Measurement of the mixing parameter in DELPHI

Abstract

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Hadronization in decay

“…The actual level of popcorn production required to describe data is still the subject of debate but it may be related to the a parameter of the LSFF [161]. Interestingly a search for the expected chain like structures, such as correlated ΛK +p systems, has failed to see any positive evidence [162]. Allowing three body decays of clusters is expected to have similar effects to introducing popcorn production in string models.…”

“…However HERWIG does poorly with mesons containing s quarks as well as with baryons. The production of the light tensor mesons is discussed by DELPHI in [188] where a comparison is made of relative rates of tensor to corresponding vector mesons. While the production ratio f 2 /ρ 0 is similar to that for f ′ 2 /φ, at about 20%, there is evidence for a lower K * 2 /K * ratio, in agreement with results from hadroproduction experiments.…”

“…However OPAL [191] measures a larger rate for K * 2 and so the picture is not yet clear. Some evidence has also been reported [188] for a rise in the ratio f 2 /ρ 0 with meson momentum; in other words the fragmentation function of the tensor meson may be harder than that of the vector meson, as generally expected of heavier hadrons [214]. However, these are difficult resonances to measure; they have large widths, large combinatorial backgrounds and uncertainties in the resonance line shapes.…”

“…Only one measurement of a scalar meson, the f 0 (980), has been reported [188], with a ratio f 0 /ρ 0 of 0.14 ± 0.03. Thus if the f 0 is indeed a conventional 0 ++ meson (see [7] for a mini-review of the scalars) then the scalar and tensor mesons are produced with similar rates.…”

CP-violating Zγγ and top-quark electric dipole couplings in

“…There have been detailed discussions on the anomalous triple gauge boson couplings W W V and ZγV , where V = γ, Z, in the literature [1,2,3]. Experimental bounds on these couplings obtained at LEP [4,5,6,7] and at the Tevatron [8,9] are fairly weak, and are found to be consistent with SM. While future experiments would improve these limits, effects of these couplings are expected to be more visible at higher energies, for example, at the proposed linear e + e − colliders.…”