A study of charm hadron production in ${\rm Z} \rightarrow c\bar{c}$ and ${\rm Z} \rightarrow b\bar{b}$ decays at LEP

Al, Gimmel'farb

doi:10.1007/s002880050218

Cited by 46 publications

(131 citation statements)

References 6 publications

(22 reference statements)

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“…5.6(c) and (f), i.e., λ 2-jet − λ 3-jet and R 2-jet − R 3-jet , we find λ to be slightly smaller in 3-jet than in 2-jet events, while R is slightly bigger in 3-jet than in 2-jet events. Similar behavior has been previously observed by OPAL [75] and DELPHI [23].…”

Section: Comparison Of λ λ λ and R R R In 2-and 3-jet Eventssupporting

confidence: 75%

“…With a simple Gaussian parametrization and using pairs of unlike-charged particles as a reference sample, OPAL [75] found an R value approximately 6-10% larger for three-jet events than for two-jet events, for all multiplicities. Considering the large uncertainties due to the use of parametrization and reference sample, we do not consider this a significant difference to our result.…”

Section: Multiplicity Dependence Of λ λ λ and R R R In 2-and 3-jet Evmentioning

confidence: 99%

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Inter-string Bose-Einstein Correlations in Hadronic Z Decays using the L3 Detector at LEP

Wang¹

2006

AIP Conference Proceedings

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Section: Comparison Of λ λ λ and R R R In 2-and 3-jet Eventssupporting

confidence: 75%

Section: Multiplicity Dependence Of λ λ λ and R R R In 2-and 3-jet Evmentioning

confidence: 99%

Inter-string Bose-Einstein Correlations in Hadronic Z Decays using the L3 Detector at LEP

Wang¹

2006

AIP Conference Proceedings

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“…Calorimeter clusters having energy greater than 0.1 GeV are used to determine the event thrust [35] axis and to classify events as two-or three-jet events, which are analyzed separately, since differences in the space-time structure (and hence in the BEC parameters) could be expected, and indeed have been observed [26,36].…”

Section: Datamentioning

confidence: 99%

Test of the τ-model of Bose–Einstein correlations and reconstruction of the source function in hadronic Z-boson decay at LEP

Achard¹,

Adriani²,

Aguilar-Benı́tez³

et al. 2011

Eur. Phys. J. C

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Bose-Einstein correlations of pairs of identical charged pions produced in hadronic Z decays are analyzed in terms of various parametrizations. A good description is achieved using a Lévy stable distribution in conjunction with a model where a particle's momentum is correlated with its space-time point of production, the τ -model. Using this description and the measured rapidity and transverse momentum distributions, the space-time evolution of particle emission in two-jet events is reconstructed. However, the elongation of the particle emission region previously observed is not accommodated in the τ -model, and this is investigated using an ad hoc modification.

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“…For example, in a recent OPAL analysis of τ polarization [53], a large sample of 25000 τ → e events was studied. By fitting the e momentum distribution as described above, an upper bound on B(τ → lf ) at the 2 × 10 −3 level could be derived.…”

mentioning

confidence: 99%

Third generation familons,Bfactories, and neutrino cosmology

et al. 1998

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We study the physics of spontaneously broken family symmetries acting on the third generation. Massless familons (or Majorons) f associated with such broken symmetries are motivated especially by cosmological scenarios with decaying tau neutrinos. We first note that, in marked contrast with the case for the first two generations, constraints on third generation familon couplings are poor, and are, in fact, non-existent at present in the hadronic sector. We derive new bounds from B 0 -B 0 mixing, B 0 → l + l ′− , b → sνν, and astrophysics. The resulting constraints on familon decay constants are still much weaker than those for the first and second generation. We then discuss the promising prospects for significant improvements from searches for τ → lf , B → (π, K)f , and b → (d, s)f with the current CLEO, ARGUS, and LEP data. Finally, we note that future constraints from CLEO III and the B factories will probe decay constants beyond 10 8 GeV, well within regions of parameter space favored by proposed scenarios in neutrino cosmology.

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A study of charm hadron production in ${\rm Z} \rightarrow c\bar{c}$ and ${\rm Z} \rightarrow b\bar{b}$ decays at LEP

Abstract: Measurements of the production of the weakly decaying charmed hadrons: D 0 , D + , D + s and + c in both Z 0 ! c c and Z 0 ! b b events are reported. By summing the partial contributions from each of these states we measure the partial width for Z 0 decays into a c c pair as:

Cited by 46 publications

References 6 publications

Inter-string Bose-Einstein Correlations in Hadronic Z Decays using the L3 Detector at LEP

Inter-string Bose-Einstein Correlations in Hadronic Z Decays using the L3 Detector at LEP

Test of the τ-model of Bose–Einstein correlations and reconstruction of the source function in hadronic Z-boson decay at LEP

Third generation familons,Bfactories, and neutrino cosmology

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