A precise measurement of the 
                $\tau$
               polarisation at LEP-1

al., P. Abreu et

doi:10.1007/s100520000363

Cited by 19 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are in perfect agreement with what the Particle Data Group currently quotes as the world average, α (5) s (M Z ) = 0.1181 ± 0.002 [17]. Our strategy was to only include in our fits LEP1 and SLC data with both flavour separation and hadron identification [8][9][10], gluon-tagged three-jet samples with a fixed gluon-jet energy [11,12] and the π ± , K ± and p/ p datasets from the pre-LEP1/SLC era with the highest statistics and the finest binning in x [15]. Other data served us for cross checks.…”

Section: Introductionsupporting

confidence: 66%

“…Most of the χ 2 DF values lie around unity or below, indicating that the fitted FFs describe all datasets within their respective errors. In general, the χ 2 DF values come out slightly in favour of the DELPHI [9] data. The overall goodness of the NLO (LO) fit is given by χ 2 DF = 0.98 (0.97).…”

Section: Determination Of the Ffsmentioning

confidence: 75%

“…During the last five years, the experiments at LEP1 and SLAC SLC have provided us with a wealth of high-precision information on how partons fragment into low-mass charged hadrons, so as to cure this problem. The data partly come as light-, c-and b-quark-enriched samples without [5][6][7] or with identified final-state hadrons (π ± , K ± and p/ p) [8][9][10] or as gluon-tagged three-jet samples without hadron identification [11][12][13]. Motivated by this new situation, the author, together with Kramer and Pötter, recently updated, refined and extended the BKK [4] analysis by generating new LO and NLO sets of π ± , K ± and p/ p FFs [14] 1 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical aspects of inclusive light-hadron production

Kniehl¹

2002

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

We summarize the key results of a recent global analysis of inclusive singlecharged-hadron production in high-energy colliding-beam experiments. In the framework of the parton model of quantum chromodynamics at next-to-leading order (NLO), fragmentation functions (FFs) for charged pions, charged kaons, and (anti) protons are extracted from experimental data of e + e − annihilation at the Z-boson resonance and at centre-of-mass energy √ s = 29 GeV. This fit also yields a new NLO value for the strong-coupling constant, namely α (5) s (M Z ) = 0.1170 ± 0.0073. The scaling violations encoded in the FFs through the Altarelli-Parisi evolution equations are tested by confronting e + e − -annihilation data from DESY DORIS, DESY PETRA, and CERN LEP2 with NLO predictions based on these FFs. Comparisons of pp data from CERN SppS and the Fermilab Tevatron, γp data from DESY HERA, and γγ data from LEP2 with the corresponding NLO predictions allow us to test the universality of the FFs predicted by the factorization theorem.

show abstract

Section: Introductionsupporting

confidence: 66%

Section: Determination Of the Ffsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical aspects of inclusive light-hadron production

Kniehl¹

2002

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

show abstract

“…All LEP experiments have analysed the most important τ decay modes with high branching fractions [50][51][52][53]: τ → πν, Figure 7 shows the τ polarization measured as a function of cos θ τ − by the individual experiments. Based on equation (92) values of A τ and A e have been derived by each experiment and then combined [32,[50][51][52][53]. Taking into account the systematic uncertainties from QED radiative corrections and extrapolations to the Z pole, and branching fractions from hadronic τ decay models, the combined LEP results for A e and A τ are…”

Section: Tau Polarization At Lepmentioning

confidence: 99%

Precision electroweak physics at high energies

Riemann¹

2010

Rep. Prog. Phys.

View full text Add to dashboard Cite

The era of precision electroweak measurements at high energies started twenty years ago with the electron-positron colliders LEP and SLC. Excellent performance of accelerators, advanced detectors and precise theoretical predictions led to enormous progress in the examination of the Standard Model. Ongoing measurements at the Tevatron complement the precision results from LEP and SLC and allow a comprehensive test of the electroweak interactions. So far, the Standard Model has agreed well with the measurements and no significant deviation has been observed. But the Higgs boson, an important constituent of the Standard Model, has not yet been found but its mass is constrained by the high precision data. In this report an overview of the global electroweak tests of the Standard Model is presented. It includes the measurements, and their treatment to probe the Standard Model with highest precision. Finally, a short outlook to physics scenarios beyond the Standard Model is given. 5. Precision measurements at the Z resonance 13 5.1. Measurement of the Z lineshape 13 5.2. Measurement of forward-backward charge asymmetries 13 5.3. The parameters of the Z lineshape 14 5.4. Tau polarization at LEP 14 5.5. Polarized asymmetries at SLC 15 5.6. Heavy quark flavours at LEP and SLC 16 5.7. Inclusive hadronic charge asymmetry 17 6. Parameters of the Z boson 18 6.1. The Z boson mass 18 6.2. The Z boson partial widths 18 6.3. The number of light neutrinos 18 6.4. Effective couplings of the neutral weak current 19 6.5. The effective weak mixing angle 20 6.6. Sensitivity to radiative corrections beyond QED 20 7. Global test of the Standard Model 21 7.1. Hadronic vacuum polarization 21 7.2. Fit to Z pole data 22 7.3. W boson production at LEP-II 23 7.4. W boson measurements at the Tevatron 24 7.5. World average of W boson mass measurement 25 7.6. Top quark production at the Tevatron 25 7.7. Constraints from measurements at low energies 26 7.8. Global electroweak fit 27 7.9. Global fit and the mass of the Higgs boson 29 Rep. Prog. Phys. 73 (2010) 126201 S Riemann 7.10. Future precision measurements at the Z pole 29 7.11. Parametrization of radiative corrections 31 8. e + e − annihilation at energies above the Z boson 32 8.1. Fermion-pair production above the Z pole 32 8.2. Interpretation of LEP-II fermion-pair production measurements 32 9. Beyond the Standard Model 33 9.1. Supersymmetry 34 9.2. Models with extra dimensions 34 9.3. Strong electroweak symmetry breaking 35 9.4. New gauge bosons 36 10. Summary and outlook 37 Acknowledgments 37 References 37 √ 2and sin θ W is the weak mixing angle. The couplings of the bosons γ , Z and W ± to leftand right-handed fermions are described by electromagnetic currents, J µ em , neutral weak currents, J µ NC , and charged weak currents, J µ CC ,conserves the fermion flavour and includes a vector coefficient, v f = T f 3 − 2Q f sin 2 θ W , and an axial-vector coefficient, a f = T f 3 . The charged current has the general form J µ CC = fν

show abstract

“…Since they cannot be fully predicted from first principles, their extraction need to consider theoretical and experimental inputs. From the experimental community, different experiments can provide the data for different mesons coming from Semi-Inclusive Deep Inelastic Scattering (SIDIS) [14][15][16] and hadron-hadron collisions [17][18][19][20][21][22][23], in the case of PDFs, and it is important to include Single-Inclusive Annihilation (SIA) [24][25][26][27][28][29][30][31][32][33] results for a global QCD analysis of the FFs. On the other side, theoretical predictions at LO, NLO [34][35][36][37][38][39][40] are available, and efforts in order to include up to NNLO corrections [41][42][43] are under investigation.…”

Section: Introductionmentioning

confidence: 99%