorded at a center-of-mass energy of s =189  GeV with the OPAL detector at LEP, 3068 W-pair candidate events are selected. Assuming Standard Model W boson decay branching fractions, the W-pair production cross section is measured to be σ WW =16.30±0.34(stat.)±0.18(syst.) pb. [...]
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2017-04-10
13:49
DBCoverage [PUBDB-2017-01589] Report/Journal Article
; ; ; et al
Measurement of the mass and width of the $W$ boson in $e^{+} e^{-}$ collisions at 189-GeV
[hep-ex/0009018; CERN-EP-2000-099] ddc:530
The mass and width of the W boson are determined in e + e − collisions at LEP using 183 pb −1 of data recorded at a centre-of-mass energy s =189  GeV with the OPAL detector. The invariant mass distributions from 970 W + W − →qqqq and 1118 W + W − →qqℓ ν ℓ candidate events are used to measure the mass of the W boson, M W =80.451±0.076 (stat.)±0.049 (syst.) GeV. [...]
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