| 1. |
- Abreu, P., et al.
(författare)
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Measurement of the gluon fragmentation function and a comparison of the scaling violation in gluon and quark jets
- 2000
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Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 13:4, s. 573-589
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Tidskriftsartikel (refereegranskat)abstract
- The fragmentation functions of quarks and gluons are measured in various three-jet topologies in Z decays from the full data set collected with the DELPHI detector at the Z resonance between 1992 and 995. The results at different values of transverse momentum-like scales are compared. A parameterization of the quark and gluon fragmentation functions at a fixed reference scale is given. The quark and gluon fragmentation functions show the predicted pattern of scaling violations. The scaling violation for quark jets as a function of a transverse momentum-like scale is in a good agreement with that observed in lower energy e+e- annihilation experiments. For gluon jets it appears to be significantly stronger. The scale dependences of the gluon and quark fragmentation functions agree with the prediction of the DGLAP evolution equations from which the colour factor ratio CA/CF is measured to be: CA/CF = 2.26 ± 0.09stat. ± 0.06sys. ± 0.12clus.,scale..
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| 2. |
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| 3. |
- Abreau, P, et al.
(författare)
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Photon events with missing energy at root s=183 to 189 GeV
- 2000
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 17:1, s. 53-65
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Tidskriftsartikel (refereegranskat)abstract
- The production of single photons has been studied in the reaction e(+)e(-) --> gamma +invisible particles at centre-of-mass energies of 183 GeV and 189 GeV. A previously published analysis of events with multiphoton final states accompanied by missing ene
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| 4. |
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| 5. |
- Abreu, P, et al.
(författare)
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A precise measurement of the tau polarisation at LEP-1
- 2000
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 14:4, s. 585-611
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Tidskriftsartikel (refereegranskat)abstract
- The tau polarisation has been studied with the e(+)e(-) --> tau(+)tau(-) data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels ev (v) over bar, mu v (v) over bar, pi v, rho
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| 6. |
- Abreu, P, et al.
(författare)
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A study of the Lorentz structure in tau decays
- 2000
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 16:2, s. 229-252
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes a measurement of the Michel parameters, eta, rho, xi, xi delta, and the average v(tau) helicity, h(nu tau), in tau lepton decays together with the first measurement of the tensor coupling in the weak charged current. The tau(+)tau(-)
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| 7. |
- Abreu, P, et al.
(författare)
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Consistent measurements of alpha(s) from precise oriented event shape distributions
- 2000
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 14:4, s. 557-584
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Tidskriftsartikel (refereegranskat)abstract
- An updated analysis using about 1.5 million events recorded at root s = M-Z with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured as a function of the polar angle of the thrust. axis. The
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| 8. |
- Abreu, P, et al.
(författare)
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Determination of P(c -> D*(+)) and BR(c -> l(+)) at LEP 1
- 2000
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 12:2, s. 209-224
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Tidskriftsartikel (refereegranskat)abstract
- The probability P(c --> D*(+)) that a charm quark fragments into a D*+ meson and the c --> l(+) semileptonic branching fraction were measured in Z(0) decay into c (c) over bar events. From the analysis of 3.5 Million Z(0) events collected from 1992 to 199
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| 9. |
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| 10. |
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